Decadal Change in the Correlation Pattern between the Tibetan Plateau Winter Snow and the East Asian Summer Precipitation during 1979-2011
Decadal Change in the Correlation Pattern between the Tibetan Plateau Winter Snow and the East Asian Summer Precipitation during 1979-2011
复制标题
1979-2011年青藏高原冬季积雪与东亚夏季降水相关格局的年代际变化
DOI：
10.1175/jcli-d-12-00587.1
复制
发表时间：
2013-10-01
影响因子：
4.9
通讯作者：
Ding, Yihui
中科院分区：
文献类型：
--
作者：
Si, Dong;Ding, Yihui
观测资料表明，青藏高原冬季降雪与东亚夏季降水的相关性在20世纪90年代末发生了变化。1979-99年间，长江流域和日本南部地区冬季积雪与夏季降水的正相关被年代际气候变化所破坏。相反，在2000-11年间，淮河流域和朝鲜半岛的夏季降水与前期冬季TP上的积雪有很强的正相关。这种增温与地面感热通量和进入大气的长波辐射显著增加有关。后者与地表反照率的降低和前期冬春雪年代际减少所产生的融雪土壤水文效应密切相关。冬季降雪引起的TP增暖，加上热带中、东太平洋海温的降温，加剧了随后EA地区春季和夏季的海陆热力差异，从而导致EA夏季风向北推进。伴随着夏季风的北移，东亚夏季降水带北移。因此，自20世纪90年代末以来，与前期TP冬季降雪相关的EA夏季高降水区已从YRV和日本南部向北转移到HRV和朝鲜半岛。
Observational evidence indicates that the correlation between Tibetan Plateau (TP) winter snow and East Asian (EA) summer precipitation changed in the late 1990s. During the period 1979-99, the positive correlation between the TP winter snow and the summer precipitation along the Yangtze River valley (YRV) and southern Japan was disrupted by the decadal climate shift. In contrast, the summer precipitation over the Huaihe River valley (HRV) and the Korean Peninsula showed a strong positive correlation with the preceding winter snow over the TP during the period 2000-11.The radiosonde temperature measurements over the TP show a pronounced warming since the late 1990s. This warming is associated with the significant increase in surface sensible heat flux and longwave radiation into atmosphere. The latter is closely related to the decrease of surface albedo and the soil hydrological effect of melting snow due to the decadal decrease in the preceding winter and spring snow over the TP. The TP warming induced by the decrease in winter snow, together with the cooling of the sea surface temperature in the tropical central and eastern Pacific, intensifies the land-sea thermal contrast in the subsequent spring and summer over EA, thus causing a northward advance of the EA summer monsoon. Accompanying the northward migration of the summer monsoon, the summer precipitation belt over EA shifts northward. Consequently, the high summer precipitation region over EA correlating with the preceding winter snow over the TP has shifted northward from the YRV and southern Japan to the HRV and the Korean Peninsula since the late 1990s.