刘胜胜,周顺武,吴萍,孙阳,谢洁宏,李可. 2021. 青藏高原东部冬季降水对北极涛动异常的响应[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.034
青藏高原东部冬季降水对北极涛动异常的响应
Response of winter precipitation in eastern Tibetan Plateau to Arctic Oscillation
投稿时间:2021-01-01  修订日期:2021-03-07
DOI:10.11676/qxxb2021.034
中文关键词:  北极涛动,高原东部,冬季降水,东亚季风,南支槽,地形
英文关键词:AO, eastern TP, East Asian winter monsoon, Southern Branch Trough, Topography
基金项目:国家自然科学基金,第二次青藏高原综合科学考察研究项目
作者单位邮编
刘胜胜 1南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/资料同化研究与应用中心2西藏自治区气象台 210044
周顺武 南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/资料同化研究与应用中心 210044
吴萍 国家气候中心 100081
孙阳 南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/资料同化研究与应用中心 210044
谢洁宏 南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/资料同化研究与应用中心 210044
李可 南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/资料同化研究与应用中心 210044
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中文摘要:
      基于1979—2015年中国区域CN05.1格点降水以及全球降水气候中心(GPCC)降水数据等资料,采用回归、合成分析等方法,分析了青藏高原东部(简称高原)冬季降水的南北区域性差异及其年际变化对北极涛动(AO)异常的响应。结果表明:(1)高原北部和南部冬季降水都与AO异常存在密切的关系,但高原北部和南部冬季降水在年际变化并不一致,两地冬季降水对AO异常响应的机理也不同。(2)高原北部冬季降水变化主要和东亚冬季风有关,AO正(负)异常时东亚冬季风减弱(增强),高原北部对流层各层均为东南(西北)风距平,有(不)利于西太平洋的水汽进入高原北部,导致北部降水增加(减弱)。(3)高原南部冬季降水变化主要和南支槽有关,AO正(负)异常时南支槽加强(减弱),有(不)利于自孟加拉湾的水汽北上高原,低层辐合(散)高层辐散(合),上升(下沉)运动增强,导致南部降水增加(减弱)。简言之,AO通过影响东亚冬季风(南支槽),进而影响高原北(南)部冬季降水,但AO负异常对高原冬季降水的影响比AO正异常的影响更加显著。
英文摘要:
      In this study, using the China gauge-based monthly gridded data (CN05.1) and the precipitation dataset provided by the Global Precipitation Climatic Center (GPCC) from 1979 to 2015, the regional differences of precipitation between north and south over the Tibetan Plateau (hereinafter referred to as the TP) and the response of its interannual variation to the Arctic Oscillation (AO) anomalies were analyzed with the methods of regression, composite analysis and so on. The results indicate that there exists a close relationship between the winter precipitation over the north and south of the TP and the AO, however, it is not consistent in the terms of the inter-annual variation of precipitation in the north and south over the TP as well as the response mechanism of the two regions of the TP to AO anomaly. Besides, the main synoptic influential systems of the winter precipitation over the north and south of the TP are different. The variation of winter precipitation in the northern TP was mainly related to the East Asian winter monsoon that weakened (strengthened) accompanied with the southeast (northwest) wind anomaly occurred in troposphere layer when the AO was in positive (negative) phase, which was favorable (unfavorable) to the water vapor from the western pacific climbing into the northern part of the TP, leading to the increase (decrease) of precipitation in the northern TP. Whereas, the anomaly of winter precipitation in the southern TP mainly due to the southern branch trough. When the AO was in positive (negative) phase, the southern branch trough reinforced (weakened), which was (was not) conducive to the warm and humid water vapor from the Bay of Bengal to TP and the convergence (divergence) in the lower layers, with the ascending (sinking) motion enhanced, result in increase (decrease) of precipitation in the southern TP. In summary, the response mechanism of the winter precipitation in the north and south over the TP to the AO anomalies were different in that the AO mainly impacted the winter precipitation in north (south) of the TP by affecting the East Asian winter monsoon (southern branch trough), but compared to the AO positive anomaly, the impact of the AO negative anomaly was more significant.
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