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.

印度尼西亚穿流（ITF）是全球温盐环流的重要组成部分，影响着大范围的海洋环流和全球气候，在最近十年（2003-2012）期间，大约有三分之二的多余热量进入了地球气候系统。该项目将解决南印度洋的 ITF 路径模式，提出东南印度洋热流的新路径，并将研究其在分配多余热量和中的作用。将使用将观测和再分析数据集分析与高分辨率海洋模型实验相结合的综合方法来描述中断十年期间从 ITF 进入南印度洋的淡水。流动路径、控制 ITF 水域路径的强迫和过程，并探索不同路径在南印度洋分配热量和淡水中的作用。PI 揭示了 ITF 之间的水流路径的存在东南部印度洋和副热带南印度洋，ITF 水域沿着这些通道扩散到西副热带南印度洋，其中一部分泄漏到南大洋，他们认为这条路径是最近 ITF 热量和淡水输送增强的主要通道。为了检验这一观测数据，将结合数值模型实验来分析观测数据，其中包括来自系泊装置、漂流器、卫星的数据，再分析模型数据将包括现有的 1/10 度。地球模拟器的海洋环流模型和使用 HYCOM 的新 1/12 度运行研究的总体目标是探索南印度洋 ITF 水域的潜在新路径，研究该新路径的控制机制。，并量化其在最近的间歇期将多余热量和较新鲜的 ITF 水域输送到副热带西南印度洋大厄加勒斯洋流系统中的作用。该项目重点关注间歇期。 2003-2012 年，由于 ITF 的增强，印度洋的热量急剧增加。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。