TITLE: INDOEX: Maldives KCO Chemistry Ozonesonde Profiles (Lobert) Contact/Author: J.M. Lobert Center for Clouds, Chemistry and Climate Scripps Institution of Oceanography University of California, San Diego 9500 Gilman Drive La Jolla, CA 92093-0221 USA Email: jlobert@ucsd.edu; j.lobert@bigfoot.com Telephone: +1 858 822 0297 Fax: +1 858 534 4922 URL: http://www-indoex.ucsd.edu/observatory/ http://www-c4.ucsd.edu/ OR S.J. Oltmans National Oceanic and Atmospheric Administration (NOAA) Climate Monitoring and Diagnostics Laboratory (CMDL) Ozone and Water Vapor Group (OZWV) 325 Broadway R/CMDL-1 Boulder, CO 80303 USA Email: soltmans@cmdl.noaa.gov; Telephone: +1 303 497 6676 Fax: +1 303 497 5590 URL: http://www.cmdl.noaa.gov/ozwv/index.html OR B.J. Johnson: National Oceanic and Atmospheric Administration (NOAA) Climate Monitoring and Diagnostics Laboratory (CMDL) Ozone and Water Vapor Group (OZWV) 325 Broadway R/CMDL-1 Boulder, CO 80303 USA Email: bjohnson@cmdl.noaa.gov Telephone: +1 303 497 6842 Fax: +1 303 497 55 URL: http://www.cmdl.noaa.gov/ozwv/index.html 1.0 DATA SET OVERVIEW: The data set is a collection of 55 ozone soundings conducted at the Kaashidhoo Climate Observatory (KCO) during the INDOEX IFP January to March 1999. Data coverage includes 27 January 1999 and 28 March 1999. Ozone sondes were launched about once per day around 14:00 local time (09:00 Universal Time) KCO is located at 4.9664 degrees N and 73.4657 degrees E, the ozone sondes were launched from the ground less than 1 m above sea level (mean elevation of the site is about 0.5-1.0 m). KCO local time is UT + 5 hours. For website info, see authors. 2.0 INSTRUMENT DESCRIPTION: The use of ECC type balloon ozone sondes with Vaisala radiosondes has been described extensively in the literature (Komhyr et al, 1969, 1995). For a more detailed description of this experiment, see Lobert et al. (2000) or contact the authors. 3.0 DATA COLLECTION AND PROCESSING: Sondes were launched daily (with few exceptions) around 14:00 local time (09:00 UT) to coincide with the NOAA-14 satellite overpass. Data were calibrated, screened finalized according to NOAA/CMDL standard guidelines. For contents of each file, see DATA FORMAT below. Data reduction and quality control was carried out at NOAA/CMDL in accordance with CMDL's network protocols and those of the SHADOZ program (Thompson et al., 1999). Data intercomparison with a similar sonde launched by FA Julich (D. Kley et al.) on the R/V Ron Brown on 05. March 1999 showed good agreement within 5% at all altitudes. 4.0 DATA FORMAT: All files are in plain, tab-delimited ASCII text, file length is variable depending on maximum altitude reached. Filename convention: KCO.Ozone.Sonde.KAxxx.yyyymmdd.txt where "xxx" is the original flight number and "yyyymmdd" is the date in reverse order, e.g. 19990324 denotes the sonde launched on 24. March 1999. No more than one sonde was launched per day. For data version, see individual files. Full resolution data set headers as they appear in the files: Time Pressure Altitude Temp. Theta Rel.Hum Dewpoint OzonePP OzoneMR FrostPoint Water Flag Pump X1 X2 X3 [min] [hpa] [km] [degC] [K] [%] [degC] [mPa] [ppmv] [degC] [ppmv] [] [degC] [] [] [] 0.00 1006.90 0.001 29.38 301.9 57.6 19.98 4.528 4.50E-02 0.00 6.07E+03 0 37.2 37.850 12.030 69.000 Header explanation: Time (UT) - Pressure - Altitude - Temperature (ambient) - Theta (pot. Temp.) - Relative Humidity - Dewpoint - Ozone Partial Pressure - Ozone Mixing Ratio - FrostPoint - Water Vapor (not used here) - Flag (not used here) - Pump Temperature - X1 (not used here) - X2=Battery voltage for pump and board - X3=pump motor current in milli-Ampere 5.0 DATA REMARKS: No data are available for these days: 29 February, 02 March, 03 March, 13 March, 16, 17, 18 March. Data files are available with data averaged over 100 meter intervals at the CMDL ftp site: ftp://huey.cmdl.noaa.gov/pub/ozone/Kaashidhoo/ However, these files contain different headers and a different naming convention (by flight number): kaXXX.L100 with XXX being the flight number (001 to 057). Flight numbers 44 (13. March) and 47 (16. March) were unsuccessful and not included in this dataset here. 6.0 REFERENCES: 1) Komhyr, W.D., Electrochemical cells for gas analysis, Ann. Geophys., 25, 203-210, 1969 2) Komhyr, W.D., R.A. Barnes, G.B. Brothers, J.A. Lathrop and D.P. Opperman, Electrochemical concentration cll ozonesonde performance evaluation during STOIC 1989, J. Geophys. Res. 100, 9231-9244, 1995. 3) J.M. Lobert, B.J. Johnson, S.J. Oltmans, J.M. Harris and S.K. Satheesh, Tropospheric and Column Ozone over Kaashidhoo, Indian Ocean, During INDOEX 99 From O3 Soundings. In progress for GRL.