热带和亚热带晚第四纪气候突变:热带水文气候事件的大陆信号

IF 25.2 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Reviews of Geophysics Pub Date : 2021-10-04 DOI:10.1029/2020RG000732
Raymond S. Bradley, Henry F. Diaz
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引用次数: 8

摘要

以极端区域降水异常为特征的热带水文气候事件是海洋同位素阶段2-4的一个反复出现的特征,涉及晚第四纪一些最突然和最剧烈的气候变化。这些异常在整个热带地区普遍存在,是由哈德利环流和热带辐合带(ITCZ)的南移及其相关的对流降雨引起的,并受到区域因子的调节。湖泊沉积物、石笋和近海海洋沉积物整合了内陆大陆条件,为过去~ 7万年的这些变化提供了全面的记录。大片地区经历了严重的干旱,而其他地区则记录了降雨量的大幅增加。在测年的不确定性范围内,这些热带降雨异常在时间上(±102-103年)与北大西洋冰筏碎片(IRD)沉积非常接近,后者定义了海因里希事件(HEs)。IRD记录很好地代表了额外淡水强迫的数量和分布,而额外淡水强迫是导致每次大暖期间大西洋经向翻转环流(AMOC)强度急剧减弱所必需的。由于AMOC的减少和海冰面积的突然扩大,北大西洋和邻近大陆发生了降温,并伴随一个快速的大气响应,包括ITCZ和相关雨带向南移动。哈德利环流的这种大规模变化的气候后果,受到区域因素的调节,在整个热带地区被清楚地记录为一系列突然和极端的水文气候事件。讨论了可能在这些变化中起作用的一些物理机制。
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Late Quaternary Abrupt Climate Change in the Tropics and Sub-Tropics: The Continental Signal of Tropical Hydroclimatic Events (THEs)

Tropical hydroclimatic events, characterized by extreme regional rainfall anomalies, were a recurrent feature of marine isotope stages 2–4 and involved some of the most abrupt and dramatic climatic changes in the late Quaternary. These anomalies were pervasive throughout the tropics and resulted from the southward displacement of the Hadley circulation and the Intertropical Convergence Zone (ITCZ) and its associated convective rainfall, modulated by regional factors. Lake sediments, stalagmites, and offshore marine sediments that integrate inland continental conditions provide a comprehensive record of these changes over the past ∼70,000 yr. Vast areas experienced severe drought while other areas recorded greatly increased rainfall. Within the uncertainties of dating, these tropical rainfall anomalies occurred very close in time (±102–103 yr) to the deposition of North Atlantic ice-rafted debris (IRD) that defines Heinrich events (HEs). The IRD record is a good proxy for the amount and distribution of additional freshwater forcing which was necessary to bring about a drastic reduction in the Atlantic Meridional Overturning Circulation (AMOC) strength during each HE. As a consequence of this reduction in AMOC and an abrupt expansion in the area of sea-ice, cooling of the North Atlantic and adjacent continents took place, with a rapid atmospheric response involving the southward displacement of the ITCZ and associated rainfall belts. The climatic consequences of this large-scale change in the Hadley circulation, modulated by regional factors, is clearly recorded throughout the tropics as a series of abrupt and extreme hydroclimatic events. Some of the physical mechanisms that may have played a role in those changes are discussed.

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来源期刊
Reviews of Geophysics
Reviews of Geophysics 地学-地球化学与地球物理
CiteScore
50.30
自引率
0.80%
发文量
28
审稿时长
12 months
期刊介绍: Geophysics Reviews (ROG) offers comprehensive overviews and syntheses of current research across various domains of the Earth and space sciences. Our goal is to present accessible and engaging reviews that cater to the diverse AGU community. While authorship is typically by invitation, we warmly encourage readers and potential authors to share their suggestions with our editors.
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