EUREC4A-UK: Elucidating the role of cloud-circulation coupling in climate

EUREC 4A-UK是一个观测和建模研究方案，重点是联合王国科学家和BAS Twin Otter研究飞机的参与，以研究边界层、气溶胶和积云过程中出现的云下相干结构，以及与EUREC 4A（阐明云-环流耦合在气候中的作用）国际项目中较大尺度（从巴巴多斯到非洲）的联系。由法国和德国牵头的EUREC 4A资助项目旨在解决目前对云对气候变化的反应缺乏了解的问题，将这一问题列为世界气候研究计划的重大科学挑战证明了这一问题的紧迫性。英国科学家和BAS Twin Otter受邀参与，提供独特的云及其环境观测和分析，这对于理解和模拟气候变化中的耦合是必要的。EUREC 4A实地活动将于2020年1月20日至2月20日在巴巴多斯以东的大西洋下游贸易区进行。它将涉及几架飞机，包括德国HALO（用于上层采样）和法国ATR-42飞机、四艘研究船、雷达和激光雷达以及巴巴多斯的其他地面仪器。该项目将利用已开发的新方法来限制影响云量的大尺度因素。实地作业将通过若干卫星的立交桥进行协调，其中包括高级星载热发射和反射辐射计，以及一些旗舰空间飞行任务的卫星，这些卫星预计将在活动期间进入轨道，例如ADM-Aeolus。没有计划研究次云结构和气溶胶、云过程、信风积云生命周期所涉及的动力学以及在气候模式中的重要性的细节。EUREC 4A-UK将填补这一空白，并提供这些过程的新知识，并允许使用最先进的对流和云过程参数化来帮助理解，但也面临挑战。BAS Twin Otter飞机将与其他飞机和设施协调，纳入上述项目计划。

EUREC4A-UK is a programme of observational and modelling research that is focussed around the participation of UK scientists and the BAS Twin Otter research aircraft to study sub-cloud coherent structures that occur in the boundary layer, aerosol and cumulus cloud processes, and the links to the larger scales (from Barbados to Africa) in the international project, EUREC4A (Elucidating the Role of Clouds-Circulation Coupling in Climate). The French-German led EUREC4A funded project aims to address the current lacking in understanding of the response of clouds to a changing climate, the urgency of which is evidenced by inclusion of this problem as a Grand Science Challenge of the World Climate Research Programme. The UK scientists and BAS Twin Otter have been invited to participate to uniquely provide observations and analysis of clouds and their environment that are necessary to understand and model this coupling in a changing climate.The EUREC4A field campaign will take place between 20 January and 20 February 2020 in the lower Atlantic trades, over the ocean to the east of Barbados. It will involve several aircraft, including the German HALO (for upper-level sampling) and French ATR-42 aircraft, four research vessels, radars and lidars and other ground-based instruments on Barbados. The project will exploit new methods that have been developed for constraining the large-scale factors influencing cloudiness. Field operations will be coordinated with overpasses of several satellites: including the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), as well as a number of satellites from flagship space missions that are expected to be in orbit by the time of the campaign: e.g. ADM-Aeolus.There is a missing component in EUREC4A, however. There is no plan to study the details of the sub-cloud structures and aerosols, cloud processes, dynamics involved in the life cycle of trade-wind cumulus clouds and the importance in climate models. EUREC4A-UK will fill this gap and provide new knowledge of these processes and allow both for the use of state-of-the-art parametrisations of convection and cloud processes to aid the understanding, but also to be challenged. The BAS Twin Otter aircraft will be integrated into the above project plan in coordination with the other aircraft and facilities.