Deciphering the variations and mechanisms of global land monsoons during Marine Isotope Stage 3

IF 4.8 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Jinzhe Zhang, Qing Yan, Nanxuan Jiang, Chuncheng Guo
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Abstract

Abstract Marine Isotope Stage 3 (MIS 3) is characterized by significant millennial-scale climatic oscillations between cold stadials and mild interstadials, which presents a valuable case for understanding hydrological response to abrupt climate change. Through a set of coupled model simulations, our results broadly show an anti-phased interhemispheric change in land monsoonal precipitation during the present-day relative to MIS 3 interstadial and the stadial-interstadial transition, with a general decrease in the Northern Hemisphere but an increase in the Southern Hemisphere. The anti-phased pattern is largely caused by the change in orbital insolation during the present-day relative to MIS 3 interstadial whereas by the weakened Atlantic Meridional Overturning Circulation during the interstadial-stadial transition. However, there are obvious discrepancies in precipitation response and underlying mechanisms among individual monsoon domains and across different periods. Based on the moisture budget analysis, we indicate that the dynamic factor mainly explains the decreased monsoonal rainfall in the Northern Hemisphere during the present-day relative to the MIS 3 interstadial, whereas the thermodynamic term is largely responsible for the increased precipitation in the Southern Hemisphere. In contrast, the dynamic factor plays an important role in the variation of precipitation over all the monsoon zones from the MIS 3 interstadial to stadial states, with the thermodynamic term mainly contributing to the decreased tropical monsoonal precipitation in the colder Northern Hemisphere. Our results help improve the understanding of global monsoon variations under intermediate glacial climate conditions and shed light on their behaviors under potentially rapid climate change in the future.
解密海洋同位素第三阶段全球陆地季风的变化和机制
摘要 海洋同位素阶段 3(MIS 3)的特点是在寒冷的恒年期和温和的间冰期之间出现显著的千年尺度气候振荡,这为了解水文对气候突变的响应提供了一个有价值的案例。通过一组耦合模型模拟,我们的结果大致显示,在现今相对于 MIS 3 间期和间期-间期过渡期间,陆地季风降水量出现了反阶段的半球间变化,北半球降水量普遍减少,而南半球则有所增加。这种反相模式主要是由于现今相对于 MIS 3 间期的轨道日照变化造成的,而在间期-恒星过渡期间,大西洋经向翻转环流减弱也是造成这种反相模式的原因。然而,不同季风域和不同时期的降水响应及其内在机制存在明显差异。根据水汽预算分析,我们发现,相对于 MIS 3 间期,动态因子主要解释了现今北半球季风降水量减少的原因,而热力学因子则是南半球降水量增加的主要原因。与此相反,动态因子在所有季风区从 MIS 3 间期到恒定期的降水量变化中发挥了重要作用,而热力学因子主要导致了较冷的北半球热带季风降水量的减少。我们的研究结果有助于加深对冰川中期气候条件下全球季风变化的理解,并揭示了未来可能发生的快速气候变化下季风的行为。
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来源期刊
Journal of Climate
Journal of Climate 地学-气象与大气科学
CiteScore
9.30
自引率
14.30%
发文量
490
审稿时长
7.5 months
期刊介绍: The Journal of Climate (JCLI) (ISSN: 0894-8755; eISSN: 1520-0442) publishes research that advances basic understanding of the dynamics and physics of the climate system on large spatial scales, including variability of the atmosphere, oceans, land surface, and cryosphere; past, present, and projected future changes in the climate system; and climate simulation and prediction.
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