Coccolith assemblages and their response to climate and surface hydrography in the Yellow Sea,Northwest Pacific,AD 1780–2011 |
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作者姓名: | 苑明莉 黄建生 孙军 孙耀 |
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作者单位: | 天津科技大学, 海洋与环境学院, 天津 300222, 中国;中国水产科学研究院, 黄海水产研究所, 青岛 266071, 中国,中国水产科学研究院, 黄海水产研究所, 青岛 266071, 中国;海洋与地球学院, 厦门大学, 厦门 361005, 中国,天津科技大学, 海洋与环境学院, 天津 300222, 中国,中国水产科学研究院, 黄海水产研究所, 青岛 266071, 中国 |
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基金项目: | 广东省自然科学基金资助项目(2014A030310232,2014A030310220);中央级公益性科研院所基本科研业务费专项资金项目(中国水产科学研究院南海水产研究所)(2014TS02);国家科技支撑计划课题(2013BAD13B06);广东省省级科技计划项目(2014A020217011) |
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摘 要: | A study of coccolith assemblages from a box core from the central South Yellow Sea(SYS) was performed revealing fluctuations on their relative abundance(%) that can be related to climatic and hydrographic changes over the last 230 years(1780–2011). Total coccolith abundances ranged from 7.0 to 55.1×10~6 coccoliths·g~(-1)sediment. Although the abundance of different species varied widely throughout the core, seven taxa dominated the assemblage. Among these species, Gephyrocapsa oceanica was the most dominant species, and it showed an average percentage of 50.1%. The pattern of G. oceanica(eutrophic species) was opposite to that of the combined percentage of Braarudosphaera bigelowii and Umbilicosphaera sibogae(both oligotrophic species), indicating that in the Yellow Sea(YS), the distribution pattern of G. oceanica might be characteristic of nutrient availability.Similar patterns between G. oceanica and the Siberian High were observed on an inter-decadal time scale,indicating that the East Asian Winter Monsoon(EAWM) may be an important driver of ecological changes in the YS. When the EAWM prevails, both the Yellow Sea Coastal Current(YSCC) and Yellow Sea Warm Current(YSWC)strengthen, and the increasing nutrient availability and warmer water brought by the strengthened YSWC favor eutrophic and warm-water coccolithophore species, such as G. oceanica. This likely mechanism demonstrates that coccolith assemblages can be used as benign and reliable proxy for climate change and surface oceanography.
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关 键 词: | 颗石粒 黄海 古海洋学 东亚冬季风 海流 |
收稿时间: | 2015-09-23 |
修稿时间: | 2016-05-03 |
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