Collaborative Proposal: Gas Flux under Hurricane Winds

飓风风下的气体通量Eric D‘Asaro UW Craig McNeil URIT将使用新开发的极谱氧气传感器和改进的气体总张力传感器，在风速为30 ms-1或更大的情况下测量O2和N2的海气通量，该传感器安装在中性浮标上，并被空气部署到飓风路径中。这些数据将被用来将气体通量参数化扩展到更高的风速。这一点很重要，因为大气和海洋之间穿过海-气界面的二氧化碳通量是全球碳收支中的一个重要术语。现在用于计算这一通量的气体通量参数在高风速下是高度不确定的。彩车将绘制风暴前后的O、N、温度和盐度剖面，准确跟踪地表混合层内水团的三维运动。气体流量将使用4种不同的方法进行推断；每种方法对不同的误差都很敏感，因此使用多种方法可以相互检查。现有的气体张力传感器将进行改进，以增加气体交换膜的面积，以增加其响应时间，并支持利用气体含量变化的协方差通量和通量分布的方法。从测量和大涡模拟两方面对气泡诱导的气体通量进行详细的建模，将被用来理解在高风速下气体通量的机制。彩车部署将作为2003年和2004年由ONR资助的CBLAST实地试验的一部分。

Gas Flux under Hurricane WindsEric D'Asaro UWCraig McNeil URIThe air-sea fluxes of O2 and N2 will be measured at wind speeds of 30 ms-1 or greater using a newly developed polarographic oxygen sensor and an improved total gas tension sensor mounted on neutrally buoyant floats and air-deployed into the path of hurricanes. These data will be used to extend the gas flux parameterizations to higher wind speeds. This is important because the flux of CO2 between the atmosphere and the ocean across the air-sea interface is a major term in global carbon budgets. The gas flux parameterizations now used to compute this flux are highly uncertain at high wind speeds. The floats will make profiles of O, N, temperature and salinity before and after the storm, accurately following the 3-dimensional motions of water parcels within the surface mixed layer. Gas fluxes will be inferred using 4 different methods; each method is sensitive to different errors and thus the use of many methods will provide a check against each other. The existing gas tension sensors will be modified to increase the area of the gas exchange membrane in order to increase their response time and support the methods of suing covariance fluxes and flux profiles from changes in gas content. Detailed modeling of bubble-induced gas fluxes from both measurements and Large Eddy Simulations will be used to understand mechanisms of gas flux at high wind speed. Float deployments will be made as part of the ONR-funded CBLAST field experiments in 2003 and 2004.