科研之友
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摘要
observations of the influence of a cold spell phenomena on meteorological variables and on energy and co2 fluxes were made in a forest site near ji-paran芍, rondonia, during june 2001. friagem caused a diminution of 35% at air temperature. a reduction of 75 w.m-2 from normal days (200 w.m-2) to cold days (125 w.m-2) in the mean incoming solar radiation was also observed. during the cold spell days, both sensible heat (h) and latent heat fluxes (le) showed a decrease in their mean daily value, showing a difference from normal days of 8 e 34%, respectively. the co2 concentration remained constant, without increase during the night, due to the windy condition of cold days. during normal days the mean diurnal co2 flux (-2,44 mmol m-2 s-1) was lesser than that one at phenomena days (-5,78 mmol m-2 s-1), while the mean nocturnal fluxes were +1,77mmol m-2 s-1 e +2,83mmol m-2 s-1 during normal and cold days, respectively.
