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首页> 外文期刊>The Cryosphere >Unprecedented atmospheric conditions (1948–2019) drive the 2019 exceptional melting season over the Greenland ice sheet
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Unprecedented atmospheric conditions (1948–2019) drive the 2019 exceptional melting season over the Greenland ice sheet

机译：前所未有的大气条件（1948-2019）在格陵兰冰板上驾驶2019年出色的融化季节

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Understanding the role of atmospheric circulation anomalies on the surface mass balance of the Greenland ice sheet (GrIS) is fundamental for improving estimates of its current and future contributions to sea level rise. Here, we show, using a combination of remote sensing observations, regional climate model outputs, reanalysis data, and artificial neural networks, that unprecedented atmospheric conditions (1948–2019) occurring in the summer of 2019 over Greenland promoted new record or close-to-record values of surface mass balance (SMB), runoff, and snowfall. Specifically, runoff in 2019 ranked second within the 1948–2019 period (after 2012) and first in terms of surface mass balance negative anomaly for the hydrological year 1?September?2018–31?August?2019. The summer of 2019 was characterized by an exceptional persistence of anticyclonic conditions that, in conjunction with low albedo associated with reduced snowfall in summer, enhanced the melt–albedo feedback by promoting the absorption of solar radiation and favored advection of warm, moist air along the western portion of the ice sheet towards the north, where the surface melt has been the highest since 1948. The analysis of the frequency of daily 500 hPa geopotential heights obtained from artificial neural networks shows that the total number of days with the five most frequent atmospheric patterns that characterized the summer of 2019 was 5 standard deviations above the 1981–2010 mean, confirming the exceptional nature of the 2019 season over Greenland.
机译：了解大气循环异常在格陵兰冰盖（GRIS）表面质量平衡上的作用是改善其当前和未来贡献对海平面上升的估计的基础。在这里，我们展示了遥感观察，区域气候模型产出，再分析数据和人工神经网络的组合，即在2019年夏天发生的前所未有的大气条件（1948-2019）在格陵兰促进了新的记录或近距离-Record的表面质量平衡（SMB），径流和降雪的值。具体而言，2019年的径流在1948 - 2019年期间排名第二（2012年后），并首先在水文年度的表面质量平衡负异常1？9月？2018-31？八月？2019年。 2019年夏天的特点是反气旋条件的特殊持续存在，即通过夏季降低降雪的低反玻璃，通过促进太阳辐射的吸收，增强了熔融 - 反应的反馈，并赞成沿着温暖，潮湿空气的平流朝北的西部冰盖，从1948年以来，表面熔化是最高的。从人工神经网络获得的每日500 HPA地球势高度的频率分析表明，总常见的大气的总天数其特征在2019年夏天的模式是1981 - 2010年均值的5个标准偏差，确认了2019年在格陵兰岛的卓越性。

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