Subject: Re: EPIC Radiometer Data Date: Tue, 19 Feb 2002 10:50:46 -0700 From: "Duane Hazen" Organization: NOAA To: Chris Fairall CC: Robert Wood Attached are text files that give the data formats. Note that Hughs_info.txt = 203190 out files mailbox_info.txt = 2331 new files SCI_info.txt = 203190 sci files duane Chris Fairall wrote: > Duane > Could you supply us a readme that describes the columns in the data. I > presume we want the 'sci' directory. CF > > Robert > There are three directories; you are probably interested in EPIC2 which > would be leg II of the epic2001 cruise (the stratocumulus leg). The 'SCI' > directory has been processed from RAW to give the LWP. The directories > labeled > > 203190 means that 20, 31, and 90 GHZ radiometer channels were used for the > LWP retrieval. > 2031 means that only the 20, 31 GHZ channels were used. > > I think you want to use the 203190 data when available because the 90 GHz > channel is much more sensitive to LWP. The data are in hourly files. The > data convention is YYMMDDHH for file names; the individual lines in the > files are YYMMDDHHMMSS. Each line is 1 minute of data. > > If there is missing data in the 203190 files, it probably means the 90 GHZ > brightness temperature was so high the 90 channel is saturated. In that > case, use the 2031 data. > > Duane will supply us with the data columns. > > Regards, CF > > Robert Wood wrote: > >> Chris Fairall wrote: >> >> > Yo >> > I have posted the data on my ftp site. >> > >> > ftp://ftp.etl.noaa.gov/et7/users/cfairall/EPIC/epic2001/microwave_data/ >> > >> > Neither Duane nor I have had a chance to study it, so I can't say what >> > kind >> > of problems it has. >> > >> > CF >> >> >> Chris, >> >> Do you have a readme file that explains the different columns of the >> data? >> Which directory should I be looking at for the most recent version of >> the EPIC LWP data? >> >> Regards >> >> Rob >> >> >> > >> > >> > Taneil Uttal wrote: >> > >> > > Bruce - >> > > Duane says he has delivered the processed microwave radiometer data >> > to >> > > you. Have you sent it to anyone at University of Washington? Rob >> > Wood >> > > (who works with Sandra Yuter and Chris Bretherton) would like to get >> > a >> > > hold of it. >> > > Taneil >> > > >> > > -- >> > > @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ >> > > >> > > An eye for an eye and all the >> > > world will be blind (Gandhi) >> > > >> > > Taneil Uttal >> > > Research Meteorologist >> > > R/E/ET6 >> > > 325 Broadway >> > > Boulder, Colorado 80305-3328 >> > > >> > > email: Taneil.Uttal@noaa.gov >> > > voice: (303) 497-6409 >> > > fax: (303) 497-6181 >> > > >> > > @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ >> >> -- >> =================================== >> Robert Wood >> Atmospheric Sciences >> University of Washington >> Seattle >> WA 98195 >> USA >> >> Phone: 206-543-1203 >> Fax: 206-685-9302 >> Email: robwood@atmos.washington.edu >> =================================== >> >> > -- Duane Hazen NOAA/ETL MS R/E/ET1 325 Broadway Boulder, CO 80305 Phone (303) 497-6366 EMail Duane.Hazen@noaa.gov --------------------------------------------------------------------- Hughs Radiometer Data Format Input general information %d %02d%02d%02d%02d%02d%02d %d %f %f %f %f %f %d %d %f %f %f %f\n, program_mode, year, mon, day, hour, min, sec, NUM_OF_FREQS, n_samples, elevation, azimuth, t_room, moisture_detect, flat_heater, latitude,longitude, pitch, roll Input radiometer channel information. for (j = 0; j < NUM_OF_FREQS; j++) { %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f %f\n, vt_hot[j], vt_ref[j], vt_sky[j], t_hot[j], t_ref[j], t_wg[j], t_box[j], t_diff[j], vt_diff[j], vt_dat[j], gain[j], fgain[j], rb[j], cf[j], xl[j], xb[j], tb[j], t_if[j] } Note: First line is 20.6 GHz, Second line is 31.65 GHz, Third line is 90.0 GHz Third line may or may not be present depending on system options. Input surface and environmental tempertures. %f %f %f %f %f %f %f %f %f\n, rel_humidity, temperature, pressure, pyro, irradiance, pergy, pergy_irr, t_junction, t_dome Input the infrared radiometer information. %f %f %f %f %f %f\n, t_ir, cbt, ir_cf[0], ir_cf[1], ir_cf[2], ir_cf[3] program_mode 00 Vertical pointing 10 Tip Curve Calibration year Present year mon Present month of year(1 - 12) day Present day of month hour Present hour of day (0-23) min Present minute of hour (0-59) sec Present second of minute (0-59) NUM_OF_FREQS Number of radiometer channels n_samples Number of data samples in this average elevation elevation angle of antenna azimuth azimuth angle of antenna t_room Temperature of the room moisture_detect moisture at the surface yes = 1 no = 0 flat_heater flat heater on = 1 off = 0 latitude latitude in degrees longitude longitude in degrees pitch Average pitch of radiometer during sample roll Average roll of radiometer during sample Note there will be one of these next inputs for each radiometer channel. vt_hot[j] Detector voltage for hot load vt_ref[j] Detector voltage for reference load vt_sky[j] Detector Voltage for antenna t_hot[j] Hot load temperature (K) t_ref[j] Reference load temperature (K) t_wg[j] Wave guide temperature (K) t_box[j] Instrument inside temperature (C) t_diff[j] t_hot[j] - t_ref[j] vt_diff[j] vt_hot[j] - vt_ref[j] vt_dat[j] vt_sky[j] - vt_ref[j] gain[j] t_diff[j] / vt_diff[j] fgain[j] Filtered gain[j] rb[j] Fgain[j] x vt_dat[j] cf[j] Calibration Coefficient xl[j] Calibration Coefficient xb[j] Offset Coefficient tb[j] Brightness Temperature (K) t_if[j] Mixer/If Temperature (C) rel_humidity surface Relative Humidity (0-100 %) temperature surface temperature (C) pressure Barometric Pressure (mb) pyro Pyrometer output voltage irradiance Pyrometer irradiance pergy Pergyometer output voltage pergy_irr Pergyometer irradiance t_junction Pergyometer junction temperature t_dome Pergyometer dome temperature t_ir Infrared radiometer output voltage cbt Cloud base temperature (C) ir_cf[0] Infrared calibration coefficient ir_cf[1] Infrared calibration coefficient ir_cf[2] Infrared calibration coefficient ir_cf[3] Infrared calibration coefficient --------------------------------------------------------------------- Mailbox Radiometer Data format %02d%02d%02d%02d%02d%02d %d %f %f %f/n yr, mon, day, hr, min, sec, mode, angle, pitch, roll %f %f %f %f %f %f %f %f %f/n sky[0], nsky[0], bb[0], nbb[0], tbb[0], tau[0], cf[0], tb[0], vapor %f %f %f %f %f %f %f %f %f/n sky[1], nsky[1], bb[1], nbb[1], tbb[1], tau[1], cf[1], tb[1], liquid yr year mon Present month in year (1-12) day Present day in month hr Present hour in day (0 - 23) min Present minute in hour (0-59) sec Present second in minute (0-59) mode Instrument mode 00 is fix angle pointing 10 is tip curve calibration angle elevation pointing angle (degrees) pitch radiometer pitch angle (degrees) roll radiometer roll angle (degrees) sky[0] detector voltage 23 Ghz pointing nsky[0] detector voltage 23 Ghz pointing + noise diode bb[0] detector voltage 23 Ghz black body nbb[0] detector voltage 23 Ghz black body + noise diode tbb[0] temperature of black body (K) tau[0] 23 Ghz Tau cf[0] calibration coefficient tb[0] 23 Ghz Brightness Temperature (K) vapor Integrated vapor (cm) sky[1] detector voltage 31 Ghz pointing nsky[1] detector voltage 31 Ghz pointing + noise diode bb[1] detector voltage 31 Ghz black body nbb[1] detector voltage 31 Ghz black body + noise diode tbb[1] temperature of black body (K) tau[1] 31 Ghz Tau cf[1] calibration coefficient tb[1] 31 Ghz Brightness Temperature (K) vapor Integrated liquid (cm) --------------------------------------------------------------------- Science Format Output Data Format %02d%02d%02d%02d%02d%02d %8.2f %8.2f %8.3f %8.3f %8.3f %8.3f %8.3f %8.3f %8.3f %8.3f %01d %8.3f 9.999 9.999 %11.6f %11.6f\n", d->year,d->mon,d->day,d->hour,d->min,d->sec,d->elevation,d->azimuth, d->vapor,d->liquid,d->cbt,d->tb[0],d->tb[1], d->temperature, d->rel_humidity,d->pressure,d->moisture_detect, d->tb[2], d->longitude,d->latitude year Present year mon Present month of year(1 - 12) day Present day of month hour Present hour of day (0-23) min Present minute of hour (0-59) sec Present second of minute (0-59) elevation elevation angle of antenna azimuth azimuth angle of antenna moisture_detect moisture at the surface yes = 1 no = 0 latitude latitude in degrees longitude longitude in degrees tb[0] Brightness Temperature (K) for 20 GHz tb[1] Brightness Temperature (K) for 31 GHz tb[2] Brightness Temperature (K) for 90 GHz rel_humidity surface Relative Humidity (0-100 %) temperature surface temperature (C) pressure Barometric Pressure (mb) cbt Cloud base temperature (C) vapor Vapor (cm) liquid Liquid (mm) Note that the 9.999 postions are for future data.