upper-level ridge 中文意思是什麼
upper-level ridge
解釋
高空脊-
The diagnostic analysis for the sandstorm process on the base of height, temperature, pressure and wind etc output from the model shows that the upper cold trough, low - level wind shear, surface cold anticyclonic ridge, mesoscale cyclone and cold front are the main synoptic systems, surface cold anticyclonic ridge and cold front provide condition of wind force to occurrence of the sandstorm weather, the strong mesoscale cyclone before front makes pressure gradient before and after cold front obviously strengthen, moreover, and it increases obviously the temperature of the controlled area, as a result, the updraft movement caused by convergence before front strengthens
500hpa強鋒區、 700hpa切變和鋒前中尺度系統的強弱及位置變化是沙塵暴天氣發生發展到減弱的直接原因。地面冷高壓、地面氣旋及冷鋒是造成本次沙塵暴天氣的主要地面天氣系統。地面冷高壓及冷鋒為沙塵暴天氣的發生提供了風力條件，而中尺度氣旋使冷鋒前後氣壓梯度明顯增強外，又使所控制的區域增溫明顯，使鋒前輻合上升運動加強，為沙塵暴天氣的發生提供了熱、動力條件。 -
( 2 ) sxsp anomaly is closely related to the abnormity of 500hpa geopotential height field over the east of ural and yakutsk area, western ridge point and area of subtropical high, the cold air abnormity from north of china and the position of upper level westerly jet over east asia
（ 2 ）三峽庫區夏季降水異常與大氣環流異常密切相關：與500hpa烏拉爾山以東高度場異常、雅庫茨克以東高度場異常、副熱帶高壓面積及西伸脊點、北方冷空氣異常、 200hpa東亞高空西風急流位置異常偏南（偏北）密切相關。 -
( 2 ) another interesting phenomenon is founded that the center of south asia high in the upper level of troposphere is stabile and nearly motionless during the processes of the westward extension of western pacific subtropical high, but its eastern ridge strengthens and extends eastward remarkably because of the anticyclone moves westward over the southeast japan, which may lead to the westward extension of subtropical high in the middle level of troposphere. ( 3 ) in the low level of troposphere, the north australia cold air activity plays an important role on the westward extension of subtropical high
（ 2 ）本文在研究副高西伸過程中指出，高層200hpa上日本東南部的高壓併入南亞高壓，導致南亞高壓脊的增強發展，對低層500hpa上副高的加強、西伸可能起到引導的作用；同時，對流層低層850hpa上孟加拉灣槽在副高西伸過程中加深，並在西伸脊點到達最西點的前4天強度達到最強，這為預報西太平洋副高的活動提供了參考。
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