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

9632390拉曼西太平洋的气象并不广为人知，但对全球气候有很大的影响。一个名为热带海洋全球大气-大气耦合响应实验(TOGA COARE)的实地方案的目标之一是增加对西太平洋上中尺度对流系统(MCS)特征的了解。特别令人感兴趣的是，与单个积雨云相比，MCSs有可能显著改变大范围内的海气动量、热量和水汽通量。首席调查员将使用嵌套网格、海洋-大气耦合中尺度模式来调查和定量描述MCSs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变结构的影响的了解；(Ii)识别和量化与暖池上方的MCSs有关的风、气温和降水对海洋混合层的水平和垂直密度分布以及对海-海热量和水汽通量的反馈影响；(Iii)识别和量化对流和中尺度过程引起的海气热湿通量、海面温度和海面温度梯度的变化对后续对流和中尺度事件发展的反馈影响；(4)利用耦合的中尺度模式同化大气和海洋边界层中的重要参数。这项研究的成功完成将有助于增进对MCS对厄尔尼诺等行星尺度事件的影响的认识。***

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. ***