Estimating and Modeling Air-sea Gas Fluxes in the Southern Ocean

该项目是对南极绕极洋流和南大洋中可溶气体--特别是氯氟烃(氟氯化碳)、二氧化碳和氧气--的海气通量控制机制的研究。这项研究有三个目标：(1)更好地了解中尺度海洋过程对示踪剂输送的影响，以及如何在粗分辨率模式中表示这些过程；(2)开发一种评估海-气通量的创新诊断方法，其根源在于我们对海-气通量、海洋输送和生物地球化学转化之间的关系的理解，以及(3)将这一方法与南大洋生物地球化学循环的显式模式进行比较，并将其应用于观测，以产生独立的估计气-海碳和氧通量。这一模型目前用理想化的参数表示关键的生物地球化学过程，但这些足以对这一诊断方法的基本假设进行初步测试。全球生物地球化学模型的继续发展将与这项诊断工作并行进行。该方法在补充现有南极绕极流海气通量估算方法方面具有很大的实用价值。它将对物理和生物地球化学过程之间的联系提供明确的描述，并将从总体上显著改善此类模型的预测能力。

This project is a study of the mechanisms controlling the air-sea flux of soluble gases - in particular chlorofluorocarbons (CFC's), carbon dioxide, and oxygen - in the Antarctic Circumpolar Current and the Southern Ocean. There are three objectives to the study: (1) a better understanding of the influence of mesoscale oceanic processes on tracer transport, and how to represent those processes in coarse resolution models; (2) the development of an innovative diagnostic approach to evaluating air-sea gas fluxes rooted in our understanding of the relationship between air-sea fluxes, ocean transports and biogeochemical transformations, and (3) testing this approach against explicit models of southern ocean biogeochemical cyclesand apply it to observations to yield independent estimates air-sea carbon and oxygen flux.An existing global model will be used as a testbed. This model currently represents key biogeochemical processes with idealized parameterizations, however these are sufficient for an initial test of the basic assumptions of this diagnostic approach. The continued development of the global biogeochemical model will occur in parallel with this diagnostic work. This approach has great potential practical utility in supplementing current methods of estimating air-sea gas fluxes in the Antarctic Circumpolar Current. It will provide an explicit description of the connections between physical and biogeochemical processes, and will significantly improve the prognostic capabilities of such models in general.