Climate and surface mass balance of coastal West Antarctica resolved by regional climate modelling

Climate and surface mass balance of coastal West Antarctica resolved by regional climate modelling
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通过区域气候模型解决南极洲西部沿海的气候和表面质量平衡

DOI:
10.1017/aog.2017.42
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发表时间:
2017
影响因子:
2.9
通讯作者:
Lenaerts J
Lenaerts J
中科院分区:
地球科学4区
文献类型:
--
作者:
Lenaerts J

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南极西部气候和表面质量平衡(SMB)记录很少。为了填补这一空白,区域大气气候模型是有用的,前提是此类模型以足够高的水平分辨率使用并与雪模型结合使用。在这里,我们展示了 1979 年至 2015 年期间南极洲西部沿海的高分辨率(5.5 公里)区域大气气候模型 (RACMO2) 模拟结果。我们利用现有的现场天气观测、地表融化的遥感估计以及来自雷达和冷杉核心的 SMB 估计来评估结果。此外,还将结果与低分辨率版本的结果进行比较,以评估分辨率的附加值。高分辨率模型解决了地形引起的小规模气候变化,例如冰架接地区域相对温暖的条件和当地风速加速度。 RACMO2 可以很好地再现表面熔化和 SMB。该数据集将有助于选择冰芯位置、将海拔变化转换为质量变化、驱动海洋、冰盖和耦合模型,以及将西南极冰盖和陆架的变化归因于大气强迫的变化。
West Antarctic climate and surface mass balance (SMB) records are sparse. To fill this gap, regional atmospheric climate modelling is useful, providing that such models are employed at sufficiently high horizontal resolution and coupled with a snow model. Here we present the results of a high-resolution (5.5 km) regional atmospheric climate model (RACMO2) simulation of coastal West Antarctica for the period 1979–2015. We evaluate the results with available in situ weather observations, remote-sensing estimates of surface melt, and SMB estimates derived from radar and firn cores. Moreover, results are compared with those from a lower-resolution version, to assess the added value of the resolution. The high-resolution model resolves small-scale climate variability invoked by topography, such as the relatively warm conditions over ice-shelf grounding zones, and local wind speed accelerations. Surface melt and SMB are well reproduced by RACMO2. This dataset will prove useful for picking ice core locations, converting elevation changes to mass changes, for driving ocean, ice-sheet and coupled models, and for attributing changes in the West Antarctic Ice Sheet and shelves to changes in atmospheric forcing.
极地冰芯中过氧化氢的季节变化
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DOI: --
发表时间: 2006
期刊:
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N. Bertler;T. Naish;P. A. Mayewski;P. Barrett
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发表时间: 2014-01-01
影响因子: 3.4
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通讯作者: Vaughan, David G.