西北半干旱区感、潜热通量特征及近50年来的变化趋势  

Characteristics of Sensible and Latent Heat Fluxes in Semi-Arid Region of Northwest China and Change Trend in Recent 50 Years

作　　者：王澄海[1] 王蕾迪[1] 

机构地区：[1]半干旱气候变化教育部重点实验室/兰州大学大气科学学院,甘肃兰州730000

出　　处：《高原气象》2010年第4期849-854,共6页Plateau Meteorology

基　　金：中国气象局公益性行业专项(201006023);国家自然科学基金项目(40975060)共同资助

摘　　要：在对比分析2007年兰州大学SACOL测站观测值和NCEP模式产品的感、潜热等变化特征的基础上,用观测资料和NCEP感、潜热通量资料的误差对1961—2008年的NCEP感、潜热通量资料进行了订正。分析了近50年西北半干旱区感、潜热的年际变化趋势。结果表明:平均而言,在半干旱区,4月感热最大,7月潜热最大;在过去的近50年间,年平均潜热通量大于感热通量。近50年来,潜热通量有减小的趋势,感热通量有增加的趋势。Using the observed data from Semi-Arid Climate Observatory and Laboratory of Lanzhou University（SACOL）（35.57°N,104.08°E,1965.8 m） in 2007,the characteristics of sensible and latent fluxes （SH and LH） in semi-arid region of Northwest China are analyzed.An error-correction between observations and NCEP datum is made during the 1961／_2008.Interannual changes and trends of SH and LH are analyzed in recent 50 years.The results show that： On the average,the maximum value of SH appears in April,and maximum value LH in July,while both of them are much low in January and December,LH is stronger than SH from May to November.At the same time,comparing with the observed data,SH and LH from NCEP have a systematic deviation that larger than the observed values,what′s more,annual error of LH is larger than that of SH.Annual LH is stronger than SH in duration of recent 50 years.In recent 50 years,there is a descending trend in LH,and a ascending trend in SH.On the one hand,the results might show that the surface fluxes are undergoing a process of mutual adjustment during the recent 50 years to the present,on other hand,it also indirectly reflects the surface structure is undergoing significant restructuring and change.

关 键 词：西北半干旱区 感热通量 潜热通量 

分 类 号：P425.23[天文地球—大气科学及气象学]