Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917-2004
Coccolithophore response to climate and surface hydrography in Santa Barbara Basin, California, AD 1917-2004
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DOI：
10.5194/bg-6-2025-2009
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发表时间：
2009-01-01
期刊：
影响因子：
4.9
通讯作者：
Beaufort, L.
中科院分区：
文献类型：
--
作者：
Grelaud, M.;Schimmelmann, A.;Beaufort, L.
本文对加州圣巴巴拉盆地（Santa Barbara Basin， SBB）沉积中心公元1917-2004年的不同沉积记录进行了月度至三年一次的分辨率分析，得到了6种球石团的相对丰度，它们至少代表了96%的球石团组合。季节/年相对丰度响应SBB的气候和地表水文条件，其中(i) G. oceanica， H. carteri和F. profunda三个物种是北流温暖的加利福尼亚逆流的特征，（ii） G. ericsonii和G. muellerae两个物种与寒冷的赤道流动的加利福尼亚洋流有关，（iii）和E. huxleyi似乎是SBB特有的。对这些物种相对丰度的光谱分析表明，它们都受到厄尔尼诺-南方涛动（ENSO）和/或太平洋年代际涛动（PDO）的影响。G. oceanica和H. carteri的相对丰度增加与温暖的ENSO事件有关，G. muellerae响应温暖的PDO事件，G. ericsonii的丰度在寒冷的PDO事件中增加。huxleyi、G. muellerae和G. oceanica的形态测量参数表明，从1917年到2004年，SBB地区的球岩石壳碳酸盐质量随着co(2)和海面温度的升高而增加。
The varved sedimentary AD 1917-2004 record from the depositional center of the Santa Barbara Basin (SBB, California) was analyzed with monthly to triannual resolution to yield relative abundances of six coccolithophore species representing at least 96% of the coccolithophore assemblage. Seasonal/annual relative abundances respond to climatic and surface hydrographic conditions in the SBB, whereby (i) the three species G. oceanica, H. carteri and F. profunda are characteristic of the strength of the northward flowing warm California Counter Current, (ii) the two species G. ericsonii and G. muellerae are associated with the cold equatorward flowing California Current, (iii) and E. huxleyi appears to be endemic to the SBB. Spectral analyses on relative abundances of these species show that all are influenced by the El Nino Southern Oscillation (ENSO) and/or by the Pacific Decadal Oscillation (PDO). Increased relative abundances of G. oceanica and H. carteri are associated with warm ENSO events, G. muellerae responds to warm PDO events and the abundance of G. ericsonii increases during cold PDO events. Morphometric parameters measured on E. huxleyi, G. muellerae and G. oceanica indicate increasing coccolithophore shell carbonate mass from similar to 1917 until 2004 concomitant with rising pCO(2) and sea surface temperature in the region of the SBB.