Arid
DOI10.1016/j.agrformet.2015.07.004
A comparison of optical and microwave scintillometers with eddy covariance derived surface heat fluxes
Yee, Mei Sun1,2; Pauwels, Valentijn R. N.2; Daly, Edoardo2; Beringer, Jason3,4; Ruediger, Christoph2; McCabe, Matthew F.5; Walker, Jeffrey P.2
通讯作者Yee, Mei Sun
来源期刊AGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
EISSN1873-2240
出版年2015
卷号213页码:226-239
英文摘要

Accurate measurements of energy fluxes between land and atmosphere are important for understanding and modeling climatic patterns. Several methods are available to measure heat fluxes, and scintillometers are becoming increasingly popular because of their ability to measure sensible (H) and latent (LvE) heat fluxes over large spatial scales. The main motivation of this study was to test the use of different methods and technologies to derive surface heat fluxes.


Measurements of H and LvE were carried out with an eddy covariance (EC) system, two different makes of optical large aperture scintillometers (LAS) and two microwave scintillometers (MWS) with different frequencies at a pasture site in a semi-arid environment of New South Wales, Australia. We used the EC measurements as a benchmark. Fluxes derived from the EC system and LAS systems agreed (R-2 > 0.94), whereas the MWS systems measured lower H (bias similar to 60 W m(-2)) and larger LvE (bias similar to 65 W m(-2)) than EC. When the scintillometers were compared against each other, the two LASs showed good agreement of H (R-2 = 0.98), while MWS with different frequencies and polarizations led to different results. Combination of LAS and MWS measurements (i.e., two wavelength method) resulted in performance that fell in between those estimated using either LAS or MWS alone when compared with the EC system. The cause for discrepancies between surface heat fluxes derived from the EC system and those from the MWS systems and the two-wavelength method are possibly related to inaccurate assignment of the structure parameter of temperature and humidity. Additionally, measurements from MWSs can be associated with two values of the Bowen ratio, thereby leading to uncertainties in the estimation of the fluxes. While only one solution has been considered in this study, when LE was approximately less than 200 W m-2, the alternate solution may be more accurate. Therefore, for measurements of surface heat fluxes in a semi-arid or dry environment, the optical scintillometer is recommended, whereas further work will be required to improve the estimation of surface heat fluxes from microwave systems. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Evapotranspiration Eddy-covariance Scintillometer Sensible heat Latent heat
类型Article
语种英语
国家Australia ; Saudi Arabia
收录类别SCI-E
WOS记录号WOS:000361255400021
WOS关键词LARGE-APERTURE SCINTILLOMETER ; MILLIMETER-WAVE SCINTILLOMETRY ; FLEVOLAND FIELD EXPERIMENT ; ENERGY-BALANCE CLOSURE ; WATER-VAPOR ; SUBURBAN ENVIRONMENT ; HETEROGENEOUS SURFACE ; LAYER SCINTILLOMETER ; STRUCTURE PARAMETERS ; EFFECTIVE HEIGHT
WOS类目Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
来源机构University of Western Australia
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/185574
作者单位1.Monash Univ, Dept Civil Engn, Clayton, Vic 3168, Australia;
2.Monash Univ, Dept Civil Engn, Clayton, Vic 3168, Australia;
3.Monash Univ, Dept Geog & Environm Sci, Clayton, Vic 3168, Australia;
4.Univ Western Australia, Sch Earth & Environm, Crawley, WA 6009, Australia;
5.Univ Sci & Technol, Div Biol & Environm Sci & Engn King Abdullah, Thuwal, Saudi Arabia
推荐引用方式
GB/T 7714
Yee, Mei Sun,Pauwels, Valentijn R. N.,Daly, Edoardo,et al. A comparison of optical and microwave scintillometers with eddy covariance derived surface heat fluxes[J]. University of Western Australia,2015,213:226-239.
APA Yee, Mei Sun.,Pauwels, Valentijn R. N..,Daly, Edoardo.,Beringer, Jason.,Ruediger, Christoph.,...&Walker, Jeffrey P..(2015).A comparison of optical and microwave scintillometers with eddy covariance derived surface heat fluxes.AGRICULTURAL AND FOREST METEOROLOGY,213,226-239.
MLA Yee, Mei Sun,et al."A comparison of optical and microwave scintillometers with eddy covariance derived surface heat fluxes".AGRICULTURAL AND FOREST METEOROLOGY 213(2015):226-239.
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