Vertical profiles of carbon dioxide and other trace gas species over the Amazon Basin using small aircraft. John B. Miller (john.b.miller@noaa.gov, 303-497-7739) Earth System Research Laboratory National Oceanic and Atmospheric Administration 325 Broadway Boulder, CO 80305-3328 USA Luciana V. Gatti (lvgatti@ipen.br) Divisao de Quimica Ambiental Insituto de Pesquisas Energeticas e Nucleares Sao Paulo, Brasil The data available here is the result of a collaboration between IPEN and NOAA. Please contact both lab PIs after downloading any data. ************************************************************* ************************************************************* **Sampling sites: 1. Santarem: Dec. 2000 - Dec. 2005 2. Fortaleza: Dec. 2000 - Mar. 2003 3. Manaus: Dec. 2004 - Dec. 2005 **Data organization: 1. Data from these three locations are located in folders with the same name. 2. Within each folder, there are files for each flight, which contain values for all gases measured: CO2, CH4, CO, H2, N2O, SF6, d13C of CO2 and d18O of CO2. Isotopic ratios are only available on samples obtained prior to 2004. Files are named according to the following conventions: a. [site].[yyyymmdd].mrg site= 'san' (santarem); 'ftl' (fortaleza); 'man' (manaus) yyyy= year mm= month dd= day '.mrg' means all gases are included in the file b. [site].mrg these files contain data from all flights from a given site **Data description: We collect air samples using small charter aircraft during regular flights over the Santarem area and over the Manaus area. We previously sampled above the Atlantic Ocean off the coast near Fortaleza. Small charter aircraft areused for the flights, and the samples are collected using automated equipment. Typically, each of 17 glass flasks in the automated flask samples is filled with air. Following sampling, flasks are analyzed at IPEN, Sao Paulo. Air samples collected prior to 2004 were analyzed at NOAA/CMDL, in Boulder, Colorado, USA. *Measurement precision: Measurement precision for each gas is as follows: a. CO2 0.1 ppm b. CH4 1-2 ppb c. CO 1 ppb d. H2 5 ppb e. N2O 0.3 ppb f. SF6 0.05 ppt g. d13C 0.01 per mil h. d18O xxx [data corrupted] Data can be obtained by anonymous ftp to ftp.cmdl.noaa.gov, cd pub/LBA. The data files are named with extensions "*.mrg". The file README.pfpmergedfile describes the file format. A. Fortaleza The Fortaleza samples are taken at about 3deg 31min S, 38deg 17min W. The altitudes are: Sample Altitude number (feet) 01 14000 02 13000 03 12000 04 11000 05 10000 06 9000 07 8000 08 7250 09 6500 10 5750 11 5000 12 4250 13 3500 14 2750 15 2000 16 1250 17 500 B. Santarem From December, 2000 through June, 2005, we flew two separate profiles. We take 10 samples over the km 67 tower (2deg 51.305 S, 54deg 57.563 W), and do a second profile of 7 samples about 30km east of the tower (2deg 52.547min S, 54deg 41.725min W). The altitudes are as follows: Sample Altitude number (feet) 01 12000 02 10500 03 9000 04 7500 05 6000 06 5000 07 4000 08 3000 09 2000 10 1000 11 1000 12 3000 13 5000 14 7000 15 9000 16 11000 17 12000 NOTE: The first Santarem flight, on December 7 2000, was an exception: The first 10 samples were obtained near 3deg 17min S, 55deg 5min W, and the last 7 samples were taken over the tower. Altitudes were as above, except that the last sample was at 13,000 feet. C. Manaus. At Manaus, two separte profiles were also flown through June 2005. The first location is above site 'ZF-2', the Km-34 eddy-flux tower (2 deg, 32 min S, 60 deg, 12 min W) and the second profile is NorthEast of Manaus (2 deg, 30 min S, 59 deg, 5 min W). The second profile was designed to ensure that samples were free of any potential pollution from the city of Manaus. Sample Altitude number (feet) 01 12000 02 10500 03 9000 04 7500 05 6000 06 5000 07 4000 08 3000 09 2000 10 1000 11 1000 12 3000 13 5000 14 7000 15 9000 16 11000 17 12000 D. New Altitudes for both MAN and SAN From 2006 to the present, only a single profile (at the first location) has been flown after analysis showed that there were not large differences between the two profiles at either site. The new altitudes are as follows: Sample Altitude number (feet) 1 14000 2 13000 3 12000 4 11000 5 10000 6 9000 7 8000 8 7000 9 6000 10 5000 11 4000 12 3500 13 3000 14 2500 15 2000 16 1500 17 1000 **Additional Information: Supporting information about trace gas concentrations in other parts of the world can be obtained at ftp.cmdl.noaa.gov/ccg/. ----------------- John Miller August 13, 2007