古海洋、古气候研究的新工具——分子温度计

doi:10.11867/j.issn.1001-8166.1996.04.0404

地球科学进展 ›› 1996, Vol. 11 ›› Issue (4): 404 -408. doi: 10.11867/j.issn.1001-8166.1996.04.0404

陈建芳，郑连福

国家海洋局第二海洋研究所杭州 310012

收稿日期:1995-09-25 修回日期:1995-12-26 出版日期:1996-07-01
通讯作者: 陈建芳,男,1968年9月出生,助理研究员,主要从事海洋有机地球化学与古海洋研究。
基金资助:
中德政府间海洋科技合作项目“南海海洋沉积作用过程与地球化学研究”。

MOLECULAR THERMOMETER:A NEW TOOL FOR STUDIES OF PALEOCEANOGRAPHY AND PALEOCLIMATE

Chen Jianfang, Zheng Lianfu

Second Institute of Oceanography, SOA, Hangzhou 310012

Received:1995-09-25 Revised:1995-12-26 Online:1996-07-01 Published:1996-07-01

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“分子温度计”是通过有机地球化学方法获得的沉积物中烯酮化合物的相对丰度来估算古海水表面温度的。烯酮化合物的不饱和度（U^ｋ₃₇）与其生物母源Emiliania huxleyi的生长温度密切相关，同时这种信息不受有机质溶解与成岩作用影响，而能较完整地保存于海洋沉积物中，因而通过它能很好地反映古海洋与古气候的演变。这种方法不受盐度、上升流与极地冰盖变化等因素影响，尤其适用于碳酸盐贫乏海区的古海洋与古气候研究。

关键词: 海洋沉积物, 烯酮化合物不饱和度(U^k₃₇), 古海水表面温度, 古海洋, 古气候

Molecular thermometer, known as U^k₃₇ index, is used to estimate sea surface temperature (SST) based on unsaturation ration of long chain ketone in marine sediments. The production ratio of alkenones of the oceanic coccolithophrid Emiliania hyxleyi is linarly correlated with their growth temperature, and there is no alteration for this ratio during sedimentation and burial, so it is a good indicator for studies of paleoceanography and paleoclimate. This method is not affected by salinity, upwilling and polar ice volumn, so it extends the range of paleoclimatic studies to regions with carbonate poor sediments where any foraminiferal analyses are not possible.

Key words: Marine sediments, Unsaturation ratio of ketones (U^k₃₇), Sea surface temperature(SST), Paleoceanography, Paleoclimate

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