Using Satellite Data To Study The Impact Of Cloud On The Surface Net Radiation

First, under the given boundary condition and reasonable simplified condition, this paper develops radiation transmitting equations in atmosphere applied in infrared waveband and visual light waveband from common equation of radiation transmitting.Then, the formula between observation of satellite and net surface radiation is established according to the developed equations, from which it is found that net surface radiation is relative to sun zenith, land surface and cloud albedo, etc. At last, by using data of satellite visual light (VIS), infrared 1(IR1), infrared 2(IR2) and water vapor (IR3) channel, sun zenith and net surface radiation, a regression formula is built. The results show good performance between VIS, IRl, sun zenith and net surface radiation. The correlation coefficient is up to 0.8259.In terms of cloud condition, the results are improved when data of IRl minus IR3 are used, which give a new method to study cloud effect on net surface radiation.In this paper, an new index named CRCI, Cloud Radiation Control Index, is adopted. CRC1 can describe the relationship among cloud reflecting radiation, cloud emitting, earth-atmosphere radiation and surface radiation balance.Also, the theory and methods used in this paper can be applied to FY-2 besides GMS-5.