Urban Evapotranspiration in a Humid Environment - Orlando, Florida, USA

David M. Sumner, C.M.J. Jacobs

Research output: Chapter in Book/Report/Conference proceedingAbstract


An areally-integrated assessment of ET ux was obtained using eddy covariance methods over an urban/suburban landscape in the humid sub-tropical environment of Orlando, Florida, USA. Mean annual ET during the 3.5-year study period was 921 mm. On average, ET returned a large fraction of rainfall to the atmosphere (72 percent). But annual rainfall varied much more on a year-to-year basis (922 to 1,746 mm) than did urban ET (843 to 974 mm). Interestingly, 12-month periods of relatively high ET occurred during drier periods and
12-month periods of relatively low ET occurred during wetter periods. These results may be related to the generally drier atmosphere and less cloud cover that occur during lower rainfall periods. In addition, this largely urban environment is not subject to large soil moisture limitations because of the prevalence of lawn irrigation and lakes. Corroboration of the ET measurements was provided by independent water budgets for two watersheds that make up
much of the source area for the ET measurements. An urban analogue to the “crop coef€cient” concept was derived for the studied landscape. This metric was combined with an available satellite-based, State of Florida reference ET product (http://.water.usgs.gov/et/) to provide a method for transferring the results of this study to similar landscapes for other time periods and geographic areas. The results of this investigation in a humid, sub-tropical urban setting
are compared and contrasted with urban ET estimates for other environments
Original languageEnglish
Title of host publicationHeadwaters to estuaries: advances in watershed science and management—Proceedings of the Fifth Interagency Conference on Research in the Watersheds
EditorsC.E. Stringer, K.W. Krauss, J.S. Latimer
Place of PublicationAsheville, NC, USA
PublisherU.S. Department of Agriculture Forest Service, Southern Research Station
Publication statusPublished - 2016
EventFifth Interagency Conference on Research in the Watersheds, March 2-5, 2015, North Charleston - North Charleston, South Carolina, United States
Duration: 2 Mar 20155 Mar 2015


ConferenceFifth Interagency Conference on Research in the Watersheds, March 2-5, 2015, North Charleston
CountryUnited States
CityNorth Charleston, South Carolina

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