中高緯瞬變渦旋活動(dòng)對(duì)我國東部夏季降水的影響

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中高緯瞬變渦旋活動(dòng)對(duì)我國東部夏季降水的影響
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中圖分類號(hào):P461
基金項(xiàng)目:國家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2022YFF0801702;2022YFE0106600)

The influence of middle-to-high latitude transient eddies on summer precipitation anomalies in eastern China

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基于1981—2020年日本氣象廳(Japanese Meteorological Agency,JMA)再分析資料JRA-55(Japanese 55-year Reanalysis)以及美國國家氣候中心(Climate Prediction Center,CPC)衛(wèi)星降水資料,分析了瞬變渦旋活動(dòng)特征及其對(duì)我國東部夏季降水異常的影響,并對(duì)其可能機(jī)制展開討論。研究表明,蒙古國至我國東北和華北地區(qū)既是瞬變渦旋活動(dòng)的活躍區(qū)域,也是其輸送的大值區(qū)域,其中瞬變渦旋對(duì)熱量和水汽的經(jīng)向輸送占主導(dǎo)地位,是中高緯熱量和水汽的重要來源。根據(jù)瞬變渦旋經(jīng)向熱量和水汽輸送變率的強(qiáng)度確定了瞬變熱量和水汽輸送的關(guān)鍵區(qū)域,分別為(45°~60°N,100°~130°E)和(35°~50°N,100°~120°E),并定義了瞬變熱量和水汽指數(shù),其與我國東部夏季降水異常的回歸結(jié)果表明,瞬變渦旋活動(dòng)對(duì)我國東部夏季降水存在顯著影響。中高緯天氣尺度瞬變渦旋對(duì)熱量、水汽和動(dòng)量的輸送異常,通過波流相互作用過程,對(duì)平均流形成了反饋,導(dǎo)致季節(jié)平均環(huán)流、水汽分布和水汽輸送的異常,從而在熱力、動(dòng)力和水汽條件的共同作用下引起降水異常。

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Based on the reanalysis data JRA-55 (Japanese 55-year Reanalysis) of the Japanese Meteorological Agency (JMA) and the satellite precipitation data of the Climate Prediction Center (CPC) in the United States from 1981 to 2020, the characteristics of transient eddies and their effects on the summer precipitation anomalies in eastern China were analyzed, and the possible mechanisms for these effects were discussed. Results show that the region from Mongolia to Northeast and North China is not only an active region of transient eddies, but also a large value region of transient eddy transport. The meridional transport of heat and moisture that plays a dominant role in the transient eddy transport process, is an important source of heat and moisture in middle-to-high latitude. According to the intensity of the heat and moisture transport variability of the transient eddies, the key regions of the transient heat and moisture transport were identified as (45°-60°N,100°-130°E) and (35°-50°N,100°-120°E), respectively, and the transient heat and moisture indices were defined. The regression results with the summer precipitation anomalies in eastern China show that the transient eddy activities have significant effects on the summer precipitation in eastern China. The anomalies of transport of heat, moisture and momentum by the middle-to-high latitude synoptic scale transient eddies has formed a feedback to the mean flow through the wave-flow interaction process, resulting in anomalies of seasonal mean circulation, moisture distribution and moisture transport, and thus causing precipitation anomalies under the combined influence of thermal, dynamic and moisture conditions.

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王佳怡,房佳蓓,胡海波.中高緯瞬變渦旋活動(dòng)對(duì)我國東部夏季降水的影響.氣象科學(xué),2024,44(2):222-234 WANG Jiayi, FANG Jiabei, HU Haibo. The influence of middle-to-high latitude transient eddies on summer precipitation anomalies in eastern China. Journal of the Meteorological Sciences,2024,44(2):222-234

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收稿日期:2024-01-26
最后修改日期:2024-02-29
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在線發(fā)布日期: 2024-05-17
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