Surface mass balance and energy balance of the 79N Glacier (Nioghalvfjerdsfjorden, NE Greenland) modeled by linking COSIPY and Polar WRF
Surface mass balance and energy balance of the 79N Glacier (Nioghalvfjerdsfjorden, NE Greenland) modeled by linking COSIPY and Polar WRF
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DOI：
10.1017/jog.2021.56
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发表时间：
2021-12-01
影响因子：
3.4
通讯作者：
Molg, T.
中科院分区：
文献类型：
--
作者：
Blau, M. T.;Turton, J. V.;Molg, T.
为了更好地了解格陵兰岛东北部冰流最大的出口冰川79 N冰川（Nioghalvfjerdsfjorden冰川）的大气驱动质量变化，通过将PYthon（COSIPY）中的COupled Snowpack和Ice表面能量和质量平衡模型与2014-2018年区域大气模型（Polar WRF）的输出联系起来，对表面质量平衡（SMB）进行建模。经过手动模型优化后，与该地区的观测值和文献值相比，该模型产生了可靠的结果。高空间分辨率（1公里）的模拟揭示了强大的年际变化的SMB。在质量损失较高的年份（2016年和2017年），更强的表面融化增加了消融和径流，而在其他年份（2015年和2018年），积雪内的融化和再冻结主导了质量平衡（MB）。在2018年消融期间，较冷的区域气候伴随着更高的降雪驱动积累，更高的降雨量和减少的表面融化，导致2018年的SMB为正值，然而，年度总MB仍然为负值。结果表明，一个有前途的新数据集，获得更多的洞察质量平衡过程及其对格陵兰岛东北部冰川退缩加速的贡献。
To get a better overview of atmosphere-driven mass changes at the 79N Glacier (Nioghalvfjerdsfjorden Glacier), the largest outlet glacier of the northeast Greenland ice stream, the surface mass balance (SMB) is modeled by linking the COupled Snowpack and Ice surface energy and mass-balance model in PYthon (COSIPY) with the output of a regional atmospheric model (Polar WRF) for the years 2014-2018. After a manual model optimization, the model produces reliable results when compared to observations in the region and to values from the literature. High spatial resolution (1 km) simulations reveal strong interannual variability of the SMB. Stronger surface melting increased the ablation and runoff in years with high mass loss (2016 and 2017) whereas in other years (2015 and 2018) melting and refreezing inside the snowpack dominated the mass balance (MB). A cooler regional climate with higher snowfall-driven accumulation, higher albedo and reduced surface melt in the ablation period of 2018 resulted in a positive SMB in 2018, however, the annual total MB remained negative. The results suggest a promising new dataset for gaining more insights into mass-balance processes and their contribution to the acceleration of glacier retreat in northeast Greenland.