A New Method to Estimate Reference Crop Evapotranspiration from Geostationary Satellite Imagery: Practical Considerations

Bruin, H.A.R. de; Trigo, Isabel F.

doi:10.3390/w11020382

Cited by 20 publications

(17 citation statements)

References 18 publications

(74 reference statements)

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“…There is an underlying assumption of no advection in the RET definition for a reference grass field (Allen et al, 1998). However, in small fields, under arid conditions with high temperatures, local advection effects may occur when warm, dry air formed over an upwind, adjacent field is advected horizontally over the well‐watered fields (De Bruin & Trigo, 2019). This horizontal advection of sensible heat increases the ETa of water from well‐watered areas, where SMC is high and not limiting, but will result in the overestimation of ETa in water‐limited fields or areas.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of WaPOR V2 evapotranspiration products across Africa

Blatchford

Mannaerts

Njuki

et al. 2020

Hydrological Processes

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The Food and Agricultural Organization of the United Nations (FAO) portal to monitor water productivity through open‐access of remotely sensed derived data (WaPOR) offers continuous actual evapotranspiration and interception (ETIa‐WPR) data at a 10‐day basis across Africa and the Middle East from 2009 onwards at three spatial resolutions. The continental level (250 m) covers Africa and the Middle East (L1). The national level (100 m) covers 21 countries and 4 river basins (L2). The third level (30 m) covers eight irrigation areas (L3). To quantify the uncertainty of WaPOR version 2 (V2.0) ETIa‐WPR in Africa, we used a number of validation methods. We checked the physical consistency against water availability and the long‐term water balance and then verify the continental spatial and temporal trends for the major climates in Africa. We directly validated ETIa‐WPR against in situ data of 14 eddy covariance stations (EC). Finally, we checked the level consistency between the different spatial resolutions. Our findings indicate that ETIa‐WPR is performing well, but with some noticeable overestimation. The ETIa‐WPR is showing expected spatial and temporal consistency with respect to climate classes. ETIa‐WPR shows mixed results at point scale as compared to EC flux towers with an overall correlation of 0.71, and a root mean square error of 1.2 mm/day. The level consistency is very high between L1 and L2. However, the consistency between L1 and L3 varies significantly between irrigation areas. In rainfed areas, the ETIa‐WPR is overestimating at low ETIa‐WPR and underestimating when ETIa is high. In irrigated areas, ETIa‐WPR values appear to be consistently overestimating ETa. The relative soil moisture content (SMC), the input of quality layers and local advection effects were some of the identified causes. The quality assessment of ETIa‐WPR product is enhanced by combining multiple evaluation methods. Based on the results, the ETIa‐WPR dataset is of enough quality to contribute to the understanding and monitoring of local and continental water processes and water management.

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Section: Discussionmentioning

confidence: 99%

Evaluation of WaPOR V2 evapotranspiration products across Africa

Blatchford

Mannaerts

Njuki

et al. 2020

Hydrological Processes

View full text Add to dashboard Cite

show abstract

“…There is an underlying assumption of no advection in the RET definition for a reference grass field (Allen et al, 1998). However, in small fields, under arid conditions with high temperatures, local advection effects may occur when warm, dry air formed over an upwind, adjacent field is advected horizontally over the well-watered fields (De Bruin & Trigo, 2019). This horizontal advection of sensible heat increases the evapotranspiration of water from well-watered areas but will result in the overestimation of evapotranspiration in water-limited fields or areas.…”

Section: Latent Heat Flux and Evapotranspirationmentioning

confidence: 99%

WaPOR V2 quality assessment – Technical Report on the Data Quality of the WaPOR FAO Database version 2

Mannaerts¹,

Blatchford²,

Njuki³

et al. 2020

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The designations employed and the presentation of material in this information product do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations (FAO) concerning the legal or development status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. Dashed lines on maps represent approximate border lines for which there may not yet be full agreement. The mention of specific companies or products of manufacturers, whether or not these have been patented, does not imply that these have been endorsed or recommended by FAO in preference to others of a similar nature that are not mentioned.The views expressed in this information product are those of the author(s) and do not necessarily reflect the views or policies of FAO.

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“…Most research work relative to the local, farm scale is related to innovation on evapotranspiration and crop water requirements. The study by de Bruin and Trigo [4] refers to a new method to estimate reference crop evapotranspiration (ET o ) using products of the European geostationary satellite Meteosat Second Generation (MSG), thus analyzing benefits from computing ET o with solar radiation data of the Satellite Application Facility on Land Surface Analysis (LSA-SAF). Not only the method allows computing ET o when ground data on solar radiation are not available but also avoids advection effects.…”

Section: Innovation Issues At Local Scalementioning

confidence: 99%

Innovation Issues in Water, Agriculture and Food

Cameira

Pereira

2019

Water

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The main challenge faced by agriculture is to produce enough food for a continued increase in population, however in the context of ever-growing competition for water and land, climate change, droughts and anthropic water scarcity, and less-participatory water governance. Such a context implies innovative issues in agricultural water management and practices, at both the field and the system or the basin scales, mainly in irrigation to cope with water scarcity, environmental friendliness, and rural society welfare. Therefore, this special issue was set to present and discuss recent achievements in water, agriculture, and food nexus at different scales, thus to promote sustainable development of irrigated agriculture and to develop integrated approaches to water and food. Papers cover various domains including: (a) evapotranspiration and crop water use; (b) improving water management in irrigated agriculture, particularly irrigation scheduling; (c) adaptation of agricultural systems to enhance water use and water productivity to face water scarcity and climate change; (d) improving irrigation systems design and management adopting multi-criteria and risk approaches; (e) ensuring sustainable management for anthropic ecosystems favoring safe and high-quality food production, as well as the conservation of natural ecosystems; (f) assessing the impact of water scarcity and, mainly, droughts; (g) conservation of water quality resources, namely by preventing contamination with nitrates; (h) use of modern mapping technologies and remote sensing information; and (i) fostering a participative and inclusive governance of water for food security and population welfare.

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A New Method to Estimate Reference Crop Evapotranspiration from Geostationary Satellite Imagery: Practical Considerations

Cited by 20 publications

References 18 publications

Evaluation of WaPOR V2 evapotranspiration products across Africa

Evaluation of WaPOR V2 evapotranspiration products across Africa

WaPOR V2 quality assessment – Technical Report on the Data Quality of the WaPOR FAO Database version 2

Innovation Issues in Water, Agriculture and Food

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