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Important factors to model climate change effects on evapotranspiration

Snyder, Richard L. and Spano, Donatella Emma Ignazia (2008) Important factors to model climate change effects on evapotranspiration. Italian Journal of Agronomy, Vol. 3 (3 Suppl.), p. 619-620. ISSN 1125-4718. Article.

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Abstract

Although growers have considerable control over crop production, a major concern is the anticipated increase in evapotranspiration (ET) due to global warming. ET rates, however, are also affected by radiation, humidity, wind speed, crop morphology, and crop physiology in addition to temperature. Crop ET (ETc) is commonly estimated as the product of reference ET (ET0) and a crop coefficient (Kc), and the main factors affecting Kc values are net radiation, aerodynamic resistance, and canopy resistance differences between the reference and crop surfaces. The standardized ET0 equation has fixed values for the canopy resistance (rc), and different values are likely for other crops. The rc values might also adjust with increasing CO2 and higher temperature. Aerodynamic resistance (ra) depends on atmospheric stability, wind speed, and surface roughness. The relative aerodynamic contributions of sensible heat to ET0 and ETc could change if the canopy development or the wind speed climatology are modified by global warming. In this paper, we will discuss how the ET0 and Kc values vary with microclimate and how Kc values and ET0 rates might react to global warming.

Item Type:Article
ID Code:3719
Status:Published
Refereed:Yes
Uncontrolled Keywords:Crop production, evapotranspiration, global warming
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/03 Arboricoltura generale e coltivazioni arboree
Divisions:001 Università di Sassari > 01 Dipartimenti > Economia e sistemi arborei
002 Altri enti e centri di ricerca del Nord Sardegna > CMCC-EuroMediterranean Center for Climate Change, Sassari
Publisher:Forum editrice udinese
ISSN:1125-4718
Copyright Holders:© Italian Society for Agronomy
Publisher Policy:Depositato per gentile concessione dell'Editore e della Società italiana di agronomia
Additional Information:Oral presentation at the Multi-functional agriculture: agriculture as a resource for energy and environmental preservation: 10. Congress of the European Society of Agronomy, Bologna, Italy, 15-19 September 2008.
Deposited On:13 Apr 2010 13:06

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