gov.noaa.ncdc:C00362 National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Unknown tabular digital data http://www.ncdc.noaa.gov CMDL Global Flask Sample Surface Methane is historical digital data set DSI-3272 archived at the National Climatic Data Center (NCDC). The data set contains data from 38 stations around the world with varying periods of data. The data period is 1983-1991, with some stations having less than that. The data set is historical and has a format similar but not identical to the one in use at CMDL today. The format is not the element type format that is standard for the NCDC DS-32xx family of data sets. No data has been added since the 1991 data year. Air samples were analyzed by the Climate Monitoring and Diagnostics Laboratory (CMDL), which is at present part of the Office of Oceanic and Atmospheric Research (OAR) of the US National Oceanic and Atmospheric Administration (NOAA), and were provided to NCDC. The major parameters are the station identifier, methane (CH4) mixing ratio in parts per billion (ppb) and the date and time that the samples were obtained To make a wide range of climatic data available to researchers and the public. data set C00362 FLASKS CMDL > NOAA Climate Monitoring Diagnostics Laboratory Stations CMDL > Climate Monitoring and Diagnostics Laboratory (NOAA) National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce 19830101 19911231 Ground Condition Complete As Needed -180.0 180.0 90.0 -90.0 ISO 19115 Topic Category climatologyMeteorologyAtmosphere 004 DIF Discipline Keyword Thesaurus Earth Sciences > Atmosphere > Meteorology Earth Sciences > Atmosphere > Climatology Earth Sciences > Atmosphere > Weather GCMD Sciences Keyword Valids EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > TRACE GASES EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > METHANE GCMD Location Valids GLOBAL GCMD Location Valids LAND SURFACE CMDL > Climate Monitoring and Diagnostics Laboratory (NOAA) NOAA Climate Monitoring Diagnostics Laboratory Stations CMDL FLASKS 1 None None Not provided Unknown Completeness information not available. Not derived from another source. Unknown Positions 1-3: Station ID This is a 3-character alphanumeric representing station identifier assigned by CMDL. Allowable values are listed under topic STATION: Network participation, along with station name and other identifier information. Positions 5-12: Collection Date This is an 8-character integer representing the Greenwich Mean Time (GMT) date (year, month, day) that the flask sample was collected at the cooperative station. Allowable values range from 83 01 01 to 91 12 31. Positions 14-15: Collection Hour This is a 2-character integer representing the GMT hour that the sample was collected at the cooperative station. Allowable values are 00 to 23 and 99, where 99 represents a missing value. Positions 17-18: Collection Minute This is a 2-character integer representing the GMT minute that the sample was collected at the cooperative station. Allowable values are 00 to 59 and 99, where 99 represents a missing value. Positions 20-26: CH4 concentration This is a 7-character real number representing the methane mixing ratio in parts per billion (ppb = parts in a 10*9 volume of the air sample). An example of a value for this field is 1551.98 ppb. Positions 28-35: Flask ID This is an 8-character alphanumeric representing the flask-id assigned to each flask. The code may be used to aid in combining the methane measurement data with carbon dioxide data obtained from the same flask. The Flask ID and Collection Data and Time uniquely identify each flask observation. Position 37: Collection Method This is a 1-character alphanumeric representing the method that was used in collecting the flask sample. Allowable values are: P - Portable, battery-powered suitcase sampler. Two flasks normally connected in series, flushed with air, and then pressurized to 1.25-1.5 ambient atmospheric pressure. T - Filling of an evacuated 3-liter glass flask by opening the single O-ring sealed stopcock S - Filling of 0.5 liter glass flasks (in pairs) at the NOAA/CMDL observatory sites. Flasks are filled and pressurized by diverting air from continuous in situ CO2 analysis systems. N - Filling and pressurizing of 0.5 liter glass flasks (in pairs) by a pump different from that supplied by NOAA/CMDL (used with collection method P). In most cases (eg. at NWR and CGO) the pump is a Metal Bellows pump. In addition, the flasks filled by this method at the Cape Grim Baseline Air Pollution Station (site code CGO) are filled with air that has been dried chemically. F - Filling of an evacuated 5-liter glass flask by opening the single ground- glass greased stopcock. Positions 39-46: Analysis Date This is an 8-character integer representing the (local Boulder, CO time) date (year, month, day) that the flask sample was analyzed at CMDL. Allowable values range from 83 01 01 to 91 12 31. Position 49: Quality Flag This is a 1-character alphanumeric representing the corresponding quality flag assigned to each methane mixing ratio. Allowable values are: blank an absence of a flag (or a blank) indicates the sample and measurement were consider acceptable + samples in which CMDL believed to be non-background * samples with an obvious problem during sample collection or analysis. None National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Customer Service Mailing and physical

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Asheville North Carolina 28801-5001 USA 828-271-4800 828-271-4876 NCDC.Orders@noaa.gov DSI-3272 Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. 20060627 20060627 National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Customer Service Mailing and physical

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Asheville North Carolina 28801-5001 USA 828-271-4800 828-271-4876 NCDC.Orders@noaa.gov Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata FGDC-STD-012-2002