Photochemical Modeling in Support of CONTRAST (CONvective TRansport of Active Species in the Tropics)

该项目是计划于2014年1月和2月进行的热带活动物种对流输送(对比)实验的重要组成部分，NSF/NCAR GV航班将从关岛起飞。这项工作包括飞行计划和光化学建模，以在战役期间提供近乎实时的数据解释，以及在任务结束后进行建模和数据解释。对比试验的目的是测量西太平洋暖池区上空热带对流层顶过渡层(TTL)中活性化学物质的化学和输送情况。在北方冬季期间，微量气体及其降解产物进入该地区平流层下部的来源、化学和输送可对平流层下部的化学产生重大影响。对比飞行任务是与两个伙伴项目合作组织的：ATTREX(机载热带对流层顶实验)--美国国家航空航天局利用高海拔全球鹰(GH)的项目，和CAST(热带地区协调机载研究)--一个由英国国家环境研究理事会赞助的使用BAE-146飞机的项目。对比研究的目的是：(1)在深对流季期间描述西太平洋对流外流水平上的化学成分；(2)评估TTL中有机和无机溴和碘的收支；(3)调查从海洋表面到对流层顶的输送路径。这一努力的结果将增加对卤素预算和对平流层臭氧消耗的影响的了解。它还将改进面向过程的化学/气候模型的开发及其验证。

This project is an important part of the Convective Transport of Active Species in the Tropics (CONTRAST) experiment scheduled for January and February 2014, with NSF/NCAR GV flights based out of the island of Guam. This effort includes flight planning and photochemical modeling to provide near real time interpretation of data during the campaign, and post-mission modeling and data interpretation afterward. CONTRAST is designed to measure the chemistry and transport of reactive chemical species into the tropical Tropopause Transition Layer (TTL) over the Western Pacific warm pool area. The sources, chemistry, and transport of trace gases and their degradation products into the lower stratosphere in this region during the boreal winter season can substantially impact the chemistry of the lower stratosphere. The CONTRAST mission is organized in collaboration with two partner projects: ATTREX (the Airborne Tropical Tropopause Experiment--a NASA project utilizing the high altitude Global Hawk (GH), and CAST (Coordinated Airborne Studies of the Tropics)--a project sponsored by the British National Environment Research Council using a BAe-146 aircraft. The research objectives of CONTRAST are to: (1) Characterize the chemical composition at the level of convective outflow over the Western Pacific during the deep convective season; (2) Evaluate the budget of organic and inorganic bromine and iodine in the TTL; and (3) Investigate transport pathways from the oceanic surface to the tropopause. The results of this effort will increase understanding of halogen budgets and impacts on stratospheric ozone depletion. It will also improve the development of process-oriented chemistry/climate models and their validation.