Collaborative Research: A new pathway of Indonesian Throughflow in the Indian Ocean: Mechanisms and role in transporting the excess heat and freshwater of the recent hiatus decade

合作研究：印度洋印度尼西亚通流的新途径：近十年间的过剩热量和淡水输送机制和作用

基本信息

批准号：
2242194
负责人：
Toshiaki Shinoda
金额：
$ 24.74万
依托单位：
Texas A&M University Corpus Christi
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2023
资助国家：
美国
起止时间：
2023-04-15 至 2026-03-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2242194&HistoricalAwards=false
关键词：
Collaborative Research new pathway Indonesian

项目摘要

The Indonesian Throughflow (ITF) is a key component of the global thermohaline circulation that affects the large-scale ocean circulation and global climate. During the recent hiatus decade (2003-2012) about two-thirds of the excess heat that entered Earth’s climate system was stored in the Indian Ocean. This project will address the ITF pathway patterns in the South Indian Ocean. The PIs propose a new pathway for heat flow in the Southeast Indian Ocean and will investigate its role in distributing the excess heat and freshwater that entered the South Indian Ocean from the ITF during the hiatus decade. An integral approach will be used that combines analyses of observational and reanalysis datasets with high-resolution ocean model experiments. These methods will be used to characterize the spatial and temporal structure of the flow pathway, investigate the forcing and processes that govern the pathways of ITF waters, and explore the roles of the different pathways in distributing heat and freshwater in the South Indian Ocean.The PIs hypothesize the existence of a flow pathway for waters from the ITF between the Southeast Indian Ocean and the subtropical South Indian Ocean, along which ITF waters spread to the western subtropical South Indian Ocean with a portion leaking to the Southern Ocean. They posit that this pathway was the major conduit for the enhanced ITF heat and freshwater transport of the recent global surface warming hiatus period. To test this observational data will be analyzed in combination with numerical model experiments. Observational data will include data from moorings, drifters, satellites, reanalysis products. Model data will include existing 1/10 degree simulations from Ocean General Circulation Models For the Earth Simulator and new 1/12 degree runs using HYCOM. The overall goals of the research are to explore the potential new pathway of ITF waters in the South Indian Ocean, investigate the governing mechanisms of this new pathway, and quantify its role in transporting the excess heat and fresher ITF waters during the recent hiatus period into the Greater Agulhas Current System of the subtropical Southwest Indian Ocean. The project focuses on the hiatus period 2003-2012 when a dramatic heat increase in the Indian Ocean due to enhanced ITF was observed.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

印尼遍布（ITF）是影响大型海洋循环和全球气候的全球热盐循环的关键组成部分。在最近的中断十年（2003-2012）中，进入地球气候系统的过量热量中约有三分之二存储在印度洋。该项目将解决南印度洋的ITF途径模式。 PIS提出了在印度洋东南部的热流动的新途径，并将调查其在裂变十年中从ITF进入南印度洋的多余热量和淡水中的作用。将使用一种整体方法，将观察性和重新分析数据集的分析与高分辨率海洋模型实验结合在一起。 These methods will be used to characterize the spatial and temporary structure of the flow pathway, investigate the forcing and processes that govern the pathways of ITF waters, and Explore the roles of the different pathways in distributing heat and freshwater in the South Indian Ocean.The PIs hypothesize the existence of a flow pathway for waters from the ITF between the Southeast Indian Ocean and the subtropical South Indian Ocean, along which ITF waters spread to the western亚热带南印度洋，一部分泄漏到南大洋。他们确认这一途径是最近全球表面变暖时期增强ITF热量和淡水运输的主要渠道。为了测试这些观察数据，将与数值模型实验结合进行分析。观察数据将包括来自系泊设备，演练，卫星，再分析产品的数据。模型数据将包括来自地球模拟器的海洋通用循环模型的现有1/10度模拟，并使用HYCOM进行了新的1/12度运行。这项研究的总体目标是探索南印度洋ITF水域的潜在新途径，研究这一新途径的管理机制，并量化其在最近的中断时期内的过量热量和更新鲜的ITF水域中的作用，进入大型西南海洋的大型Agulhas当前系统。该项目的重点是2003 - 2012年的中断时期，当时印度洋急剧增加了ITF，该奖项反映了NSF的法定任务，并且通过使用基金会的知识分子和更广泛的影响评估标准，通过评估来诚实地获得支持。