Millennial scale sea surface temperatures of the western Arabian Sea between 37–67 ka BP

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Jennifer Scott, Douglas Coenen, Simon Jung
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Abstract

Abstract. The Asian monsoon system is a crucial part of the global climate system affecting a significant proportion of the world population. Understanding the controls for changes in the monsoon system is crucial for meaningful assessments of future climate change. The Arabian Sea is part of the wider Asian monsoon system and has been studied regarding controls of monsoon variability through time. In this study we present sea surface temperature data from 37–67 ka BP from sediment core NIOP 929 from the western Arabian Sea assessing the importance of northern/southern hemispheric climate change driving monsoon circulation in the Arabian Sea. Earlier work implies a straightforward link between monsoon variation in the Arabian Sea and northern hemisphere millennial scale climate change during glacial periods, as depicted in Greenland ice cores. We present a new millennial-scale Mg/Ca based sea surface temperature reconstruction based on the planktic foraminifera species G. bulloides and G. ruber. We use these data to calculate seasonal sea surface temperatures. The SST data are variable with a maximum short-term change of 8–9 °C. The variations in our SST records appear not related to change in either hemisphere in a straightforward fashion by not showing a phase-locked relation to millennial scale change in Greenland or Antarctic ice core records. We discuss these changes in the context of the Arabian Sea potentially being a “melting pot” with both the northern and the southern hemisphere exerting influence on a seasonal scale.
公元前 37-67 千年阿拉伯海西部的千年尺度海面温度
摘要亚洲季风系统是全球气候系统的重要组成部分,影响着世界上很大一部分人口。了解季风系统变化的控制因素对于对未来气候变化进行有意义的评估至关重要。阿拉伯海是更广泛的亚洲季风系统的一部分,人们一直在研究季风变化的控制因素。在这项研究中,我们展示了来自阿拉伯海西部沉积岩芯 NIOP 929 的公元前 37-67 ka 年的海面温度数据,评估了北半球/南半球气候变化对阿拉伯海季风环流的重要影响。早先的研究表明,阿拉伯海季风变化与北半球冰川期千年尺度气候变化之间存在直接联系,格陵兰冰芯中就有描述。我们根据浮游有孔虫物种 G. bulloides 和 G. ruber,提出了一种新的基于镁/钙的千年尺度海面温度重建方法。我们利用这些数据来计算季节性海表温度。海表温度数据是可变的,最大短期变化为 8-9 ℃。我们的海表温度记录的变化似乎与两个半球的变化没有直接关系,与格陵兰或南极冰芯记录中的千年尺度变化没有相锁关系。我们讨论这些变化的背景是,阿拉伯海可能是一个 "熔炉",北半球和南半球都会产生季节性影响。
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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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