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Reconstructing Indian Ocean climate variability during the Pliocene

重建上新世印度洋气候变化

基本信息

批准号：
2843422
负责人：
金额：
--
依托单位：
Queen Mary University of London
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2023
资助国家：
英国
起止时间：
2023 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2843422
关键词：
Reconstructing Indian Ocean climate variability

项目摘要

Indian Ocean Climate influences the safety and the food, water, energy and financial security of over two billion people. Models do not simulate the Indian Ocean well, causing difficulties in future projection. The project will use models to reconstruct Indian Ocean climate during warm periods of the geologic past and evaluate performance with data-model comparison. We will run simulations that support the next phase of the Paleoclimate Modelling Intercomparison Project, timed to support the upcoming IPCC report. The Indo-Pacific Warm Pool (IPWP) supports deep atmospheric convection and plays a major role in the modern global hydrological cycle. Over the last 50 years, the IPWP has warmed and expanded rapidly alongside an increase in tropical upper ocean heat content. Warm, fresh waters flow unidirectionally from the Pacific to Indian Ocean through the shallow and tectonically complex Indonesian gateway. The transport of water helps to modulate the heat and freshwater balances of both oceans as well as the Atlantic through a coupled link with the Agulhas Current. We will focus on the Pliocene, the last period that the atmospheric CO2 concentrations were comparable to present. During the Pliocene, tectonic changes impacted the restrictiveness of the Indonesian Gateway. This restrictiveness and the mean climate state have implications for the oceanic heat content and the strength of the connection between ocean basins. This project will quantify tropical upper ocean heat content and IPWP heat content during intervals of distinct mean climates and Indonesian Gateway openness. We will also consider the volume transport through the Agulhas Current, compensatory mechanisms and the climate impacts of modification.

印度洋气候影响着超过 20 亿人的安全以及粮食、水、能源和金融安全。模型不能很好地模拟印度洋，给未来的预测带来困难。该项目将使用模型重建过去地质温暖时期的印度洋气候，并通过数据模型比较来评估性能。我们将运行模拟来支持古气候建模比对项目的下一阶段，并定时支持即将发布的 IPCC 报告。印度太平洋暖池（IPWP）支持深层大气对流，在现代全球水文循环中发挥着重要作用。在过去 50 年里，IPWP 随着热带上层海洋热含量的增加而迅速变暖和扩张。温暖的淡水通过浅层且构造复杂的印度尼西亚门户从太平洋单向流向印度洋。水的运输通过与厄加勒斯洋流的耦合有助于调节海洋和大西洋的热量和淡水平衡。我们将重点关注上新世，这是大气二氧化碳浓度与现在相当的最后一个时期。上新世期间，构造变化影响了印度尼西亚门户的限制性。这种限制性和平均气候状态对海洋热含量和海洋盆地之间的联系强度有影响。该项目将量化不同平均气候和印度尼西亚门户开放期间的热带上层海洋热含量和 IPWP 热含量。我们还将考虑通过厄加勒斯洋流的体积运输、补偿机制以及修改对气候的影响。