秋季巴伦支海海温异常对冬季我国渤海冰情的可能影响

发布时间：2018-01-01 08:04

本文关键词：秋季巴伦支海海温异常对冬季我国渤海冰情的可能影响　出处：《海洋学报》2016年03期 　论文类型：期刊论文

【摘要】：本文利用美国NCEP/NCAR逐月的再分析资料、HadISST海温、中国160台站气温和反映渤海冰情轻重的渤海冰情等级资料,研究了前秋巴伦支海海温异常对后期渤海冰情和东亚冬季风的影响,并对相关的物理过程进行分析。结果表明,前秋巴伦支海关键区海温与该区域海冰密集度呈显著的负相关,且具有较好的持续性,通过调节随后冬季向大气释放的热通量,引起后期环流变化。偏高(偏低)年冬季亚洲纬向环流偏弱(偏强),东亚大槽加深(减弱),东亚冬季风加强(减弱),我国东北、华北及西北地区地区显著偏冷(偏暖),这与冬季渤海海冰异常的强度和范围都偏大(小)及与之相联系的环流异常相一致。进一步的分析揭示了联系上游关键区海温变化与后期东亚地区气候异常的重要途径,前秋巴伦支海海温偏高会导致200hPa高度场形成一个自西向东的波列形式,在东亚局地Hadley环流异常的作用下,加强了我国北方地区地表的北风异常。因此,前秋巴伦支海海温异常可以作为冬季渤海冰情的预报因子。
[Abstract]:In this paper, the NCEP/NCAR monthly reanalysis data are used to analyze the sea surface temperature, the temperature of 160 stations in China and the ice level data of Bohai Sea reflecting the ice situation in the Bohai Sea. The effects of sea surface temperature anomalies in the pre-autumn Barents Sea on the ice conditions in the late Bohai Sea and the East Asian Winter Monsoon are studied, and the related physical processes are analyzed. The sea surface temperature in the key area of the Barents Sea before autumn is negatively correlated with the sea ice concentration and has a good persistence by regulating the heat flux released to the atmosphere in the subsequent winter. The Asian zonal circulation is weak (strong), the East Asian trough deepens (weakens), the East Asian winter monsoon strengthens (weakens) and the northeast of China is strengthened in the high (low) winter. In North China and Northwest China, it is obviously cold (warm). This is related to the large intensity and range of sea ice anomaly in the Bohai Sea in winter. Further analysis reveals an important way to link the SST variation in the upstream key area with the late East Asian climate anomaly. The high SST in the Barents Sea before autumn will result in the formation of a wave train form from west to east in the 200hPa height field under the action of the local Hadley circulation anomaly in East Asia. Therefore, the sea surface temperature anomaly in the Barents Sea before autumn can be used as a predictor of the ice situation in the Bohai Sea in winter.
【作者单位】：国家海洋环境预报中心;
【基金】：国家自然科学基金青年基金项目(41206186) 海洋国际合作及履约《中芬海冰与北极气候变化合作研究》极地专项《南极周边海域气象环境综合分析与评价》(CHINAER 2013-04-01)
【分类号】：P731.1
【正文快照】： 1引言渤海位于37°07′~41°0′N,117°35′~121°10′E,每年冬天都会发生海水结冰现象。渤海海冰严重制约着冬季沿海港口的航运以及海上石油开发等,是我国重要的海洋灾害之一[1—2]。由于渤海是一个半封闭的内陆海,受外海的影响相对较小,其特殊的地理位置使得渤海海冰的变化

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