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中国沙漠 ›› 2011, Vol. 31 ›› Issue (2): 525-528.

• 天气与气候 • 上一篇    下一篇

LAS在西北半干旱地区的观测分析

黄 山1, 张文煜1*, 左洪超1, 刘欣1, 史永义2   

  1. 1.兰州大学 大气科学学院 半干旱气候变化教育部重点实验室/甘肃省干旱气候变化与减灾重点实验室, 甘肃 兰州 730000; 2.山西省阳泉市气象局, 山西 阳泉 045100
  • 收稿日期:2010-06-29 修回日期:2010-10-14 出版日期:2011-03-20 发布日期:2011-03-20

Large Aperture Scintillometers(LAS) Observation in Semi-arid Regions of Northwestern China

HUANG Shan, ZHANG Wen-yu, ZUO Hong-chao, LIU Xin1, SHI Yong-yi2   

  1. 1.Ministry of Education Key Laboratory of Semi-Arid Climatic Changes, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China; 2.Yangquan Meteorological Bureau of Shanxi Province, Shanxi Yangquan 045100, China
  • Received:2010-06-29 Revised:2010-10-14 Online:2011-03-20 Published:2011-03-20

摘要: 利用兰州大学半干旱气候与环境观测站2007年夏冬两季LAS观测数据,结合观测站气温、气压及同期的涡动相关仪30 min时间间隔的观测数据,计算分析了西北半干旱地区显热通量的变化特征,并将LAS所测结果与涡动相关仪的测量结果进行了对比分析。结果表明,在西北半干旱地区,夏季的显热通量值整体大于冬季,冬季显热通量的日变化峰值较夏季有明显的滞后性;在类似的天气状况下,夏季测得显热通量的波动要大于冬季;天气状况对LAS的观测结果有着很大的影响,在同一季节晴天显热通量较大,阴天较小;LAS测得显热通量H的值较涡动相关所得H值略微偏大,但LAS与涡动相关仪测得的显热通量有很好的符合性,夏季相关系数为0.95,冬季相关系数为0.98。

关键词: 显热通量, LAS, 涡动相关仪, 半干旱地

Abstract: In this paper, sensible heat flux in semi-arid region of northwestern China were calculated and analyzed by use of the observation data of Large Aperture Scintillometers (LAS) recorded per 30 minutes, the temperature, pressure data, and the observation data by Eddy Covariance System at Lanzhou University Semi-arid Climate and Environment Observatory during summer and winter of 2007. The values of the sensible heat flux in summer were bigger than that in winter, and there was a lag of peak value on diurnal variation curve in winter; at the similar weather conditions, the fluctuation of sensible flux in summer was bigger than that in winter. Weather condition had a great impact on the observations of LAS, the values of the sensible heat flux in sunny days were higher than that in cloudy days at the same season. Compared with sensible heat flux observed by Eddy Covariance System, the sensible heat flux measured by LAS was a little larger, but the values by the two methods showed a good agreement, and the correlation coefficient in summer was 0.95, and it was 0.98 in winter.

Key words: sensible heat flux, LAS, Eddy Covariance System, semi-arid region of China

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