Numerical Study of Interactions Between Mesoscale Convective Systems and Ocean Mixed-Layer in the Western Pacific Warm Pool Using a Nested-Grid Coupled Ocean-Atmopshere Mesoscale

基于嵌套网格耦合海气中尺度的西太平洋暖池中尺度对流系统与海洋混合层相互作用的数值研究

• 批准号: 9632390
• 负责人: Sethu Raman
• 金额: $ 34.07万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-15 至 2002-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632390&HistoricalAwards=false
• 关键词: Numerical; Study; Interactions; Between; Mesoscale

9632390 Raman The meteorology over the Western Pacific Ocean is not well-known, but has a great influence on the global climate. A field program named the Tropical Ocean Global Atmosphere, Coupled Ocean-Atmosphere Response Experiment (TOGA COARE) had as one of its objectives to increase understanding of the characteristics of mesoscale convective systems (MCS) over the Western Pacific. Of special interest is the potential for MCSs to significantly modify air-sea momentum, heat and moisture fluxes over a large area relative to that of an individual cumulonimbus cloud. The Principal Investigator will investigate and quantitatively describe the interactions between MCSs and the ocean mixed layer in the Western Pacific warm pool (WPWP) using a nested-grid, coupled ocean-atmosphere mesoscale model. Specific objectives include: (i) improve understanding of the effect of the WPWP on the equilibrium and transient structures of the marine atmospheric boundary layer; (ii) identify and quantify the feedback effect of wind, air temperature and precipitation associated with MCSs over the warm pool on the horizontal and vertical density distributions of the ocean mixed-layer, and on the air-sea heat and moisture fluxes; (iii) identify and quantify the feedback effect of changes in air-sea heat and moisture fluxes, sea surface temperature and sea surface temperature gradients due to convective and mesoscale processes on subsequent development of convective and mesoscale events; (iv) assimilate important parameters in the atmospheric and oceanic boundary-layers using a coupled mesoscale model. Successful completion of this research will assist in improving knowledge of the impact of MCS on planetary scale events such as El Nino. ***

9632390 拉曼 西太平洋上空的气象并不为人所知，但对全球气候影响很大。 名为热带海洋全球大气、海洋-大气耦合响应实验（TOGA COARE）的实地计划的目​​标之一是增进对西太平洋中尺度对流系统（MCS）特征的了解。 特别令人感兴趣的是，相对于单个积雨云，MCS 有可能显着改变大面积的海气动量、热量和水分通量。 首席研究员将使用嵌套网格、海洋-大气耦合中尺度模型研究并定量描述 MCS 与西太平洋暖池 (WPWP) 海洋混合层之间的相互作用。 具体目标包括： (i) 增进对 WPWP 对海洋大气边界层平衡和瞬态结构影响的了解； (ii) 确定并量化与暖池上空 MCS 相关的风、气温和降水对海洋混合层的水平和垂直密度分布以及海气热和湿通量的反馈效应； (iii) 确定并量化对流和中尺度过程造成的海气热量和湿度通量、海面温度和海面温度梯度变化对对流和中尺度事件后续发展的反馈影响； (iv) 使用耦合中尺度模型同化大气和海洋边界层中的重要参数。 成功完成这项研究将有助于提高人们对 MCS 对厄尔尼诺等行星规模事件影响的了解。 ***