Evapotranspiration at Starkey pasture site, daily data, Pasco County, Florida, January 2010 - April 2016
Dates
Publication Date
2017
Start Date
2010-01-01
End Date
2016-04-30
Citation
Swancar, Amy, 2017, Evapotranspiration data at Starkey pasture site, Pasco County, Florida, January 2010 - April 2016: U.S. Geological Survey data release, https://doi.org/10.5066/F7SF2TD9.
Summary
The data set consists of daily sums of 30-minute evapotranspiration measurements made at the USGS Starkey pasture climate station beginning January 1, 2010 and ending April 30, 2016. Annual evapotranspiration rates corrected to a near-surface energy-budget for the 12 calendar years of record at this site (2004-2015) varied from 718 millimeters (2007) to 903 millimeters (2010). The eddy-covariance method was used, with high-frequency sensors installed above the pasture to measure sensible and latent heat fluxes. Ancillary meteorological data are also included in the data set: rainfall and ground-water levels. Data were collected at 30-minute resolution, with evapotranspiration corrected to the near-surface energy-budget at that timescale. [...]
Summary
The data set consists of daily sums of 30-minute evapotranspiration measurements made at the USGS Starkey pasture climate station beginning January 1, 2010 and ending April 30, 2016. Annual evapotranspiration rates corrected to a near-surface energy-budget for the 12 calendar years of record at this site (2004-2015) varied from 718 millimeters (2007) to 903 millimeters (2010). The eddy-covariance method was used, with high-frequency sensors installed above the pasture to measure sensible and latent heat fluxes. Ancillary meteorological data are also included in the data set: rainfall and ground-water levels. Data were collected at 30-minute resolution, with evapotranspiration corrected to the near-surface energy-budget at that timescale. Data are presented at daily time intervals. Related data sets are presented at 30-minute and monthly time intervals. The study was conducted at a nearly flat, non-irrigated site (Latitude 28 13 31 North Longitude 82 33 33 West in degrees minutes seconds, NAD 1927, Section 13, Township 26S, Range 17E, NAD 1927) within the Anclote River Ranch property owned by the Southwest Florida Water Management District in Pasco County, Florida. The site was also within J.B. Starkey Wilderness Park. Instrumentation was installed in April 2003. The dominant (about 80 percent of surface coverage) plant cover at the study site is bahiagrass (Paspalum notatum) that varies from a lush green during the summer to a drab brown during the winter. The bahiagrass is ungrazed and grass height can reach 0.5 meter. During the study, the pasture was mowed periodically to 0.2 meters. Vegetation tables provided with the data release list when mowing occurred. Maximum grass rooting depth at the site is about 0.5 meters. Other plants at the study site, intermixed with the bahiagrass and occurring as distinct patches, include bushy broom grass (Andropogon glomeratus), rush (Juncus spp.), dog fennel (Eupatorium capillifolium), flat-topped goldenrod (Euthamia minor), and groundsel tree (Baccharis halimifolia). Forested wetlands are present on the margins of Sandy Branch, a tributary to the Anclote River southwest of the site, and a small cypress dome (40 meter diameter) is located east of the site. The effects of these forested areas are assumed to be negligible, as the pasture area extends 175 meters away from the site in all directions and satisfies upwind fetch requirements for the height of the eddy covariance sensors (more than 100 times the final height of 1.5 meters). The soils at the site are Pomona fine sands with less than 5 percent organic content. For the 13 years of record at this site, the water table was always within 2 meters of land surface.
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StarkeyET_data_dailyMetadata02052017.xml Original FGDC Metadata
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StarkeyRelease2016_daily01202017.csv “CSV format data”
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Purpose
Data were collected to quantify evapotranspiration (ET) over a representative land cover (unimproved pasture) in west-central Florida. Evapotranspiration is a large but not-well quantified component of local and regional water budgets. Water budgets and models that use this improved estimate of evapotranspiration should provide more accurate predictions of effects on water resources attributable to changes in water use, land use, normal climate cycles, and long-term climate change. The full data release associated with this site consists of: 1. Starkey evapotranspiration, 30-minute data, from January 2010 through April 2016 (comma delimited text format) 2. Starkey evapotranspiration, daily data, from January 2010 through April 2016 (comma delimited text format) 3. Starkey evapotranspiration, monthly data, from May 2003 through April 2016 (comma delimited text format) 4. Ancillary files: Station analysis (pdf), Vegetation table (comma delimited text format), Vegetation photographs (pdf), and Equipment photographs (pdf). This metadata file corresponds to item 2: daily evapotranspiration data.
