The Research Of Summertime Energy And Mass Balance Of Laohugou No.12Glacier

Based on routine meteorological data at4550m a.s.l and5040m a.s.l of Laohugou No.12glacier of Qilian mountain, we used a physical based distributed surface energy-mass balance model have calculated the budget of energy and mass of the glacier during1June to30September2012. The model output mass balance and runoff, the main results of the paper are shown as follows:The Laohugou No.12glacier was characterized by the climate with low air temperature and great annual range, precipitation occurred mainly from May to September. The air temperature gradient and precipitation gradient is-0.42℃/100m and8.7%/100m respectively from the two AWS (Auto weather station) stations at4550m a.s.l and5040m a.s.l. And the area has a big wind speed, the main direction of the wind is WS, SSW and West at4200m,4550m and5040m a.s.l respectively.The incoming shortwave radiation had little variation along the elevation, was mainly effected by massif shield and terrain, and the closer to west massif the less of incoming shortwave radiation. The simulated averaged mass balance was-506mm w.e during the period. The glacier had a intense ablation, accumulation area was small, the equilibrium line was high (during June to September) at around5100m a.s.l.During1June to30September2012, the runoff volume stimulated was16.37x106m3,39%among it came from snow and firn melting, and61%came from ice melting. Net radiation was the primary source of the surface energy balance (84%), followed by sensible heat flux (16%). In the output of surface energy, melting energy and latent heat flux was62%and38%respectively.