GasEx98_readme.txt 07/11/00 16:36 ================= =============================================================================== Daniel B. King, James H. Butler, Stephen A. Montzka, James W. Elkins. National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory, Halocarbons and other Atmospheric Trace Species (NOAA/CMDL/HATS) mail contact: NOAA/CMDL/HATS, 325 Broadway R/CMDL1, Boulder, CO 80303, USA email contacts: dking@cmdl.noaa.gov, jbutler@cmdl.noaa.gov =============================================================================== data ftp server: ftp://ftp.cmdl.noaa.gov/hats/ocean/gasex_98/ data web server: ---------------------------------------------------------------------- If you use any of these data, please acknowledge this source! ---------------------------------------------------------------------- The files in this directory are from the NOAA/CMDL Halocarbons and other Atmospheric Trace Species (HATS) group's GasEx 98 ocean expedition. GasEx 98 took place in the North Atlantic and Northeastern Pacific Oceans starting in Miami, Florida on May 7, 1998 and ending in Newport, Oregon on July 27, 1998 with port stops in Lisbon, Portugal; Ponta Delgada, Azores; and Miami, Florida. The following files are available in this directory: =============== GasEx98data.xls =============== Saved as an excel file (Excel for Windows 95, version 7.0). A datafile with meteorological, position, other ancillary data, and both air and water data for methyl bromide. Other compounds will be added as the data are published. The first line of the file contains the headers listed below. There are 1590 rows of data. Most of the meteorological data were taken from the ship's sensors except where stated. Missing data are replaced by the string "NA" = "not available". Column name data format remarks ---------------------------------------------------------------------- A minus sign in front of the format means that this column contains at least some data with a minus sign. Date 4.5 Decimal year = DOY/365+1998 DOY 3.3 Decimal Julian day of year 1998 (universal time) Latitude 2.4 Latitude in degrees North Longitude -3.4 Longitude in degrees East COG 3.3 Course over ground (degrees) SOG 2.3 Speed over ground (knots) Gyro 3.3 Ship's heading, the direction in which the ship's bow is pointing, which is different from the actual movement in strong winds (degrees). TSG_SST 2.4 Sea surface temperature (°C) recorded at the TSG (thermosalinograph), which delivered salinity and was also linked to the fluorometer. No temperature was recorded for the first 12 lines of the fourth leg (lines 1236-1247 of this file). Sal 2.4 Salinity from the TSG (PSU). No salinity was recorded for the first 12 lines of the fourth leg (lines 1236-1247 of this file). Press 4.2 Atmospheric pressure (mb) Precip 1.1 Precipitation rate (mm/hr) AirT 2.4 Air temperature (°C). Values of -99 are used to identify obvious flyers in the dataset. Fluoro 2.5 Fluorometer output signal, adjusted for range changes (a.u.). The final 204 lines do not contain any data. Rwind2sp 2.4 Wind speed relative to the ship (knots) from sensor 2. Twind2sp 2.4 True wind speed (knots)from sensor 2. The true wind speed was calculated from the speed over ground (SOG) instead of the speed through water (which was not measured) and has a slight inaccuracy in it. Twind2dir 3.3 True wind direction (degrees) from sensor 2. The following headings will be the same for each compound listed. MFair 2.2 Dry mole fraction in air (ppt, pmol/mol) PPair 2.2 Partial pressure in air (patm). This is the mole fraction corrected for water vapor pressure. MFwater 3.2 Dry mole fraction in air that was equilibrated with surface water (ppt, pmol/mol). PPwater 3.2 Partial pressure in equilibrated air (patm). This is the mole fraction corrected for water vapor pressure. SA -2.3 Saturation anomaly (partial pressure difference between air and seawater, where a positive value indicates a flux from the ocean to the atmosphere). ==================== GasEx98_CH3Brair.txt ==================== Saved in windows tab-delimited text format. This datafile contains the CH3Br air data with the associated met data, in an ascii format. The column headings and meanings are listed below: Column name remarks ---------------------------------------------------------------------- Date Decimal year = DOY/365+1998 DOY Decimal Julian day of year 1998 (universal time) Latitude Latitude in degrees North Longitude Longitude in degrees East COG Course over ground (degrees) SOG Speed over ground (knots) Gyro Ship's heading, the direction in which the ship's bow is pointing, which is different from the actual movement in strong winds (degrees). TSG_SST Sea surface temperature (°C) recorded at the TSG (thermosalinograph), which delivered salinity and was also linked to the fluorometer. No temperature was recorded for the first 12 lines of the fourth leg (lines 1236-1247 of this file). Sal Salinity from the TSG (PSU). No salinity was recorded for the first 12 lines of the fourth leg (lines 1236-1247 of this file). Press Atmospheric pressure (mb) Precip Precipitation rate (mm/hr) AirT Air temperature (°C). Values of -99 are used to identify obvious flyers in the dataset. Fluoro Fluorometer output signal, adjusted for range changes (a.u.). The final 204 lines do not contain any data. Rwind2sp Wind speed relative to the ship (knots) from sensor 2. Twind2sp True wind speed (knots)from sensor 2. The true wind speed was calculated from the speed over ground (SOG) instead of the speed through water (which was not measured) and has a slight inaccuracy in it. Twind2dir True wind direction (degrees) from sensor 2. CH3Br MFair CH3Br dry mole fraction in air (ppt, pmol/mol) CH3Br PPair CH3Br partial pressure in air (patm). This is the mole fraction corrected for water vapor pressure. ====================== GasEx98_CH3Brwater.txt ====================== Saved in windows tab-delimited text format. This datafile contains the CH3Br seawater data with the associated met data, in an ascii format. The column headings and meanings are listed below: Column name remarks ---------------------------------------------------------------------- Date Decimal year = DOY/365+1998 DOY Decimal Julian day of year 1998 (universal time) Latitude Latitude in degrees North Longitude Longitude in degrees East COG Course over ground (degrees) SOG Speed over ground (knots) Gyro Ship's heading, the direction in which the ship's bow is pointing, which is different from the actual movement in strong winds (degrees). TSG_SST Sea surface temperature (°C) recorded at the TSG (thermosalinograph), which delivered salinity and was also linked to the fluorometer. No temperature was recorded for the first 12 lines of the fourth leg (lines 1236-1247 of this file). Sal Salinity from the TSG (PSU). No salinity was recorded for the first 12 lines of the fourth leg (lines 1236-1247 of this file). Press Atmospheric pressure (mb) Precip Precipitation rate (mm/hr) AirT Air temperature (°C). Values of -99 are used to identify obvious flyers in the dataset. Fluoro Fluorometer output signal, adjusted for range changes (a.u.). The final 204 lines do not contain any data. Rwind2sp Wind speed relative to the ship (knots) from sensor 2. Twind2sp True wind speed (knots)from sensor 2. The true wind speed was calculated from the speed over ground (SOG) instead of the speed through water (which was not measured) and has a slight inaccuracy in it. Twind2dir True wind direction (degrees) from sensor 2. CH3Br MFwater CH3Br dry mole fraction in air that was equilibrated with surface water (ppt, pmol/mol). CH3Br PPwater CH3Br partial pressure in equilibrated air (patm). This is the mole fraction corrected for water vapor pressure. CH3Br SA CH3Br saturation anomaly (partial pressure difference between air and seawater, where a positive value indicates a flux from the ocean to the atmosphere). Other gases will follow at a later point in time.