Representation of the Antarctic Circumpolar Current in the CMIP5 climate models and future changes under warming scenarios
Representation of the Antarctic Circumpolar Current in the CMIP5 climate models and future changes under warming scenarios
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DOI：
10.1029/2012jc008412
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发表时间：
2012-12-11
影响因子：
3.6
通讯作者：
Wang, Z.
中科院分区：
文献类型：
--
作者：
Meijers, A. J. S.;Shuckburgh, E.;Wang, Z.
在第五次耦合模式相互比较项目（CMIP 5）中，南极绕极流（ACC）的代表性总体上比CMIP 3有所改善。与CMIP 3（33-337 Sv）相比，历史（1976-2006）情景中模拟运输的范围减少（90-264 Sv），平均值为155 +/- 51 Sv。大的模型间范围与ACC密度结构的显着差异有关。ACC的位置在大多数纬度上都是准确的，平均纬度的标准偏差很小（1.27度）。驱动ACC的西风急流偏北太强，平均偏北太远。与CMIP 3不同，模拟的ACC纬度和西风急流的位置之间没有相关性。在未来的气候强迫情景下（2070-2099年平均），模拟的ACC传输变化在-26到+ 17 Sv之间，并且在传输增加（减少）的模式中，ACC向极（赤道方向）移动。西风急流的位置变化与ACC的位置变化没有明显的相关性，西风急流的位置变化是向北移动并增强的。副极地涡旋面积的变化随模式的不同而不同，副极地涡旋向南扩展并加强。副极地环流面积的增加对应于ACC输送量的减少和ACC位置的向赤道移动，反之亦然的环流面积的收缩。在1000米以上，特别是ACC核心的赤道方向，密度普遍下降。引文：Meijers，A. J. S.，E. Shuckburgh，N. Bruneau，J.- B。Sallee，T. J. Bracegirdle和Z. Wang（2012），CMIP 5气候模式中南极绕极流的表示和变暖情景下的未来变化，J. Geophys。结果：117，C12008，doi：10.1029/2012JC 008412。
The representation of the Antarctic Circumpolar Current (ACC) in the fifth Coupled Models Intercomparison Project (CMIP5) is generally improved over CMIP3. The range of modeled transports in the historical (1976-2006) scenario is reduced (90-264 Sv) compared with CMIP3 (33-337 Sv) with a mean of 155 +/- 51 Sv. The large intermodel range is associated with significant differences in the ACC density structure. The ACC position is accurately represented at most longitudes, with a small (1.27 degrees) standard deviation in mean latitude. The westerly wind jet driving the ACC is biased too strong and too far north on average. Unlike CMIP3 there is no correlation between modeled ACC latitude and the position of the westerly wind jet. Under future climate forcing scenarios (2070-2099 mean) the modeled ACC transport changes by between -26 to + 17 Sv and the ACC shifts polewards (equatorwards) in models where the transport increases (decreases). There is no significant correlation between the ACC position change and that of the westerly wind jet, which shifts polewards and strengthens. The subtropical gyres strengthen and expand southwards, while the change in subpolar gyre area varies between models. An increase in subpolar gyre area corresponds with a decreases in ACC transport and an equatorward shift in the ACC position, and vice versa for a contraction of the gyre area. There is a general decrease in density in the upper 1000 m, particularly equatorwards of the ACC core. Citation: Meijers, A. J. S., E. Shuckburgh, N. Bruneau, J.-B. Sallee, T. J. Bracegirdle, and Z. Wang (2012), Representation of the Antarctic Circumpolar Current in the CMIP5 climate models and future changes under warming scenarios, J. Geophys. Res., 117, C12008, doi:10.1029/2012JC008412.