# header_lines : 165 # # ------------------------------------------------------------->>>> # DATA SET NAME # # dataset_name: CHCl3_hfm_surface-pfp_97_hats_event # # ------------------------------------------------------------->>>> # DESCRIPTION # # dataset_description: Atmospheric Dry Air Mole Fractions of CHCl3 from the NOAA GML Surface and Aircraft Vertical Profile Network. All data in this file is PRELIMINARY. # # ------------------------------------------------------------->>>> # CITATION # # dataset_citation: Vimont, I., Montzka, S., Crotwell, M., Andrews, A., Baier, B., Hall, B., Handley, P., Higgs, J., Kofler, J., Legard, T., McKain, K., Miller, J., Moglia, E., Mund, J., Neff, D., Newberger, T., Petron, G., Sweeney, C., Turnbull, J., Wolter, S., & NOAA Global Monitoring Laboratory. (2022). Atmospheric Dry Air Mole Fractions of CHCl3 from the NOAA GML Surface and Aircraft Vertical Profile Network. [Data set]. NOAA GML. Version 2023-05-16. https://doi.org/10.15138/adas-g698 # # ------------------------------------------------------------->>>> # FAIR USE POLICY # # 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. # # ------------------------------------------------------------->>>> # WARNING # # 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. # # ------------------------------------------------------------->>>> # GLOBAL ATTRIBUTES # # site_code : HFM # site_name : Harvard Forest, Massachusetts # site_country : United States # site_country_flag : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNST0001.GIF # site_latitude : 42.5378 # site_longitude : -72.1714 # site_elevation : 340.0 # site_elevation_unit : masl # 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. # site_utc2lst : -5.0 # site_utc2lst_comment : Add 'site_utc2lst' hours to convert a time stamp in UTC (Coordinated Universal Time) to LST (Local Standard Time). # dataset_creation_date : 2023-05-16T09:43:27.400015 # dataset_num : 74 # dataset_name : CHCl3_hfm_surface-pfp_97_hats_event # dataset_parameter : CHCl3 # dataset_parameter_name : Chloroform # dataset_parameter_IUPAC_name : Trichloromethane # dataset_parameter_industrial_name : Chloroform # dataset_parameer_chemical_name : CHCl3 # dataset_parameter_sources : Solvent, Feedstock, anesthetic, seaweed # dataset_project : surface-pfp # dataset_platform : fixed # dataset_selection : event # dataset_selection_tag : event # dataset_comment : Site is a short (eddy covariance) tower in a forest with likely small representativeness/very strong influence of photosynthesis and respiration signals. # dataset_calibration_scale : NOAA-2003-PR1 # dataset_start_date : 2016-03-02T16:59:10Z # dataset_stop_date : 2016-08-07T16:13:13Z # 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. # dataset_usage_description : Please cite the product's citation when using data from this dataset. # dataset_reference_total_listed : 0 # dataset_contribution : These data are provided by NOAA-HATS AND NOAA. Principal investigators include Isaac Vimont (NOAA) AND Kathryn McKain (NOAA). # lab_total_listed : 2 # lab_1_number : 97 # lab_1_abbr : NOAA-HATS # lab_1_name : NOAA GML Halocarbons and Other Atmospheric Trace Species # lab_1_address1 : National Oceanic and Atmospheric Administration (NOAA), Global Monitoring Laboratory (GML) # lab_1_address2 : 325 Broadway, R/GML1 # lab_1_address3 : Boulder, CO 80305-3328 # lab_1_country : United States # lab_1_url : http://gml.noaa.gov/hats/ # lab_1_parameter : Lab has contributed measurements for: CHCl3 # lab_1_country_flag : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNST0001.GIF # lab_1_logo : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/logos/noaa_medium.png # lab_1_ongoing_atmospheric_air_comparison : T # lab_2_number : 1 # lab_2_abbr : NOAA # lab_2_name : NOAA Global Monitoring Laboratory # lab_2_address1 : 325 Broadway # lab_2_address2 : NOAA R/GML-1 # lab_2_address3 : Boulder, CO 80305-3328 # lab_2_country : United States # lab_2_url : https://gml.noaa.gov/ccgg/ # lab_2_parameter : Lab has contributed measurements for: CHCl3 # lab_2_country_flag : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNST0001.GIF # lab_2_logo : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/logos/noaa_medium.png # provider_total_listed : 2 # provider_1_name : Isaac Vimont # provider_1_address1 : NOAA GML # provider_1_address2 : 325 Broadway R/GML-1 # provider_1_address3 : Boulder, CO 80305-3328 # provider_1_country : United States # provider_1_affiliation : National Oceanic and Atmospheric Administration # provider_1_email : isaac.vimont@noaa.gov # provider_1_parameter : Provider has contributed measurements for: CHCl3 # provider_2_name : Kathryn McKain # provider_2_address1 : NOAA GML # provider_2_address2 : 325 Broadway R/GML-1 # provider_2_address3 : Boulder, CO 80305-3328 # provider_2_country : United States # provider_2_affiliation : National Oceanic and Atmospheric Administration # provider_2_email : kathryn.mckain@noaa.gov # provider_2_tel : 303-497-6229 # provider_2_parameter : Provider has contributed measurements for: CHCl3 # ------------------------------------------------------------->>>> # VARIABLE ATTRIBUTES # # site_code:long_name : site_name_abbreviation. # site_code:comment : Site code is an abbreviation for the sampling site name. # time_components:_FillValue : -9 # time_components:long_name : integer_components_of_UTC_date/time # time_components:order : year, month, day, hour, minute, second # time_components:comment : Calendar time components as integers. Times and dates are UTC. Time-averaged values are reported at the start of the averaging interval. # datetime:long_name : air_sample_date_and_time_in_UTC # datetime:comment : Air sample date and time in UTC ISO 8601 format. Time-averaged values are reported at the start of the averaging interval. # time_decimal:_FillValue : -999.999 # time_decimal:long_name : sample_decimal_year_in_UTC # time_decimal:comment : decimal year in UTC. Time-averaged values are reported at the start of the averaging interval. # air_sample_container_id:long_name : Air_Sample_Container_ID # air_sample_container_id:comment : ID of air sample container. See provider_comment if available. # value:_FillValue : -999.999 # value:long_name : 10^-12 mol per mol # value:units : pmol mol-1 # value:scale_comment : NOAA-2003-PR1 # latitude:_FillValue : -999.999 # latitude:standard_name : latitude # latitude:long_name : sample_latitude_in_decimal_degrees # latitude:units : degrees_north # latitude:comment : Latitude at which air sample was collected. # longitude:_FillValue : -999.999 # longitude:standard_name : longitude # longitude:long_name : sample_longitude_in_decimal_degrees # longitude:units : degrees_east # longitude:comment : Longitude at which air sample was collected using a range of -180 degrees to +180 degrees. # altitude:_FillValue : -999.999 # altitude:standard_name : altitude # altitude:long_name : sample_altitude_in_meters_above_sea_level # altitude:units : m # altitude:comment : Altitude (in meters above sea level). See provider_comment if available. # altitude:provider_comment : Altitude for this dataset is the sum of surface elevation (masl) and sample intake height (magl). # elevation:_FillValue : -999.999 # elevation:standard_name : elevation # elevation:long_name : surface_elevation_in_meters_above_sea_level # elevation:units : m # elevation:comment : Surface elevation in meters above sea level. See provider_comment if available. # intake_height:_FillValue : -999.999 # intake_height:long_name : sample_intake_height_in_meters_above_ground_level # intake_height:units : m # intake_height:comment : Sample intake height in meters above ground level (magl). See provider_comment if available. # method:long_name : air_sample_collection_method # method:comment : Air sample collection method. See provider_comment if available. # method: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. 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. 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. 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.) 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). # event_number:long_name : Unique_Air_Sample_Event_Number # event_number: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. # instrument:long_name : instrument_ID_to_detect_atmospheric_parameter # instrument:comment : Instrument ID used to detect atmospheric parameter. See provider_comment if available. # analysis_datetime:long_name : air_sample_measurement_date_and_time_in_LT # analysis_datetime:comment : Air sample measurement date and time in LT. See provider_comment if available. # qcflag:long_name : quality_control_flag # qcflag:comment : This quality control flag is provided by the contributing PIs. See provider_comment if available. # qcflag: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. # # VARIABLE ORDER # site_code year month day hour minute second datetime time_decimal air_sample_container_id value latitude longitude altitude elevation intake_height method event_number instrument analysis_datetime qcflag HFM 2016 3 2 16 59 10 2016-03-02T16:59:10Z 2016.1686004224853 3058-01 16.56 42.5378 -72.1714 369.0 340.0 29.0 R 404759 PR1 2016-04-12T20:00:00 ..P HFM 2016 3 3 15 0 57 2016-03-03T15:00:57Z 2016.1711083598968 3058-03 16.352 42.5378 -72.1714 369.0 340.0 29.0 R 404761 PR1 2016-04-12T20:44:00 ..P HFM 2016 3 17 17 5 2 2016-03-17T17:05:02Z 2016.2095951603926 3058-05 17.006 42.5378 -72.1714 369.0 340.0 29.0 R 404763 PR1 2016-04-12T21:06:00 ..P HFM 2016 3 18 15 2 10 2016-03-18T15:02:10Z 2016.2120942749443 3058-07 16.783 42.5378 -72.1714 369.0 340.0 29.0 R 404765 PR1 2016-04-12T21:28:00 ..P HFM 2016 3 18 17 32 43 2016-03-18T17:32:43Z 2016.2123799268873 3058-09 16.456 42.5378 -72.1714 369.0 340.0 29.0 R 404767 PR1 2016-04-12T21:50:00 ..P HFM 2016 3 22 15 32 58 2016-03-22T15:32:58Z 2016.2230816762801 3058-11 16.148 42.5378 -72.1714 369.0 340.0 29.0 R 404769 PR1 2016-04-12T22:34:00 ..P HFM 2016 7 21 16 16 20 2016-07-21T16:16:20Z 2016.553765052621 3747-01 17.531 42.5378 -72.1714 369.0 340.0 29.0 R 412101 PR1 2016-08-13T22:10:00 ..P HFM 2016 7 23 16 3 34 2016-07-23T16:03:34Z 2016.55920531016 3747-03 15.756 42.5378 -72.1714 369.0 340.0 29.0 R 412103 PR1 2016-08-13T22:32:00 ..P HFM 2016 7 26 15 1 2 2016-07-26T15:01:02Z 2016.5672833814006 3747-05 15.283 42.5378 -72.1714 369.0 340.0 29.0 R 412105 PR1 2016-08-13T23:16:00 ..P HFM 2016 7 26 17 6 13 2016-07-26T17:06:13Z 2016.5675209029043 3747-07 15.429 42.5378 -72.1714 369.0 340.0 29.0 R 412107 PR1 2016-08-13T23:38:00 ..P HFM 2016 7 28 15 5 20 2016-07-28T15:05:20Z 2016.5727560210485 3747-09 18.143 42.5378 -72.1714 369.0 340.0 29.0 R 412109 PR1 2016-08-14T00:00:00 ..P HFM 2016 8 7 16 13 13 2016-08-07T16:13:13Z 2016.600207226523 3747-11 16.157 42.5378 -72.1714 369.0 340.0 29.0 R 412111 PR1 2016-08-14T00:22:00 ..P