Alpine Cloud Climatology Using Long-Term NOAA-AVHRR Satellite Data

Total Page:16

File Type:pdf, Size:1020Kb

Alpine Cloud Climatology Using Long-Term NOAA-AVHRR Satellite Data Institut fur Physik der Atmosphare Report No. 140 Alpine cloud climatology using long-term NOAA-AVHRR satellite data by Martina Kastner and Karl-Theodor Kriebel Diese Berichtsserie des Instituts fur Physik der Atmosphare enthalt Veroffentlichungen, die zu einem spateren Zeitpunkt an anderer Stelle erscheinen sollen, sowie spezielle Einzelergebnisse und erganzende Materialien, die von allgemeinem Interesse sind. This series of reports of the Institute of Atmopsheric Physics comprises preprints of publications, specific results and complementary material, which may be of a more general interest. Herausgeber Ulrich Schumann Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR) Institut fur Physik der Atmosphare Redaktion Ute Lob Anschrift DLR - Oberpfaffenhofen D-82234 Wessling Germany Tele fori +49 - 8153 28 1797 Telefax +49-8153 28 1841 WWW http://www.op.dlr.de/ipa/ E-Mail [email protected] Oberpfaffenhofen Juli 2000 ISSN 0943-4771 DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. DE01G0874 Alpine cloud climatology using long-term NOAA-AVHRR satellite data RECEIVED FEB 0 5 2001 M. Kastner and K.T. Kriebel OSTI DLR, Institut fur Physik der Atmosphere, Ober pfaffenhofen DE014976396 ilillullmll IIJ IHIILII JJi &DE014976396* Abstract Three different climates have been identified by our evaluation of AVHRR (Advanced Very High Resolution Radiometer) data using APOLLO (AVHRR Processing scheme Over Land, cLouds and Ocean) for a five-years cloud climatology of the Alpine region. The cloud cover data from four layers were spatially averaged in boxes of 15 km by 14 km. The study area only comprises 540 km by 560 km, but contains regions with moderate, Alpine and Mediterranean climate. Data from the period July 1989 until December 1996 have been considered. The temporal resolution is one scene per day, the early afternoon pass, yielding monthly means of satellite derived cloud coverages 5% to 10 % above the daily mean compared to conventional surface observation. At non-vegetated sites the cloudiness is sometimes significantly overestimated. Averaging high resolution cloud data seems to be superior to low resolution measurements of cloud properties and averaging is favourable in topographical homogeneous regions only. The annual course of cloud cover reveals typical regional features as foehn or temporal singularities as the so-called Christmas thaw. The cloud cover maps in spatially high resolution show local luff/lee features which outline the orography. Less cloud cover is found over the Alps than over the forelands in winter, an accumulation of thick cirrus is found over the High Alps and an accumulation of thin cirrus north of the Alps. 1 1 Introduction Climate depends essentially on the radiation balance and the water cycle. Both exchange processes are linked by clouds that are involved in dynamical processes, too. Changes of the distribution of clouds might be an expression or indication of a changing climate. Global cloud cover is monitored by the ISCGP (International Satellite Cloud Climatology Project; Schiffer and Rossow, 1983) for many years. '-Results- are provided in the high temporal resolution of 3 hours, well suited to describe the large-scale circulation and its cloud system evolution cycle. However, the spatial resolution is rather coarse being greater than 100 km. But regional changes in cloud cover may change regional climate, too. This different objective requires the observation of smaller cloud systems with high spatial resolution for longer periods. Surface observationseither don’t provide a high spatial resolution data set (e.g. Warren et ah, 1986), or don’t give homogeneous observations (synoptic ground net). Satellite observations can give high spatial resolution together with homogeneous area coverage. Further, such data are derived by consistant methods instead of subjective eye observations. Until now, there have onlybeen few high spatial resolution cloud climatologies published based on satellite data (e.g. Karlsson, 1997). In this paper, a 5-years cloud climatology in a small area, based on AVHRR (Advanced Very High Resolution Radiometer) data, is described and analyzed which has been initialized several years ago. Its purpose is to pave the way for a 15-years regional European Cloud Climatology from 1986 to 2000 which has already been started at the Deutsches Zentrum fur Luft- und Raumfahrt (DLR). The 5-years cloud climatology has been performed in the Alpine region from 1992 to 1996. Although the study area is small it comprises three climate regions: moderate, Alpine, and Mediterranean climate. One objective of this cloud climatology study is to improve the validity of the threshold tests in different climates used in the APOLLO (AVHRR Processing scheme Over cLouds, Land and Oceans) algorithm package (Saunders and Kriebel, 1988; Kriebel et al., 1989; Gesell, 1989). With the improved cloud detection scheme a unique 15-years cloud climatology is envisaged in near future. This paper concentrates on climatological features of high spatial resolution derived from monthly, seasonal, and annual mean data of different types of cloud cover. Results from other cloud products like optical depth, liquid water path, and IR-emissivity which are derived simultaneously will not be discussed here. Section 2 deals with data sources. In section 3, the APOLLO cloud detection technique is shortly described, together with the thresholds used and the products derived. In section 4 the method of analysis is shown including the remapping of the data, the averaging to boxes, the cloud classification, and the data control. Section 5 presents the achieved results which comprises the comparison with independent data and the identification of seasonal and regional effects. The discussion in section 6 reviews the possibility of detecting trends. 2 Data Sources This study relies on AVHRR observations made over the Alps and their forelands from the polar orbiting satellites NOAA-9, NOAA-11 and NOAA-14. Data from September 1991 till December 1996 and additionally the midseasonal months July and October of the years 1989 till 1991 are used to reach an 8-years period. The daily afternoon overpass is used for this study, because a high solar elevation allows for an anisotropy correction (Kriebel et al., 1989) which is not too unrealistic. 2 Figure 1: Frame: study area in central Europe. Scene from NOAA-11 AVHRR channels 1, 2, 4 in orthogonal projection, 22 Oct. 1990, 12:53 UTC. The AVHRR channelshave been chosen to have a maximum response within the atmospheric windows. These five channels in atmospheric windows have weak absorption of atmospheric gases, therefore, the data are appropriate for studying surface and cloud properties. The AVHRR measures in five spectral bandpasses: channel 1 (0.56-0. 68pm), channel 2 (0.73-1.lpm). channel 3 (3.55-3. 93pm), channel 4 (10.3-11.3pm), channel 5 (11.5-12.5pm). The resolution of the subsatellite pixel is about 1 km in all channels. The study area (see Figure 1) extends from 44.25 N (northern Italy) to 49.25 N (southern Germany) and from 6.4 B (eastern France) to 13.6 E (central Austria). The NO A A satellites have an inclination of about 99°, so that the 560 x 550 km 2 study area needs about 800 AVHRR lines to be processed. One image line is sampled in 1/6 s, and the study area is scanned in 2.2 min. The AVHRR raw data are acquired from the DFD (Deutsches Fernerkundungsdatenzentrum) of the DLR. 3 3 Cloud detection Cloud detection from AVHRR data is performed by means of up to 5 threshold tests applied to each pixel. According to the interpretation of these test results, the pixels are separated into cloud free and not cloud free pixels. From the group of the not cloud free pixels, the fully cloudy pixels un­ identified by means of 2 more tests which are in fact taken from the first group but with different thresholds and interpretations. The results of these procedures are stored in a cloud mask in full spatial resolution. A combination of 3 tests resets cloudy to snowy pixels if there arc any (Gcscll, 1989). This procedure gives 4 kinds of pixels: cloud free, fully cloudy, snow/ice, and the rest which is called partially cloudy. According to the decision logic applied, the last group contains most of the uncertainties. This algorithm package makes up the first part of APOLLO. The second part allows to determine products from all pixels. Emphasis is put on the derivation of cloud properties. Presently, cloud cover, cloud top temperature, cloud optical thickness, cloud liquid/ice water path and cloud emissivity are implemented. The latter three are derived from channel 1 reflectance, relying on a simple parameterization. Further, each fully cloudy pixel is tested for being from a thick or from a thin cloud and the thick clouds are distinguished into low, medium and high clouds by their cloud top temperature. The cloud cover of the partially cloudy pixels is determined from the nearest cloud free and fully cloudy neighbours by means of a linear approach (cf. section 4.2). The cloud type of an individual partially cloudy pixel is set according to the most frequent cloud type within a 50 by 50 pixels environment. The threshold tests used in APOLLO for daytime data (Table 1) flag a cloud if the reflectance in channel 1 or 2 is higher than a threshold, the temperature in channel 4 is lower than a threshold, the temperature difference in channels 4 and 5 is higher than a threshold (thin cloud), the ratio of the reflectances in channels 2 and 1 is above a threshold over sea or below a threshold over land, and the spatial coherence over ocean in a 3x3 matrix shows a variance which is higher than a threshold. The ratio test gives erroneous results if applied to non-vegetated land surfaces.
Recommended publications
  • Weather and Climate: Changing Human Exposures K
    CHAPTER 2 Weather and climate: changing human exposures K. L. Ebi,1 L. O. Mearns,2 B. Nyenzi3 Introduction Research on the potential health effects of weather, climate variability and climate change requires understanding of the exposure of interest. Although often the terms weather and climate are used interchangeably, they actually represent different parts of the same spectrum. Weather is the complex and continuously changing condition of the atmosphere usually considered on a time-scale from minutes to weeks. The atmospheric variables that characterize weather include temperature, precipitation, humidity, pressure, and wind speed and direction. Climate is the average state of the atmosphere, and the associated characteristics of the underlying land or water, in a particular region over a par- ticular time-scale, usually considered over multiple years. Climate variability is the variation around the average climate, including seasonal variations as well as large-scale variations in atmospheric and ocean circulation such as the El Niño/Southern Oscillation (ENSO) or the North Atlantic Oscillation (NAO). Climate change operates over decades or longer time-scales. Research on the health impacts of climate variability and change aims to increase understanding of the potential risks and to identify effective adaptation options. Understanding the potential health consequences of climate change requires the development of empirical knowledge in three areas (1): 1. historical analogue studies to estimate, for specified populations, the risks of climate-sensitive diseases (including understanding the mechanism of effect) and to forecast the potential health effects of comparable exposures either in different geographical regions or in the future; 2. studies seeking early evidence of changes, in either health risk indicators or health status, occurring in response to actual climate change; 3.
    [Show full text]
  • Articles from Bon, Inorganic Aerosol and Sea Salt
    Atmos. Chem. Phys., 18, 6585–6599, 2018 https://doi.org/10.5194/acp-18-6585-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 3.0 License. Meteorological controls on atmospheric particulate pollution during hazard reduction burns Giovanni Di Virgilio1, Melissa Anne Hart1,2, and Ningbo Jiang3 1Climate Change Research Centre, University of New South Wales, Sydney, 2052, Australia 2Australian Research Council Centre of Excellence for Climate System Science, University of New South Wales, Sydney, 2052, Australia 3New South Wales Office of Environment and Heritage, Sydney, 2000, Australia Correspondence: Giovanni Di Virgilio ([email protected]) Received: 22 May 2017 – Discussion started: 28 September 2017 Revised: 22 January 2018 – Accepted: 21 March 2018 – Published: 8 May 2018 Abstract. Internationally, severe wildfires are an escalating build-up of PM2:5. These findings indicate that air pollution problem likely to worsen given projected changes to climate. impacts may be reduced by altering the timing of HRBs by Hazard reduction burns (HRBs) are used to suppress wild- conducting them later in the morning (by a matter of hours). fire occurrences, but they generate considerable emissions Our findings support location-specific forecasts of the air of atmospheric fine particulate matter, which depend upon quality impacts of HRBs in Sydney and similar regions else- prevailing atmospheric conditions, and can degrade air qual- where. ity. Our objectives are to improve understanding of the re- lationships between meteorological conditions and air qual- ity during HRBs in Sydney, Australia. We identify the pri- mary meteorological covariates linked to high PM2:5 pollu- 1 Introduction tion (particulates < 2.5 µm in diameter) and quantify differ- ences in their behaviours between HRB days when PM2:5 re- Many regions experience regular wildfires with the poten- mained low versus HRB days when PM2:5 was high.
    [Show full text]
  • Quantifying the Impact of Synoptic Weather Types and Patterns On
    1 Quantifying the impact of synoptic weather types and patterns 2 on energy fluxes of a marginal snowpack 3 Andrew Schwartz1, Hamish McGowan1, Alison Theobald2, Nik Callow3 4 1Atmospheric Observations Research Group, University of Queensland, Brisbane, 4072, Australia 5 2Department of Environment and Science, Queensland Government, Brisbane, 4000, Australia 6 3School of Agriculture and Environment, University of Western Australia, Perth, 6009, Australia 7 8 Correspondence to: Andrew J. Schwartz ([email protected]) 9 10 Abstract. 11 Synoptic weather patterns are investigated for their impact on energy fluxes driving melt of a marginal snowpack 12 in the Snowy Mountains, southeast Australia. K-means clustering applied to ECMWF ERA-Interim data identified 13 common synoptic types and patterns that were then associated with in-situ snowpack energy flux measurements. 14 The analysis showed that the largest contribution of energy to the snowpack occurred immediately prior to the 15 passage of cold fronts through increased sensible heat flux as a result of warm air advection (WAA) ahead of the 16 front. Shortwave radiation was found to be the dominant control on positive energy fluxes when individual 17 synoptic weather types were examined. As a result, cloud cover related to each synoptic type was shown to be 18 highly influential on the energy fluxes to the snowpack through its reduction of shortwave radiation and 19 reflection/emission of longwave fluxes. As single-site energy balance measurements of the snowpack were used 20 for this study, caution should be exercised before applying the results to the broader Australian Alps region. 21 However, this research is an important step towards understanding changes in surface energy flux as a result of 22 shifts to the global atmospheric circulation as anthropogenic climate change continues to impact marginal winter 23 snowpacks.
    [Show full text]
  • UNIVERSITY of CALIFORNIA Los Angeles Southern California
    UNIVERSITY OF CALIFORNIA Los Angeles Southern California Climate and Vegetation Over the Past 125,000 Years from Lake Sequences in the San Bernardino Mountains A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Geography by Katherine Colby Glover 2016 © Copyright by Katherine Colby Glover 2016 ABSTRACT OF THE DISSERTATION Southern California Climate and Vegetation Over the Past 125,000 Years from Lake Sequences in the San Bernardino Mountains by Katherine Colby Glover Doctor of Philosophy in Geography University of California, Los Angeles, 2016 Professor Glen Michael MacDonald, Chair Long sediment records from offshore and terrestrial basins in California show a history of vegetation and climatic change since the last interglacial (130,000 years BP). Vegetation sensitive to temperature and hydroclimatic change tended to be basin-specific, though the expansion of shrubs and herbs universally signalled arid conditions, and landscpe conversion to steppe. Multi-proxy analyses were conducted on two cores from the Big Bear Valley in the San Bernardino Mountains to reconstruct a 125,000-year history for alpine southern California, at the transition between mediterranean alpine forest and Mojave desert. Age control was based upon radiocarbon and luminescence dating. Loss-on-ignition, magnetic susceptibility, grain size, x-ray fluorescence, pollen, biogenic silica, and charcoal analyses showed that the paleoclimate of the San Bernardino Mountains was highly subject to globally pervasive forcing mechanisms that register in northern hemispheric oceans. Primary productivity in Baldwin Lake during most of its ii history showed a strong correlation to historic fluctuations in local summer solar radiation values.
    [Show full text]
  • CLOUD FRACTION: CAN IT BE DEFINED and MEASURED? and IF WE KNEW IT WOULD IT BE of ANY USE to US? Stephen E
    CLOUD FRACTION: CAN IT BE DEFINED AND MEASURED? AND IF WE KNEW IT WOULD IT BE OF ANY USE TO US? Stephen E. Schwartz Upton NY USA Cloud Properties, Observations, and their Uncertainties www.bnl.gov/envsci/schwartz CLOUD FRACTION: CAN IT BE DEFINED AND MEASURED? AND IF WE KNEW IT WOULD IT BE OF ANY USE TO US? CONCLUSIONS No. No. No. I come to bury cloud fraction, not to praise it. - Shakespeare, 1599 WHAT IS A CLOUD? AMS Glossary of Meteorology (2000) A visible aggregate of minute water droplets and/or ice particles in the atmosphere above the earth’s surface. Total cloud cover: Fraction of the sky hidden by all visible clouds. Clothiaux, Barker, & Korolev (2005) Surprisingly, and in spite of the fact that we deal with clouds on a daily basis, to date there is no universal definition of a cloud. Ultimately, the definition of a cloud depends on the threshold sensitivity of the instruments used. Ramanathan, JGR (ERBE, 1988) Cloud cover is a loosely defined term. Potter Stewart (U.S. Supreme Court, 1964) I shall not today attempt further to define it, but I know it when I see it. WHY DO WE WANT TO KNOW CLOUD FRACTION, ANYWAY? Clouds have a strong impact on Earth’s radiation budget: -45 W m-2 shortwave; +30 W m-2 longwave. Slight change in cloud fraction could augment or offset greenhouse gas induced warming – cloud feedbacks. Getting cloud fraction “right” is an evaluation criterion for global climate models. Domain Observations Cloud cover Millions % Land 116 52.4 Ocean 43.3 64.8 Global 159 61.2 Warren, Hahn, London, Chervin, Jenne CLOUD FRACTION BY MULTIPLE METHODS 2 Surface, 3 satellite methods at U.S.
    [Show full text]
  • Print Key. (Pdf)
    Weather Map Symbols Along the center, the cloud types are indicated. The top symbol is the high-level cloud type followed by the At the upper right is the In the upper left, the temperature mid-level cloud type. The lowest symbol represents low-level cloud over a number which tells the height of atmospheric pressure reduced to is plotted in Fahrenheit. In this the base of that cloud (in hundreds of feet) In this example, the high level cloud is Cirrus, the mid-level mean sea level in millibars (mb) A example, the temperature is 77°F. B C C to the nearest tenth with the cloud is Altocumulus and the low-level clouds is a cumulonimbus with a base height of 2000 feet. leading 9 or 10 omitted. In this case the pressure would be 999.8 mb. If the pressure was On the second row, the far-left Ci Dense Ci Ci 3 Dense Ci Cs below Cs above Overcast Cs not Cc plotted as 024 it would be 1002.4 number is the visibility in miles. In from Cb invading 45° 45°; not Cs ovcercast; not this example, the visibility is sky overcast increasing mb. When trying to determine D whether to add a 9 or 10 use the five miles. number that will give you a value closest to 1000 mb. 2 As Dense As Ac; semi- Ac Standing Ac invading Ac from Cu Ac with Ac Ac of The number at the lower left is the a/o Ns transparent Lenticularis sky As / Ns congestus chaotic sky Next to the visibility is the present dew point temperature.
    [Show full text]
  • Composite VORTEX2 Supercell Environments from Near-Storm Soundings
    508 MONTHLY WEATHER REVIEW VOLUME 142 Composite VORTEX2 Supercell Environments from Near-Storm Soundings MATTHEW D. PARKER Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina (Manuscript received 23 May 2013, in final form 29 August 2013) ABSTRACT Three-dimensional composite analyses using 134 soundings from the second Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX2) reveal the nature of near-storm variability in the envi- ronments of supercell thunderstorms. Based upon the full analysis, it appears that vertical wind shear in- creases as one approaches a supercell within the inflow sector, providing favorable conditions for supercell maintenance (and possibly tornado formation) despite small amounts of low-level cooling near the storm. The seven analyzed tornadic supercells have a composite environment that is clearly more impressive (in terms of widely used metrics) than that of the five analyzed nontornadic supercells, including more convective available potential energy (CAPE), more vertical wind shear, higher boundary layer relative humidity, and lower tropospheric horizontal vorticity that is more streamwise in the near-storm inflow. The widely used supercell composite parameter (SCP) and significant tornado parameter (STP) summarize these differences well. Comparison of composite environments from early versus late in supercells’ lifetimes reveals only subtle signs of storm-induced environmental modification, but potentially important changes associated with the evening transition toward a cooler and moister boundary layer with enhanced low-level vertical shear. Finally, although this study focused primarily on the composite inflow environment, it is intriguing that the outflows sampled by VORTEX2 soundings were surprisingly shallow (generally #500 m deep) and retained consid- 2 erable CAPE (generally $1000 J kg 1).
    [Show full text]
  • Using GOES Imagery on AWIPS to Determine Cloud Cover and Snow Cover Kevin J
    Using GOES imagery on AWIPS to determine cloud cover and snow cover Kevin J. Schrab WR­SSD This TA­lite will show how AWIPS can be used to determine cloud cover and snow cover. A 4­panel image of VIS, IR, fog/refl/IR, and fog/refl from 18z on 18 Feb 2000 shows many interesting features. The VIS clearly depicts bare ground (Snake River plain and western Utah, for example). However, over much of the area it is difficult to distinguish between snow cover and cloud cover. This determination will obviously have a big impact on the public and aviation forecasts. The IR imagery (upper right panel) is not much help in differentiating snow cover from clouds. The fog/reflectivity product (lower right panel) clearly shows water clouds (white areas) over SE Montana, much of Wyoming, E Idaho, and NE Utah. The areas that are white in the VIS imagery and dark in the fog/reflectivity product imagery are snow cover (much of NE Montana, central Montana, portions of W Wyoming, and central Idaho). Fading between the VIS and fog/reflectivity product (toggle on AWIPS) clearly defines the cloud covered areas. Of course, we do not know if the water clouds identified by the fog/reflectivty product are fog or stratus. So, surface observations are important to determine the cloud type. At 18Z we see that some of the small cloud patches are fog and some are stratus. It is also interesting to note that some of the METARs show cloud cover, yet the cloud cover is just a small patch of clouds near the METAR site and that surrounding areas are clear.
    [Show full text]
  • Intense Cold Wave of February 2011 Mike Hardiman, Forecaster, National Weather Service El Paso, TX / Santa Teresa, NM
    Intense Cold Wave of February 2011 Mike Hardiman, Forecaster, National Weather Service El Paso, TX / Santa Teresa, NM Synopsis On Tuesday, February 1st, 2011, an intense arctic air mass moved into southern New Mexico and Far West Texas, while an upper-level trough moved in from the north. The system brought locally heavy snowfall to portions of the area on the night of Feb 1st and into the afternoon of the 2nd, and was followed by several days of sub-freezing temperatures. Temperatures in El Paso rose no higher than the upper 10s (°F) on February 2nd and 3rd. The prolonged cold weather caused widespread failures of infrastructure. Water and Gas utilities suffered from broken pipes and mains, with water leaks flooding several homes. At El Paso Electric, all eight primary power generators failed due to freezing conditions. While energy was brought into the area from elsewhere on the grid, rolling blackouts were implemented during peak electric use hours. Even as temperatures warmed up, water shortages continued to affect the El Paso and Sunland Park areas, as failed pumps caused reservoirs to quickly dry up. Meteorological Summary On Sunday, January 30th, a strong and sharply-defined upper level high pressure ridge was building across western Canada into the Arctic Ocean [Figure 1]. Northerly flow to the east of the Ridge allowed cold air from the polar regions to begin flowing south into the Yukon and Northwest Territories. By the next morning, temperatures in the -30 and -40s (°F) were common across northern Alberta and Saskatchewan, under a strengthening 1048 millibar (mb) surface high.
    [Show full text]
  • Outlook on Climate Change Adaptation in the Tropical Andes Mountains
    MOUNTAIN ADAPTATION OUTLOOK SERIES Outlook on climate change adaptation in the Tropical Andes mountains 1 Southern Bogota, Colombia photo: cover Front DISCLAIMER The development of this publication has been supported by the United Nations Environment Programme (UNEP) in the context of its inter-regional project “Climate change action in developing countries with fragile mountainous ecosystems from a sub-regional perspective”, which is financially co-supported by the Government Production Team of Austria (Austrian Federal Ministry of Agriculture, Forestry, Tina Schoolmeester, GRID-Arendal Environment and Water Management). Miguel Saravia, CONDESAN Magnus Andresen, GRID-Arendal Julio Postigo, CONDESAN, Universidad del Pacífico Alejandra Valverde, CONDESAN, Pontificia Universidad Católica del Perú Matthias Jurek, GRID-Arendal Björn Alfthan, GRID-Arendal Silvia Giada, UNEP This synthesis publication builds on the main findings and results available on projects and activities that have been conducted. Contributors It is based on available information, such as respective national Angela Soriano, CONDESAN communications by countries to the United Nations Framework Bert de Bievre, CONDESAN Convention on Climate Change (UNFCCC) and peer-reviewed Boris Orlowsky, University of Zurich, Switzerland literature. It is based on review of existing literature and not on new Clever Mafuta, GRID-Arendal scientific results generated through the project. Dirk Hoffmann, Instituto Boliviano de la Montana - BMI Edith Fernandez-Baca, UNDP The contents of this publication do not necessarily reflect the Eva Costas, Ministry of Environment, Ecuador views or policies of UNEP, contributory organizations or any Gabriela Maldonado, CONDESAN governmental authority or institution with which its authors or Harald Egerer, UNEP contributors are affiliated, nor do they imply any endorsement.
    [Show full text]
  • An Empirical Note on Weather Effects in the Australian Stock Market
    An empirical note on weather effects in the Australian stock market Author Worthington, Andrew Published 2009 Journal Title Economic Papers DOI https://doi.org/10.1111/j.1759-3441.2009.00014.x Copyright Statement © 2009 The Economic Society of Australia. Published by Blackwell Publishing. This is the pre-peer reviewed version of the following article: Economic Papers Vol. 28, No. 2, June, 2009, 148–154 which has been published in final form at http://dx.doi.org/10.1111/ j.1759-3441.2009.00014.x Downloaded from http://hdl.handle.net/10072/30698 Link to published version http://www.interscience.wiley.com/jpages/0812-0439 Griffith Research Online https://research-repository.griffith.edu.au AN EMPIRICAL NOTE ON WEATHER EFFECTS IN THE AUSTRALIAN STOCK MARKET ABSTRACT The behavioural finance literature posits a link between the weather and equity markets via investor moods. This paper examines the impact of weather on the Australian stock market over the period 1958 to 2005. A regression-based approach is employed where daily market returns on the Australian Securities Exchange’s All Ordinaries price index are regressed against eight daily weather observations (precipitation, evaporation, relative humidity, maximum and minimum temperature, hours of bright sunshine, and the speed and direction of the maximum wind gust) at Sydney’s Observatory Hill and Airport meteorological stations. Consistent with studies elsewhere including the Australian market, the results indicate that the weather has absolutely no influence on market returns. Some directions for future research that may help address some of the deficiencies found in this intriguing body of work are provided.
    [Show full text]
  • A High-Quality Monthly Total Cloud Amount Dataset for Australia
    Climatic Change (2011) 108:485–517 DOI 10.1007/s10584-010-9992-5 A high-quality monthly total cloud amount dataset for Australia Branislava Jovanovic · Dean Collins · Karl Braganza · Doerte Jakob · David A. Jones Received: 11 May 2009 / Accepted: 5 November 2010 / Published online: 16 December 2010 © The Author(s) 2010. This article is published with open access at Springerlink.com Abstract A high-quality monthly total cloud amount dataset for 165 stations has been developed for monitoring and assessing long-term trends in cloud cover over Australia. The dataset is based on visual 9 a.m. and 3 p.m. observations of total cloud amount, with most records starting around 1957. The quality control process involved examination of historical station metadata, together with an objective statistical test comparing candidate and reference cloud series. Individual cloud series were also compared against rainfall and diurnal temperature range series from the same site, and individual cloud series from neighboring sites. Adjustments for inhomogeneities caused by relocations and changes in observers were applied, as well as adjustments for biases caused by the shift to daylight saving time in the summer months. Analysis of these data reveals that the Australian mean annual total cloud amount is characterised by high year-to-year variability and shows a weak, statistically non-significant increase over the 1957–2007 period. A more pronounced, but also non-significant, decrease from 1977 to 2007 is evident. A strong positive correlation is found between all-Australian averages of cloud amount and rainfall, while a strong negative correlation is found between mean cloud amount and diurnal temperature range.
    [Show full text]