Estimation of components of energy balance on drifting ice over Arctic Ocean

Estimation and simulation were carried out for the components of ice-surfac e energy balance and turbulent exchange parameters using the flux-profile m ethod and the simple biosphere model version 2 (SiB2, hereinafter) respecti vely based on the measured results for the atmosphere in the near-ice-surfa ce layer, which were observed by the First Arctic Scientific Expedition of China in August, 1999 at a joint ice-research station (75 degrees 02 'N, 16 0 degrees 51 'W) on the drifting ice of Arctic Ocean. Evidence suggests tha t during the melting period of drifting ice the sum of the ice-released sen sible heat and effective melting-consumed heat is greater than the net ice- absorbed radiation on the surface, with the excess heat coming via heat con duction from the deep layers of the ice mass. The simulated net radiation i s systematically 18% greater than the measured results, while the simulated sensible heat flux is systematically 3% lower than the measured ones; and the simulated ice-surface heat flux differs noticeably from its calculation . Hence, we see that although the measured sequences are short, the simulat ions of net radiation and sensible heat fluxes by the SiB2 model are compar atively good, the simulation of other forms of fluxes still needs to be imp roved.