陇中黄土高原陆面辐射分量年际变化及其对气候波动的响应

The interannual variation of land surface radiation components over Loess Plateau and its response to climate fluctuation

本文利用兰州大学半干旱气候与环境观测站(SACOL站)2006—2012年陆面过程观测资料以及榆中站气象资料,分析了陆面各辐射收支分量对于气候波动的响应,并且研究了地表反照率年际波动变化,讨论了各陆面过程参数对于黄土高原气候背景年际波动的反馈。并且根据黄土高原降水类型将全年分为冬夏半年讨论,以得到更为显著的年际变化特征和相关关系。结果显示,2006—2012年气温降水的趋势与近年来黄土高原暖干化总趋势相吻合。地表浅层土壤湿度和温度都与气温、降水呈现很好的响应。气候因素的综合影响是地表反照率变化波动的原因。通过冬夏半年资料区分探究得到,长波辐射分量与气候要素的相关较短波辐射分量与气候要素的相关性更强。但总体而言,陆面过程对于该地区气候背景波动的响应机制是较为复杂的。

By using the land surface observations data of semi-arid climate and environmental obser- vation stations in Lanzhou University （SACOL station） during 2006-2012 and meteorological data of Yuzhong station, the response of land surface radiation budget component to climate fluctuations was ana- lyzed, the interannual variability of surface albedo was studied and the feedback of various parameters of land surface processes for the interannual fluctuations of Loess Plateau climatic background years was dis- cussed. The precipitation type is used to divide the whole year into winter and summer half years in order to get more significant interannual variability and correlation. Results show that the temperature and pre- cipitation trends in recent years match the overall total Loess Plateau warming and drying trend. Soil mois- ture and temperature of shallow surface show a good response to air temperature and precipitation. The combined effects of climatic factors are the reason of the change of land surface albedo. Based on the study on the winter and summer data, it was found that the correlation coefficient of long-wave radiation components and climatic factors are more relevant than correlation coefficient of short-wave radiation com- ponents and climatic factors.