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冰川冻土 ›› 2017, Vol. 39 ›› Issue (5): 1057-1064.doi: 10.7522/j.issn.1000-0240.2017.0117

• 寒区科学与技术 • 上一篇    下一篇

陇中黄土高原LAS在非均匀下垫面的观测优势及其在区域陆面模式验证中的初步应用

郝小翠1, 张强1, 杨泽粟2, 黄菁3   

  1. 1. 甘肃省气象局 西北区域气候中心, 甘肃 兰州 730020;
    2. 成都信息工程大学 大气科学学院, 四川 成都 610225;
    3. 永嘉县气象局, 浙江 永嘉 325100
  • 收稿日期:2016-12-06 修回日期:2017-07-06 出版日期:2017-10-25 发布日期:2018-01-27
  • 作者简介:郝小翠(1987-),女,江苏如皋人,工程师,2013年在兰州大学获硕士学位,从事陆面过程和大气边界层的研究.E-mail:hao_xiaocui@126.com.
  • 基金资助:
    国家自然科学基金项目(41630426);高原大气与环境四川省重点实验室开放课题(PAEKL-2017-Y5);国家重点基础研究发展计划项目(2013CB430206)资助

Superiority of LAS in observation on heterogeneous surface and its preliminary application for the validation of land surface models in Longzhong Loess Plateau

HAO Xiaocui1, ZHANG Qiang1, YANG Zesu2, HUANG Jing3   

  1. 1. Northwest Regional Climate Center, Gansu Meteorological Bureau, Lanzhou 730020, China;
    2. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;
    3. Yongjia Meteorological Bureau, Yongjia 325100, Zhejiang, China
  • Received:2016-12-06 Revised:2017-07-06 Online:2017-10-25 Published:2018-01-27

摘要: 目前通用的通量观测技术涡动相关仪(EC)在区域陆面模式验证中存在能量不闭合和空间代表性有限的问题,寻求改进EC观测热通量的新技术是提高陆面模式验证效果的关键环节,大孔径闪烁仪(LAS)的出现有效改善了这一现状。基于黄土高原定西站2010年1月和6月的同步综合观测资料以及目前比较有代表性的陆面过程模式CLM的模拟数据,分析研究了LAS对EC观测地表能量不平衡问题的改进以及LAS对EC在区域陆面模式验证中的提高,结果表明:LAS可有效解决EC观测存在的地表能量不平衡问题,提高EC的地表能量闭合度,在非均匀下垫面LAS观测优势突出;利用LAS观测的感热通量进行区域陆面模式的验证,能够很大程度地避免EC能量不闭合和空间尺度不匹配在验证中造成的偏差,LAS观测更适合于大尺度模拟的验证,验证效果更好。

关键词: 大孔径闪烁仪(LAS), 涡动相关仪(EC), 陆面通用模式(CLM), 非均匀下垫面, 模式验证

Abstract: The commonly used surface fluxes observed by Eddy Covariance system (EC) have the problems of energy unclosure and limited representative areas. The improvement of surface heat fluxes measurement is a critical for the validation of land surface models. The development of Large Aperture Scintillometer (LAS) effectively improved this situation. On the basis of observations from January to June 2010 and CLM modeled flux data of the same period, an analysis was made on the improvements of EC observed surface unclosure and validation of CLM by LAS. Results showed that:LAS efficiently improved the surface unclosure observed by EC, especially over heterogeneous surface; LAS could avoid the bias caused by the energy unclosure of EC and mismatch between spatial scales of CLM and EC when applied to validate the sensible heat flux modeled by CLM. Our study shows that LAS is more appropriate for the model validation in large scales, better performance compared to EC.

Key words: Large Aperture Scintillometer (LAS), Eddy Covariance (EC), Community Land Model (CLM), heterogeneous underlying surface, model validation

中图分类号: 

  • TH762