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 Organization

NO 17
Acronym DMC
Name Direccion Meteorologica de Chile
Address 1
Address 2 Dirección Meteorológica de Chile
Address 3 Av. Portales 3450, Estación Central - Santiago
Country/Territory Chile
Website http://www.meteochile.gob.cl/

 Contact(s)

Name Gaston Torres
Prefix
Email gtorres@meteochile.cl
Organization No 17
Organization acronym DMC
Organization name Direccion Meteorologica de Chile
Organization country/territory Chile
Address 1
Address 2
Address 3
Country/territory Chile
Tel
Fax
Last updated date 2023-08-15


Name Martin Steinbacher
Prefix Dr.
Email martin.steinbacher@empa.ch
Organization No 23
Organization acronym Empa
Organization name Swiss Federal Laboratories for Materials Science and Technology
Organization country/territory Switzerland
Address 1 Ueberlandstrasse 129
Address 2 CH-8600 Duebendorf
Address 3 Switzerland
Country/territory Switzerland
Tel +41 58 765 4048
Fax
Last updated date 2023-08-22


NO 23
Acronym Empa
Name Swiss Federal Laboratories for Materials Science and Technology
 Background observation
 UTC
 ppb
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CO X2014A
 2012-12-31 00:00:00 - 9999-12-31 23:59:59: Picarro Inc., G2401, S/N CFKADS2031(CRDS)
 2012-12-31 00:00:00 - 9999-12-31 23:59:59: 5 (m)
 1 second
 Four calibration tanks are measured automatically every 2 to 9 days. Three of them are tanks purchased from the GAW Central Calibration Laboratory (NOAA ESRL), the mole fractions of the fourth tank are determined by the GAW World Calibration Centre for CH4, CO2, CO and surface O3 (WCC-Empa). WCC-Empa also assigned the mole fractions of an additional target cylinder that is measured every second day for quality control.
Assigned mole fractions for the years 2013-2019 were initially reported on the WMO CO X2004 scale. In July 2021, all data were reprocessed and (re-)submitted and, since then, the whole time series is traceable to the WMO CO X2014A scale. Data 2020 and onwards were directly processed using the X2014A assignments of the reference gases, earlier data were converted using the equation CO_X2014A = 1.0237698 * CO_X2004 + -3.7039190. Parameters were retrieved based on the assignments of the GAW Central Calibration Laboratory for CO (NOAA GML) reported on the X2004 and the X2014A scales. Data 2020 and onwards were processed with updated nominal CO mole fractions traceable to WMO X2014A. The quality of the calibration is verified with a fifth reference gas (target cylinder).
 Quality assurance procedures involve time series plots, target tank (i.e. cylinders containing natural air with assigned trace gas mole fractions that are treated as (unknown) sample in a sequence of analyses) measurements, and consistency checks.
 [Hourly] high-resolution data are aggregated to 1min averages before hourly averages are calculated. Thus, ND (the number of detections) refers to the number of available 1min averages within the respective hour. Minimum requirement is availability of 20 1-min data within one hour.
 [Daily] hourly averages are aggregated to daily means. Thus, ND (the number of detections) refers to the number of available hourly averages within the respective day. Minimum requirement is availability of 8 hourly averages within on day.
 [Monthly] daily data are aggregated to monthly means. Thus, ND (the number of detections) refers to the number of available daily averages within the respective month. Minimum requirement is availability of 10 daily averages within one month.
 
 Valid: 2
 Operational/Reporting
 Scientific Aim : long-term trend of background mole fractions in South America
Sampling Environment : El Tololo is a background station in a pristine arid environment. Local emissions are rare and vegetation is sparse.
data are continuously recorded with approximately 1 Hz sampling rate.
CO2 observations are performed with a commercially available instrument (Picarro Inc. G2401) based on the Wavelength-Scanned Cavity Ringdown Spectroscopy technique coupled to a custom-built calibration unit. Along with CO2, the instrument is also capable to measure CH4, CO and H2O. Thus, the CO2 data can be corrected for interferences of water vapor. Thus, no drying is applied prior to analysis and CO2 dry air mole fractions are determined by application of an empirical humidity correction to the fully unaltered humid gas stream accounting for dilution and pressure broadening effects. The humidity correction function is determined on-site approximately twice a year.
tubing material: Dekabon/Synflex 1/4"" OD; total inlet length approx. 10m; flow rate into lab: 5 lpm.
 Wind direction:
 Wind speed:
 Relative humidity:
 Precipitation amount:
 Air pressure:
 Air temperature:
 Dew point temperature:
 Sea water temperature:
 Sea surface water temperature:
 Sea water salinity:
 Sea surface water salinity:
Meteorological data may remain as first provided, even when greenhouse gas data are updated.
 

 DOI Metadata

DOI
co_tll_surface-insitu_17_9999-9999_hourly.nc 10.50849/WDCGG_0017-3005-3001-01-01-9999
co_tll_surface-insitu_17_9999-9999_hourly.txt 10.50849/WDCGG_0017-3005-3001-01-01-9999
co_tll_surface-insitu_17_9999-9999_daily.nc 10.50849/WDCGG_0017-3005-3001-01-01-9999
co_tll_surface-insitu_17_9999-9999_daily.txt 10.50849/WDCGG_0017-3005-3001-01-01-9999
co_tll_surface-insitu_17_9999-9999_monthly.nc 10.50849/WDCGG_0017-3005-3001-01-01-9999
co_tll_surface-insitu_17_9999-9999_monthly.txt 10.50849/WDCGG_0017-3005-3001-01-01-9999
Version 2023-08-15-1530 (Data Version History)
* DOIs and file names may have multiple versions. Be sure to check the data version.
Title Atmospheric CO at El Tololo by Direccion Meteorologica de Chile, dataset published as CO_TLL_surface-insitu_DMC_data1 at WDCGG
Creator Direccion Meteorologica de Chile
Gaston Torres (Empa)
Martin Steinbacher (Empa)
Publisher World Data Centre for Greenhouse Gases
Publication Date 2018-06-19 (Last Updated: 2023-08-16)
Format Text (WDCGG Data Format Table, WDCGG Meteorological Data Format Table), NetCDF
Relation List (Is Part Of) All CO data contributed to WDCGG by GAW stations and mobiles by 2023-09-13
All CO data contributed to WDCGG by GAW stations and mobiles by 2022-09-05
All CO data contributed to WDCGG by GAW stations and mobiles by 2021-08-27
All CO data contributed to WDCGG by GAW stations and mobiles by 2020-09-28
All CO data contributed to WDCGG by GAW stations and mobiles by 2019-09-19
All CO data contributed to WDCGG by GAW stations and mobiles by 2018-10-25
Geolocation Point
Latitude (north: +; south: -) -30.16833
Longitude (east: +; west: -) -70.80361

 GAW Data Policy

"For Scientific purposes, access to these data is unlimited and provided without charge. By their use you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."

 Citation format

This format is an example of the WDCGG standard citation.
Please follow the citation format which the data providers or owners indicate.
Gaston Torres (DMC), Martin Steinbacher (Empa), Atmospheric CO at El Tololo by Direccion Meteorologica de Chile , dataset published as CO_TLL_ surface-insitu_DMC_data1 at WDCGG, ver. 2023-08-15-1530, https://doi.org/10.50849/WDCGG_0017-3005-3001-01-01-9999 (Reference date*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.

 Reference(s)

1  Installation and operation were supported by the Federal Office of Meteorology and Climatology MeteoSwiss through the project Capacity Building and Twinning for Climate Observing Systems (CATCOS) between the Swiss Agency for Development and Cooperation (SDC) and MeteoSwiss. Since the end of the CATCOS programme in March 2017 and minor follow-up support through the GCOS Trust Fund until March 2021, Swiss support is mainly ensured through the Quality Assurance / Science Activity Centre Switzerland (QA/SAC-CH), supported by MeteoSwiss and run by Empa.