FIRE.ARCHV.GSFC.000001.0.19921113.19921207 KEITH EVANS CODE 917 GODDARD SPACEFLIGHT CENTER GREENBELT, MD 20771 19920818 19920831 1600 IBM PC (GATEWAY 2000), 386, 33 MHZ IBM PC 0123456789=:>/STUVWXYZ,(JKLMNOPQR*];+ABCDEFGHI.)[< GSFC RAMAN LIDAR WATER VAPOR MIXING RATIO DATA (G/KG) WITH ALTITUDES AND TIMES. THE ERROR IN THE DATA IS A FUNCTION OF ALTITUDE. WE BELIEVE THE DATA IS GOOD UP TO 10.229 KM MSL, WHICH IS ALL THAT IS SENT. THE ERROR FOR EACH WATER VAPOR DATA POINT IS INCLUDED IN THE DATASET. TIME IS IN SECS UT AND HEIGHT IN METERS. END OF GENERAL SEGMENT END OF ANCILLARY SEGMENT RECORD NAME: WAVAMIRA - WATER VAPOR MIXING RATIO W/ TIME,ALT,ERR 5120 KEITH EVANS CODE 917 GODDARD SPACEFLIGHT CENTER GREENBELT, MD 20771 GSFC_RAMAN_LIDR:GSFC WATER VAPOR RAMAN LIDAR RAMANLIDAR:WATER VAPOR RAMAN LIDAR NUM OF PROFILES IFTOT I*4 NUMBER I3 31 0 1 1 1 710 1 TIME OF PROFILE ITIME I*4 UT-SECONDS I5 31 0 60 60 0 86400UNEVEN INTVL NUM OF HEIGHTS ILINES I*4 NUMBER I3 31 0 1 1 1 131 1 HEIGHT IALT I*4 METERS I5 31 0 75 75 0 10 75 H2O VAP MIX RAT IWVMR I*4 G/KG I5 18 0 0 0 0 20 ALTITUDE,TIME WVMR ERROR IERR I*4 G/KG I5 18 0 0 0 0 1 ALTITUDE,TIME INSTRUMENT DESCRIPTION: THE GSFC WATER VAPOR RAMAN LIDAR USES AN EXCIMER (XEF) LASER AT 351 NM. THE TELESCOPE FILTERS OUT THE LASER WAVELENGTH AND THE RAMAN SHIFTED NITROGEN, OXYGEN AND WATER VAPOR WAVELENGTHS. THE WATER VAPOR TO NITROGEN RATIO IS USED TO CALCULATE THE WATER VAPOR MIXING RATIO. PROFILES OF DATA ARE COLLECTED EVERY MINUTE WITH A VERTICAL SPATIAL RESOLUTION OF 75 METERS. TEMPORAL CHARACTERISTICS: DATA IS SUMMED FOR ONE MINUTE IN THE DETECTORS AND SAVED TO A FILE. EACH NIGHT CONSISTS OF A SERIES OF ONE MINUTE PROFILES. FOR THE 10 MINUTE AVERAGED DATA, THE DATA IS SUMMED FOR 10 MINUTES BEFORE THE CALCULATIONS ARE PERFORMED. SPATIAL CHARACTERISTICS: EACH PROFILE HAS 75 METER RESOLUTION FROM 0.4135 TO 10.299 KILOMETERS. 0 KM IS MEAN SEA LEVEL. THE SITE ALTITUDE IS 0.229 KM AND THE FIRST DATA POINT IS AT 0.1845 KM AGL. CALIBRATION INFO: AT STARTUP, ALL CHANNELS RECEIVE THE SAME SIGNAL FROM THE TELESCOPE TO DETERMINE THE RELATIVE SENSITVITY BETWEEN CHANNELS. THEN, THE WATER VAPOR OVER NITROGEN RAMAN SHIFTED SIGNALS ARE PROPORTIONAL TO THE WATER VAPOR MIXING RATIO. THE WATER/NITROGEN RATIO IS CALIBRATED TO RADIOSONDES COINCIDENT DURING THIS TIME TO DETERMINE THE CONSTANT TO CONVERT THE WATER/NITROGEN RATIO TO WATER VAPOR VAPOR MIXING RATIO. REFERENCES: MELFI, S.H., LAWRENCE, J.D., AND MCCORMICK, M.P., 1969; "OBSERVATIONS OF RAMAN SCATTERING BY WATER VAPOR IN THE ATMOSPHERE", APPLIED PHYSICS LETTERS 15, 295-297. MELFI, S.H., AND WHITEMAN, D., 1985; "OBSERVATION OF LOWER-ATMOSPHERIC MOISTURE AND ITS EVOLUTION USING A RAMAN LIDAR", BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY 66, 1288-1292. MELFI, S.H., WHITEMAN, D., AND FERRARE, R., 1989; "OBSERVATION OF ATMOSPHERIC FRONTS USING RAMAN LIDAR MOISTURE MEASUREMENTS", JOURNAL OF APPLIED METEOROLOGY 28, 789-806. WHITEMAN, D.N., MELFI, S.H., AND FERRARE, R.A.,1992; "RAMAN LIDAR SYSTEM FOR THE MEASUREMENT OF WATER VAPOR AND AEROSOLS IN THE EARTH'S ATMOSPHERE", APPLIED OPTICS, VOL 31, NO 16, 1 JUNE 1992, P.3068-3082. SOFTWARE: C THIS CODE IS USED TO READ THE DATAFILE CHARACTER*14 BTIME,ETIME CHARACTER*40 FNAME,SNAME CHARACTER*80 TEXT INTEGER*4 IALT(140),ITIME(710) INTEGER*4 IWVMR(140,710),IERR(140,710) C RO3 CONTAINS THE HEIGHTS FOR EACH PROFILE (SAME HEIGHTS FOR EACH PROFILE) C STIME CONTAINS THE TIMES OF ALL PROFILES C DATA CONTAINS THE WATER VAPOR MIXING RATIO AS A FUNCTION OF HEIGHT AND TIME OPEN(11,FILE=FNAME,ACCESS='BINARY',FORM='UNFORMATTED') READ(11) BTIME,ETIME READ(11) TEXT READ(11) IFTOT DO I=1,IFTOT READ(11) ITIME(I) READ(11) ILINES DO J=1,ILINES READ(11) IALT(J),IWVMR(J,I),IERR(J,I) ENDDO ENDDO CLOSE(11) END OF OBSERVATION SEGMENT