Using the daily snow observation data in 1961-2007 at 68 meteorological stations on the Qinghai-Xizang Plateau(QXP), the variation of spring snow cover day on the QXP and the circulation background of the anomalous spring snow cover year are analyzed, and the spring snow cover impact on the northern hemisphere circulation in summer is revealed. The results show that though in the years when spring snow day are fewer or more than normal, 500 hPa height fields in Eurasia all exhibit the circulation pattern with ‘two trough a ridge’ in the mid-high latitude regions, the position and anomaly extents in the more and less frequency snow cover years are obviously different. In spring, when the Iceland low is strong (weak), the Mongolian high is strong (weak), and the Indian low is weak (strong), the spring snow cover over the QXP is more (less) frequency. Whether for summer circulation in the northern hemisphere or summer climate in China, number of spring snow cover days on the QXP is an important influence signal. It has a close linkage with the main atmospheric activity centers in the northern hemisphere and the main atmospheric circulation systems impacting the climate in China in summer. When spring snow cover is more (less) frequence over the QXP, it appears that in summer the blocking high is more (less) easily developed in East Asia, while the west Pacific subtropical high is less (more) easily to be shifted with southward in the northwest Pacific. Such kind of relationship is an important indicator for short-term climate prediction in China.
TANG Hongyu
,
LI Xifu
,
LI Dongliang
. Contrast of Circulation Pattern Related to More and Less Spring Snow Cover over Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2014
, 33(5)
: 1190
-1196
.
DOI: 10.7522/j.issn.1000-0534.2013.00125
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