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领域非常感兴趣的话题。预测气候情景需要能够预测二氧化碳等辐射重要气体的海气交换。 之前的 NSF 奖项（AGS-1036062；1036006 合作研究：测量强风中的空气-海洋气体交换以改进基于物理的空气-海洋传输参数化：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。 HiWinGS 拉布拉多海巡航于 2013 年 10 月至 11 月成功完成，产生了 700 多个小时的协调通量和波浪物理观测，其中包括 15-27 m/s 风速下的 100 多个小时。这是一个独特的数据集。这里进行的分析工作的具体目标是：1）对观测到的热量、动量、痕量气体 DMS 和 CO2 的传递系数相对于风速、应力、气泡羽流特征和海况进行分析； 2) 在可用的整体通量算法中进一步开发高风速下气体传输的精确物理表示； 3) 对从 HiWinGS 巡航获得的各种二氧化碳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.