Field Measurements and Preliminary Simulation of Atmospheric Boundary Layer Evolution in EPIC2001

东太平洋海洋-大气耦合系统气候过程调查（EPIC）是美国CLIVAR计划的一项活动。EPIC 2001由四个部分组成，重点关注(i)热带辐合带/暖池现象；（ii）热带辐合带的跨赤道流入；（iii）上层海洋结构和混合；（iv）东南信风区边界层云性质的探索性研究。EPIC 2001的实地阶段计划在2001年9月1日至10月15日期间进行为期6周的研究。除了获得ATM的8个奖项外，该合作研究还获得了NSF/OCE和NOAA/OGP的奖项。在实地阶段，PI将在现有浮标阵列上添加特殊传感器，以10分钟的时间分辨率收集大气压力数据。他还将进行初步的大涡模拟，模拟行星边界层在平流穿过赤道冷舌进入ITCZ时的准拉格朗日演化过程。将结合过去研究的现场探测和NCEP再分析的9月气候学数据来初始化和强制这些模拟。这项工作很重要，因为它将提高对热带太平洋东部气候变化的理解和建模。

EPIC (Eastern Pacific Investigation of Climate processes in the coupled ocean-atmosphere system) is an activity of the US CLIVAR Program. EPIC 2001 consists of four components focussing on (i) intertropical convergence zone/warm pool phenomena; (ii) cross-equatorial inflow into the intertropical convergence zone; (iii) upper ocean structure and mixing and (iv) an exploratory study of boundary layer cloud properties in the southeasterly tradewind regime. The field phase of EPIC 2001 is scheduled for a 6-week period during the interval Sept 1 to Oct 15, 2001. In addition to the eight awards made by ATM, this collaborative research has awards made by NSF/OCE and NOAA/OGP.During the field phase, the PI will add special sensors to an existing buoy array to collect atmospheric pressure data at a temporal resolution of 10 minutes. He also will conduct preliminary large-eddy simulations of the quasi-lagrangian evolution of the planetary boundary layer as it is advected across the equatorial cold tongue and into the ITCZ. A combination of in-situ soundings from past studies and September climatology from the NCEP reanalysis will be used to initialize and force these simulations. The work is important because it will improve understanding and modeling of climate variability over the eastern tropical Pacific.