南亞和東亞熱帶夏季風(fēng)強(qiáng)弱不同配置及其對(duì)中國(guó)夏季降水的影響

doi:10.12306/2022jms.0058

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南亞和東亞熱帶夏季風(fēng)強(qiáng)弱不同配置及其對(duì)中國(guó)夏季降水的影響
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                        10.12306/2022jms.0058
                    
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中圖分類(lèi)號(hào):P448
基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(42192512)

Different configurations of interannual variation between East Asian tropical summer monsoon and South Asian summer monsoon and the impact on China summer rainfall

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摘要:

利用NOAA向外長(zhǎng)波輻射(OLR)、NCEP/NCAR再分析資料和CN05.1降水資料,研究了南亞和東亞熱帶夏季風(fēng)強(qiáng)度年際變化關(guān)系,及其強(qiáng)弱不同配置對(duì)中國(guó)夏季降水的影響。結(jié)果表明:南亞和東亞熱帶夏季風(fēng)強(qiáng)度變化之間存在同相和反相兩種配置,定義的強(qiáng)度同相和反相變化指數(shù)可以很好地表征該關(guān)系。同相變化模態(tài)可能與海溫異常時(shí)的強(qiáng)El Niño(La Niña)影響有關(guān),其反相變化模態(tài)受El Niño(La Niña)以及印度洋海盆一致模的影響,同時(shí)西太平洋副熱帶高壓和伊朗高壓位置東西偏移和強(qiáng)度變化也影響著不同配置的出現(xiàn)。兩者不同配置時(shí),對(duì)中國(guó)夏季降水的影響不同。當(dāng)變化呈同相偏強(qiáng)時(shí),夏季中國(guó)東部地區(qū)降水為"中間少南北多"的雨型。當(dāng)變化呈反相,東亞熱帶夏季風(fēng)偏強(qiáng)南亞夏季風(fēng)偏弱時(shí),夏季中國(guó)東部地區(qū)降水為"一致偏少"雨型。

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By using the monthly averages of Outgoing Longwave Radiation (OLR) data from National Oceanic and Atmospheric Administration (NOAA), NCEP-NCAR reanalysis dataset, and CN05.1 daily precipitation dataset, the relationship of interannual variation between East Asian Tropical Summer Monsoon (EATSM)and South Asian Summer Monsoon(SASM) was analyzed, and the impact of different strength change configurations on China summer rainfall was investigated. Results show that: there are two configurations with in-phase and out-of-phase variations between the intensity of EATSM and SASM. The identical and inverse intensity change indices are defined, and they can represent the relationship well. The in-phase mode may be related to the influence of the strong El Niño (La Niña), and the antiphase mode may be influenced by El Niño (La Niña) and Indian Ocean Basin-wide. At the same time, the east-west deviation and intensity variation of the WPSH and the Iran High also affect the appearance of different configurations. When the intensity of EATSM and SASM changes in different configurations, the effects on China summer rainfall are different. When EATSM and SASM are stronger, the rainy model of summer rainfall in the eastern part shows "less in the middle, more in the south and north". When the intensity of EATSM and SASM changes in out-of-phase, with stronger East Asia tropical summer monsoon and weaker South Asia summer monsoon, the precipitation in eastern China shows in consistently less rainy pattern.

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顧元華,郭品文,胡景高,郭棟.南亞和東亞熱帶夏季風(fēng)強(qiáng)弱不同配置及其對(duì)中國(guó)夏季降水的影響.氣象科學(xué),2023,43(1):15-24 GU Yuanhua, GUO Pinwen, HU Jinggao, GUO Dong. Different configurations of interannual variation between East Asian tropical summer monsoon and South Asian summer monsoon and the impact on China summer rainfall. Journal of the Meteorological Sciences,2023,43(1):15-24

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收稿日期:2022-04-21
最后修改日期:2022-05-25
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在線發(fā)布日期: 2023-05-15
出版日期: 2023-02-15

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