Detrital input, productivity fluctuations, and water mass circulation in the westernmost Mediterranean Sea since the Last Glacial Maximum
Detrital input, productivity fluctuations, and water mass circulation in the westernmost Mediterranean Sea since the Last Glacial Maximum
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DOI：
10.1029/2008gc002096
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发表时间：
2008-11
期刊：
影响因子：
3.7
通讯作者：
F. Jiménez-Espejo;F. Martínez-Ruiz;M. Rogerson;J. González-Donoso;O. Romero;D. Linares;T. Sakamoto;D. Gallego-Torres;J. Rueda Ruiz;M. Ortega‐Huertas;J. A. Perez Claros
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作者：
F. Jiménez-Espejo;F. Martínez-Ruiz;M. Rogerson;J. González-Donoso;O. Romero;D. Linares;T. Sakamoto;D. Gallego-Torres;J. Rueda Ruiz;M. Ortega‐Huertas;J. A. Perez Claros
通过给出海表面温度、碳酸盐氧同位素剖面和岩芯沉积物的整体地球化学组成，我们提供了从末次盛冰期到中全新世（B 20，000 -5000 cal年）的西地中海海洋学的多参数重建。P.）。来自Algero-Balearic盆地的大洋钻探计划站点975的沉积物与三个Alboran盆地岩心（TTR-300 G，TTR-302 G和TTR-304 G）进行了比较，所有这些都是在高分辨率下进行的。这种多代理方法允许识别两种不同的循环模式：（1）在LGM期间和从2.8.0 cal. ka B开始。P.以后，δ 18 OG无表面梯度。bulloides被发现与低生产力有关，与现代条件非常相似;（2）在Bølling-Allerød和全新世早期，发现了显着的表面同位素梯度，其周期可能表明不稳定的水柱，与生产力提高和低底部氧条件有关。表面同位素偏移和有机富层形成的发生之间的密切同步暗示，这些功能的起源是联系在一起的，可能是通过变浅的区域温盐环流。古SST，来自南极有孔虫组合，表明在分析的时间间隔内，地表条件的突然变化。基于Ba和总有机碳的海洋生产力波动与水柱稳定性和大气条件有关。一个急剧变暖和δ 18 OG。在新仙女木期结束时的bulloides漂移可能与冰川融水的影响有关。河流输入已重建使用镁/铝比，镁/铝峰值在干旱时期（格陵兰Stadial-2a和新仙女木）有关的“旁路”边缘过程。
By presenting sea surface temperatures, planktonic oxygen isotope profiles, and bulk geochemical composition of core sediments, we offer a multiparameter reconstruction of Western Mediterranean oceanography from the Last Glacial Maximum until the Middle Holocene (20,000–5000 cal years B. P.). Sediments from Ocean Drilling Program Site 975 in the Algero‐Balearic basin have been compared with three Alboran basin cores (TTR‐300G, TTR‐302G, and TTR‐304G), all of them investigated at high resolution. This multiproxy approach has allowed two different modes of circulation to be recognized: (1) during the LGM and from ∼8.0 cal. ka B. P. onward, no surface gradient in δ18OG. bulloides is found associated with low productivity, in close analogy to modern conditions; (2) during the Bølling‐Allerød and early Holocene, significant surface isotopic gradients are found with periods probably indicating an unstable water column, associated with enhanced productivity and low bottom oxygen conditions. The close synchrony between the occurrence of the surface isotopic offset and organic rich layer formation implicates that the origin of these features is linked, probably via shoaling of the regional thermohaline circulation. Paleo‐SSTs, derived from planktonic foraminifer assemblages, indicate abrupt changes in surface conditions during the analyzed time interval. Fluctuations in marine productivity based on Ba and total organic carbon are related to water column stability and atmospheric conditions. A sharp warming and δ18OG. bulloides excursion at the end of the Younger Dryas is probably linked to glacial meltwater influence. The riverine input has been reconstructed using the Mg/Al ratio, and Mg/Al peaks during arid periods (Greenland Stadial‐2a and Younger Dryas) related to “bypass” margin processes.