东北地区积雪反照率特性

The characteristics of snow cover albedo in Northeast China

利用2017年12月至2018年3月在东北地区获取的82个观测点的积雪反照率数据,从积雪反照率的时序差异、空间特点、影响因素三个方面开展了积雪反照率时空特点研究。结果表明:(1)在时间上,随着积雪积累时间的增加,积雪反照率逐渐降低,最大下降速率为0.003 d-1。(2)在空间上,积雪反照率在东西方向差异显著,大兴安岭东西两侧地区的积雪反照率均值分别为0.679和0.751;在同一地区内,积雪反照率在雪表层含水量、雪粒径等因素影响下也存在一定差异,大兴安岭西侧地区的积雪反照率北低南高,大兴安岭东侧地区的积雪反照率北高南低。(3)耕地上的农作物留茬对积雪反照率影响较大,短时间内天气变化对积雪反照率影响较小。

Based on the snow albedo data from 82 observation points from December 2017 to March 2018 in Northeast China,the spatial and temporal characteristics of snow albedo were analyzed from time series difference,spatial characteristics and their impact factors in this paper.The results showed that:(1)temporally,the snow albedo gradually decreased with time with the maximum decline rate of 0.003 d-1.(2)spatially,the snow albedo was significantly different between the west and the east,with an average snow albedo of 0.751 to the west of the Greater Khingan Range,and of 0.679 to the east of the Greater Khingan Range;at the same area,the snow albedo had some differences due to the influences of water content and snow grain;snow albedo to the west of the Greater Khingan Range exhibited low in the north and high in the south,the albedo to the east of the Greater Khingan Range exhibed high in the north and low in the south.(3)the stubble of cropland had a greater effect on snow albedo;the impact of weather change had less effect on snow albedo in a short period of time.