South Asian summer monsoon enhanced by the uplift of the Iranian Plateau in Middle Miocene

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Climate of The Past Pub Date : 2024-08-13 DOI:10.5194/cp-20-1817-2024
Meng Zuo, Yong Sun, Yan Zhao, Gilles Ramstein, Lin Ding, Tianjun Zhou
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Abstract

Abstract. The South Asian summer monsoon (SASM) significantly intensified during the Middle Miocene (17–12 Ma), but the driver of this change remains an open question. The uplift of the Himalaya (HM) and the Iranian Plateau (IP) and global CO2 variation are prominent factors among suggested drivers. Particularly, the impact of high CO2 levels on the Miocene SASM has been little studied, despite the wide range of reconstructed CO2 values around this period. Here we investigate their effects on the SASM using the fully coupled Ocean–Atmosphere Global Climate Model, CESM1.2, through a series of 12 sensitivity experiments. Our simulations show that the IP uplift plays a dominant role in the intensification of the SASM, mainly in the region around northwestern India. The effect of the HM uplift is confined to the range of the HM and its vicinity, producing orographic precipitation change. The topography forcing overall out-competes CO2 variation in driving the intensification of the SASM. In the case of extremely strong CO2 variation, the effects of these two factors are comparable in the core SASM region, while in the western region, the topographic forcing is still the dominant driver. We propose a thermodynamical process linking the uplift of the IP and the enhanced SASM through the release of latent heat. When compared with reconstructions, the simulated response of SASM to the IP uplift is in good agreement with observed precipitation and wind field, while the effects of the HM uplift and CO2 variation are inadequate to interpret the proxies.
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中新世伊朗高原隆升使南亚夏季季风增强
摘要南亚夏季季风(SASM)在中新世(17-12 Ma)期间明显增强,但这一变化的驱动因素仍是一个未决问题。喜马拉雅山脉(HM)和伊朗高原(IP)的隆起以及全球二氧化碳的变化是所提出的驱动因素中的主要因素。尤其是高二氧化碳水平对中新世 SASM 的影响,尽管这一时期重建的二氧化碳值范围很广,但研究却很少。在此,我们利用完全耦合的海洋-大气全球气候模式 CESM1.2,通过一系列 12 项敏感性实验研究了它们对 SASM 的影响。模拟结果表明,IP 上升对 SASM 的加剧起着主导作用,主要集中在印度西北部地区。HM 上升的影响仅限于 HM 范围及其附近地区,产生了地形降水变化。在推动 SASM 加剧方面,地形强迫总体上超过了二氧化碳变化。在二氧化碳变化极其强烈的情况下,这两个因素的影响在 SASM 核心区域不相上下,而在西部地区,地形强迫仍是主要驱动因素。我们提出了一个热力学过程,通过释放潜热将 IP 的抬升和 SASM 的增强联系起来。与重建结果相比,SASM 对 IP 抬升的模拟响应与观测到的降水和风场非常吻合,而 HM 抬升和 CO2 变化的影响不足以解释代用指标。
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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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