Arid
DOI10.1117/12.2241436
Discrepancies between eddy covariance and lysimeter measurements in the assessment of energy balance modeling in vineyards
Sanchez, Juan M.1,2; Lopez-Urrea, Ramon3,4; Dona, Carolina5; Montoro, Amelia3,4; Caselles, Vicente5; Galve, Joan M.5
通讯作者Sanchez, Juan M.
会议名称Conference on Remote Sensing for Agriculture, Ecosystems, and Hydrology XVIII
会议日期SEP 26-28, 2016
会议地点Edinburgh, SCOTLAND
英文摘要

Remote sensing-based models are a potential technique when evapotranspiration (ET) estimates are needed on a regional scale. These remote sensing methods are typically validated and calibrated using in situ measurements. Eddy covariance (EC) and lysimetry are two of the most prevalent techniques for measuring ET. Some discrepancies arise between these two techniques consequence of the measurement footprint or the spatial variability in atmospheric and surface conditions. An experiment was carried out in the growing season of 2015 in a similar to 4 ha row-crop vineyard in a semi-arid advective location in Central Spain, encouraged by the necessity to assess the feasibility of EC measurements in this area and under these conditions. A 9-m(2) monolithic weighting lysimeter was available. An EC system was deployed together with a net radiometer and a set of soil heat flux plates. Data of the different terms of the energy balance equation were stored every 15 min, and then averaged at an hourly and daily scales. In this work we focus on the comparison between ET measurements from the two methods, EC and lysimetry. The imbalance in the surface energy budget was first analyzed. A lack of closure around 20% was observed. After forcing the closure, discrepancies between EC and lysimeter measurements still remained. Average estimation errors of +/- 0.09 mm h(-1) and +/- 0.5 mm d(-1) were obtained at hourly and daily scales, respectively, whereas a deviation of only 2% was observed in the accumulated ET for the entire experiment. These results support the use of adjusted EC technique to monitor accurate ET in vineyards.


英文关键词Eddy covariance lysimeter surface energy balance energy closure vineyard
来源出版物REMOTE SENSING FOR AGRICULTURE, ECOSYSTEMS, AND HYDROLOGY XVIII
ISSN0277-786X
出版年2016
卷号9998
ISBN978-1-5106-0401-8
EISBN978-1-5106-0400-1
出版者SPIE-INT SOC OPTICAL ENGINEERING
类型Proceedings Paper
语种英语
国家Spain
收录类别CPCI-S
WOS记录号WOS:000393152800022
WOS关键词CROP COEFFICIENTS ; NORTHWEST CHINA ; MAIZE FIELD ; EVAPOTRANSPIRATION ; CLOSURE ; FOREST ; GRAPES
WOS类目Agronomy ; Ecology ; Remote Sensing ; Water Resources
WOS研究方向Agriculture ; Environmental Sciences & Ecology ; Remote Sensing ; Water Resources
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/305679
作者单位1.Univ Castilla La Mancha, Inst Reg Dev, Dept Appl Phys, Av Espana S-N, Albacete 02071, Spain;
2.Univ Castilla La Mancha, IDR, Av Espana S-N, Albacete 02071, Spain;
3.Inst Tecn Agron Prov, Inst Reg Dev, Dept Appl Phys, Parque Empresarial Campollano 2,Avda 61, Albacete 02007, Spain;
4.FUNDESCAM, Av Espana S-N, Albacete 02007, Spain;
5.Univ Valencia, Fac Phys, Dept Earth Phys & Thermodynam, Dr Moliner 50, E-46100 Burjassot, Spain
推荐引用方式
GB/T 7714
Sanchez, Juan M.,Lopez-Urrea, Ramon,Dona, Carolina,et al. Discrepancies between eddy covariance and lysimeter measurements in the assessment of energy balance modeling in vineyards[C]:SPIE-INT SOC OPTICAL ENGINEERING,2016.
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