Marine productivity estimates from continuous O2/Ar ratio measurements by membrane inlet mass spectrometry
Marine productivity estimates from continuous O2/Ar ratio measurements by membrane inlet mass spectrometry
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DOI：
10.1029/2005gl023459
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发表时间：
2005-10
影响因子：
5.2
通讯作者：
J. Kaiser;M. Reuer;Bruce A. Barnett;M. Bender
中科院分区：
文献类型：
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作者：
J. Kaiser;M. Reuer;Bruce A. Barnett;M. Bender
海洋混合层中溶解氧/氩（O2/Ar）的比值反映了净群落产量（NCP），因为O2和Ar具有相似的物理溶解度特性，但只有O2是生物产生和消耗的。我们描述了一种膜入口质谱仪（MIMS），它允许对O2/Ar比率和其他气体进行连续高精度的船上分析，并使用实验室分析的离散样品进行校准。我们还提供了东赤道太平洋的O2/Ar数据。短期重现性为0.05%。经向梯度和小尺度现象得到了清晰的解决。赤道周围O2/Ar欠饱和反映了生物和物理强迫的相互作用。从风速-气体交换参数化估计的混合层NCP在2.75°N以北接近零，在6.75°S以南约为12 mmol m - 2 d - 1。根据MIMS O2/Ar测量和伴随的O2浓度测量计算出的Ar过饱和度范围为- 0.8至+3.0%。
Dissolved oxygen/argon (O2/Ar) ratios in the oceanic mixed layer are indicative of net community production (NCP) because O2 and Ar share similar physical solubility properties, but only O2 is biologically produced and consumed. We describe a membrane inlet mass spectrometer (MIMS) that allows continuous high‐precision shipboard analysis of O2/Ar ratios and eventually other gases, calibrated with discrete samples analyzed in the laboratory. We also present O2/Ar data from the eastern equatorial Pacific. Short‐term reproducibilities of 0.05% were achieved. Meridional gradients and small‐scale phenomena were clearly resolved. O2/Ar undersaturations around the equator reflect the interaction of biological and physical forcings. Mixed‐layer NCP estimated from wind speed‐gas exchange parameterizations was near zero north of 2.75°N, and about 12 mmol m−2 d−1 south of 6.75°S. Ar supersaturations, calculated from MIMS O2/Ar measurements and accompanying O2 concentration measurements, ranged from −0.8 to +3.0%.