gov.noaa.ncdc:C00294 National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce Unknown tabular digital data http://www.ncdc.noaa.gov http://www.cmdl.noaa.gov/info/ftpdata.html Surface Ozone IN-SITU Measurements - Hourly Averages is historical digital data set DSI-3270, archived at the National Climatic Data Center (NCDC). DSI-3270 contains data from the Climate Monitoring Diagnostics Laboratory (CMDL), a part of the National Oceanic Atmospheric Administration's Environmental Research Laboratories (NOAA/ERL). CMDL does long-term monitoring of atmospheric trace constituents. One of these constituents is surface ozone hourly data. There are four baseline observatories maintained and operated by CMDL in widely separate locations where local pollution and anthropogenic influences are often non-existent. These sites are Barrow, Alaska; Mauna Loa Observatory, Hawaii; Cape Matatula, American Samoa; and South Pole, Antarctica. NCDC has historical data from 1973 or 1975 (depending on the station) to 1992. Ozone is measured continuously at these sites. DSI-3270 consists of one-hour average values of ozone. To make a wide range of climatic data available to researchers and the public. data set C00294 OZONE DETECTORS OZONE MONITORS OZONE SENSOR OZONEMETERS 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 19730101 19921231 Ground Condition Complete As Needed -175.0 -155.0 72.0 -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 > OZONE EARTH SCIENCE > ATMOSPHERE > AIR QUALITY > TROPOSPHERIC OZONE GCMD Location Valids ANTARCTICA NORTH AMERICA HAWAIIAN ISLANDS AMERICAN SAMOA UNITED STATES OF AMERICA GCMD Location Valids LAND SURFACE TROPOSPHERE CMDL > Climate Monitoring and Diagnostics Laboratory (NOAA) NOAA Climate Monitoring Diagnostics Laboratory Stations CMDL OZONE DETECTORS CMDL > Climate Monitoring and Diagnostics Laboratory (NOAA) NOAA Climate Monitoring Diagnostics Laboratory Stations CMDL OZONE MONITORS CMDL > Climate Monitoring and Diagnostics Laboratory (NOAA) NOAA Climate Monitoring Diagnostics Laboratory Stations CMDL OZONE SENSOR CMDL > Climate Monitoring and Diagnostics Laboratory (NOAA) NOAA Climate Monitoring Diagnostics Laboratory Stations CMDL OZONEMETERS 1 None None Not provided Unknown Completeness information not available. Not derived from another source. Unknown Positions 1-3: RECORD-TYPE - The type of data stored in this record. Value is "HLY". Each record contains one day of hourly values. Positions 4-11: STATION-ID - Contains the WBAN Station Number. (Assigned by NCDC.) Range of values: 21511 (MLO), 27514 (BRW), 61707 (SMO), 90002 (SPO). Eight digit station numbers are always right justified, zero filled. Positions 12-15: ELEMENT-TYPE - The type of data element stored in this record. OZPP - (Ozone Partial Pressures) Positions 16-17: ELEMENT-UNITS - The units and decimal position of the data value for this record. The element units used for this data record are NB - Nannobars in tenths. Positions 18-21: YEAR - This is the year of the record. Range of Value is 1973 - current year processed. Positions 22-23: MONTH - This is the month of the record. Range of value is 01-12. Position 24: SOURCE-CODE-1 - Contains a code that indicates the instrument type used in taking the data. Values are 1, 7, and 9: SOURCE CODE TABLE 1 ECC 7 Dasibi 9 Other/Unknown Position 25: SOURCE-CODE-2 - Contains a code that indicates the back-up instrument type used in taking the data. (blank) NOTE: The Source code not used at this time. Positions 26-27: DAY - Contains the day of the record. Range of value is 01-31. Positions 28-30: NUM-VALUES - This notates the actual number of values reported. Range of values is 001-024. Note: All positions after 30 are the data section. The number of data values in the data section is NUM-VALUES. Each data value is a block consisting of 12 characters. Positions 31-42, which comprise the first 12-character data value block, are described below. The same description applies to all blocks. A record may contain fewer or more data values than you might expect. There may be only one data value, or there may be data values for all possible times of observation. Positions 31-34: TIME-OF-VALUE - Range 0100-2400 contains the hour of the hourly element value. Times are expressed in Greenwich Mean Time (GMT). Position 35: SIGN-OF-METEOROLOGICAL-VALUE - This is the 'SIGN' of the meteorological data value (Tape Field 013). A blank represents a positive value or a minus sign represents a negative value. The sign is always blank. Positions 36-40: DATA-VALUE - Actual data value. This field is a five digit integer. Units and decimal position are indicated in the ELEMENT-UNITS field described in Tape Field 004. Missing values which contain a flag other than blank (see Flag-1 and Flag-2 fields) are assigned 99999. Missing Values which contain blank flag fields (ie., no observation made) are not included in the variable length record structure. Position 41: FLAG-1 - The data measurement FLAG. (blank) Flag not used. Position 42: FLAG-2 - The data quality FLAG. (blank) Flag not used. 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-3270 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