Representation of the Weddell Sea deep water masses in the ocean component of the NCAR-CCSM model
Representation of the Weddell Sea deep water masses in the ocean component of the NCAR-CCSM model
复制标题
NCAR-CCSM 模型海洋部分中威德尔海深水团的表示
作者：
R. Kerr;I. Wainer;M. Mata
摘要我们使用国家大气研究中心社区气候系统模式(NCAR-CCSM)的海洋部分，根据三个不同模式的结果检验了韦德尔海深水质量的分布。一次运行是由修正的NCAR/NCEP通量年际强迫进行的，另外两次运行是由同一气候学获得的年度循环强迫进行的。后者的一个运行包括一个互动的海冰模型。应用最佳多参数分析分离格林威治子午线部分的深水团(仅进入韦德尔海)，以衡量在模拟中获得的逼真程度。首先，我们用观测到的水型指数描述了模拟的深水团的分布。由于观测到的指数没有如预期那样提供可接受的韦德尔海深水团，因此针对每个模拟进行了专门的调整。三个模拟中水团表示的差异通过它们的均方根差异来量化。结果指出，需要更好地表示(和包括)与冰有关的过程，以便在NCAR-CCSM模式的输出中，以及可能在其他海洋和气候模式中，改善南大洋密集水团的海洋特征和可变性。
Abstract We examine Weddell Sea deep water mass distributions with respect to the results from three different model runs using the oceanic component of the National Center for Atmospheric Research Community Climate System Model (NCAR-CCSM). One run is inter-annually forced by corrected NCAR/NCEP fluxes, while the other two are forced with the annual cycle obtained from the same climatology. One of the latter runs includes an interactive sea-ice model. Optimum Multiparameter analysis is applied to separate the deep water masses in the Greenwich Meridian section (into the Weddell Sea only) to measure the degree of realism obtained in the simulations. First, we describe the distribution of the simulated deep water masses using observed water type indices. Since the observed indices do not provide an acceptable representation of the Weddell Sea deep water masses as expected, they are specifically adjusted for each simulation. Differences among the water masses’ representations in the three simulations are quantified through their root-mean-square differences. Results point out the need for better representation (and inclusion) of ice-related processes in order to improve the oceanic characteristics and variability of dense Southern Ocean water masses in the outputs of the NCAR-CCSM model, and probably in other ocean and climate models.