Modeling transport and fate of riverine dissolved organic carbon in the Arctic Ocean
Modeling transport and fate of riverine dissolved organic carbon in the Arctic Ocean
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模拟北冰洋河流溶解有机碳的运输和归宿
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
B. Peterson
中科院分区：
文献类型：
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作者：
M. Manizza;M. Follows;S. Dutkiewicz;J. McClelland;D. Menemenlis;C. Hill;A. Townsend‐Small;B. Peterson
河流溶解有机碳（DOC）在北极的空间分布和命运可能是重要的区域碳循环，但很难充分利用稀疏的观测单独表征。该区域环流和地球化学循环的数值模型有助于解释和推断数据，并可能最终应用于全球变化敏感性研究。在这里，我们开发和探索一个区域性的，三维的北冰洋模型，在其中，我们第一次明确地表示河流DOC的来源与季节性排放的基础上气候场估计。通过一套数值实验，我们探索了DOC样示踪剂的分布与现实的河流来源和一个简单的线性衰减代表通过微生物降解的矿化。该模型再现了DOC示踪剂寿命约为10年时在北极盆地东部和西部观察到的DOC-盐度关系的斜率，与已发表的现场数据推断一致。新的河流DOC经验参数化和区域环流模式为区域和全球变化研究提供了新的工具。
The spatial distribution and fate of riverine dissolved organic carbon (DOC) in the Arctic may be significant for the regional carbon cycle but are difficult to fully characterize using the sparse observations alone. Numerical models of the circulation and biogeochemical cycles of the region can help to interpret and extrapolate the data and may ultimately be applied in global change sensitivity studies. Here we develop and explore a regional, three‐dimensional model of the Arctic Ocean in which, for the first time, we explicitly represent the sources of riverine DOC with seasonal discharge based on climatological field estimates. Through a suite of numerical experiments, we explore the distribution of DOC‐like tracers with realistic riverine sources and a simple linear decay to represent remineralization through microbial degradation. The model reproduces the slope of the DOC‐salinity relationship observed in the eastern and western Arctic basins when the DOC tracer lifetime is about 10 years, consistent with published inferences from field data. The new empirical parameterization of riverine DOC and the regional circulation and biogeochemical model provide new tools for application in both regional and global change studies.