Collaborative Research: P2C2--Expansion/Contraction of the Intertropical Convergence Zone; An Emerging Mechanism of Tropical Precipitation Changes for Reinterpreting Paleoclimate

合作研究：P2C2——热带辐合带的扩张/收缩；

基本信息

批准号：
1702827
负责人：
Aaron Donohoe
金额：
$ 26.95万
依托单位：
University of Washington
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-15 至 2021-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1702827&HistoricalAwards=false
关键词：
Collaborative Research P2C2 Expansion Contraction

项目摘要

The spatial distribution of tropical precipitation is determined by the average location and seasonal march of the intertropical convergence zone (ITCZ). The latitudinal shift of the ITCZ is typically employed as the go-to theory for interpreting past hydroclimate changes and defining mechanisms of the response to climate forcing (past and future). This project, however, is based on the premise that the simultaneous contraction and intensification (CI) of the ITCZ is a far more powerful mode of tropical precipitation changes (by a factor of 4) in response to both paleoclimate and anthropogenic forcing than the more commonly employed ITCZ shift.The overarching goal of the project is to couple reconstructions of past changes in the CI mode from paleoclimate proxy records with a dynamical framework of the CI mode to constrain future tropical precipitation changes and variability. This specific aims are to: i) explore the dynamics of the CI mode to identify the mechanisms that lead to the direction of changes seen in simulations of past and future climate as well as evaluate the uncertainties in these processes and ii) use the emerging knowledge of the CI mode to reinterpret the paleoclimate record to constrain the past behavior of ITCZ shifts versus CI. The project would help develop a deeper understanding of the ITCZ and potentially improve the ability of climate models to forecast broad-scale future changes (and variability) in the magnitude and spatial structure topical precipitation. The project would also support two early career scientists and leverage existing public outreach programs in science at the University of Washington and the University of California-Berkeley.

热带降水的空间分布取决于中热带收敛区（ITCZ）的平均位置和季节性游行。 ITCZ的纬度转移通常被用作解释过去的氢气气候变化和对气候强迫反应的定义机制（过去和将来）的定义机制。然而，该项目基于以下前提：ITCZ的同时收缩和强化（CI）是一种更强大的热带降水变化的模式（响应于古气候和人为强迫的响应，比古更常见的ITCZ变化都可以使Project of Project of Dynight of CI逐渐变化。 CI模式以限制未来的热带降水变化和可变性。 This specific aims are to: i) explore the dynamics of the CI mode to identify the mechanisms that lead to the direction of changes seen in simulations of past and future climate as well as evaluate the uncertainties in these processes and ii) use the emerging knowledge of the CI mode to reinterpret the paleoclimate record to constrain the past behavior of ITCZ shifts versus CI.该项目将有助于更深入地了解ITCZ，并有可能提高气候模型在大小和空间结构局部降水中预测未来变化（和可变性）的能力。该项目还将支持两位早期的职业科学家，并利用华盛顿大学和加利福尼亚大学 - 伯克利分校的科学上现有的公共外展计划。