Title:		Microwave radiometer and met tower observations
Location:	Belle Mina Site for Vortex-SE-2016      
Lat/Lon:	34.690 degN, -86.885 degE
Date updated: 	15 August 2016
Contact: 	Dave Turner, NOAA (dave.turner@noaa.gov)

--- Background

The microwave radiometer measures downwelling microwave radiance in 14 channels from 22.2 to 60.0 GHz at 1 s temporal resolution.  It is one of the core instruments in the Collaborative Lower Atmospheric Mobile Profiling System (CLAMPS-1) facility.  

A simple statistical retrieval is performed to retrieve precipitable water vapor (PWV) and liquid water path (LWP) from the observations at 23.8 and 31.4 GHz (Turner et al. 2007).  

This microwave radiometer has a Vaisala all-weather met station included.  This station is positioned about two feet above the back of the CLAMPS trailer.  It is possible that the trailer is affecting these met station observations in some conditions.  Note that the wind directions in this file are in error as the orientation of the trailer is not accounted for in the netCDF files.  The wind direction data should be rotated 90 degrees (e.g., winds that are reported as 0 degrees (i.e., northerly) are really 270 degrees (i.e., westerly).  Note that the data files mistakenly say that the orientation was accounted for, it was not.

This dataset was collected north of Belle Mina, Alabama, during the VORTEX-SE-2016 field campaign.  The microwave radiometer was calibrated with liquid nitrogen just prior to deployment.


--- References

Turner, D.D., S.A. Clough, J.C. Liljegren, E.E. Clothiaux, K. Cady-Pereira, and K.L. Gaustad, 2007: Retrieving liquid water path and precipitable water vapor from Atmospheric Radiation Measurement (ARM) microwave radiometers. IEEE Trans. Geosci. Remote Sens., 45, 3680-3690, doi:10.1109/TGRS.2007.903703.

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