Spatial and temporal variability of sea surface temperatures and monsoon dynamics in the northwestern Arabian Sea during the last 43 kyr

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Jan Maier, Nicole Burdanowitz, Gerhard Schmiedl, Birgit Gaye
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Abstract

Abstract. In this study, we present the first well-dated, high-resolution alkenone-based sea surface temperature (SST) record (SL167) from the northeastern Oman Margin (Gulf of Oman) in the northwestern Arabian Sea. The SST reconstructions spanning the last 43 kyr reveal fluctuations of approximately 7 °C (20.1 °C to 27.4 °C) and demonstrate a higher sensitivity to climate variations compared to similar core locations in the Arabian Sea. SSTs remained low during Heinrich events (H2, H3, H4), the Younger Dryas, early and late Holocene, and were high during Dansgaard-Oeschger interstadials (D-O 11, D-O 4 - 9, Bølling-Allerød (B-A), and mid-Holocene. SST was predominantly influenced by the SW monsoon during warmer periods and the NE monsoon during cold intervals. The dynamics of strengthening and weakening monsoon periods were likely controlled by shifts in the Intertropical Convergence Zone prompted by changes in solar radiation in the Northern Hemisphere. The last glacial maximum exhibited no intense cooling probably due to stronger NW winds and an eastward shift of the SST gradient in the Gulf of Oman, resulting in a brief and moderate cooling period. Strong SW winds during the early Holocene transported cold water masses from Oman upwelling into the Gulf of Oman, lowering SSTs. A rapid temperature increase of approx. 2 °C during the mid-Holocene was induced by an abrupt eastward shift of the SST gradient.
过去 43 千年阿拉伯海西北部海面温度和季风动态的时空变化
摘要在这项研究中,我们首次展示了阿拉伯海西北部阿曼边缘(阿曼湾)东北部的高分辨率海表温度(SST)记录(SL167)。过去 43 千年的海表温度重建显示,海表温度波动约为 7 ℃(20.1 ℃ 至 27.4 ℃),与阿拉伯海的类似岩芯位置相比,海表温度对气候变迁的敏感性更高。在海因里希事件(H2、H3、H4)、小干 旱期、全新世早期和晚期,海温一直较低,而在丹斯加德-奥斯切尔间期(D-O 11、D-O 4 - 9、博林-阿勒罗德(B-A)和全新世中期,海温较高。在温暖时期,海温主要受西南季风的影响,而在寒冷时期则受东北季风的影响。季风加强和减弱的动态可能受北半球太阳辐射变化引起的热带辐合带移动的控制。上一个冰川极盛时期没有出现剧烈的降温,这可能是由于西北风增强以及阿曼湾的海温梯度东移,导致了短暂而温和的降温期。全新世早期的强西南风将冷水团从阿曼上升流输送到阿曼湾,降低了海温。全新世中期,海温梯度突然东移,导致气温迅速上升约 2 ℃。
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来源期刊
Climate of The Past
Climate of The Past 地学-气象与大气科学
CiteScore
7.40
自引率
14.00%
发文量
120
审稿时长
4-8 weeks
期刊介绍: Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.
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