HR: 0800h
AN: A41A-0015    [Abstracts]
TI: Preliminary Study On Surface Radiation Characteristic Over Semi-Arid Region Of Loess Plateau
AU: Bi, J
EM: bijr997@yahoo.com
AU: * Huang, J
EM: hjp@lzu.edu.cn
AU: Liu, Y
EM: liuyzh@lzu.edu.cn
AU: Shi, J
EM: shijs06@lzu.cn
AU: Huang, Z
EM: huangzhw03@lzu.cn
AU: Zhang, W
EM: wzhang@lzu.edu.cn
AB: By using the land-surface radiative data observed over Semi-Arid Climate and Environment Observatory of Lanzhou University during April 12, 2006 to June 30, 2007, the variational rule of land-surface radiation over Semi- Arid region of Loess Plateau is preliminarily analyzed, and the monthly averages of surface radiation balance, surface albedo and influence mechanism are completely studied. The result shows that the annual averaged radiant intensity is comparatively strong in this region. In the influence of land-surface conditions and synoptic conditions, the monthly averages of surface radiation take on irregular or territorial characteristic. Atmosphere and land-surface need about two months to response to the heat of radiation in the variation of annually mean radiation, and need about two hours and one hour to response to the heat of radiation in diurnal variation, respectively. The all-year variational range of atmosphere and land-surface radiations in semi-arid region are 162.6 and 180.4180.4, respectively, which are much smaller than that in arid of deserted region (about 100%). In other words, it means that the annual averaged cloud in semi-arid region is much more than in arid region, and atmosphere and soil intensively mitigate the variability of surface radiation in semi-arid region. The Annual average of surface albedo in semi-arid region of Loess Plateau is 0.2432, which is smaller than that in arid region (about 0.259), and greater than that in Dingxi Site(about 0.20). And the big values of surface albedo consist with the appearance of droughty weather and snowfall synoptic, whereas the small values of surface albedo correspond to the emergence of cloudy sky and rainfall synoptic.
UR: http://climate.lzu.edu.cn/~jhuang/
DE: 0360 Radiation: transmission and scattering
DE: 0530 Data presentation and visualization
DE: 3359 Radiative processes
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting