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首页> 外文期刊>The Cryosphere >Sensitivity of Greenland Ice Sheet surface mass balance to perturbations in sea surface temperature and sea ice cover: a study with the regional climate model MAR
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Sensitivity of Greenland Ice Sheet surface mass balance to perturbations in sea surface temperature and sea ice cover: a study with the regional climate model MAR

机译：格陵兰冰原表面质量平衡对海面温度和海冰覆盖扰动的敏感性：区域气候模型MAR的研究

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摘要

During recent summers (2007–2012), several surface melt records were brokenover the Greenland Ice Sheet (GrIS). The extreme summer melt resulted in partfrom a persistent negative phase of the North Atlantic Oscillation (NAO),favoring warmer atmospheric conditions than normal over the GrIS.Simultaneously, large anomalies in sea ice cover (SIC) and sea surfacetemperature (SST) were observed in the North Atlantic, suggesting a possibleconnection. To assess the direct impact of 2007–2012 SIC and SST anomalieson GrIS surface mass balance (SMB), a set of sensitivity experiments wascarried out with the regional climate model MAR forced by ERA-Interim. Thesesimulations suggest that perturbations in SST and SIC in the seas surroundingGreenland do not considerably impact GrIS SMB, as a result of the katabaticwind blocking effect. These offshore-directed winds prevent oceanicnear-surface air, influenced by SIC and SST anomalies, from penetrating farinland. Therefore, the ice sheet SMB response is restricted to coastalregions, where katabatic winds cease. A topic for further investigation ishow anomalies in SIC and SST might have indirectly affected the surface meltby changing the general circulation in the North Atlantic region, hencefavoring more frequent warm air advection towards the GrIS.
机译：在最近的夏季（2007-2012年），格陵兰冰原（GrIS）上打破了一些表面融化记录。夏季的极端融化部分是由于北大西洋涛动（NAO）持续的负相造成的，这有利于GrIS的大气条件比正常温暖。同时，在2006年观测到海冰盖（SIC）和海面温度（SST）的大异常。北大西洋，暗示可能存在联系。为了评估2007-2012年SIC和SST异常对GrIS表面质量平衡（SMB）的直接影响，利用ERA-Interim强迫的区域气候模型MAR进行了一套敏感性实验。这些模拟表明，由于风电场的阻风作用，格陵兰岛周围海域的SST和SIC扰动不会对GrIS SMB产生重大影响。这些海上风将阻止受SIC和SST异常影响的近海洋洋空气渗透到遥远的陆地。因此，冰盖SMB的响应仅限于沿海地区，那里的方正风停止了。 SIC和SST异常可能如何通过改变北大西洋地区的整体环流间接影响表面融化，从而有利于向GrIS进行更频繁的平流，这是一个需要进一步研究的话题。

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