Relating air temperatures to the depletion of snow covered area in a Himalayan basin
Relating air temperatures to the depletion of snow covered area in a Himalayan basin
复制标题
DOI：
10.2166/nh.2003.0007
复制
发表时间：
2003-08
影响因子：
2.7
通讯作者：
P. Singh;L. Bengtsson;R. Berndtsson
中科院分区：
文献类型：
--
作者：
P. Singh;L. Bengtsson;R. Berndtsson
已经概述并测试了使用平均气温评估积雪面积（SCA）损耗的程序。由于积雪消耗是积雪区域及其周围气候条件的累积效应，因此附近站点的累积平均温度（CTM）应代表 SCA 的消耗。该研究针对位于喜马拉雅山西部地区的 Satluj 盆地（22,305 km(2)）进行。融化在3月初左右开始，因此，计算CTM的参考日期被认为是3月1日。使用三个消融季节（1987-1989）的数据来建立SCA和CTM之间的关系。结果发现，SCA 的消耗与 CTM 呈指数相关（R-2 > 0.98）。 SCA 的指数减少可以根据山区盆地的积雪分布来解释。该方法有可能估计缺失数据并扩展每日、每周或每月的时间序列。一旦在融化季节第一部分的盆地中确定了消耗趋势，就可以使用融化季节剩余时期的 CTM 数据来高精度地模拟 SCA。此类应用可以减少获取 SCA 信息所需的卫星图像数量。还可以使用预测的气温来预测 SCA。气候变化对融化期间SCA消耗的影响表明，在考虑的温度升高范围（1-3℃）内，雪融化面积随着温度升高而线性增加。气温每升高2℃，融雪季节的积雪融化面积就会增加5.1%。 （较少的）
A procedure for evaluating depletion of snow covered area (SCA) using mean air temperature has been outlined and tested. Because depletion of snow is a cumulative effect of climatic conditions in and around snow cover area, the cumulative mean temperature (CTM) at a nearby station should represent depletion of SCA. The study was carried out for Satluj basin (22,305 km(2)) located in the western Himalayan region. Melting starts around beginning of March, therefore, reference date for computing CTM was considered March 1. Data of three ablation seasons (1987-1989) were used to establish relationship between SCA and CTM. It was found that depletion of SCA is exponentially correlated with CTM (R-2 > 0.98). An exponential reduction of SCA can be explained on the basis of snow distribution in the mountainous basins. This method has a potential for estimating missing data and extending time series on daily, weekly or Monthly basis. Once the depletion trend is established in, the basin in the first part of melt season, SCA can be simulated with good accuracy using CTM data for the rest period of melt season. Such applications can reduce the number of satellite images required for obtaining SCA information. A forecast of SCA can also be made using forecasted air temperatures. Impact of climate change on depletion of SCA over the melt period indicated that for the considered range of temperature increase (1-3degreesC), melting area of snow increased linearly with increase in temperature. An increase in temperature by 2degreesC enhanced the melting area of snow over the melt season by 5.1%. (Less)