- 行业: Weather
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
1. With respect to radiation, a single point in space emitting radiation. The radiation from such a source may be expressed as flux per unit solid angle (W sr<sup>−1</sup>). 2. In experimental studies of atmospheric turbulence and diffusion, a source of particulate matter from a single fixed point. There are continuous and instantaneous point sources. The analogous concepts of line source and plane source are also frequently encountered. 3. In hydrodynamics, a source of mass, that is, a singular point in the field where the equation of continuity fails.
Industry:Weather
「予想」が 1 つ一連の気象の不測の事態の可能性に基づいて選択されます。ランダムな予報しばしば別の予測手法の習熟度を決定する比較の基準として使用されます。比較の持続予報、確率の予測します。
Industry:Weather
2 × 2 マトリックスから成る 4 信号振幅を偏光基盤の面でターゲットから散乱を特徴付けます。基礎は 2 つの直交ベクトルによって定義されるたとえば、水平方向と垂直方向または右と左円形。対角項が 2 つ送信偏波に対応する copolarized 信号の振幅および非対角用語、交差偏波信号の振幅。各用語は送信および受信した偏波を表す二重の添字を運ぶ。共分散行列を比較します。
Industry:Weather
アロフト ラジオゾンデを運ぶに使用される気球。ラジオゾンデ風船パイロット風船や天井風船より大きいは、水素やヘリウム、リフトを達成し、夜に昼間の約 30 キロ、25 キロの高度でバーストで一般に満ちています。
Industry:Weather
50 ° ～ 70 ° 緯度の平均である低圧のバンド。北半球、アリューシャン低気圧とアイスランド低のこのベルトで構成されます。南北両半球で南極大陸の周囲に存在になっています。
Industry:Weather
A band of relatively strong winds concentrated between 20° and 40° latitude in the middle and upper troposphere. It can be present at any longitude but is generally strongest off the Asian coast. See jet stream.
Industry:Weather
A belt of trees and/or shrubs arranged as a protection against strong winds; a type of windbreak. The trees may be specially planted or left standing when the original forest is cut. A shelterbelt decreases the force of the wind near the ground, both upwind for a distance of up to six times the height of the barrier, and downwind for a distance of fifteen to twenty times the height. These ratios are roughly constant, irrespective of the height of the belt. The lowest wind speed is found downwind at a distance of three or four times the height of the belt. If the trees are too dense, the air beyond this quiet zone is often turbulent, with downdrafts that may flatten crops. The best form is a moderately dense belt of mixed conifers and deciduous trees, five to ten yards wide, containing at least three rows of trees at right angles to the prevailing winds. A system of shelterbelts to give protection to crops over a large area should be planted at intervals of about twenty-five times their expected height.
Industry:Weather
A body of (often temporarily) stored water, generally of moderate dimensions, supported by a relatively impermeable stratum, and located between a water table and the ground surface.
Industry:Weather
