How Choice of Depth Horizon Influences the Estimated Spatial Patterns and Global Magnitude of Ocean Carbon Export Flux
How Choice of Depth Horizon Influences the Estimated Spatial Patterns and Global Magnitude of Ocean Carbon Export Flux
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DOI：
10.1029/2017gl076498
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发表时间：
2018-05
影响因子：
5.2
通讯作者：
H. Palevsky;S. Doney
中科院分区：
文献类型：
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作者：
H. Palevsky;S. Doney
海洋碳输出通量的估计速率和效率对用于定义输出的深度范围的差异很敏感，而不同的方法学方法通常会有所不同。我们使用一系列常用的深度范围来评估全球地球系统模型中下沉颗粒有机碳（POC）通量率和效率（e-ratios）：季节性混合层深度、颗粒补偿深度、亮光带底部、100 m 的固定深度范围和最大年度混合层深度。在这个单一的动态一致模型框架内，在不同的深度范围选择中，全局 POC 通量率变化 30%，全局 e 比率变化 21%。由于副极地地区深冬混合的显着影响，POC 通量和 e 比的区域变化也取决于输出深度范围。协调相互矛盾的出口估计的努力需要考虑到不同深度范围选择造成的系统性差异。
Estimated rates and efficiency of ocean carbon export flux are sensitive to differences in the depth horizons used to define export, which often vary across methodological approaches. We evaluate sinking particulate organic carbon (POC) flux rates and efficiency (e‐ratios) in a global earth system model, using a range of commonly used depth horizons: the seasonal mixed layer depth, the particle compensation depth, the base of the euphotic zone, a fixed depth horizon of 100 m, and the maximum annual mixed layer depth. Within this single dynamically consistent model framework, global POC flux rates vary by 30% and global e‐ratios by 21% across different depth horizon choices. Zonal variability in POC flux and e‐ratio also depends on the export depth horizon due to pronounced influence of deep winter mixing in subpolar regions. Efforts to reconcile conflicting estimates of export need to account for these systematic discrepancies created by differing depth horizon choices.