Development and Use of A Moored, Sequential Noble Gas Sampler

小行星9302812 了解影响海洋上层气体的物理过程对于定量海洋上层的地球化学循环非常重要。 对海洋上层溶解气体浓度的时间序列测量反映了大气-海洋“强迫”的变化，已证明对研究气体交换率是有效的。 该项目将开发和部署一个系泊惰性气体连续采样系统，从而能够确定近地表若干深度惰性气体浓度的时间序列。 该设备将能够在几天到几个月的时间内以预定的时间间隔获得50到100个样本（根据科学计划的规定）。 样本将在实验室使用一个独立的自动真空系统进行处理，该系统将依次提取和分析储存的样本。 将分析稀有气体（He、Ne、Ar和Kr），以记录大风事件期间气体浓度的时间演变，从而可以对这些风速下的气泡喷射和气体交换率进行定量建模。 这将允许在更大的尺度上比较这些重要过程的模型。 将使用传统方法获得的水样以及系泊氧传感器和总气体装置的惰性气体分析结果进行比较，以评价采样器性能和改进模型。

9302812 JENKINS Understanding of the physical processes affecting gases in the upper ocean is important for quantifying biogeochemical cycles in the upper ocean. Time series measurements of dissolved gas concentrations in the upper ocean, which respond to changes in atmosphere-ocean "forcing" have proven effective in studying gas exchange rates. This project will develop and deploy a moored sequential noble gas sampling system which will permit the determination of a time series of noble gas concentrations at several depths in the near surface. The device will be capable of obtaining between 50 and 100 samples at predetermined time intervals over a course of days to months (as dictated by the scientific program). Samples would be processed in the laboratory using a self-contained, automated vacuum system which would sequentially extract and analyze the stored samples. The noble gases (He,Ne,Ar and Kr) will be analyzed to document the time evolution of gas concentrations during high wind events, permitting the quantitative modeling of bubble injection and gas exchange rates at those wind speeds. This will permit the comparison of models of these important processes on larger scales. Comparison of results with noble gas analyses of conventionally obtained water samples, as well as moored oxygen sensor and total gas devices will be used to evaluate sampler performance and refine models.