Relationship between persistent heavy rain events in the Huaihe River valley and the distribution pattern of convective activities in the tropical western Pacific warm pool
Relationship between persistent heavy rain events in the Huaihe River valley and the distribution pattern of convective activities in the tropical western Pacific warm pool
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DOI：
10.1007/s00376-008-0329-5
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发表时间：
2008-03
影响因子：
5.8
通讯作者：
Bao Ming
中科院分区：
文献类型：
--
作者：
Bao Ming
利用美国国家海洋和大气管理局(NOAA)和国家环境预报中心/国家大气研究中心(NCEP/NCAR)1979—2006年位势高度场再分析数据的逐日出射长波辐射(OLR)数据，淮河流域(HRV)持续性暴雨事件(PHRE)与热带西太平洋暖池(WPWP)对流活动分布格局的关系为调查了。根据HRV内的9个PHRE实例，西太平洋副热带高压的共同特征表明，副热带北缘继续位于HRV内，与副热带对流活动持续的“北弱南强”分布格局有关。 OLR 主导循环的综合分析表明，副高对 OLR 异常模式的响应滞后约 1-2 天。为了解释副高对流活动分布格局对HRV中副高持续北缘影响的原因，将长江流域4次典型的持续性大、小雨事件与HRV中的PHRE进行对比。对比表明，当整个长江流域对流活动异常分布呈弱（强）分布时，长江流域易发生持续性大（小）雨。当WPWP对流活动异常呈“北弱南强”分布格局时，HRV地区易发生持续性暴雨。对流活动“北弱南强”的分布格局对 HRV PHRE 的影响在季节平均时间尺度上并不明显，这可能是由于 WPWP 对流活动处于非极端状态。
Using daily outgoing long-wave radiation (OLR) data from the National Oceanic and Atmospheric Administration (NOAA) and the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data of geopotential height fields for 1979–2006, the relationship between persistent heavy rain events (PHREs) in the Huaihe River valley (HRV) and the distribution pattern of convective activity in the tropical western Pacific warm pool (WPWP) is investigated. Based on nine cases of PHREs in the HRV, common characteristics of the West Pacific subtropical high (WPSH) show that the northern edge of the WPSH continues to lie in the HRV and is associated with the persistent “north weak south strong” distribution pattern of convective activities in the WPWP. Composite analysis of OLR leading the circulation indicates that the response of the WPSH to OLR anomaly patterns lags by about 1–2 days. In order to explain the reason for the effects of the distribution pattern of convective activities in the WPWP on the persistent northern edge of the WPSH in the HRV, four typical persistent heavy and light rain events in the Yangtze River valley (YRV) are contrasted with the PHREs in the HRV. The comparison indicates that when the distribution pattern of the convective activities anomaly behaves in a weak (strong) manner across the whole WPWP, persistent heavy (light) rain tends to occur in the YRV. When the distribution pattern of the convective activities anomaly behaves according to the “north weak south strong” pattern in the WPWP, persistent heavy rain tends to occur in the HRV. The effects of the “north weak south strong” distribution pattern of convective activities on PHREs in the HRV are not obvious over the seasonal mean timescale, perhaps due to the non-extreme status of convective activities in the WPWP.