An efficient regional energy-moisture balance model for simulation of the Greenland Ice Sheet response to climate change
An efficient regional energy-moisture balance model for simulation of the Greenland Ice Sheet response to climate change
复制标题
用于模拟格陵兰冰盖对气候变化响应的有效区域能量-水分平衡模型
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Ganopolski
中科院分区：
文献类型：
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作者：
A. Robinson;R. Calov;A. Ganopolski
抽象的。为了探讨格陵兰冰盖在长时间尺度(百年到几千年)上对气候变化的响应，建立了一个区域能量-水分平衡模式。该模式模拟了格陵兰上空温度和降水的季节变化，并明确考虑了海拔和反照率的反馈。根据这些场，可以确定年平均表面温度和表面质量平衡，并将其用于强制冰盖模型。地表物质平衡的熔融分量在这里是使用正度日方法和更基于物理的替代方法来计算的，该方法明确地包括了日照和反照率。作为对气候模型的验证，我们首先模拟了格陵兰岛上的温度和降水，以确定目前的地形。我们的模拟气候学与观测值相比很好，与以前许多模拟中使用的简单参数化法没有显著差异。此外，使用两种熔融方案计算的地表质量平衡都在最近的区域气候模式结果的范围内。对于规定的无冰状态，区域能量-水分平衡模式和简单的参数化模式在模拟气候学方面的差异变得显著，我们的模式显示出更强的夏季变暖。当与三维冰盖模型相耦合并根据当前条件进行初始化时，这两个融化方案都允许对当今地理信息系统进行逼真的模拟。
Abstract. In order to explore the response of the Greenland ice sheet (GIS) to climate change on long (centennial to multi-millennial) time scales, a regional energy-moisture balance model has been developed. This model simulates seasonal variations of temperature and precipitation over Greenland and explicitly accounts for elevation and albedo feedbacks. From these fields, the annual mean surface temperature and surface mass balance can be determined and used to force an ice sheet model. The melt component of the surface mass balance is computed here using both a positive degree day approach and a more physically-based alternative that includes insolation and albedo explicitly. As a validation of the climate model, we first simulated temperature and precipitation over Greenland for the prescribed, present-day topography. Our simulated climatology compares well to observations and does not differ significantly from that of a simple parameterization used in many previous simulations. Furthermore, the calculated surface mass balance using both melt schemes falls within the range of recent regional climate model results. For a prescribed, ice-free state, the differences in simulated climatology between the regional energy-moisture balance model and the simple parameterization become significant, with our model showing much stronger summer warming. When coupled to a three-dimensional ice sheet model and initialized with present-day conditions, the two melt schemes both allow realistic simulations of the present-day GIS.