GEOGRAPHICAL RESEARCH ›› 2007, Vol. 26 ›› Issue (6): 1127-1136.doi: 10.11821/yj2007060007

• Environment and Ecology • Previous Articles     Next Articles

Study on regional distribution of land surface parameters and components of surface radiation balanceover South Ningxia

GUO Jian-mao1, YU Qiang2, WANG Lian-xi3, LU Wei-song1   

  1. 1. Department of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044,China;
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    3. Key Laboratory of Meteorological Disaster Prevention andMitigation of Ningxia,Yinchuan 750002,China
  • Received:2006-09-24 Revised:2007-05-22 Online:2007-11-25 Published:2007-11-25
  • Supported by:

    国家自然科学基金(N40575057)、中国气象局成都高原气象研究所开放实验室基金(LPM2005005)和科技部社会公益项目(2001DIB10089)共同资助

Abstract:

Dealing with regional land surface parameters and radiation balance components is a very important and difficult task. Studying on land surface parameters and components of surface radiation balance over inhomogeneous landscape, the utilization of satellite remote sensing is indispensable. In this study, a parameterization method based on Landsat-7 ETM+ data and 22 weather stations data is described for deriving the regional distributions of land surface parameters (NDVI,surface reflectance, surface temperature) and components of surface radiation balance (surface absorbed shortwave radiation, surface upward longwave radiation,downward atmospheric radiation, net radiation) over the southern Ningxia region.Distribution map and histograms of the parameters and components are given. Furthermore, the southern Ningxia region is classified into five surface types, regional distributions of land surface parameters and components of surface radiation balance are discussed according to each type. The results indicate: (1) All the regional distributions are characteristic in their terrain nature and the regional distributions are obvious and regular. The maps of mountains and rivers are very clear with dense vegetations growing on the mountains and by the rivers. It is seen that the derived regional distributions of land surface parameters and components of surface radiation balance for the whole mesoscale area are well in accord with the land surface status. (2) The maximum NDVI is on the Liupan mountains (with a forest) followed by the Yueliang mountain and rivers and other irrigated areas (with grass or crops),and the low NDVI value area over water bodies and nudation.(3)The regional distributions of surface reflectance and surface temperature are basically in-phase opposition with the corresponding regional distributions of NDVI.(4)The surface absorbed shortwave radiation is high over the Liupan mountain, the Yueliang mountain and by the rivers, and the nudation is low.On clear day, the surface absorbed shortwave radiation is mainly determined by surface reflectance. The regional distribution of net radiation is similar to the surface absorbed shortwave distribution.

Key words: land surface parameters, components of surface radiation balance, regional distribution, remote sensing, southern Ningxia