HDF5 file, superblock version 0
group /
	attribute dataset_calibration_scale = "H2_X2009"
	attribute dataset_citation = "Petron, G., Crotwell, A., Crotwell, M., Kitzis, D., Madronich, M., Mefford, T., Moglia, E., Mund, J., Neff, D., Thoning, K., & Wolter, S. (2023). Atmospheric Hydrogen Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 2009-2021 [Data set]. NOAA GML CCGG Division. Version: 2023-07-05, https://doi.org/10.15138/WP0W-EZ08"
	attribute dataset_comment = "For more information about these data, please see https://gml.noaa.gov/aftp/data/trace_gases/h2/flask/README_h2_surface-flask_ccgg.html"
	attribute dataset_contribution = "These data are provided by NOAA. Principal investigators include Gabrielle Petron (NOAA). Key partners include Dan Baumann (USGS) AND Kenneth J. Davis (PSU) AND Ankur Desai (UofWI)."
	attribute dataset_creation_date = "2023-07-05T13:00:15.051725"
	attribute dataset_description = "Atmospheric Hydrogen Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 2009-2021"
	attribute dataset_fair_use = "These data are made freely available to the public and the scientific community in the belief that their wide dissemination will lead to greater understanding and new scientific insights. The availability of these data does not constitute publication of the data.  NOAA relies on the ethics and integrity of the user to ensure that GML receives fair credit for their work.  If the data are obtained for potential use in a publication or presentation, GML should be informed at the outset of the nature of this work. If the GML data are essential to the work, or if an important result or conclusion depends on the GML data, co-authorship may be appropriate.  This should be discussed at an early stage in the work.  Manuscripts using the GML data should be sent to GML for review before they are submitted for publication so we can ensure that the quality and limitations of the data are accurately represented."
	attribute dataset_name = "h2_lef_surface-flask_1_ccgg_event"
	attribute dataset_num = 32
	attribute dataset_parameter = "h2"
	attribute dataset_parameter_industrial_name = "Molecular Hydrogen"
	attribute dataset_parameter_name = "Molecular Hydrogen"
	attribute dataset_platform = "fixed"
	attribute dataset_project = "surface-flask"
	attribute dataset_reciprocity = "Use of these data implies an agreement to reciprocate. Laboratories making similar measurements agree to make their own data available to the general public and to the scientific community in an equally complete and easily accessible form. Modelers are encouraged to make available to the community, upon request, their own tools used in the interpretation of the GML data, namely well documented model code, transport fields, and additional information necessary for other scientists to repeat the work and to run modified versions. Model availability includes collaborative support for new users of the models."
	attribute dataset_reference_1_name = "Novelli, P.C., K.A. Masarie, and P.M. Lang, Molecular hydrogen in the  troposhere: Global distributions and budget,  J. Geophys Res., 104, 30,427-30,444, 1999."
	attribute dataset_reference_2_name = "Novelli, P.C., Crotwell, A.M., and Hall, B.D, Application of Gas Chromatography with a Pulsed Discharge Helium Ionization Detector for Measurements of Molecular Hydrogen in the Atmosphere, Environ. Sci. Technol. 2009, 43, 2431-2436."
	attribute dataset_reference_total_listed = 2
	attribute dataset_selection = "event"
	attribute dataset_selection_tag = "event"
	attribute dataset_start_date = "2009-10-21T16:00:00Z"
	attribute dataset_stop_date = "2021-12-17T17:39:00Z"
	attribute dataset_usage_description = "Please cite the product's citation when using data from this dataset. Relevant literature references for this dataset are listed below for convenience."
	attribute dataset_warning = "Every effort is made to produce the most accurate and precise measurements possible.  However, we reserve the right to make corrections to the data based on recalibration of standard gases or for other reasons deemed scientifically justified.  We are not responsible for results and conclusions based on use of these data without regard to this warning."
	attribute lab_1_abbr = "NOAA"
	attribute lab_1_address1 = "325 Broadway"
	attribute lab_1_address2 = "NOAA R/GML-1"
	attribute lab_1_address3 = "Boulder, CO 80305-3328"
	attribute lab_1_country = "United States"
	attribute lab_1_country_flag = "https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNST0001.GIF"
	attribute lab_1_logo = "https://gml.noaa.gov/webdata/ccgg/ObsPack/images/logos/noaa_medium.png"
	attribute lab_1_name = "NOAA Global Monitoring Laboratory"
	attribute lab_1_number = 1
	attribute lab_1_ongoing_atmospheric_air_comparison = "T"
	attribute lab_1_parameter = "Lab has contributed measurements for: h2"
	attribute lab_1_url = "https://gml.noaa.gov/ccgg/"
	attribute lab_total_listed = 1
	attribute partner_1_abbr = "USGS"
	attribute partner_1_affiliation = "United States Geological Survey"
	attribute partner_1_country = "United States"
	attribute partner_1_name = "Dan Baumann"
	attribute partner_1_parameter = "Partner of measurements for: h2"
	attribute partner_1_url = "http://www.usgs.gov/"
	attribute partner_2_abbr = "PSU"
	attribute partner_2_address1 = "Department of Meteorology"
	attribute partner_2_address2 = "The Pennsylvania State University"
	attribute partner_2_address3 = "University Park, PA 16802"
	attribute partner_2_affiliation = "Penn State University"
	attribute partner_2_country = "United States"
	attribute partner_2_email = "kjd10@psu.edu"
	attribute partner_2_name = "Kenneth J. Davis"
	attribute partner_2_parameter = "Partner of measurements for: h2"
	attribute partner_3_abbr = "UofWI"
	attribute partner_3_affiliation = "University of Wisconsin"
	attribute partner_3_country = "United States"
	attribute partner_3_email = "desai@aos.wisc.edu"
	attribute partner_3_name = "Ankur Desai"
	attribute partner_3_parameter = "Partner of measurements for: h2"
	attribute partner_total_listed = 3
	attribute provider_1_address1 = "NOAA GML"
	attribute provider_1_address2 = "325 Broadway R/GML-1"
	attribute provider_1_address3 = "Boulder, CO 80305-3328"
	attribute provider_1_affiliation = "National Oceanic and Atmospheric Administration"
	attribute provider_1_country = "United  States"
	attribute provider_1_email = "Gabrielle.Petron@noaa.gov"
	attribute provider_1_name = "Gabrielle Petron"
	attribute provider_1_parameter = "Provider has contributed measurements for: h2"
	attribute provider_1_tel = "(720) 295-0145"
	attribute provider_total_listed = 1
	attribute site_code = "LEF"
	attribute site_country = "United States"
	attribute site_country_flag = "https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNST0001.GIF"
	attribute site_elevation = 472.0
	attribute site_elevation_unit = "masl"
	attribute site_latitude = 45.9451
	attribute site_longitude = -90.2732
	attribute site_name = "Park Falls, Wisconsin"
	attribute site_position_comment = "This is the nominal location of the site. The sampling location at many sites has changed over time, and we report here the most recent nominal location. The actual sampling location for each observation is not necessarily the site location. The sampling locations for each observation are reported in the latitude, longitude, and altitude variables."
	attribute site_utc2lst = -6.0
	attribute site_utc2lst_comment = "Add 'site_utc2lst' hours to convert a time stamp in UTC (Coordinated Universal Time) to LST (Local Standard Time)."
dataset /air_sample_container_id: string(1), shape (1061, 100)
	attribute comment = "ID of air sample container. See provider_comment if available."
	attribute long_name = "Air_Sample_Container_ID"
dataset /altitude: float32, shape (1061)
	attribute _FillValue = -999.999023
	attribute comment = "Altitude (in meters above sea level). See provider_comment if available."
	attribute long_name = "sample_altitude_in_meters_above_sea_level"
	attribute provider_comment = "Altitude for this dataset is the sum of surface elevation (masl) and sample intake height (magl)."
	attribute standard_name = "altitude"
	attribute units = "m"
dataset /analysis_datetime: string(1), shape (1061, 100)
	attribute comment = "Air sample measurement date and time in LT. See provider_comment if available."
	attribute long_name = "air_sample_measurement_date_and_time_in_LT"
dataset /assimilation_concerns: int32, shape (1061, 6)
	attribute comment = "Values in this array indicate if the given observation has the assimilation concern defined by each column. A value of 0 means that there is no concern or it is not known to exist, and a non-zero value means that this concern does exist. Data suitable for a global scale model in general will have a 0 in the time window, representivity, and variability columns of this variable. The implementation of this variable is still being developed."
	attribute long_name = "assimilation_concerns"
	attribute order = "time window, representivity, variability, under review, wdcgg-background, scale_conversion"
	attribute units = "NA"
dataset /calendar_components: float32, shape (6)
dataset /datetime: string(1), shape (1061, 100)
	attribute comment = "Air sample date and time in UTC ISO 8601 format. Time-averaged values are reported at the start of the averaging interval."
	attribute long_name = "air_sample_date_and_time_in_UTC"
dataset /dim_concerns: float32, shape (6)
dataset /elevation: float32, shape (1061)
	attribute _FillValue = -999.999023
	attribute comment = "Surface elevation in meters above sea level. See provider_comment if available."
	attribute long_name = "surface_elevation_in_meters_above_sea_level"
	attribute standard_name = "elevation"
	attribute units = "m"
dataset /event_number: string(1), shape (1061, 200)
	attribute comment = "Identifies each discrete air sample collected at some time and location with a unique sample event number.  The event number (reported as a string) can be used to relate measurements of different trace gases and isotopes from the same sample."
	attribute long_name = "Unique_Air_Sample_Event_Number"
dataset /instrument: string(1), shape (1061, 100)
	attribute comment = "Instrument ID used to detect atmospheric parameter. See provider_comment if available."
	attribute long_name = "instrument_ID_to_detect_atmospheric_parameter"
dataset /intake_height: float32, shape (1061)
	attribute _FillValue = -999.999023
	attribute comment = "Sample intake height in meters above ground level (magl). See provider_comment if available."
	attribute long_name = "sample_intake_height_in_meters_above_ground_level"
	attribute units = "m"
dataset /latitude: float32, shape (1061)
	attribute _FillValue = -999.999023
	attribute comment = "Latitude at which air sample was collected."
	attribute long_name = "sample_latitude_in_decimal_degrees"
	attribute standard_name = "latitude"
	attribute units = "degrees_north"
dataset /longitude: float32, shape (1061)
	attribute _FillValue = -999.999023
	attribute comment = "Longitude at which air sample was collected using a range of -180 degrees to +180 degrees."
	attribute long_name = "sample_longitude_in_decimal_degrees"
	attribute standard_name = "longitude"
	attribute units = "degrees_east"
dataset /method: string(1), shape (1061, 100)
	attribute comment = "Air sample collection method. See provider_comment if available."
	attribute long_name = "air_sample_collection_method"
	attribute provider_comment = "A single-character code is used to identify the sample collection method. The codes are: P - Sample collected using a portable, battery powered pumping unit. Two flasks are connected in series, flushed with air, and then pressurized to 1.2 - 1.5 times ambient pressure. D - Similar to P but the air passes through a condenser cooled to about 5 deg C to partially dry the sample. G - Similar to D but with a gold-plated condenser. T - Evacuated flask filled by opening an O-ring sealed stopcock. S - Flasks filled at NOAA GML observatories by sampling air from the in situ CO2 measurement air intake system. N - Before 1981, flasks filled using a hand-held aspirator bulb. After 1981, flasks filled using a pump different from those used in method P, D, or G. F - Five liter evacuated flasks filled by opening a ground glass, greased stopcock"
dataset /midpoint_time: int32, shape (1061)
	attribute comment = "POSIX midpoint time.  Number of seconds since January 1, 1970 in UTC."
	attribute long_name = "sample_midpoint_time_in_seconds_since_january_1_1970"
	attribute units = "seconds since 1970-01-01T00:00:00Z"
dataset /obs: float32, shape (0)
dataset /obs_flag: int32, shape (1061)
	attribute _FillValue = -9
	attribute comment = "Determined by data provider (1: large spatial scale representation; 0: local/regional influence).  The implementation of this flag is still being developed."
	attribute long_name = "obs_flag"
	attribute units = "binary"
dataset /obspack_id: string(1), shape (1061, 200)
	attribute comment = "ObsPack observation identification string.  Unique across ALL ObsPack data products.  Includes Obspack name, data set name, and ObsPack observation number delimited by a tilde (~)."
	attribute long_name = "unique_ObsPack_identification_string"
dataset /obspack_num: int32, shape (1061)
	attribute comment = "Unique observation index number across all data sets in the ObsPack data product. Range is from 1 to max_obspack_num"
	attribute long_name = "unique_ObsPack_observation_number"
dataset /qcflag: string(1), shape (1061, 10)
	attribute comment = "This quality control flag is provided by the contributing PIs. See provider_comment if available."
	attribute long_name = "quality_control_flag"
	attribute provider_comment = "This is the NOAA 3-character quality control flag.  Column 1 is the REJECTION flag. An alphanumeric other than a period (.) in the FIRST column indicates a sample with obvious problems during collection or analysis. This measurement should not be interpreted. Column 2 is the SELECTION flag. An alphanumeric other than a period (.) in the SECOND column indicates a sample that is likely valid but does not meet selection criteria determined by the goals of a particular investigation. For example, it might not have been obtained during 'background' conditions.  Column 3 is the INFORMATION flag. An alphanumeric other than a period (.) in the THIRD column provides additional information about the collection or analysis of the sample. A P in the 3rd column of the QC flag indicates the measurement result is preliminary and has not yet been carefully examined by the PI.  The P flag is removed once the quality of the measurement has been determined."
dataset /solartime_components: int32, shape (1061, 6)
	attribute _FillValue = -9
	attribute comment = "Calendar local solar time components as integers. UTC time is converted to local solar time based on longitude and day-of-year. Time-averaged values are reported at the start of the averaging interval."
	attribute long_name = "integer_components_of_local_solar_date/time"
	attribute order = "year, month, day, hour, minute, second"
dataset /start_time: int32, shape (1061)
	attribute comment = "POSIX start time.  Number of seconds since January 1, 1970 in UTC."
	attribute long_name = "sample_start_time_in_seconds_since_january_1_1970"
	attribute units = "seconds since 1970-01-01T00:00:00Z"
dataset /string_of_100chars: float32, shape (100)
dataset /string_of_10chars: float32, shape (10)
dataset /string_of_200chars: float32, shape (200)
dataset /time: int32, shape (1061)
	attribute comment = "POSIX time.  Number of seconds since January 1, 1970 in UTC. Time-averaged values are reported at the start of the averaging interval."
	attribute long_name = "sample_time_in_seconds_since_january_1_1970"
	attribute units = "seconds since 1970-01-01T00:00:00Z"
dataset /time_components: int32, shape (1061, 6)
	attribute _FillValue = -9
	attribute comment = "Calendar time components as integers. Times and dates are UTC. Time-averaged values are reported at the start of the averaging interval."
	attribute long_name = "integer_components_of_UTC_date/time"
	attribute order = "year, month, day, hour, minute, second"
dataset /time_decimal: float64, shape (1061)
	attribute _FillValue = -999.999
	attribute comment = "decimal year in UTC. Time-averaged values are reported at the start of the averaging interval."
	attribute long_name = "sample_decimal_year_in_UTC"
dataset /unique_sample_location_num: int32, shape (1061)
	attribute comment = "This variable uniquely identifies a sample location and datetime. The number assigned to each observation in this variable will be the same in all future ObsPack products including ones for other species measured in that sample."
	attribute long_name = "unique_sample_location_num"
dataset /value: float32, shape (1061)
	attribute _FillValue = -999.999023
	attribute comment = "Mole fraction reported in units of nanomol mol-1 (10-9 mol per mol of dry air); abbreviated as ppb (parts per billion)."
	attribute long_name = "measured_mole_fraction_of_trace_gas_in_dry_air"
	attribute scale_comment = "H2_X2009"
	attribute units = "nanomol mol-1"
dataset /value_unc: float32, shape (1061)
	attribute _FillValue = -999.999023
	attribute comment = "This is the estimated uncertainty of the reported value. See provider_comment if available."
	attribute long_name = "estimated_uncertainty_in_reported_value"
	attribute units = "nanomol mol-1"