青藏高原大氣熱力異常對(duì)西風(fēng)急流的影響

doi:10.3969/2018jms.0018

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青藏高原大氣熱力異常對(duì)西風(fēng)急流的影響
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                        10.3969/2018jms.0018
                    
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中圖分類號(hào):P442
基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目（41175081；91337218；41605039）

Influence of atmospheric heat anomaly over the Tibetan Plateau on the westerly jet

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本文基于NCEP/NCAR月平均再分析資料，分析了對(duì)流層上層200 hPa緯向西風(fēng)的時(shí)空變化特征，并通過(guò)EOF分解得到一個(gè)表征西風(fēng)急流位置的指數(shù)（Westerly Jet Position Index，WJPI）；同時(shí)基于對(duì)流層中上層（500~200 hPa）溫度緯向偏差，構(gòu)建了一個(gè)描述青藏高原（簡(jiǎn)稱高原）大氣熱力特征的指標(biāo)（Plateau Atmosphere Heating Index，PAHI），定量分析了該指數(shù)與西風(fēng)急流位置的關(guān)系。結(jié)果表明：由冬到夏西風(fēng)急流軸不斷北抬西伸，風(fēng)速逐漸減??；各季西風(fēng)急流軸均處于西風(fēng)變率的小值區(qū)，表明各季急流均軸的位置較穩(wěn)定。各季PAHI與200 hPa緯向風(fēng)的顯著正相關(guān)區(qū)均分布在高原北側(cè)，即高原PAHI增強(qiáng)時(shí)，其北側(cè)西風(fēng)增強(qiáng)，南側(cè)西風(fēng)減弱，對(duì)流層上層西風(fēng)急流北移；各季W(wǎng)JPI與PAHI之間均存在顯著相關(guān)，表明PAHI異常對(duì)西風(fēng)急流位置的變化有重要作用。

Abstract:

Based on the NCEP/NCAR reanalysis dataset from 1979 to 2014, the temporal and spatial characteristics of the 200 hPa zonal winds were analyzed. Through the EOF decomposition, an index presenting the Westerly Jet Position Index(WJPI) was obtained, and meanwhile the index describing the Atmospheric Heating over the Tibetan Plateau (PAHI) was also constructed based on the temperature zonal deviation at the upper-middle layer (500-200 hPa) of the troposphere. The relationship between PAHI and the westerly jet position was also quantitatively analyzed. Results show that the westerly jet axis gradually moves northward and westward from winter to summer, with decreasing wind speed. Westerly jet axes are always located in the small value area of the westerly variability in all seasons, suggesting that the jet position is relatively stable in every season. The significant positive correlation areas between PAHI and 200 hPa zonal winds in each season are located in the northern TP, indicating that strong PAHI gives rise to the strengthened westerly over the northern TP and the weakened westerly over the southern TP, and then the westerly jet in the upper tropospheric moves northward. The significant correlations between WJPI and PAHI exist in four seasons, which further demonstrates that PAHI anomaly play an important role in the position changes of the westerly jet.

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單幸,周順武,王美蓉,賁海榮,喬鈺.青藏高原大氣熱力異常對(duì)西風(fēng)急流的影響.氣象科學(xué),2019,39(2):206-213 SHAN Xing, ZHOU Shunwu, WANG Meirong, BEN Hairong, QIAO Yu. Influence of atmospheric heat anomaly over the Tibetan Plateau on the westerly jet. Journal of the Meteorological Sciences,2019,39(2):206-213

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收稿日期:2017-11-10
最后修改日期:2018-02-11
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在線發(fā)布日期: 2019-06-01
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