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NO 25
Acronym FMI
Name Finnish Meteorological Institute
Address 1
Address 2
Address 3 P.O. BOX 503 FI-00101 HELSINKI FINLAND
Country/Territory Finland
Website http://www.fmi.fi/en


Name Viktor Ivakhov
Email ivakhooo@mail.ru
Organization No 46
Organization acronym MGO
Organization name Voeikov Main Geophysical Observatory
Organization country/territory Russian Federation
Address 1
Address 2
Address 3
Country/territory Russian Federation
Last updated date 2020-07-29

Name Tuomas Laurila
Email tuomas.laurila@fmi.fi
Organization No 25
Organization acronym FMI
Organization name Finnish Meteorological Institute
Organization country/territory Finland
Address 1
Address 2
Address 3
Country/territory Finland
Last updated date 2020-07-29

Name Ed Dlugokencky
Email ed.dlugokencky@noaa.gov
Organization No 2
Organization acronym NOAA
Organization name Earth System Research Laboratory, NOAA
Organization country/territory United States of America
Address 2 325 Broadway R/GML-1
Address 3 Boulder, CO 80305-3328
Country/territory United States of America
Tel 303-497-6228
Last updated date 2020-08-26

NO 2
Acronym NOAA
Name Earth System Research Laboratory, NOAA

NO 46
Acronym MGO
Name Voeikov Main Geophysical Observatory
 Background observation
 9999-12-31 00:00:00 - 9999-12-31 23:59:59: WMO CH4 X2004A
 2010-09-01 00:00:00 - 2013-07-04 23:59:59: DLT100 (Los Gatos Research)(off-axis integrated cavity output spectroscopy (OA-ICOS))
 2013-07-05 00:00:00 - 9999-12-31 23:59:59: G2301 Picarro, Inc.(CRDS)
 2010-09-01 00:00:00 - 9999-12-31 23:59:59: 10 (m)
 1 minute
  Three calibration gas cylinders prepared at the WMO/GAW Central Calibration Laboratory in NOAA/ESRL, Boulder, CO, were measured automatically every 50 hours. In addition one target gas from MGO Voeikovo, St Petersburg was measured every 17 hours. 2013-07-07 00:00:00 - 9999-12-31 23:59:59, we used a target gas cylinder, which was calibrated against a set of CCL cylinders in FMI. 2017-05-31 00:00:00 - 9999-12-31 23:59:59 we used three calibration gases and a target gas, which were prepared at FMI and calibrated against a set of CCL cylinders in FMI.
 The raw data is calculated to one minute averages, and these averages are calculated to mixing ratios using linear equation based on automatic calibrations. Data is checked manually for values which don’t represent conditions when the measurement system is technically functioning well and flagged accordingly. Quality assurance procedures involve time series plots, target tank (i.e. cylinders containing natural air that are treated as (unknown) sample in a sequence of analyses) measurements, and comparison between the NOAA and MGO weekly flask samples and in-situ data.
 [Hourly] Valid 1min averages are calculated to hourly values. Thus, ND (the number of detections) refers to the number of available 1min averages within the respective 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.
 [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.
 Hourly data is flagged based on wind speed because there is a risk that ambient air concentrations are influenced by local wetland emissions when wind speed is low.

Flags: 1 - Valid
2 – Valid, wind speed lower than 3 m/s
3 - Missing value (or rejected due to system problems)
 Valid (background): 1
 Valid: 2
 Invalid: 3
 Sample air is drawn by Metal-Bellows MB-158E pump via 13 meter ¼” Teflon tube. Outdoor 9m section is heated. In 2010-09-01 00:00:00 - 2013-07-04 01:26:59sample air to the OA-ICOS analyzer was dried by a Nafion dryer. In the May-September periods, M&C cryo dryer (dew point -28C) was used upstream the Nafion drier. 2013-07-07 00:00:00 - 9999-12-31 23:59:59, we used CRDS measuring wet, without drying. Water vapor coefficients were measured in FMI before shipping.
 Wind direction: 1
 Wind speed: 1
 Relative humidity: 1
 Precipitation amount: 0
 Air pressure: 1
 Air temperature: 1
 Dew point temperature: 0
 Sea water temperature: 0
 Sea surface water temperature: 0
 Sea water salinity: 0
 Sea surface water salinity: 0
Meteorological data may remain as first provded, even when greenhouse gas data are updated.
 Meteo data are 1 hour averages. Time stamp is the beginning of the 1 hour period. Anemometer height 10m. Data is from the same point as gas measurements except when this data is missing, we used data by Tiksi synop station at 1.5km distance.
1  ISSN 1068-3739, Russian Meteorology and Hydrology, 2019, Vol. 44, No. 4, pp. 291–299. Ó Allerton Press, Inc., 2019.
Russian Text Ó V.M. Ivakhov, N.N. Paramonova, V.I. Privalov, A.V. Zinchenko, M.A. Loskutova, A.P. Makshtas, V.Y. Kustov, T. Laurila, M. Aurela, E. Asmi, 2019, published in Meteorologiya i Gidrologiya, 2019, No. 4, pp. 110–121.