新的高原季風(fēng)指數(shù)與四川盆地夏季降水的關(guān)系

doi:10.3969/2012jms.00**

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新的高原季風(fēng)指數(shù)與四川盆地夏季降水的關(guān)系
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                        10.3969/2012jms.00**
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金（40375031）

Relationship between a new plateau monsoon index and summer precipitation in Sichuan basin

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摘要:

用NCEP/NCAR逐月再分析資料和中國(guó)560站月降水資料，定義了一個(gè)高原季風(fēng)指數(shù)I(xiàn)PM2。結(jié)果表明：與原有高原季風(fēng)指數(shù)相比，該指數(shù)與四川盆地夏季降水的相關(guān)性更好，能夠較好地反映四川盆地夏季降水的異常變化。當(dāng)高原夏季風(fēng)偏弱時(shí)，巴爾喀什湖至貝加爾湖低壓槽、亞洲東岸高壓脊、印度低壓均加強(qiáng)，同時(shí)西太平洋副熱帶高壓偏北，來(lái)自孟加拉灣的西南風(fēng)水汽輸送和源于西太平洋的偏南風(fēng)水汽輸送均加強(qiáng)，這種環(huán)流形式有利于四川盆地西（東）部夏季降水偏多（少）；當(dāng)高原夏季風(fēng)偏強(qiáng)時(shí)，情況相反。I(xiàn)PM2弱（強(qiáng)）大(小)年與四川盆地西（東）部澇年環(huán)流背景相似，表明I(xiàn)PM2能夠很好反映四川盆地夏季降水異常的環(huán)流場(chǎng)特征。

Abstract:

Based on monthly NCEP/NCAR reanalysis and precipitation of 560 stations in China, a new plateau monsoon index I(xiàn)PM2 is defined, and its characteristics, advantages, characteristics of anomalies and its effect on summer precipitation in Sichuan basin are analyzed. The results show that: compared to the original plateau monsoon index, I(xiàn)PM2 has a better correlation with the summer precipitation in Sichuan basin and can reflect the change of summer precipitation in Sichuan basin better. In the weak index years of I(xiàn)PM2, the low trough between Balkhash and Baykal, the ridge located in the east coast of Asia and the Indian low all strengthened, the subtropical high appeared more northward than usually, the southwesterly water vapor transport from the of Bengal and southerly water vapor transport originated from West Pacific Ocean strengthened, all these are favorable to a lot of rain in the west Sichuan basin and little rain in the east. In the strong index years of I(xiàn)PM2, the situation is opposite. The overall circulation background of I(xiàn)PM2 weak (strong) index years and flood years in West (East) basin are basically consistent, which shows that I(xiàn)PM2 can reflect characteristics of summer precipitation anomalies in Sichuan basin very well

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田俊,馬振峰,范廣洲,陳小婷.新的高原季風(fēng)指數(shù)與四川盆地夏季降水的關(guān)系.氣象科學(xué),2010,(3):308-315 Tian Jun, Ma Zhenfeng, Fan Guangzhou, Chen Xiaoting. Relationship between a new plateau monsoon index and summer precipitation in Sichuan basin. Journal of the Meteorological Sciences,2010,(3):308-315

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收稿日期:2009-06-12
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