Atmospheric Radiation Measurement Climate Research Facility US Department of Energy

twrmr > Tower Water-Vapor Mixing RatioVAP Type(s) > Baseline

The purpose of the Tower Water-Vapor Mixing Ratio (TWRMR) value-added product (VAP) is to calculate water-vapor mixing ratios at the 25-meter and 60-meter levels of the meteorological tower and also report best-estimate temperature, relative humidity, and pressure measurements at the 2-meter, 25-meter, and 60-meter levels of the meteorological tower at the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) Central Facility.

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The VAP consolidates inputs from a variety of different ARM datastreams and produces a single output file each day, with data points spaced in one-minute intervals.

This VAP was updated in June 2021. Please consult the technical report for a detailed breakdown of the changes made.


  • Fixed
  • AMF1
  • AMF2
  • AMF3


twr: Facility-specific multi-level Meteorological Instrumentation

Active Locations

Facility Name Start Date
Central Facility, Lamont, OK 1998-04-01


Levin M, D Zhang, and K Gaustad. 2021. Tower Water-Vapor Mixing Ratio Value-Added Product Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-128. 10.2172/1804448.


Jensen M, S Giangrande, and P Kollias. 2014. The Mid-latitude Continental Convective Clouds (MC3E) Experiment Final Campaign Report. Ed. by Robert Stafford, U.S. DOE, Office of Science, Office of Biological and Environmental Research. DOE/SC-ARM-14-012. 10.2172/1192141.


Sivaraman C. 2012. ARM Climate Research Facility Quarterly Value-Added Product Report First Quarter: October 01-December 31, 2011. U.S. Department of Energy. DOE/SC-ARM-12-002.

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Damao Zhang
Pacific Northwest National Laboratory

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