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科学通报  2011 

南黄海中部泥质区ZY2孔6200年以来的海表温度记录及黄海暖流变化的影响

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Keywords: 南黄海,U37K′,海水表层温度,黄海暖流,黑潮,气候变化

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Abstract:

利用长链烯酮不饱和比值(U37K′)重建了黄海暖流途经的南黄海中部泥质区ZY2孔6.2calkaBP以来的海水表层温度(SST).SST变化范围为14.1~16.5℃,平均15.6℃,分为3个阶段6.2~5.9calkaBP较高,5.9~2.3calkaBP较低且波动大,2.3calkaBP以来较高且较稳定.SST的记录与黑潮强弱的变化相似,对全球气候变冷事件有良好响应,但各阶段的响应幅度差异显著黑潮影响强盛期SST对全球变冷事件响应弱,黑潮影响衰弱期响应强.响应幅度差异与黄海暖流作为黑潮陆架支流和冬季风诱导的补偿流的调节机制有关,黄海暖流带来的暖水将缓冲气候变冷所引起的SST降低,黑潮和东亚冬季风二者均起重要作用.SST的波动具有1482a的周期,该周期在黑潮波动中以及格陵兰冰芯、北大西洋和阿拉伯海沉积物中同样存在,显示了南黄海中部SST变化与黑潮的对应性及中国东部陆架海洋环境对全球海洋环境变化的响应.

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