The Role of Tropical Asian Landcover Disturbance in Altering Large-scale Circulations: Interaction with El Nino Southern Oscillation (ENSO) and the Asian Summer Monsoon

亚洲热带土地覆盖扰动在改变大规模环流中的作用：与厄尔尼诺南方涛动（ENSO）和亚洲夏季季风的相互作用

• 批准号: 0437538
• 负责人: Thomas Chase
• 金额: --
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-12-01 至 2008-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0437538&HistoricalAwards=false
• 关键词: Role; Tropical; Asian; Landcover; Disturbance

Several recent papers have documented atmospheric circulation changes resulting from changing tropical land cover in climate model simulations. The proposed research focuses on elucidating the role of land cover changes in changing global circulation regimes and the interactions between the effects of land cover change and other modes of variability including El Nino southern oscillation (ENSO) and the Asian summer monsoon through a variety of general circulation model simulations. The PIs address the following main hypotheses:1) Historical land cover changes in the tropics and in Southeast Asia, in particular, cause similar magnitude circulation changes as seen in the alternating phases of ENSO. By affecting the tropical divergent circulation, these changes have global reach. 2) Tropical land cover changes cause shifts in tropical circulations which would tend to enhance the El Nino phase of ENSO at the expense of La Nina.3) Circulation changes due to land cover change and those due to ENSO interact non-linearly.4) Circulation changes due to tropical land cover changes may have a role in explaining the observed decreased anticorrelation between El Nino and the Indian summer monsoon. The PIs will examine these hypotheses with ensemble general circulation model simulations and observational analysis of circulation changes due to tropical land cover changes; changes due to El Nino-like SST anomalies and circulation changes due to a combination of both effects. Broader Impacts: This research adds significantly to previous studies of the effect of land cover change and addresses two large, outstanding questions (intellectual merit) with broader impacts in promoting interdisciplinary research, and societal implications including the prediction of regional monsoon variability and the expression of expected CO2 induced global warming.This project is supported under the Climate Variability and Predictability Program (CLIVAR).

最近的几篇论文记录了气候模式模拟中热带土地覆盖变化引起的大气环流变化。拟议的研究重点是阐明土地覆盖变化在不断变化的全球环流体系中的作用，以及土地覆盖变化的影响与其他变率模式之间的相互作用，包括厄尔尼诺南方涛动（ENSO）和亚洲夏季风通过各种大气环流模式模拟。 PI解决了以下主要假设：1）热带和东南亚历史上的土地覆盖变化，特别是，引起类似的规模环流变化，如ENSO的交替阶段。通过影响热带辐散环流，这些变化具有全球影响力。 2)热带陆地覆盖变化导致热带环流的变化，这将增强ENSO的厄尔尼诺阶段，而La Nina的损失。3）陆地覆盖变化引起的环流变化与ENSO引起的环流变化之间存在非线性的相互作用。4）热带陆地覆盖变化引起的环流变化可能在解释观测到的厄尔尼诺与印度夏季风之间的相关性减弱方面发挥作用。PI将通过集合环流模式模拟和对热带土地覆盖变化引起的环流变化的观测分析来检查这些假设;由于厄尔尼诺现象引起的SST异常变化以及由于两种效应的组合引起的环流变化。更广泛的影响：这项研究大大增加了以前的土地覆盖变化的影响的研究，并解决了两个大的，突出的问题（智力价值），在促进跨学科的研究，和社会影响，包括区域季风变化的预测和预期的CO2诱导的全球warming.This项目的表达下支持的气候变化和可预测性计划（CLIVAR）的影响更广泛。