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ERDDAP
Easier access to scientific data |
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Brought to you by NOAA NMFS SWFSC ERD |
| Dataset Title: | Atmospheric trace gas measurements: Co2C14 Pfp Surface
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| Institution: | NOAA Global Monitoring Laboratory (Dataset ID: co2c14_pfp_surface) |
| Range: | longitude = -121.6861 to -81.8334°E, latitude = 31.3149 to 45.9451°N, altitude = 91.1 to 2742.3m, time = 2009-02-24T09:38:34Z to 2016-12-31T20:42:29Z |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
| Data Access Form
| Files
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![[The graph you specified. Please be patient.]](https://erddap.gml.noaa.gov/erddap/tabledap/co2c14_pfp_surface.png?longitude,latitude,obs&time%3E=2016-12-25T00%3A00%3A00Z&time%3C=2017-01-01T00%3A00%3A00Z&.draw=markers&.marker=5%7C5&.color=0x000000&.colorBar=%7C%7C%7C%7C%7C&.bgColor=0xffccccff)
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Attributes {
s {
obs {
Int16 _FillValue 32767;
String ioos_category "Unknown";
String long_name "Obs";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.235468314e+9, 1.483216949e+9;
String axis "T";
String comment "POSIX time. Number of seconds since January 1, 1970 in UTC. Time-averaged values are reported at the start of the averaging interval.";
String ioos_category "Time";
String long_name "Sample Time In Seconds Since January 1 1970";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
start_time {
Float64 actual_range 1.235468314e+9, 1.483216949e+9;
String comment "POSIX start time. Number of seconds since January 1, 1970 in UTC.";
String ioos_category "Time";
String long_name "Sample Start Time In Seconds Since January 1 1970";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
midpoint_time {
Float64 actual_range 1.235468314e+9, 1.483216949e+9;
String comment "POSIX midpoint time. Number of seconds since January 1, 1970 in UTC.";
String ioos_category "Time";
String long_name "Sample Midpoint Time In Seconds Since January 1 1970";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
datetime {
String comment "Air sample date and time in UTC ISO 8601 format. Time-averaged values are reported at the start of the averaging interval.";
String ioos_category "Time";
String long_name "air_sample_date_and_time_in_UTC";
}
time_decimal {
Float64 _FillValue -999.999;
Float64 actual_range 2009.1490459791983, 2016.9996252340113;
String comment "decimal year in UTC. Time-averaged values are reported at the start of the averaging interval.";
String ioos_category "Time";
String long_name "sample_decimal_year_in_UTC";
}
value {
Float32 _FillValue -999.999;
Float32 actual_range -145.72, 67.69;
String comment "Isotope ratios are reported as delta values where d14C = [(14C/12Csample/(14C/12Cstandard)-1] x 1000. Delta values are reported in units of per mil.";
String ioos_category "Unknown";
String long_name "measured_isotopic_ratio_of_14C/12C_(CO2)_in_air";
String scale_comment "curl_co2c14";
String units "per mil";
}
value_unc {
Float32 _FillValue -999.999;
Float32 actual_range 1.0, 2.86;
String comment "This is the estimated uncertainty of the reported value. See provider_comment if available.";
String ioos_category "Quality";
String long_name "Estimated Uncertainty In Reported Value";
String units "per mil";
}
latitude {
String _CoordinateAxisType "Lat";
Float32 _FillValue -999.999;
Float32 actual_range 31.3149, 45.9451;
String axis "Y";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String comment "Latitude at which air sample was collected.";
String ioos_category "Location";
String long_name "Sample Latitude In Decimal Degrees";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float32 _FillValue -999.999;
Float32 actual_range -121.6861, -81.8334;
String axis "X";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String comment "Longitude at which air sample was collected using a range of -180 degrees to +180 degrees.";
String ioos_category "Location";
String long_name "Sample Longitude In Decimal Degrees";
String standard_name "longitude";
String units "degrees_east";
}
altitude {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "up";
Float32 _FillValue -999.999;
Float32 actual_range 91.1, 2742.3;
String axis "Z";
String comment "Altitude (in meters above sea level). See provider_comment if available.";
String ioos_category "Location";
String long_name "Sample Altitude In Meters Above Sea Level";
String positive "up";
String provider_comment "Altitude for this dataset is the sum of surface elevation (masl) and sample intake height (magl).";
String standard_name "altitude";
String units "m";
}
elevation {
Float32 _FillValue -999.999;
Float32 actual_range 2.0, 2731.0;
String comment "Surface elevation in meters above sea level. See provider_comment if available.";
String ioos_category "Location";
String long_name "Surface Elevation In Meters Above Sea Level";
String standard_name "altitude";
String units "m";
}
intake_height {
Float32 _FillValue -999.999;
Float32 actual_range 11.3, 484.0;
String comment "Sample intake height in meters above ground level (magl). See provider_comment if available.";
String ioos_category "Location";
String long_name "Sample Intake Height In Meters Above Ground Level";
String units "m";
}
qcflag {
String comment "This quality control flag is provided by the contributing PIs. See provider_comment if available.";
String ioos_category "Quality";
String long_name "Quality Control Flag";
String 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.";
}
instrument {
String comment "Instrument ID used to detect atmospheric parameter. See provider_comment if available.";
String ioos_category "Identifier";
String long_name "instrument_ID_to_detect_atmospheric_parameter";
}
analysis_datetime {
String comment "Air sample measurement date and time in LT. See provider_comment if available.";
String ioos_category "Time";
String long_name "air_sample_measurement_date_and_time_in_LT";
}
method {
String comment "Air sample collection method. See provider_comment if available.";
String ioos_category "Unknown";
String long_name "Air Sample Collection Method";
String provider_comment "A single-character code is used to identify the sample collection method. The codes are: A - The automated or manual filling of a whole air sample using the Programmable Flask Package (PFP) and Programmable Compressor Package (PCP)air sampling devices. The air sample is contained in a 0.7 liter borosilicate glass container (flask) fitted with two Glass Expansion high vacuum glass piston valves sealed with PTFE O-rings. The flasks are typically flushed with 10 liters (aircraft samples) or 75 liters (tower samples) of ambient air and then pressurized to 40 psia. Air is delivered through an intake tube using two diaphragm pumps connected in series and controlled with a microprocessor. The flow rate is approximately 15 L/min at sea level. See Sweeney et al. 2015 and Andrews et al. 2014 for more details. C - Air samples are collected as with method 'A', but the sample air is dried before sample collection. Flasks are not pre-filled with ambient air before flushing and collecting the air sample. I - Air is sampled from a 15L spherical stainless steel mixing volume after being filled with ambient air that was pulled through an M&C Techgroup Model ECP 20-2 gas chiller using an integrating compressor and mass flow controller. The two stainless steel dryer traps are plumbed in series, held at approximately 5 degrees C and the condensed water is removed with a peristaltic pump. Prior to sample collection, an additional glass conditioning step known as \"prefilling\" occurs where the glass containers are flushed and filled with ambient air and then vented and flushed immediately before air sample collection. This is a glass conditioning step that addresses glass wall effects of the gases of interest. After 'prefilling', the integration starts with a high flow rate of 3.8 SLM and decreases over time to 0.29 SLM over 1 hour. The resulting one hour time averaged ambient air sample is compressed into a 0.75 liter borosilicate glass container (flask) fitted with 2 Glass Expansion high vacuum glass valves and PTFE O-rings. The flask is typically filled to 40 psia. (See Turnbull, J.C., Guenther, D., Karion, A., Sweeney, C., Anderson, E., Andrews, A.E., Kofler, J., Miles, N.L., Newberger, T., Richardson, S.J., Tans, P.P., 2012. An integrated flask sample collection system for greenhouse gas measurements. Atmos. Meas. Tech. 5, 2321-2327.) B - Air samples are collected as with method 'R', but with an additional drying step using one of several techniques. In one method, e.g. site=ACT, air samples were dried with a two-stage chiller cooled to 5 degrees C; those taken below 3000 m MSL were also pressurized to 40 psia to further facilitate air sample drying (Baier et al. 2019). At tower sampling sites, M&C chillers with temperatures set to approximately 3 degrees C and sub-ambient pressure due to high flow are used (Andrew et al. 2014). At CRV tower, a two-stage chiller set to -26 degrees C is used. R - Air samples are collected as with method 'A', but with an additional glass conditioning step known as \"prefilling\". During prefilling, the glass containers are flushed and filled with ambient air and then vented and flushed immediately before air sample collection. This is a glass conditioning step that addresses glass wall effects of the gasses of interest (Andrews et al. 2014). X - Testing method for pfp drying experiments. CP-> chiller pressurized";
}
event_number {
String 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.";
String ioos_category "Statistics";
String long_name "Unique_Air_Sample_Event_Number";
}
air_sample_container_id {
String comment "ID of air sample container. See provider_comment if available.";
String ioos_category "Identifier";
String long_name "Air_Sample_Container_ID";
}
unique_sample_location_num {
Int32 _FillValue 2147483647;
Int32 actual_range 1284363, 103700574;
String 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.";
String ioos_category "Location";
String long_name "Unique Sample Location Num";
}
site_code {
String cf_role "timeseries_id";
String ioos_category "Identifier";
String long_name "Site Code";
}
site_name {
String ioos_category "Identifier";
String long_name "Site Name";
}
site_utc2lst {
String ioos_category "Other";
String long_name "Site UTC to LST Offset";
}
dataset_parameter {
String ioos_category "Identifier";
String long_name "Dataset Parameter";
}
}
NC_GLOBAL {
String cdm_data_type "TimeSeries";
String cdm_timeseries_variables "site_code";
String Conventions "COARDS, CF-1.10, ACDD-1.3";
String dataset_calibration_scale "curl_co2c14";
String dataset_citation "J.B. Miller, M. Dyonisius, C. Wolak, P. Cappa, S. Morgan, J. Kofler, P. Handley, A. Andrews, J. Higgs, E. Moglia, and S.J. Lehman (2025), NOAA Global Monitoring Laboratory and University of Colorado, Institute of Alpine and Arctic Research(INSTAAR). NOAA GML Global Greenhouse Gas Reference Network Flask-Air PFP Sample Measurements of the Radiocarbon Composition of Atmospheric Carbon Dioxide(Delta(14CO2))at Tall Tower and other North American continental sites, 2009-2016 [Data set]. NOAA GML. https://doi.org/10.15138/9R46-MR76 Version: 2025-03-07";
String dataset_comment "For more information about these data, please see https://gml.noaa.gov/aftp/data/trace_gases/co2c14/pfp/README_co2c14_surface-pfp_curl.html";
String dataset_creation_date "2025-03-07T16:04:21.393348";
String dataset_description "Radiocarbon Composition of Atmospheric Carbon Dioxide (Delta-14CO2) from the NOAA GML Carbon Cycle Surface PFP Sampling Network, 2009-2020.";
String 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. To ensure that GML receives fair credit for their work please include relevant citation text in publications. We encourage users to contact the data providers, who can provide detailed information about the measurements and scientific insight. In cases where the data are central to a publication, coauthorship for data providers may be appropriate.";
String dataset_num "1";
String dataset_parameter "co2c14";
String dataset_parameter_industrial_name "Carbon-14/Carbon in Carbon Dioxide";
String dataset_parameter_name "Carbon-14/Carbon in Carbon Dioxide";
String dataset_platform "fixed";
String dataset_project "surface-pfp";
String dataset_provider_license "These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0).";
String dataset_reference_total_listed "0";
String dataset_selection "event";
String dataset_selection_tag "event";
String dataset_start_date "2009-06-27T19:28:11Z";
String dataset_stop_date "2011-12-25T21:20:43Z";
String dataset_usage_description "Please cite the product's citation when using data from this dataset.";
String 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.";
Float64 Easternmost_Easting -81.8334;
String featureType "TimeSeries";
Float64 geospatial_lat_max 45.9451;
Float64 geospatial_lat_min 31.3149;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -81.8334;
Float64 geospatial_lon_min -121.6861;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 2742.3;
Float64 geospatial_vertical_min 91.1;
String geospatial_vertical_positive "up";
String geospatial_vertical_units "m";
String history
"2026-05-15T12:20:20Z (local files)
2026-05-15T12:20:20Z https://erddap.gml.noaa.gov/tabledap/co2c14_pfp_surface.das";
String infoUrl "https://gml.noaa.gov/aftp/data/trace_gases/co2c14/pfp/surface/nc/README_co2c14_surface-pfp_curl.html";
String institution "NOAA Global Monitoring Laboratory";
String keywords "Earth Science > Atmosphere > Trace Gases > Co2C14";
String keywords_vocabulary "GCMD Science Keywords";
String lab_1_abbr "INSTAAR-CURL";
String lab_1_address1 "University of Colorado, Institute of Arctic and Alpine Research";
String lab_1_address2 "1560 30th Street";
String lab_1_address3 "Boulder, CO 80303";
String lab_1_country "United States";
String lab_1_country_flag "https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNST0001.GIF";
String lab_1_logo "https://gml.noaa.gov/webdata/ccgg/ObsPack/images/logos/";
String lab_1_name "INSTAAR Radiocarbon Laboratory";
String lab_1_number "376";
String lab_1_ongoing_atmospheric_air_comparison "T";
String lab_1_parameter "Lab has contributed measurements for: co2c14";
String lab_total_listed "2";
String license
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
Float64 Northernmost_Northing 45.9451;
String partner_1_logo "https://gml.noaa.gov/webdata/ccgg/ObsPack/images/logos/uci_medium.png";
String provider_1_address1 "NOAA GML";
String provider_1_address2 "325 Broadway R/GML-1";
String provider_1_address3 "Boulder, CO 80305-3328";
String provider_1_affiliation "National Oceanic and Atmospheric Administration";
String provider_1_country "United States";
String provider_1_email "john.b.miller@noaa.gov";
String provider_1_name "John B. Miller";
String provider_1_parameter "Provider has contributed measurements for: co2c14";
String provider_1_tel "1 303 497 7739";
String provider_total_listed "2";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 31.3149;
String standard_name_vocabulary "CF Standard Name Table v70";
String subsetVariables "site_code, dataset_parameter";
String summary "Radiocarbon Composition of Atmospheric Carbon Dioxide (Delta-14CO2) from the NOAA GML Carbon Cycle Surface PFP Sampling Network, 2009-2020.";
String time_coverage_end "2016-12-31T20:42:29Z";
String time_coverage_start "2009-02-24T09:38:34Z";
String title "Atmospheric trace gas measurements: Co2C14 Pfp Surface";
String topic_category "environment";
Float64 Westernmost_Easting -121.6861;
String wis2_topic_hierarchy "origin/a/wis2/noaa-gml/data/core/weather/surface-based-observations/co2c14";
}
}
Data Access Protocol (DAP) and its
selection constraints.
The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.
Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names,
followed by a collection of
constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.