Analysis of Turbulent Flux on Different Underlying Surfaces over Semi-arid Area

  • CHEN Lijing ,
  • ZHANG Lei ,
  • LIANG Jiening ,
  • ZHOU Xu
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  • College of Atmospheric Science, Lanzhou University, Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, Lanzhou 730000, China

Received date: 2016-03-29

  Online published: 2017-10-28

Abstract

In order to understand the land-atmosphere interaction between different conditions more deeply, we take eddy covariance technique proposed by Swinbank in 1951 primarily to analyse the turbulent flux which could describe the land-atmosphere interaction quantificationally on three types of underlying surfaces.We contrast the diurnal and seasonal variations of heat flux and momentum flux on loess plateau, grassland and cropland in semi-arid area by using turbulent data from January 2007 to December 2008, which comes from Semi-arid Climate and Environment Observatory of Lanzhou University (SACOL), the grassland and the cropland station in Tongyu.Combined with the conventional meteorological elements, the results show that:(1) At the SACOL, grassland station and cropland station of Tongyu, the diurnal variations of sensible and latent heat flux both show a typical "single-peak" structure.The peak value of sensible heat flux (Hs) in SACOL, grassland and cropland is 157.3 W·m-2, 144.8 W·m-2 and 140.3 W·m-2, which is the double of latent heat flux (LvE).(2) The heat flux mainly locate in -22.6~24.2 W·m-2 at night, and Hs is negative, LvE is positive.(3) The diurnal variation of the momentum flux(τ) shows the same law in the three station, the daily peak of τ in Tongyu is 0.25 kg·m-1·s-2, which in SACOL is 0.08 kg·m-1·s-2.(4) The diurnal variation of τ has an obvious difference in difference seasons, the daily range in spring and autumn is bigger than other seasons.(5) Except thermal factors, loess plateau has a stronger extinction effect on turbulent, atmosphere will be stable easier and quicker.

Cite this article

CHEN Lijing , ZHANG Lei , LIANG Jiening , ZHOU Xu . Analysis of Turbulent Flux on Different Underlying Surfaces over Semi-arid Area[J]. Plateau Meteorology, 2017 , 36(5) : 1325 -1335 . DOI: 10.7522/j.issn.1000-0534.2016.00101

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