High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data
High resolution (1 km) positive degree-day modelling of Greenland ice sheet surface mass balance, 1870-2012 using reanalysis data
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DOI：
10.1017/jog.2016.133
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发表时间：
2017-02
影响因子：
3.4
通讯作者：
D. Wilton;A. Jowett;Edward Hanna;G. Bigg;M. Broeke;X. Fettweis;P. Huybrechts
中科院分区：
文献类型：
--
作者：
D. Wilton;A. Jowett;Edward Hanna;G. Bigg;M. Broeke;X. Fettweis;P. Huybrechts
我们显示了格陵兰冰盖（GrIS）表面质量平衡（SMB）的正度日（PDD）模型的结果，1870-2012年，强制再分析数据。与以前的版本相比，该模式包括改进的每日温度参数化，并以1公里而不是5公里的分辨率运行。这些改进总体上导致了具有相同强制数据的更高SMB。我们还比较了我们的模型与两个区域气候模式（RCMs）的结果。虽然我们的PDD模型和RCMs之间有很好的定性一致性，但它通常会导致更少的降水和更少的径流，但近似相等的SMB：平均1979-2012 SMB（±标准差），在Gt a-1中，PDD模型为382 ± 78，而RCMs为379 ± 101和425 ± 90。与SMB现场观测结果的比较表明，在某些地区，区域协调机制在地方一级可能比项目设计数据更准确，尽管后者一般比较好。将GrIS划分为七个流域，我们发现SMB自2000年以来在所有地区急剧下降。最后，我们表明径流接近两个产犊冰川和产犊前撤退或产犊通量之间的相关性，这是最显着的从20世纪90年代中期。© The Author（s）2016.
We show results from a positive degree-day (PDD) model of Greenland ice sheet (GrIS) surface mass balance (SMB), 1870-2012, forced with reanalysis data. The model includes an improved daily temperature parameterization as compared with a previous version and is run at 1 km rather than 5 km resolution. The improvements lead overall to higher SMB with the same forcing data. We also compare our model with results from two regional climate models (RCMs). While there is good qualitative agreement between our PDD model and the RCMs, it usually results in lower precipitation and lower runoff but approximately equivalent SMB: mean 1979-2012 SMB (± standard deviation), in Gt a-1, is 382 ± 78 in the PDD model, compared with 379 ± 101 and 425 ± 90 for the RCMs. Comparison with in situ SMB observations suggests that the RCMs may be more accurate than PDD at local level, in some areas, although the latter generally compares well. Dividing the GrIS into seven drainage basins we show that SMB has decreased sharply in all regions since 2000. Finally we show correlation between runoff close to two calving glaciers and either calving front retreat or calving flux, this being most noticeable from the mid-1990s. © The Author(s) 2016.