New Lifting Condensation Level Height VAP Available

Published: 22 June 2020
Plot for Lifting Condensation Level Height VAP at ARM Southern Great Plains sites
The plot shows lifting condensation levels (LCLs) on March 6, 2019, for seven ARM Southern Great Plains (SGP) facilities and six Oklahoma Mesonet stations, all within 60 kilometers of the SGP Central Facility (sgpC1). The map identifies each location according to the color in the legend and time series. Plotted LCL heights of the individual values for sites other than the SGP Central Facility are offset according to site altitude to account for any relative height difference.

A new value-added product (VAP)—Lifting Condensation Level Height (LCLHEIGHT)—computes LCL heights from continuous surface-air observations at the Atmospheric Radiation Measurement (ARM) user facility’s Southern Great Plains (SGP) atmospheric observatory.

The LCL is the altitude at which a parcel of (moist) surface air becomes saturated while ascending dry-adiabatically.

LCLHEIGHT is used as input to the Large-Eddy Simulation (LES) ARM Symbiotic Simulation and Observation (LASSO) activity. Within LASSO, the LCL helps with identifying clouds coupled to the surface and evaluating the large-eddy simulation’s LCL height in the context of regional LCL variability.

The VAP computes LCL heights from continuous, 1-minute measurements of surface atmospheric state at 16 SGP facilities and 133 Oklahoma Mesonet environmental monitoring stations. LCLHEIGHT also includes the associated surface pressure, air temperature, and moisture content in the form of relative humidity.

LCLHEIGHT data from January 1, 2017, to December 30, 2019, are now available. The VAP will be run operationally on additional data as they become available.

More information on LCLHEIGHT can be found on the VAP web page. Feedback on the VAP can be sent to Tami Fairless.

Users can access the LCLHEIGHT data in the ARM Data Center. (Go here to create an account to download the data.)

To cite LCLHEIGHT data, please use doi:10.5439/1631820.

# # #

ARM is a DOE Office of Science user facility operated by nine DOE national laboratories.