Reconstructing Indian Ocean climate variability during the Pliocene

重建上新世印度洋气候变化

• 批准号: 2843422
• 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

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20多亿人的安全、粮食、水、能源和金融安全。模型不能很好地模拟印度洋，给今后的预测造成困难。该项目将利用模型重建过去地质温暖时期的印度洋气候，并通过数据-模型比较评估性能。我们将运行模拟，以支持下一阶段的古气候建模相互比较项目，时间，以支持即将到来的IPCC报告。印度-太平洋暖池（IPWP）支持深层大气对流，并在现代全球水文循环中发挥重要作用。在过去的50年里，IPWP已经变暖并迅速扩大，同时热带上层海洋热含量也在增加。温暖、新鲜的沃茨单向地从太平洋流向印度洋，穿过构造复杂的印度尼西亚门户。水的输送有助于调节两大洋以及大西洋的热量和淡水平衡，这是通过与阿古拉斯洋流的耦合来实现的。我们将重点关注上新世，这是大气中二氧化碳浓度与现在相当的最后一个时期。在上新世，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联系的强度有影响。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。我们还将考虑通过阿古拉斯海流的体积输送，补偿机制和修改的气候影响。