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 Hughes for this cruise; it is part of the MMCR package. Contact Duane Hazen (ETL) for details on the instrument. Duane used sondes and tipcals to 'calibrate' the system. I wrote a matlab program that read his .sci datafiles, stripped out the stuff I wanted, and wrote new files with the raw 60-
sec time resolution (micro_sec_90.txt) and hourly time resolution (micro_h.txt). The data on the files is as follows:

micro_sec_90.txt	size= (16707,18)

1	decimal julian date

2	Date, time	MMDDHHSS

3	elevation elevation angle of antenna

4	azimuth azimuth angle of antenna

5	vapor	Vapor (cm)

6	liquid	Liquid (mm)

7	cbt Cloud base temperature (C)

8	tb[0] Brightness Temperature (K) for 20 GHz

9	tb[1] Brightness Temperature (K) for 31 GHz

10	temperature surface temperature (C)

11	rel_humidity surface Relative Humidity (0-100 %)

12	pressure Barometric Pressure (mb)

13	moisture_detect moisture at the surface yes = 1 no = 0

14	tb[2] Brightness Temperature (K) for 90 GHz

15	-999	Unused

16	-999	Unused

17	longitude longitude in degrees

18	latitude latitude in degrees

micro_hr_90.txt	size= (480,7)

:,1	decimal julian date

:,2	number of 60-s values in hourly median

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

:,4	IWL, integrated cloud liquid content, cm

:,5	Tbrightness 21 GHz

:,6	Tbrightness 31 GHz

:,7	Tbrightness 90 GHz

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).