Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0168-1923 |
EISSN | 1873-2240 |
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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