Variability of Northeast China river break-up date
Variability of Northeast China river break-up date
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DOI：
10.1007/s00376-009-9035-1
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发表时间：
2009-07
影响因子：
5.8
通讯作者：
Huijun Wang;Jianqi Sun
中科院分区：
文献类型：
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作者：
Huijun Wang;Jianqi Sun
本文研究了东北中国地区1957-2005年冰封期河流解体日期的变化，并探讨了一些可能的解释机制。结果表明，与1971-1987年相比，-2005年黑龙江和松花江两条主要河流的决口时间提前了4d，封冻时间推迟了4-7d。这种年代际变化与过去50年的气候变暖趋势明显相关。此外，解冻日期具有较大的年际变异性，标准差在10-15天左右。解体日期主要由西伯利亚-东北中国地区1-2月-3月的平均地面气温通过冰盖上融化速度、冰层厚度和积雪的变化来确定。解体日期的年际变化与北环型(NAM)也有显著的相关性，相关系数为0.35~0.55。这种关系是由于北方涛动对1-2-3月东亚冬季风环流和西伯利亚-东北中国地面气温的调节作用所致。
This paper investigates the variability of the break-up dates of the rivers in Northeast China from their icebound states for the period of 1957–2005 and explores some potential explanatory mechanisms. Results show that the break-up of the two major rivers (the Heilongjiang River and Songhuajiang River) was about four days earlier, and their freeze-up was about 4–7 days delayed, during 1989–2005 as compared to 1971–1987. This interdecadal variation is evidently associated with the warming trend over the past 50 years. In addition, the break-up and freeze-up dates have large interannual variability, with a standard deviation of about 10–15 days. The break-up date is primarily determined by the January-February-March mean surface air temperature over the Siberian-Northeast China region via changes in the melting rate, ice thickness, and snow cover over the ice cover. The interannual variability of the break-up date is also significantly connected with the Northern Annular Mode (NAM), with a correlation coefficient of 0.35–0.55 based on the data from four stations along the two rivers. This relationship is attributed to the fact that the NAM can modulate the East Asian winter monsoon circulation and Siberian-Northeast China surface air temperature in January–February–March.