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Uplift of Africa As a Potential Cause for Neogene Intensification of the Benguela Upwelling System
LETTERS PUBLISHED ONLINE: 21 SEPTEMBER 2014 | DOI: 10.1038/NGEO2249 Uplift of Africa as a potential cause for Neogene intensification of the Benguela upwelling system Gerlinde Jung*, Matthias Prange and Michael Schulz The Benguela Current, located o the west coast of southern negligible Neogene uplift of the South African Plateau18. Recently, Africa, is tied to a highly productive upwelling system1. Over for East Africa, evidence emerged for a rather simultaneous the past 12 million years, the current has cooled, and upwelling beginning of uplift of the eastern and western branches around has intensified2–4. These changes have been variously linked 25 million years ago19 (Ma), in contrast to a later uplift of the to atmospheric and oceanic changes associated with the western part around 5 Ma as previously suggested20. Palaeoelevation glaciation of Antarctica and global cooling5, the closure of change estimates, for example for the Bié Plateau, during the the Central American Seaway1,6 or the further restriction of past 10 Myr range from ∼150 m (ref. 16) to 1,000 m (ref.7 ). the Indonesian Seaway3. The upwelling intensification also These discrepancies depend strongly on the methods used for occurred during a period of substantial uplift of the African the estimation of uplift, some giving more reliable estimates of continent7,8. Here we use a coupled ocean–atmosphere general the timing of uplift than of uplift rates16, whereas others are circulation model to test the eect of African uplift on Benguela better suited for estimating palaeoelevations but less accurate upwelling. In our simulations, uplift in the East African Rift in the timing7. -
Rapid Intensification of a Sheared Tropical Storm
OCTOBER 2010 M O L I N A R I A N D V O L L A R O 3869 Rapid Intensification of a Sheared Tropical Storm JOHN MOLINARI AND DAVID VOLLARO Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, New York (Manuscript received 10 February 2010, in final form 28 April 2010) ABSTRACT A weak tropical storm (Gabrielle in 2001) experienced a 22-hPa pressure fall in less than 3 h in the presence of 13 m s21 ambient vertical wind shear. A convective cell developed downshear left of the center and moved cyclonically and inward to the 17-km radius during the period of rapid intensification. This cell had one of the most intense 85-GHz scattering signatures ever observed by the Tropical Rainfall Measuring Mission (TRMM). The cell developed at the downwind end of a band in the storm core. Maximum vorticity in the cell exceeded 2.5 3 1022 s21. The cell structure broadly resembled that of a vortical hot tower rather than a supercell. At the time of minimum central pressure, the storm consisted of a strong vortex adjacent to the cell with a radius of maximum winds of about 10 km that exhibited almost no tilt in the vertical. This was surrounded by a broader vortex that tilted approximately left of the ambient shear vector, in a similar direction as the broad precipitation shield. This structure is consistent with the recent results of Riemer et al. The rapid deepening of the storm is attributed to the cell growth within a region of high efficiency of latent heating following the theories of Nolan and Vigh and Schubert. -
Soaring Weather
Chapter 16 SOARING WEATHER While horse racing may be the "Sport of Kings," of the craft depends on the weather and the skill soaring may be considered the "King of Sports." of the pilot. Forward thrust comes from gliding Soaring bears the relationship to flying that sailing downward relative to the air the same as thrust bears to power boating. Soaring has made notable is developed in a power-off glide by a conven contributions to meteorology. For example, soar tional aircraft. Therefore, to gain or maintain ing pilots have probed thunderstorms and moun altitude, the soaring pilot must rely on upward tain waves with findings that have made flying motion of the air. safer for all pilots. However, soaring is primarily To a sailplane pilot, "lift" means the rate of recreational. climb he can achieve in an up-current, while "sink" A sailplane must have auxiliary power to be denotes his rate of descent in a downdraft or in come airborne such as a winch, a ground tow, or neutral air. "Zero sink" means that upward cur a tow by a powered aircraft. Once the sailcraft is rents are just strong enough to enable him to hold airborne and the tow cable released, performance altitude but not to climb. Sailplanes are highly 171 r efficient machines; a sink rate of a mere 2 feet per second. There is no point in trying to soar until second provides an airspeed of about 40 knots, and weather conditions favor vertical speeds greater a sink rate of 6 feet per second gives an airspeed than the minimum sink rate of the aircraft. -
Navier-Stokes Equation
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Nasa.Gov Determine Their Severity Now Are a Little Less Mysterious
Print Close Related Links January 12, 2004 - (date of web publication) For more information contact: Elvia Thompson A "HOT TOWER" ABOVE THE EYE CAN MAKE HURRICANES Headquarters, Washington STRONGER (Phone: 202/358-1696) They are called hurricanes in the Rob Gutro Atlantic, typhoons in Goddard Space Flight Center, Greenbelt, the West Pacific, Md. and tropical (Phone: 301/286-4044) cyclones worldwide; but wherever these For information about the TRMM Satellite storms roam, the on the Internet, visit: forces that http://trmm.gsfc.nasa.gov determine their http://www.eorc.nasda.go.jp/TRMM severity now are a little less mysterious. NASA scientists, For information about NOAA's National Hurricane Center click here. using data from the Tropical Rainfall For information about Hurricane Measuring Mission Item 1 (TRMM) satellite, Bonnie, click here. have found "hot High resolution image tower" clouds are associated with tropical cyclone intensification. Viewable Images Owen Kelley and John Stout of NASA's Goddard Space Flight Center, Greenbelt, Md., and George Mason University will present their findings at the American Meteorological Society annual meeting in Seattle on Monday, January 12. Caption for Item 1: AN UNUSUALLY DEEP CONVECTIVE TOWER IN Kelley and Stout define a "hot tower" as a rain cloud that reaches at HURRICANE BONNIE AS BONNIE least to the top of the troposphere, the lowest layer of the atmosphere. INTENSIFIED It extends approximately nine miles (14.5 km) high in the tropics. These towers are called "hot" because they rise to such altitude due to This TRMM Precipitation Radar overflight of Hurricane Bonnie shows an 11 mile the large amount of latent heat. -
ASR-X Pro 3.00
9ÑSupplemental Information 9 Suppll ementttall II nffformatttii on Lii sttt offf ROM Waves KEYBOARD ELEC PIANO JAMM SNARE CONGA LOW PERC ORGAN LIVE SNARE CONGA MUTE DRAWBAR LUDWIG SNARE CONGA SLAP ORGAN MUTT SNARE CUICA PAD SYNTH REAL SNARE ETHNO COWBELL STRII NG-SOUND STRING HIT RIMSHOT GUIRO MUTE GUITAR SLANG SNARE MARACAS MUTE GUITARWF SPAK SNARE SHAKER GTR-SLIDE WOLF SNARE SHEKERE DN BRASS+HORNS HORN HIT ZEE SNARE SHEKERE UP WII ND+REEDS BARI SAX HIT BRUSH SLAP SLAP CLAP BASS-SOUND UPRIGHT BASS SIDE STICK 1 TAMBOURINE DN BS HARMONICS SIDE STICK 2 TAMBOURINE UP FM BASS STICKS TIMBALE HI ANALOG BASS 1 STUDIO TOM TIMBALE LO ANALOG BASS 2 ROCK TOM TIMBALE RIM FRETLESS BASS 909 TOM TRIANGLE HIT MUTE BASS SYNTH DRUM VIBRASLAP SLAP BASS CYMBALS 808 CLOSED HT WHISTLE DRUM-SOUND 2001 KICK 808 OPEN HAT WOODBLOCK 808 KICK 909 CLOSED HT TUNED-PERCUS BIG BELL AMBIENT KICK 909 OPEN HAT SMALL BELL BAM KICK HOUSE CL HAT GAMELAN BELL BANG KICK PEDAL HAT MARIMBA BBM KICK PZ CL HAT MARIMBA WF BOOM KICK R&B CL HAT SOUND-EFFECT SCRATCH 1 COSMO KICK SMACK CL HAT SCRATCH 2 ELECTRO KICK SNICK CL HAT SCRATCH 3 MUFF KICK STUDIO CL HAT SCRATCH 4 PZ KICK STUDIO OPHAT1 SCRATCH 5 SNICK KICK STUDIO OPHAT2 SCRATCH 6 THUMP KICK TECHNO HAT SCRATCH LOOP TITE KICK TIGHT CL HAT WAVEFORM SAWTOOTH WILD KICK TRANCE CL HAT SQUARE WAVE WOLF KICK CR78 OPENHAT TRIANGLE WAV WOO BOX KICK COMPRESS OPHT SQR+SAW WF 808 SNARE CRASH CYMBAL SINE WAVE 808 RIMSHOT CRASH LOOP ESQ BELL WF 909 SNARE RIDE CYMBAL BELL WF BANG SNARE RIDE BELL DIGITAL WF BIG ROCK SNAR CHINA CRASH E PIANO WF -
Different Ecological Processes Determined the Alpha and Beta Components of Taxonomic, Functional, and Phylogenetic Diversity
Different ecological processes determined the alpha and beta components of taxonomic, functional, and phylogenetic diversity for plant communities in dryland regions of Northwest China Jianming Wang1, Chen Chen1, Jingwen Li1, Yiming Feng2 and Qi Lu2 1 College of Forestry, Beijing Forestry University, Beijing, China 2 Institute of Desertification Studies, Chinese Academy of Forestry, Beijing, China ABSTRACT Drylands account for more than 30% of China’s terrestrial area, while the ecological drivers of taxonomic (TD), functional (FD) and phylogenetic (PD) diversity in dryland regions have not been explored simultaneously. Therefore, we selected 36 plots of desert and 32 plots of grassland (10 Â 10 m) from a typical dryland region of northwest China. We calculated the alpha and beta components of TD, FD and PD for 68 dryland plant communities using Rao quadratic entropy index, which included 233 plant species. Redundancy analyses and variation partitioning analyses were used to explore the relative influence of environmental and spatial factors on the above three facets of diversity, at the alpha and beta scales. We found that soil, climate, topography and spatial structures (principal coordinates of neighbor matrices) were significantly correlated with TD, FD and PD at both alpha and beta scales, implying that these diversity patterns are shaped by contemporary environment and spatial processes together. However, we also found that alpha diversity was predominantly regulated by spatial structure, whereas beta diversity was largely determined by environmental variables. Among environmental factors, TD was Submitted 10 June 2018 most strongly correlated with climatic factors at the alpha scale, while 5 December 2018 Accepted with soil factors at the beta scale. -
New Cloud Types 2019
UPSC MAIN & PRELIMS NEW CLOUD TYPES 2019 BY : NEETU SINGH This is updated material for New Cloud Types, targeting both upcoming Prelims and Main Exams. Video is attached to provide you with the gist of content. https://youtu.be/01Ciwd9b470 New Cloud Types PRINCIPLES OF CLOUD CLASSIFICATION Useful concepts Height, altitude, vertical extent Clouds continuously evolve and appear in an infinite variety of forms. However, there is a limited number · Height: Vertical distance from the point of of characteristic forms frequently observed all over observation on the Earth's surface to the point the world, into which clouds can be broadly grouped being measured. in a classification scheme. The scheme uses · Altitude: Vertical distance from mean sea level to genera(defined according to their appearance and the point being measured. position in the sky), species(describing shape and · Height/Altitude of cloud base: For surface structure) and varieties(describing transparency and observations, height of the cloud base above arrangement).This is similar to the systems used in ground level; for aircraft observations, altitude of the classification of plants or animals, and similarly the cloud base above mean sea level. uses Latin names. · Vertical extent: Vertical distance from a cloud's There are some intermediate or transitional forms of base to its top. clouds that, although observed fairly frequently, are Levels not described in the classification scheme. The transitional forms are of little interest; they are less Clouds are generally encountered over a range of stable and in appearance are not very different from altitudes varying from sea level to the top of the the definitions of the characteristic forms. -
Aviation Meteorology
International Journal of Latest Technology in Engineering, Management & Applied Science (IJLTEMAS) Volume VI, Issue VIIIS, August 2017 | ISSN 2278-2540 Aviation Meteorology Yashmitha Kumaran, N. Sumathi Amrita Vishwa Vidyapeetham, Coimbatore, Tamil Nadu, India Abstract: - The purpose of this paper is to highlight the general atmosphere plays a major role in protecting the Earth‟s life terms and definitions that falls under the ‘common set’ in the forms from the solar radiations, cosmic rays and meteoroids. intersection of the sets Meteorology and Aerospace Engineering. It is also responsible for maintaining the Earth‟s global It begins with the universal explanations for the meteorological temperature by insolation, reflection and circulation, and for phenomena under the ‘common set’ followed by the the scattering of sunlight, which enables us to perceive categorization of clouds and their influences on the aerial various colours. vehicles, the instrumentation used in Aeronautics to determine the required Meteorological quantities, factors affecting aviation, Oceans have a diurnal variation of just 2 to 3C and they effects of aviation on the clouds, and the corresponding protocols consist of two separate layers of water, warm and cold. The involved in deciphering the ‘common set’ elements. layer of separation is called thermocline. The upper (warm) It also talks about the relation between airport construction and layer is a heat reservoir and is 150 to 200 meters deep. This is Geology prior to concluding with the uses and successes of the cause for the genesis of several aquatic circulations like Meteorology in the field of Aerospace. the cyclones, the hurricanes and the typhoons. The Earth is at an average distance of 149,600,000 km from I. -
Meteorological Equipment Data Sheets
TM 750-5-3 TECHNICAL MANUAL METEOROLOGICAL EQUIPMENT DATA SHEETS HEADQUARTERS, DEPARTMENT OF THE ARMY 30 APRIL 1973 *TM 750–5–3 TECHNICAL MANUAL HEADQUARTERS DEPARTMENT OF THE ARMY No. 750–5–3 WASHINGTON, D.C., 30 April 1973 METEOROLOGICAL EQUIPMENT DATA SHEETS Paragraph Page SECTION I. INTRODUCTION Scope _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1 3 Purpose _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2 3 Organization of content _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ 3 3 US Army type classifications _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 4 3 Currency of information _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 5 4 Omitted data_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 6 4 II. -
North Sea Barotropic Tides Abstract Strategy of Mixed Meshes
Modelling of coastal long-wave dynamics on unstructured mixed meshes under strong nonlinearity and pronounced baroclinity Alexey Androsov, Sergey Danilov, Vera Fofonova, Natalja Rakowsky, Karen Helen Wiltshire and Sven Harig Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Postfach 12-01-61, 27515 Bremerhaven, Germany, ([email protected] +49(0471) 4831-2106) Abstract Results: North Sea barotropic tides Numerical modelling of coastal zone dynamics provides basis for solving a wide range of hydrogeological, engineering and ecological problems. A novel three-dimensional unstructured-mesh model is applied to simulate the dynamics of the density field and turbulence characteristics. The model is based on a finite-volume discretization and works on mixed unstructured meshes composed of triangles and quads. Although triangular meshes are Fig. 1 Fragments of the quads (left) and mixed (right) mesh used in numerical simulations. most flexible geometrically, quads are more efficient numerically and do not support spurious Fig. 2 Tidal map of the M2 wave: the amplitude in cm and phase (solid line) in inertial modes of triangular cell-vertex discretization. Mixed meshes composed of triangles and Here we present results of simulations of M2 tide in the degrees. The triangles indicate the station locations. A dashed rectangle shows North Sea. A large amount of observations is available the domain where the mesh is refined; the transition zone is over its periphery. quads combine benefits of both. In particular, triangular transitional zones can be used to join for this region helping to validate the model. Computations have been performed on three meshes quadrilateral meshes of differing resolution. -
Electricity and Magnetism (Cont'd), Light and Optics
Problems 931 53. Suppose you install a compass on the center of a car’s needle” is a magnetic compass mounted so that it can dashboard. (a) Assuming the dashboard is made rotate in a vertical north–south plane. At this location, mostly of plastic, compute an order-of-magnitude esti- a dip needle makes an angle of 13.08 from the vertical. mate for the magnetic field at this location produced What is the total magnitude of the Earth’s magnetic by the current when you switch on the car’s headlights. field at this location? (b) How does this estimate compare with the Earth’s 59. A very large parallel-plate capacitor has uniform magnetic field? S charge per unit area 1s on the upper plate and 2s 54. Why is the following situation impossible? The magnitude on the lower plate. The plates are horizontal, and both of the Earth’s magnetic field at either pole is approxi- move horizontally with speed v to the right. (a) What mately 7.00 3 1025 T. Suppose the field fades away to is the magnetic field between the plates? (b) What is zero before its next reversal. Several scientists propose the magnetic field just above or just below the plates? plans for artificially generating a replacement mag- (c) What are the magnitude and direction of the mag- netic field to assist with devices that depend on the netic force per unit area on the upper plate? (d) At presence of the field. The plan that is selected is to lay what extrapolated speed v will the magnetic force on a a copper wire around the equator and supply it with a plate balance the electric force on the plate? Suggestion: current that would generate a magnetic field of magni- Use Ampere’s law and choose a path that closes tude 7.00 3 1025 T at the poles.