Epic 2001 cruise on R/V Ronald H. Brown

C. Fairall 3/29/00

chris.fairall@.noaa.gov

The ETL radar group operated a microwave radiometer (MWR) manufactured by Radiometrics Inc. (Boulder) for this cruise. Contact Duane Hazen (ETL) for details on the instrument. Duane used sondes and tipcals to 'calibrate' the system and gave me hourly files. I wrote a matlab program that read his data, stripped out the stuff I wanted, and wrote new files with the raw 21-s time resolution (micro_s.txt) and hourly time resolution (micro_h.txt). The data on the files is as follows:

micro_2.txt	size= (4549,22)

:,1	decimal julian date

:,2	IWV, integrated atmospheric water vapor (column precipitable water), cm

:,3	IWL, integrated cloud liquid content, cm

:,4	tau 20, optical thickness at 23 GHZ

:,5	tb 20, brightness temperature at 23 GHZ

:,6	tau 30, optical thickness at 31 GHZ

:,7	tb 30, brightness temperature at 31 GHZ

:,8	mode, instrument mode 00 is fix angle pointing 10 is tip curve calibration

:,9	tilt angle, for tip cal

:,10	cf20, calibration coefficient 23 GHz

:,11	cf30, calibration coefficient 31 GHz

:,12	sky20, detector voltage 23 Ghz pointing

:,13	nsky20, detector voltage 31 Ghz pointing + noise diode

:,14	bb20, detector voltage 23 Ghz black body

:,15	nbb20, detector voltage 23 Ghz black body + noise diode

:,16	tbb20, temperature of black body (K)

:,17	sky30, detector voltage 31 Ghz pointing

:,16	nsky30, detector voltage 31 Ghz pointing + noise diode

:,19	bb30, detector voltage 31 Ghz black body

:,20	nbb30, detector voltage 31 Ghz black body + noise diode

:,21	tbb30, temperature of black body (K)

:,22	pitch, deg

:,23	roll, deg

see below for a description of these variables

micro_h.txt	size= (391,6)

:,1	decimal julian date

:,2	IWC, integrated atmospheric water vapor (column precipitable water), cm

:,3	IWL, integrated cloud liquid content, cm

:,4	number of 21-s values in hourly median

:,5	standard deviation of IWV, cm

:,6	standard deviation of IWL, cm

To get this data, go to my ftp site: ftp://ftp.etl.noaa.gov/et7/anonymous/cfairall/EPIC/epic2001/microwave_data/

Included on the ftp site are the original hourly files from Duane Hazen (YYMMDDHH.new), his descriptions (datainfo.txt, pacs.txt), and the matlab file I did the processing with (micro_red.txt).