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冰川冻土  2013 

黄河中下游地区夏季旱涝年低频振荡特征分析

DOI: 10.7522/j.issn.1000-0240.2013.0113, PP. 1007-1014

Keywords: 黄河流域中下游,低频振荡,旱涝

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Abstract:

利用1971-2010年NCEP/NCAR逐日再分析资料和黄河流域67个测站逐日降水资料,对黄河中下游地区旱涝年的低频振荡特征进行了分析.结果表明黄河流域30~60d低频降水呈现区域性分布的特征,大值区位于黄河中下游地区,10~20d低频降水呈现整体性分布.黄河中下游地区旱涝年夏季降水普遍存在10~20d和30~60d的低频振荡,10~20d振荡强度整体上均强于30~60d振荡,10~20d低频振荡在旱涝年差异不显著.涝年30~60d低频振荡较旱年显著,涝年和旱年30~60d低频振荡的传播特征不相同,同时涝年的30~60d低频振荡的传播特征也存在差异.影响涝年30~60d低频降水的主要原因是低纬的低频振荡强度增强向北传播到黄河流域,以及青藏高原热源的低频振荡向东北传播与西太平洋热源的低频振荡向西传播在黄河中下游交汇.正常年份的低频降水主要受低纬低频振荡向北传播的影响.

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