Seasonal variation of snow-surface elevation in North Greenland as modeled and detected by satellite radar altimetry
Seasonal variation of snow-surface elevation in North Greenland as modeled and detected by satellite radar altimetry
复制标题
卫星雷达测高模拟和检测的北格陵兰雪面海拔季节变化
作者：
Jun Li;H. Zwally;H. Cornejo;D. Yi
由积雪-加密化-高程模式得到的地面高程季节变化分布与由ERS-1/-2卫星雷达测高得到的观测高程变化进行了比较，结果表明，北格陵兰冰盖上的变化幅度模式非常相似。季节变化的幅度由西向东、由南向北递减，主要受积累率和地表温度分布型的影响。比较了几种估计观测中季节变化幅度的方法，包括使用从模拟的不对称季节变化中推导出的三频正弦函数。由此得到的用三频函数估计的观测幅度与建模的幅度之间的相关系数为0.66，斜率为0.7。残差可能是由积累量和温度的年际变化以及模式中的其他近似引起的。
Abstract Comparison of the distribution of seasonal variations in surface elevation derived from a firn-densification–elevation model with observed variations derived from ERS-1/-2 satellite radar altimetry shows close similarity in the patterns of the amplitude of the variations over the North Greenland ice sheet. The amplitudes of the seasonal variations decrease from west to east and from south to north, determined by the accumulation rate and the surface-temperature distribution pattern. Several methods of estimating the amplitude of the seasonal variation in the observations are compared, including the use of a three-frequency sinusoidal function derived from the modeled seasonal variation that is asymmetric. The resulting correlation coefficient between the observed amplitude, estimated with the three-frequency function, and the modeled amplitude is 0.66 and the slope is 0.7. Residual differences may be caused by interannual variability in accumulation and temperature and other approximations in the model.