【摘要】 通过GAME -Tibet野外工作前期所得到的土壤温度资料 ,初步分析了藏北高原不同地点不同深度土壤温度随时间的变化特征 ,并探讨了这种特征形成的原因。认为这可能与降雪、反照率、长波辐射、凝结潜热等的反馈过程及土壤湿度有关。由于土壤湿度等的影响 ,较潮湿的地方下层土壤从开始冻结到完全冻结需要一个较长的时间过程。更多还原

【Abstract】 InordertoquantitativelyunderstandtheroleofTibetanPlateauinAsianmonsoon system ,theGAME_TibetProjectwascarriedoutjointlybyChineseandJapanesescientists. Theexaminationsofthesoiltemperatureindifferentdepthondifferentsitesarecommonin someextent,therearealsosomedifferences.Variationsofsoiltemperatureindifferentdepth areconsistentwiththatofsolarradiation .Thephaseofsoiltemperaturevariationindeeper layerislaggedbehindthatoftheshallowerlayer.However,thedeeperthelayer,thesmaller theamplitudeofvariation .Meamwhile,thesignofthevertical gradientofthesoil temperaturecanchangeseveraltimes.Thisshowsthattheverticalenergyflgradientcan changeseveraltimesinoneyear.Itisassociatedwiththeenergybudgetonthesurface.The coolingofthesoilisprettyslowly .However,thewarmingofthesoilisfastinspringand summer.Suchphenomenamaybeassociatedwiththefeebdackprocessesofsnowcover, albedo ,longwaveradiationandtheheatofcondensation .Duetothesoilmoisture,freezing processtakestimefromfreezingtobefrozen .Thewetterthesoil,thelongerthetime.更多还原