New Microwave Radiometer Retrievals VAP Data Available for Several ARM Campaigns and Sites

Published: 20 February 2019
Microwave radiometers, such as this one at ARM’s North Slope of Alaska atmospheric observatory, provide time-series measurements of column-integrated amounts of water vapor and liquid water.

The Microwave Radiometer Retrievals (MWRRET) value-added product (VAP) has been processed for the following Atmospheric Radiation Measurement (ARM) user facility field campaigns and measurement sites:

The MWRRET VAP retrieves column precipitable water vapor and liquid water path—both important variables to understanding radiative transfer in the atmosphere and clouds—from ARM’s 2-channel microwave radiometers. The VAP uses a physical retrieval methodology and bias correction that provides improved retrievals over the standard statistical coefficient method.

MWRRET data are available in two types. The s1/s2 classification indicates “summary” files with fewer auxiliary variables and summarized quality control (qc) flags. The c1/c2 files include all additional variables and detailed qc flags. The retrieved values are the same in the c2 or s2 level files.

The NSA and SGP releases upgrade previously available MWRRET data from preliminary level 1 (c1/s1) processing, which provide only a running bias correction to the 30 GHz channel, to level 2 (c2/s2) processing. This processing includes more careful bias corrections for both the 23 GHz and 30 GHz channel measurements, resulting in a more accurate retrieval.

LASIC retrievals are available from two locations on Ascension Island: the main ARM Mobile Facility site (data files labeled M1) and a supplementary deployment at the airport (data files labeled S1).

Feedback on the VAP can be sent to Laura Riihimaki.

More information on MWRRET is available on the VAP web page. To access these data, log in to the ARM Data Center. (Go here to request an account.)

To cite the MWRRET data, please use doi:10.5439/1285691.

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