The annual variation of the surface albedo of semi-arid grassland, and its variation characteristics under typical weather conditions over the Loess Plateau of middle part Gansu were analyzed by using the observation data of Semi-Arid Climate Observatory and Laboratory of Lanzhou University (SACOL) in the whole year of 2010. The results show that: The surface albedo of semi-arid grassland over the Loess Plateau of middle part Gansu is higher in winter half year than that in summer half year, and the annual average surface albedo is 0.21, which is higher than that in oasis regions, but lower than that in the semi-arid farmlands. In addition, weather conditions obviously have impacts on the diurnal variation of the surface albedo. In sunny days, the surface albedo is higher in morning and evening but relatively lower at noon, while it has little variation in cloudy days; The surface albedo firstly decreases and then increases after rainfall, while firstly increases and then decreases after snowfall. Moreover, the surface albedo is a little higher in dust weather than that in sunny days. Surface albedo is significantly asymmetric in sunny days, namely the surface albedo is higher in early morning than that in late afternoon at the same solar elevation. The difference has good agreement with the variation of shallow soil moisture. The results of this study have a certain scientific value in determining the surface albedo, verifying and improving models′ ability to simulate weather and climate.
[1]Wang S. Dynamics of surface albedo of a boreal forest and its simulation[J]. Ecological Modeling, 2005, 183(4): 477-494.
[2]Tsvetsinskaya E A, Schaaf C B, Gao F, et al. Relating MODIS-derived surface albedo to soils and rock types over Northern Africa and the Arabian peninsula[J]. Geophys Res Lett, 2002, 29(67): 1-4.
[3]Wang S, Grant R F, Verseghy D L, et al. Modelling plant carbon and nitrogen dynamics of a boreal aspen forest in CLASS the Canadian Land Surface Scheme[J]. Ecological Modeling, 2001, 142(1-2): 135-154.
[4]Yin X. The albedo of vegetated land surfaces: systems analysis and mathematical modeling[J]. Theor Appl Climatol, 1998, 60(1-4): 121-140.
[5]张果, 周广胜. 稀疏植被地表反照率日变化对通量模拟效果的影响分析——以内蒙古荒漠草原感热和潜热通量为例 [J]. 高原气象, 2012, 31(4): 942-951.
[6]范丽君, 董文杰. 西北干旱区地表辐射特性的初步研究[J]. 高原气象, 2002, 21(3): 309-314.
[7]王介民, 高峰. 关于地表反照率遥感反演的几个问题[J]. 遥感技术与应用, 2004, 19(5): 295-300.
[8]李伟平, 吴国雄, 刘辉. 地表反照率的改变影响夏季北非副热带高压的数值模拟[J]. 气象学报, 2000, 58(1): 26-39.
[9]Lean J, Rowntree P R. A GCM simulation of the impact of the Amazonia deforestation on climate using an improved canopy representation[J]. Quart J Roy Meteor Soc, 1993, 119(511): 509-530.
[10]左大康, 周允华, 项月琴, 等. 地球表层辐射研究[M]. 北京: 科学出版社, 1991: 37-39.
[11]刘辉志, 涂钢, 董文杰. 半干旱区不同下垫面地表反照率变化特征[J]. 科学通报, 2008, 53 (10): 1220-1227.
[12]孙俊, 胡泽勇, 荀学义, 等. 黑河中上游不同下垫面反照率特征及其影响因子分析[J]. 高原气象, 2011, 30(3): 607-613.
[13]冯超, 古松, 赵亮, 等. 青藏高原三江源区退化草地生态系统的地表反照率特征[J]. 高原气象, 2010, 29(1): 70-77.
[14]张果, 周广胜, 阳伏林. 内蒙古荒漠草原地表反照率变化特征[J]. 生态学报, 2010, 30(24): 6943- 6951.
[15]刘永强, 何清, 张宏升, 等. 塔克拉玛干沙漠腹地地气相互作用参数研究[J]. 高原气象, 2011, 30(5): 1294-1299.
[16]张文煜, 张宇, 陆晓静, 等. 黄土高原半干旱区非均一下垫面粗糙度分析[J]. 高原气象, 2009, 28(4): 763-768.
[17]Huang J P. An overview of the semi arid climate and environment research observatory over the loess plateau[J]. Adv Atmos Sci, 2008, 25 (6): 906-921.
[18]王鸽. 1982-2000年中国区域地表反照率时空分布特征[J]. 高原气象, 2010, 29(1): 146-151.
[19]季国良, 邹基玲. 干旱地区绿洲和沙漠辐射收支的季节变化[J]. 高原气象, 1994, 13(3): 323-329.
[20]余予, 李扬云, 童应祥, 等. 寿县地区小麦和水稻田地表反照率观测分析[J]. 气候与环境研究, 2009, 14(6): 639-645.
[21]江灏. HEIFE绿洲区太阳总辐射和地表反射率的分光谱特征[J]. 高原气象, 1993, 12(2): 156- 161.
[22]胡列群, 李江风. 塔克拉玛干沙漠及周围地区地表反射率[J]. 干旱区研究, 1993, 10(1): 33-38.
[23]李英年, 赵新全, 曹广民, 等. 海北高寒草甸地区太阳总辐射、 植被反射辐射的有关特征[J]. 草地学报, 2002, 10(1): 33- 39.
[24]沈钟平, 张华. 影响地面太阳辐射及其谱分布的因子分析[J]. 太阳能学报, 2009, 30(10): 1209-1215.
[25]张强, 王胜, 卫国安. 西北地区戈壁局地陆面物理参数的研究[J]. 地球物理学报, 2003, 46(5): 616 -623.
[26]魏文寿, 秦大河, 刘明哲. 中国西北地区季节性积雪的性质与结构[J]. 干旱区地理, 2001, 24(4): 310-313.
[27]蒋熹. 冰雪反照率研究进展[J]. 冰川冻土, 2006, 28(5): 728-738.
[28]成天涛. 中国西北大气沙尘的辐射强迫[J]. 高原气象, 2002, 21(5): 473-478.
[29]邹基玲, 季国良. 藏北高原太阳总辐射和地表反射率的分光特征[J]. 太阳能学报, 1996, 17(2): 113-117.
[30]文莉娟, 吕世华, 陈世强, 等. 干旱区绿洲地表反照率不对称观测研究[J]. 太阳能学报, 2009, 30(7): 953-956.
[31]陈向红. 地面反射率与若干气象因子关系的初步分析[J]. 成都气象学院学报, 1999, 14(3): 233-238.
[32]Song J. Diurnal asymmetry in surface albedo[J]. Agricultural and Forest Meteorology, 1998, 92: 181-189.
[33]张强, 卫国安, 黄荣辉. 绿洲对其临近荒漠大气水分循环的影响——敦煌实验数据分析[J]. 自然科学进展, 2002, 12(2): 195-200.
[34]Guan X, Huang J, Guo N, et al. Variability of soil moisture and its relationship with surface albedo and soil thermal parameters over the Loess Plateau[J]. Adv Atmos Sci, 2009, 26(4): 692-700.
[35]陈世强, 吕世华, 奥银焕, 等. 夏季不同土壤湿度和天气背景条件下绿洲土壤温湿特征的个例分析[J]. 中国沙漠, 2007, 27(4): 621-626.
[36]余予, 陈洪滨, 夏祥鳌, 等. 青藏高原纳木错站地表反照率观测与MODIS资料的对比分析[J]. 高原气象, 2010, 29(2): 260-267.
