Caribbean-Florida Water Science Center (CFWSC)

Evapotranspiration and Carbon Flux

Evapotranspiration is the rate of transport of water vapor from the earth’s surface into the atmosphere.  Evapotranspiration can be computed as reference, potential, or actual evapotranspiration.   Reference evapotranspiration is that from a grass surface that is well-watered.  Potential evapotranspiration is that from a surface that has unlimited water (such as a lake).  Actual evapotranspiration is that which occurs under field conditions such as a crop-covered field, ecosystem or urban landscape.

Carbon flux is the vertical exchange of carbon from the ecosystem to the atmosphere.  It can be measured as exchange of carbon dioxide, movement of dissolved or particulate carbon (such as by streams), and methane emissions.

The USGS collects and calculates evapotranspiration and carbon-flux data, which are used by Federal, State, and local agencies for planning and operating water-resources projects and regulatory programs.  Actual evapotranspiration and carbon-flux data are collected at a network of stations.  Reference and potential evapotranspiration are computed for each year at a 2-kilometer grid for all land and water points in Florida, as described by Mecikalski and others (2018).

Actual Evapotranspiration

Actual Evapotranspiration

Actual evapotranspiration is that which occurs under field conditions, such as a crop-covered field.

Learn more

Reference and Potential ET

Reference and Potential ET

Reference evapotranspiration is that from a grass surface that is well-watered.  Potential evapotranspiration is that from a surface that has unlimited water (such as a lake). 

Download Data

Evapotranspiration Network

Evapotranspiration Network

USGS Florida Evapotranspiration Network is a network of 15 data collection sites representing various land cover types.

Learn more
Filter Total Items: 3
Date published: February 14, 2019
Status: Active

Actual Evapotranspiration for Florida

Evapotranspiration is a large component of the Florida water budget – generally second only to rainfall, but exceeding rainfall and all other components during droughts. The prominence of evapotranspiration highlights the need to accurately quantify this hydrologic component in quantitative analyses of watershed hydrology.  Spatio-temporal estimates of evapotranspiration throughout Florida are...

Date published: February 12, 2019
Status: Active

Reference and Potential Evapotranspiration

Evapotranspiration can be computed as reference, potential, or actual evapotranspiration.   Reference evapotranspiration is that from a grass surface that is well-watered.  Potential evapotranspiration is that from a surface that has unlimited water (such as a lake). 

Reference and potential evapotranspiration are computed at a 2-kilometer spatial resolution and daily timestep for the...

Date published: February 5, 2019
Status: Active

Evapotranspiration and Carbon-Flux Network

The U.S. Geological Survey Florida Evapotranspiration Network is a network of 15 data collection sites representing various land cover types, which provide long-term, accurate, and unbiased information that meets the needs of many diverse users. The USGS collects the evapotranspiration data needed by Federal, State, and local agencies for planning and operating water-resources projects and...

Contacts: