Measuring Air-Sea Gas Exchange in High Winds for Improvement of Physics-Based Air-Sea Transfer Parameterizations

高风速下海气相互作用的参数化仍然是海气交换研究中一个非常感兴趣的课题。预测气候情景需要能够预测二氧化碳等具有重要辐射意义的气体的海气交换。 美国国家科学基金会先前的一项奖项（AGS- 1036062; 1036006合作研究：测量大风中的海气交换，以改善基于物理的海气交换参数化：HiWinGS）资助了一个为期4年的项目，以开发和改进气体交换测量。 2013年10月至11月，HiWinGS成功完成了对拉布拉多海的巡航，获得了700多小时的协调通量和波浪物理观测，其中包括15-27米/秒风速下的100多小时。这是一个独特的数据集。在此进行的分析工作的具体目标是：1）分析观测到的热量、动量、痕量气体DMS和CO2相对于风速、应力、气泡羽流特征和海况的传输系数; 2）进一步发展现有整体通量算法中高风速下气体传输的精确物理表示; 3）对HiWinGS巡航获得的各种CO2通量数据集进行严格评估。

The parameterization of air-sea interaction at high wind speeds continues as a topic of great interest to air-sea exchange. Being able to predict air-sea gas exchange of radiatively important gases such as carbon dioxide is needed to project climate scenarios. A previous NSF award (AGS- 1036062; 1036006 Collaborative Research: Measuring Air-Sea Gas Exchange in High Winds for Improvement of Physics-Based Air-Sea Transfer Parameterizations: HiWinGS) funded a 4-year project to develop and improve gas exchange measurements. A HiWinGS cruise to the Labrador Sea was successfully completed in Oct-Nov 2013, yielding more than 700 hours of coordinated flux and wave physics observations, including more than 100 hours at wind speeds of 15-27 m/s. This is a unique data set. Specific goals of the analysis work undertaken here are to:1) present an analysis of the observed transfer coefficients for heat, momentum, the trace gases DMS and CO2 with respect to wind speed, stress, bubble plume characteristics and sea state; 2) further develop the refined physical representations for gas transfer at high wind speeds in available bulk flux algorithms; and 3) engage in a critical assessment of the various CO2 flux data sets obtained from the HiWinGS cruise.