青藏高原西部地表热通量输送的低频特征  

Low Frequency Oscillation Characteristics of the Surface Heat Fluxes in Western Tibetan Plateau

作　　者：张鹏飞[1] 李国平[1] 尹建昌 

机构地区：[1]成都信息工程学院大气科学学院,四川成都610225 [2]四川省内江市气象局,四川内江641000

出　　处：《高原气象》2009年第3期556-563,共8页Plateau Meteorology

基　　金：国家重点基础研究发展计划项目(973计划,2004CB418300);国家自然科学基金项目(40875023)共同资助

摘　　要：以1997年9月—1998年10月青藏高原西部改则地区自动气象站（AWS）近地层连续观测的梯度资料为基础,计算了高原西部地面感热通量、蒸发潜热通量及地面热源强度,应用Marr小波变换重点分析了地表热通量输送以及与此相关的降水量、土壤湿度和土壤热通量的周期振荡特征。结果表明：地面感热具有明显的30~60天低频振荡,并且在夏季存在准8天的中期振荡;蒸发潜热和降水量以准双周振荡为主。土壤热通量以30~50天低频振荡为主,夏季还存在准8天的中期振荡;土壤湿度在冬季呈现明显的30~50天低频振荡,夏季则为20~30天的低频振荡。Based on the continuous observational gradient data of the surface layer obtained from automatic weather station （AWS） in Gaize of the western Tibetan Plateau from September 1997 to October 1998, the surface sensible heat flux, the latent heat flux of evaporation and the heat source intensity are calculated. The stress of this paper focuses on analyzing the periodic oscillation characteristic of the surface heat fluxes, precipitation, soil moisture and soil heat flux by Marr wavelet transform. The result shows that the surface sensible heat flux have taken on the feature of 30-60 d low frequency oscillations obvious- ly, and quasi-8 d medium frequency oscillations exist in summer; the latent heat flux of evaporation and the precipitation is based on the principle of hi-week oscillation. The remarkable feature of the soil heat flux is 30-50 d low frequency oscillations, and quasi-8 d medium frequency oscillations exist in summer. The soil moisture shows 30-50 d low frequency oscillations in winter and 20-30 d low frequency oscillations in summer.

关 键 词：青藏高原西部 地表热通量 降水量 土壤湿度 低频振荡 

分 类 号：P422.4[天文地球—大气科学及气象学]