The Influence of the Amundsen–Bellingshausen Seas Low on the Climate of West Antarctica and Its Representation in Coupled Climate Model Simulations
The Influence of the Amundsen–Bellingshausen Seas Low on the Climate of West Antarctica and Its Representation in Coupled Climate Model Simulations
复制标题
阿蒙森-别林斯高晋海低压对南极洲西部气候的影响及其在耦合气候模型模拟中的表现
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发表时间：
2013
期刊：
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通讯作者：
T. Phillips
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文献类型：
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作者：
J.;S. Hosking;A. Orr;Gareth;Marshall;J. Turner;T. Phillips
与早期的研究相比，作者通过去除背景区域平均海平面压力（MSLP），根据其相对（而不是实际）中心压力描述了南大洋南太平洋部分上空存在的气候深低压系统，称为阿蒙森-别林斯高晋海低压系统（ABSL）。这样做可以消除整个ABSL扇区的大规模变化的影响（例如，由于南部环模），从而可以更清楚地了解ABSL变化及其对南极洲西部区域气候的影响。利用ECMWF中期再分析(ERA-Interim)场，1979年至2011年期间ABSL相对中心压力的年周期显示出冬季(夏季)的最小值(最大值)，这与早期基于实际中心压力的研究有很大不同，这表明存在半年振荡。 ABSL纵向位置的年周期对背景气压不敏感，显示其从 向西移动； 250 8 至 ; 220 8 E 夏季和冬季之间，与早期研究一致。作者通过量化其对关键气象参数的影响，证明了ABSL的变化，特别是其纵向位置，在控制西南极洲和周围海洋的表面气候方面发挥着重要作用。对使用历史强迫运行的 17 个 CMIP5 气候模型中的 ABSL 年度周期进行的检查表明，大多数模型都有明确的偏差，特别是在纵向位置方面，并且相应地对西南极洲气候的代表性较差。
In contrast to earlier studies, the authors describe the climatological deep low pressure system that exists over the South Pacific sector of the Southern Ocean, referred to as the Amundsen–Bellingshausen Seas low (ABSL), in terms of its relative (rather than actual) central pressure by removing the background area- averaged mean sea level pressure (MSLP). Doing so removes much of the influence of large-scale variability across the ABSL sector region (e.g., due to the southern annular mode), allowing a clearer understanding of ABSL variability and its effect on the regional climate of West Antarctica. Using ECMWF Interim ReAnalysis (ERA-Interim) fields, the annual cycle of the relative central pressure of the ABSL for the period from 1979 to 2011 shows a minimum (maximum) during winter (summer), differing considerably from the earlier studies based on actual central pressure, which suggests a semiannual oscillation. The annual cycle of the longitudinal position of the ABSL is insensitive to the background pressure, and shows it shifting westward from ; 250 8 to ; 220 8 E between summer and winter, in agreement with earlier studies. The authors demonstrate that ABSL variability, and in particular its longitudinal position, play an important role in controlling the surface climate of West Antarctica and the surrounding ocean by quantifying its influence on key meteorological parameters. Examination of the ABSL annual cycle in 17 CMIP5 climate models run with historical forcing shows that the majority of them have definite biases, especially in terms of longitudinal position, and a correspondingly poor representation of West Antarctic climate.