Introduction to Meteorology (Weather & Climate) Atmo
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Meteorology Climate
Meteorology: Climate • Climate is the third topic in the B-Division Science Olympiad Meteorology Event. • Topics rotate annually so a middle school participant may receive a comprehensive course of instruction in meteorology during this three-year cycle. • Sequence: 1. Climate (2006) 2. Everyday Weather (2007) 3. Severe Storms (2008) Weather versus Climate Weather occurs in the troposphere from day to day and week to week and even year to year. It is the state of the atmosphere at a particular location and moment in time. http://weathereye.kgan.com/cadet/cl imate/climate_vs.html http://apollo.lsc.vsc.edu/classes/me t130/notes/chapter1/wea_clim.html Weather versus Climate Climate is the sum of weather trends over long periods of time (centuries or even thousands of years). http://calspace.ucsd.edu/virtualmuseum/ climatechange1/07_1.shtml Weather versus Climate The nature of weather and climate are determined by many of the same elements. The most important of these are: 1. Temperature. Daily extremes in temperature and average annual temperatures determine weather over the short term; temperature tendencies determine climate over the long term. 2. Precipitation: including type (snow, rain, ground fog, etc.) and amount 3. Global circulation patterns: both oceanic and atmospheric 4. Continentiality: presence or absence of large land masses 5. Astronomical factors: including precession, axial tilt, eccen- tricity of Earth’s orbit, and variable solar output 6. Human impact: including green house gas emissions, ozone layer degradation, and deforestation http://www.ecn.ac.uk/Education/factors_affecting_climate.htm http://www.necci.sr.unh.edu/necci-report/NERAch3.pdf http://www.bbm.me.uk/portsdown/PH_731_Milank.htm Natural Climatic Variability Natural climatic variability refers to naturally occurring factors that affect global temperatures. -
How the Ocean Affects Weather & Climate
Ocean in Motion 6: How does the Ocean Change Weather and Climate? A. Overview 1. The Ocean in Motion -- Weather and Climate In this program we will tie together ideas from previous lectures on ocean circulation. The students will also learn about the similarities and interactions between the atmosphere and the ocean. 2. Contents of Packet Your packet contains the following activities: I. A Sea of Words B. Program Preparation 1. Focus Points OThe oceans and the atmosphere are closely linked 1. the sun heats the atmosphere as well as the oceans 2. water evaporates from the ocean into the atmosphere a. forms clouds and precipitation b. movement of any fluid (gas or liquid) due to heating creates convective currents OWeather and climate are two different things. 1. Winds a. Uneven heating and cooling of the atmosphere creates wind b. Global ocean surface current patterns are similar to global surface wind patterns c. wind patterns are analogous to ocean currents 2. Four seasons OAtmospheric motion 1. weather and air moves from high to low pressure areas 2. the earth's rotation also influences air and weather patterns 3. Atmospheric winds move surface ocean currents. ©1998 Project Oceanography Spring Series Ocean in Motion 1 C. Showtime 1. Broadcast Topics This broadcast will link into discussions on ocean and atmospheric circulation, wind patterns, and how climate and weather are two different things. a. Brief Review We know the modern reason for studying ocean circulation is because it is a major part of our climate. We talked about how the sun provides heat energy to the world, and how the ocean currents circulate because the water temperatures and densities vary. -
Climate Change and Human Health: Risks and Responses
Climate change and human health RISKS AND RESPONSES Editors A.J. McMichael The Australian National University, Canberra, Australia D.H. Campbell-Lendrum London School of Hygiene and Tropical Medicine, London, United Kingdom C.F. Corvalán World Health Organization, Geneva, Switzerland K.L. Ebi World Health Organization Regional Office for Europe, European Centre for Environment and Health, Rome, Italy A.K. Githeko Kenya Medical Research Institute, Kisumu, Kenya J.D. Scheraga US Environmental Protection Agency, Washington, DC, USA A. Woodward University of Otago, Wellington, New Zealand WORLD HEALTH ORGANIZATION GENEVA 2003 WHO Library Cataloguing-in-Publication Data Climate change and human health : risks and responses / editors : A. J. McMichael . [et al.] 1.Climate 2.Greenhouse effect 3.Natural disasters 4.Disease transmission 5.Ultraviolet rays—adverse effects 6.Risk assessment I.McMichael, Anthony J. ISBN 92 4 156248 X (NLM classification: WA 30) ©World Health Organization 2003 All rights reserved. Publications of the World Health Organization can be obtained from Marketing and Dis- semination, World Health Organization, 20 Avenue Appia, 1211 Geneva 27, Switzerland (tel: +41 22 791 2476; fax: +41 22 791 4857; email: [email protected]). Requests for permission to reproduce or translate WHO publications—whether for sale or for noncommercial distribution—should be addressed to Publications, at the above address (fax: +41 22 791 4806; email: [email protected]). The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the World Health Organization concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. -
The Definition of El Niño
The Definition of El Niño Kevin E. Trenberth National Center for Atmospheric Research,* Boulder, Colorado ABSTRACT A review is given of the meaning of the term “El Niño” and how it has changed in time, so there is no universal single definition. This needs to be recognized for scientific uses, and precision can only be achieved if the particular definition is identified in each use to reduce the possibility of misunderstanding. For quantitative purposes, possible definitions are explored that match the El Niños identified historically after 1950, and it is suggested that an El Niño can be said to occur if 5-month running means of sea surface temperature (SST) anomalies in the Niño 3.4 region (5°N–5°S, 120°–170°W) exceed 0.4°C for 6 months or more. With this definition, El Niños occur 31% of the time and La Niñas (with an equivalent definition) occur 23% of the time. The histogram of Niño 3.4 SST anomalies reveals a bimodal char- acter. An advantage of such a definition is that it allows the beginning, end, duration, and magnitude of each event to be quantified. Most El Niños begin in the northern spring or perhaps summer and peak from November to January in sea surface temperatures. 1. Introduction received into account. A brief review is given of the various uses of the term and attempts to define it. It is The term “El Niño” has evolved in its meaning even more difficult to come up with a satisfactory over the years, leading to confusion in its use. -
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. -
Sea-Level Rise for the Coasts of California, Oregon, and Washington: Past, Present, and Future
Sea-Level Rise for the Coasts of California, Oregon, and Washington: Past, Present, and Future As more and more states are incorporating projections of sea-level rise into coastal planning efforts, the states of California, Oregon, and Washington asked the National Research Council to project sea-level rise along their coasts for the years 2030, 2050, and 2100, taking into account the many factors that affect sea-level rise on a local scale. The projections show a sharp distinction at Cape Mendocino in northern California. South of that point, sea-level rise is expected to be very close to global projections; north of that point, sea-level rise is projected to be less than global projections because seismic strain is pushing the land upward. ny significant sea-level In compliance with a rise will pose enor- 2008 executive order, mous risks to the California state agencies have A been incorporating projec- valuable infrastructure, devel- opment, and wetlands that line tions of sea-level rise into much of the 1,600 mile shore- their coastal planning. This line of California, Oregon, and study provides the first Washington. For example, in comprehensive regional San Francisco Bay, two inter- projections of the changes in national airports, the ports of sea level expected in San Francisco and Oakland, a California, Oregon, and naval air station, freeways, Washington. housing developments, and sports stadiums have been Global Sea-Level Rise built on fill that raised the land Following a few thousand level only a few feet above the years of relative stability, highest tides. The San Francisco International Airport (center) global sea level has been Sea-level change is linked and surrounding areas will begin to flood with as rising since the late 19th or to changes in the Earth’s little as 40 cm (16 inches) of sea-level rise, a early 20th century, when climate. -
Geographical Influences on Climate Teacher Guide
Geographical Influences on Climate Teacher Guide Lesson Overview: Students will compare the climatograms for different locations around the United States to observe patterns in temperature and precipitation. They will describe geographical features near those locations, and compare graphs to find patterns in the effect of mountains, oceans, elevation, latitude, etc. on temperature and precipitation. Then, students will research temperature and precipitation patterns at various locations around the world using the MY NASA DATA Live Access Server and other sources, and use the information to create their own climatogram. Expected time to complete lesson: One 45 minute period to compare given climatograms, one to two 45 minute periods to research another location and create their own climatogram. To lessen the time needed, you can provide students data rather than having them find it themselves (to focus on graphing and analysis), or give them the template to create a climatogram (to focus on the analysis and description), or give them the assignment for homework. See GPM Geographical Influences on Climate – Climatogram Template and Data for these options. Learning Objectives: - Students will brainstorm geographic features, consider how they might affect temperature and precipitation, and discuss the difference between weather and climate. - Students will examine data about a location and calculate averages to compare with other locations to determine the effect of geographic features on temperature and precipitation. - Students will research the climate patterns of a location and create a climatogram and description of what factors affect the climate at that location. National Standards: ESS2.D: Weather and climate are influenced by interactions involving sunlight, the ocean, the atmosphere, ice, landforms, and living things. -
Effects of Climate Change on Sea Levels and Inundation Relevant to the Pacific Islands
PACIFIC MARINE CLIMATE CHANGE REPORT CARD Science Review 2018: pp 43-49 Effects of Climate Change on Sea Levels and Inundation Relevant to the Pacific Islands Jerome Aucan, Institut de Recherche pour le Développement (IRD), New Caledonia. EXECUTIVE SUMMARY Sea level rise is a major consequence of climate change. The global sea level rise is due to a combination of the thermal expansion of the oceans (because of their warming), and an increase in runoff from the melting of continental glaciers (which adds water to the oceans). The rate of global mean sea level (GMSL) has likely accelerated during the last century, and projections predict that sea level will be 0.4 to 0.8 m higher at the end of this century around the Pacific islands. Regional variations in sea level also exist and are due to large scale current or climate features. In addition, the sea level experienced on Pacific islands can also be affected by vertical land movements that can either increase or decrease the effects of the rise in GMSL. Coastal inundations are caused by a combination of high waves, tides, storm surge, or ocean eddies. While future changes in the number and severity of high waves and storms are still difficult to assess, a rise in GMSL will cause an increase in the frequency and severity of inundation in coastal areas. The island countries of the Pacific have, and will continue to experience, a positive rate of sea level rise. This sea level rise will cause a significant increase in the frequency and severity of coastal flooding in the near future. -
Causes of Sea Level Rise
FACT SHEET Causes of Sea OUR COASTAL COMMUNITIES AT RISK Level Rise What the Science Tells Us HIGHLIGHTS From the rocky shoreline of Maine to the busy trading port of New Orleans, from Roughly a third of the nation’s population historic Golden Gate Park in San Francisco to the golden sands of Miami Beach, lives in coastal counties. Several million our coasts are an integral part of American life. Where the sea meets land sit some of our most densely populated cities, most popular tourist destinations, bountiful of those live at elevations that could be fisheries, unique natural landscapes, strategic military bases, financial centers, and flooded by rising seas this century, scientific beaches and boardwalks where memories are created. Yet many of these iconic projections show. These cities and towns— places face a growing risk from sea level rise. home to tourist destinations, fisheries, Global sea level is rising—and at an accelerating rate—largely in response to natural landscapes, military bases, financial global warming. The global average rise has been about eight inches since the centers, and beaches and boardwalks— Industrial Revolution. However, many U.S. cities have seen much higher increases in sea level (NOAA 2012a; NOAA 2012b). Portions of the East and Gulf coasts face a growing risk from sea level rise. have faced some of the world’s fastest rates of sea level rise (NOAA 2012b). These trends have contributed to loss of life, billions of dollars in damage to coastal The choices we make today are critical property and infrastructure, massive taxpayer funding for recovery and rebuild- to protecting coastal communities. -
Global Warming Impacts on Severe Drought Characteristics in Asia Monsoon Region
water Article Global Warming Impacts on Severe Drought Characteristics in Asia Monsoon Region Jeong-Bae Kim , Jae-Min So and Deg-Hyo Bae * Department of Civil & Environmental Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-Gu, Seoul 05006, Korea; [email protected] (J.-B.K.); [email protected] (J.-M.S.) * Correspondence: [email protected]; Tel.: +82-2-3408-3814 Received: 2 April 2020; Accepted: 7 May 2020; Published: 12 May 2020 Abstract: Climate change influences the changes in drought features. This study assesses the changes in severe drought characteristics over the Asian monsoon region responding to 1.5 and 2.0 ◦C of global average temperature increases above preindustrial levels. Based on the selected 5 global climate models, the drought characteristics are analyzed according to different regional climate zones using the standardized precipitation index. Under global warming, the severity and frequency of severe drought (i.e., SPI < 1.5) are modulated by the changes in seasonal and regional precipitation − features regardless of the region. Due to the different regional change trends, global warming is likely to aggravate (or alleviate) severe drought in warm (or dry/cold) climate zones. For seasonal analysis, the ranges of changes in drought severity (and frequency) are 11.5%~6.1% (and 57.1%~23.2%) − − under 1.5 and 2.0 ◦C of warming compared to reference condition. The significant decreases in drought frequency are indicated in all climate zones due to the increasing precipitation tendency. In general, drought features under global warming closely tend to be affected by the changes in the amount of precipitation as well as the changes in dry spell length. -
Weather & Climate
Weather & Climate July 2018 “Weather is what you get; Climate is what you expect.” Weather consists of the short-term (minutes to days) variations in the atmosphere. Weather is expressed in terms of temperature, humidity, precipitation, cloudiness, visibility and wind. Climate is the slowly varying aspect of the atmosphere-hydrosphere-land surface system. It is typically characterized in terms of averages of specific states of the atmosphere, ocean, and land, including variables such as temperature (land, ocean, and atmosphere), salinity (oceans), soil moisture (land), wind speed and direction (atmosphere), and current strength and direction (oceans). Example of Weather vs. Climate The actual observed temperatures on any given day are considered weather, whereas long-term averages based on observed temperatures are considered climate. For example, climate averages provide estimates of the maximum and minimum temperatures typical of a given location primarily based on analysis of historical data. Consider the evolution of daily average temperature near Washington DC (40N, 77.5W). The black line is the climatological average for the period 1979-1995. The actual daily temperatures (weather) for 1 January to 31 December 2009 are superposed, with red indicating warmer-than-average and blue indicating cooler-than-average conditions. Departures from the average are generally largest during winter and smallest during summer at this location. Weather Forecasts and Climate Predictions / Projections Weather forecasts are assessments of the future state of the atmosphere with respect to conditions such as precipitation, clouds, temperature, humidity and winds. Climate predictions are usually expressed in probabilistic terms (e.g. probability of warmer or wetter than average conditions) for periods such as weeks, months or seasons. -
Climate Change and Drought
Climate Change and Drought What it means to tribes and how we can adapt What is drought? These two issues in concert present serious questions The National Oceanic and Atmospheric Administration about water availability and access into the future. (NOAA) defines drought as “a deficiency in precipitation Quick facts about drought in the Southwest: over an extended period, usually a season or more, The Southwest has been in a consistent state of resulting in a water shortage causing adverse impacts on drought since 1999. vegetation, animals, and/or people[1]”. The West has Historical drought trends along with projected often suffered from extensive drought periods including temperature increases suggest that droughts will some of the longest drought events on Earth - so called become even more severe over time. mega-droughts[2]. As global temperatures rise due to climate change, areas such as the Southwest are likely Reconstructed drought trends (assembled from to experience “increasing and deepening drought tree ring data) indicate longer drought patterns conditions[3]”. This could have devastating effects on over the last 100 years than previously observed. water supply for ecosystems, agriculture, and for human Winter and spring storm tracks, which bring annual consumption. regional rain, are projected to shift northward. What are the facts? Over the last century the average global temperature has increased by approximately 1.2° C (2.2° F)[4]. Comprehensive, long-term research by governmental agencies and academic institutions indicates that this temperature increase is directly linked to human activities - specifically large-scale greenhouse gas emissions. This human-induced, or anthropogenic, temperature change is causing variable global and Prolonged drought conditions can cause severe damage regional climatic effects.