Collaborative Proposal: Gas Flux under Hurricane Winds

飓风下的气体通量将在风速为30ms -1或更大的情况下测量O2和N2的海气通量，使用新开发的极谱氧传感器和改进的总气体张力传感器，该传感器安装在中性浮子上，并在飓风路径上进行空气部署。这些数据将用于将气体通量参数化扩展到更高的风速。这很重要，因为大气和海洋之间通过海气界面的二氧化碳通量是全球碳预算的一个主要术语。现在用于计算这种通量的气体通量参数化在高风速下是高度不确定的。浮标将在风暴前后绘制O、N、温度和盐度的剖面，准确地跟踪表面混合层内水团的三维运动。将使用4种不同的方法推断气体通量；每种方法对不同的错误都很敏感，因此使用许多方法将提供相互检查。现有的气体张力传感器将被改进，以增加气体交换膜的面积，以增加它们的响应时间，并支持从气体含量变化中使用协方差通量和通量剖面的方法。通过测量和大涡模拟对气泡诱导气体通量的详细建模将用于了解高风速下气体通量的机制。浮子部署将在2003年和2004年作为onr资助的CBLAST野外实验的一部分。

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.