摘要
气候变化背景下地表反照率的变化能够深刻影响整个陆-气系统的能量收支平衡,引起区域以至全球的生态环境发生变化。基于2001-2013年16 d合成的MODIS/MCD43A3等数据,结合均值分析、斜率分析以及相关分析等研究方法,对气候变化背景下天山区域地表反照率时空变化特征进行分析。在空间分布上,近13 a来天山区域年均地表反照率达到0.217,伊犁河谷地区及天山北麓地表反照率较高,山区地表反照率较低,空间上呈交叉分布的特点;在时间分布上,研究区年均地表反照率缓慢增加,季节性差异明显,地表反照率秋季最高、春季最低,冬、春两季地表反照率波动强于其他季节;近13 a来地表反照率与气候因子之间存在较为明显的响应关系。年均地表反照率随着4、12月份气温的增加不断减小,随着7、8月份降水的减少而明显增加,与同期气温、滞后1月降水之间存在显著相关。
Albedo is the fraction of solar energy （shortwave radiation） reflected from the Earth surface into space, it can change the energy balance of the land surface, causing regional ecological changes. The study of sur- face albedo is a systematic work, and it is the important basis for the ecological planning and protection. The anal- ysis combined mean, slope and correlation can effectively analyze spatial distribution of surface albedo variations in different times. Based on the MODIS/MCD43A3 and meteorological data from 2001 to 2013, the paper have been researched the features of surface albedo of Tianshan Mountains Area by statistical analysis. The results indi- cate as follows： firstly, as a whole, the average surface albedo was 0.217, and there was an obviously difference in the temporal and spatial distribution. It illustrated a cross distribution characteristics overall, ni River valley and the oasis region were higher while the central area was slightly lower. The surface albedo of Tianshan Moun- tains showed an annual growth rate of about 0.03 or more; Secondly, there was an increasing trend in years, with an annual growth rate of about 0.0014. Seasonal differences are obvious during the 13 years, the surface albedo of autumn was the highest and spring was the lowest. In winter and in spring, the fluctuations of surface albedo were stronger than other seasons, the coefficient of variation was 12.8% and 12.6%, respectively; During 13 years, the response between the surface albedo and climate factors were clear. In April and in December, with the increase of temperature, the surface albedo gradually reduced, while the surface albedo increased significantly with the decrease of precipitation in July and in August. At the same time, there was a significant correlation be- tween the temperature and albedo over the same period, while one month lag phenomenon existed between pre- cipitation and albedo.
出处
《干旱区地理》
CSCD
北大核心
2015年第2期351-358,共8页
Arid Land Geography
基金
国家科技支撑计划(2012BAC23B01
2012BAD16B0305)
中国沙漠气象科学研究基金(sqj2012006)
作者简介
管延龙（1988-），男，硕士研究生，主要从事环境生态研究．Email：guanyanlong2012@163.com
通讯作者：王让会，博导，陕西人，教授，主要从事景观生态、全球变化的区域响应等领域的研究，E-mail：rhwang@nuist．edu.cn
