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不同下垫面大孔径闪烁仪观测数据处理与分析

卢俐 刘绍民 徐自为 王介民 李小文

卢俐, 刘绍民, 徐自为, 等. 不同下垫面大孔径闪烁仪观测数据处理与分析. 应用气象学报, 2009, 20(2): 171-178..
引用本文: 卢俐, 刘绍民, 徐自为, 等. 不同下垫面大孔径闪烁仪观测数据处理与分析. 应用气象学报, 2009, 20(2): 171-178.
Lu Li, Liu Shaomin, Xu Ziwei, et al. Results from measurements of large aperture scintillometer over different surfaces. J Appl Meteor Sci, 2009, 20(2): 171-178.
Citation: Lu Li, Liu Shaomin, Xu Ziwei, et al. Results from measurements of large aperture scintillometer over different surfaces. J Appl Meteor Sci, 2009, 20(2): 171-178.

不同下垫面大孔径闪烁仪观测数据处理与分析

资助项目: 

国家高技术研究发展计划课题 2007AA12Z175

公益性行业 (气象) 科研专项 GYHY200706046

国家重点基础研究发展规划项目 2007CB714401

国家自然科学基金项目 40671128

Results from Measurements of Large Aperture Scintillometer over Different Surfaces

  • 摘要: 大孔径闪烁仪是近年兴起的测量大尺度(500 m~10 km)地表通量的仪器。北京师范大学等单位分别于2002年、2004年在北京昌平小汤山开展了大孔径闪烁仪短期观测实验, 2006年6月又在北京密云建立了长期观测站。利用这些数据, 对大孔径闪烁仪观测数据进行处理与分析, 结果表明:闪烁仪光径高度和风速是影响观测显热通量的关键因子。当地表粗糙元的高度变化相对于光径高度不可忽略时, 零平面位移需要精确确定。波文比在湿润地表需要准确确定, 而气温、气压和动力学粗糙度则为不敏感因子。计算中所需的大气稳定度可用理查孙数判断, 也可借助日出日落时间或净辐射观测值确定。稳定条件下的普适函数目前无统一表达式, 可采用仪器说明书推荐的函数。通过几个站点闪烁仪观测显热通量与涡动相关仪测量值的比较表明:大孔径闪烁仪在均匀和非均匀地表都能得到合理的显热通量观测值。
  • 图  1  利用HEC(HLAS1)、梯度理查孙数Ri(HLAS2)、日出日落时间 (HLAS3) 和净辐射 (HLAS4) 确定HLAS符号得到的HLASHEC以及净辐射Rn的比较

    Fig. 1  Daily variation of HLAS, HEC and Rn with the sign of HLAS determined by the measured HEC(HLAS1), Richardson number (HLAS2), sunrise-sunset time (HLAS3) and net radiation (HLAS4)

    图  2  均匀、非均匀地表上HLAS, HEC与净辐射Rn在白天的变化

    Fig. 2  Daily variation of HLAS, HEC and Rn over homogeneous, heterogeneous surfaces

    图  3  2007年密云站HLASHEC的月变化

    Fig. 3  Monthly variation of HLAS and HEC in 2007 of Miyun

    表  1  波文比不同取值条件下得到的显热通量HLAS与参考值的比较

    Table  1  Statistics of HLAS flux estimated with different β against the reference value

    表  2  风速u和空气温度T不同取值条件下得到的显热通量HLAS与参考值的比较

    Table  2  Statistics of HLAS estimated under different conditions of u and T against the reference value

    表  3  d, z0mzLAS不同取值条件下得到的显热通量HLAS与参考值的比较

    Table  3  Statistics of HLAS estimated under different conditions of d, z0m and zLAS against the reference value

    表  4  稳定条件下不同普适函数与fT_Andreas函数得到的HLAS值之间的比较

    Table  4  Statistics of HLAS estimated with different fT_functions against the one with fT_Andreas under stable condition

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出版历程
  • 收稿日期:  2008-06-03
  • 修回日期:  2009-02-05
  • 刊出日期:  2009-04-30

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