Climate impacts of systematic errors in the simulation of the path of the North Atlantic Current
Climate impacts of systematic errors in the simulation of the path of the North Atlantic Current
复制标题
北大西洋洋流路径模拟中系统误差对气候的影响
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
F. Bryan
中科院分区：
文献类型：
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作者：
S. Weese;F. Bryan
在耦合气候系统模式的海洋分量中采用压力场调整的实验在仅海洋和耦合实验中进行，以评估减少北大西洋洋流系统误差的气候影响。这种保守和绝热的调整过程大大降低了北大西洋SST偏差，并在两种模式配置中局部逆转了相关的表面热通量平衡。冰浓度在拉布拉多海增加的海洋表面热通量的位移的调整。在下游，在北欧海域，次表层海洋对这种调整反应良好，因为潜在温度和盐度的垂直剖面向观测结果收敛。大气驻波模式显示出适度的改善，冰岛低层的深度略有减弱。耦合模式框架中进一步未解决的错误可能会导致北大西洋继续存在偏差。
Experiments employing an adjustment of the pressure field in the ocean component of a coupled climate system model are undertaken in both ocean‐only and coupled experiments to assess the climatic impacts of reducing the systematic errors in the North Atlantic Current. This conservative and adiabatic adjustment process substantially decreases North Atlantic Ocean SST biases and locally reverses the associated surface heat flux balance in both model configurations. Ice concentrations in the Labrador Sea increase as the oceanic surface heat fluxes are displaced by the adjustment. Downstream, in the Nordic Seas, the subsurface ocean responds favorably to this adjustment, as the vertical profiles of potential temperature and salinity converge towards the observations. Atmospheric stationary wave patterns show a modest improvement, with a slight weakening of the excessively deep Icelandic low. Further unresolved errors in the coupled model framework potentially contribute to the continued presence of biases in the North Atlantic.