Abstract:

Based on Koldewey Station′s 1993—2003 hourly observational data,this paper conducts a statistical analysis on the radiation characteristics for an arctic tundra region(Ny-lesund island) where our first arctic expedition station(Huanghe Station) is located.Affected by cloudy sky,Ny-lesund′s sunshine percent was only 32.2% even during deep summer.As a result of ice and snow′s melting effect during warm season,surface reflecting ratio was quickly decreasing and surface absorbing radiation and effective radiation were rapidly increasing.The total net radiation was positive during the whole year.Surface absorbing radiation mainly focused in warm season and was absent during cold season.Radiation factors didn′t show clear changing trends though temperature was clear uptrend at Ny-lesund.NCEP/NCAR reanalysis data of the grid closest to Ny-lesund aren′t accurate in keeping consistent changes with the data obtained at Ny-lesund about surface radiation factors.