DOI: 10.5194/hess-18-2021-2014
Scopus记录号: 2-s2.0-84901999552
论文题名: A new method to measure Bowen ratios using high-resolution vertical dry and wet bulb temperature profiles
作者: Euser T ; , Luxemburg W ; M ; J ; , Everson C ; S ; , Mengistu M ; G ; , Clulow A ; D ; , Bastiaanssen W ; G ; M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 6 起始页码: 2021
结束页码: 2032
语种: 英语
Scopus关键词: Atmospheric temperature
; Cables
; Sugar beets
; Telecommunication cables
; Temperature control
; Vapors
; Continuous observation
; Distributed temperature sensing
; High spatial resolution
; Independent measurement
; Multiple measurements
; New Measurement Method
; Sensible heat flux
; Temporal precision
; Heat flux
; Bowen ratio
; energy balance
; experimental study
; fiber optics
; latent heat flux
; radiation balance
; sensible heat flux
; temperature profile
英文摘要: The Bowen ratio surface energy balance method is a relatively simple method to determine the latent heat flux and the actual land surface evaporation. The Bowen ratio method is based on the measurement of air temperature and vapour pressure gradients. If these measurements are performed at only two heights, correctness of data becomes critical. In this paper we present the concept of a new measurement method to estimate the Bowen ratio based on vertical dry and wet bulb temperature profiles with high spatial resolution. A short field experiment with distributed temperature sensing (DTS) in a fibre optic cable with 13 measurement points in the vertical was undertaken. A dry and a wetted section of a fibre optic cable were suspended on a 6 m high tower installed over a sugar beet trial plot near Pietermaritzburg (South Africa). Using the DTS cable as a psychrometer, a near continuous observation of vapour pressure and air temperature at 0.20 m intervals was established. These data allowed the computation of the Bowen ratio with a high spatial and temporal precision. The daytime latent and sensible heat fluxes were estimated by combining the Bowen ratio values from the DTS-based system with independent measurements of net radiation and soil heat flux. The sensible heat flux, which is the relevant term to evaluate, derived from the DTS-based Bowen ratio (BR-DTS) was compared with that derived from co-located eddy covariance (R2 Combining double low line 0.91), surface layer scintillometer (R2 Combining double low line 0.81) and surface renewal (R2 Combining double low line 0.86) systems. By using multiple measurement points instead of two, more confidence in the derived Bowen ratio values is obtained. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78231
Appears in Collections: 气候变化事实与影响
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作者单位: Delft University of Technology, Water Resources Section, Stevinweg 1, 2628 CN Delft, Netherlands; Centre for Water Resources Research, School of Agriculture Earth and Environmental Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville-3209-Pietermaritzburg, South Africa
Recommended Citation:
Euser T,, Luxemburg W,M,et al. A new method to measure Bowen ratios using high-resolution vertical dry and wet bulb temperature profiles[J]. Hydrology and Earth System Sciences,2014-01-01,18(6)