Atmospheric methane and carbon dioxide from the SWERUS-C3 Arctic Ocean expedition in 2014, leg 2

Brett Thornton, Kristian Andersson, Patrick Crill

Shipborne atmospheric measurements of methane (CH₄) and carbon dioxide (CO₂) from the Eastern Arctic Ocean in August and September 2014.

This dataset provides rare measurements of CH₄ and CO₂ in the near-sea surface atmosphere and CH₄ in the surface layer of the Eastern Arctic Ocean and its marginal seas. These measurements are needed for Arctic carbon cycle studies and understanding emissions of CH₄ from marine sources in the Arctic.

Measurements were made onboard the Swedish icebreaker Oden at 9, 15, 20, and 35 m heights above sea surface during leg 2 of the SWERUS-C3 expedition to the Arctic Ocean.

Citation

Brett Thornton, Kristian Andersson, Patrick Crill (2020). Atmospheric methane and carbon dioxide from the SWERUS-C3 Arctic Ocean expedition in 2014, leg 2. Dataset version 1.0. Bolin Centre Database. https://doi.org/10.17043/swerus-2014-ghg

References

Berchet A, Pison I, Crill PM, Thornton B, Bousquet P, Thonat T, Hocking T, Thanwerdas J, Paris J-D, Saunois M (2020). Using ship-borne observations of methane isotopic ratio in the Arctic Ocean to understand methane sources in the Arctic. Atmos. Chem. Phys. 20, 3987⁠ – 3998 https://doi.org/10.5194/acp-20-3987-2020

Thornton BF, Geibel MC, Crill PM, Humborg C, Mörth C‐M (2016). Methane fluxes from the sea to the atmosphere across the Siberian shelf seas. Geophys. Res. Lett. 43, 5869⁠ – 5877. https://doi.org/10.1002/2016GL068977

Thornton B, Geibel M, Crill P, Humborg C (2016). Atmospheric methane and carbon dioxide and surface water methane from the SWERUS-C3 Arctic Ocean expedition in 2014, leg 1. Dataset version 1.0. Bolin Centre Database. https://doi.org/10.17043/thornton-2016

Thornton B, Andersson K, Crill P (2020). Carbon isotope ratio (δ¹³C) in atmospheric methane from the SWERUS-C3 Arctic Ocean expedition in 2014. Dataset version 1.0. Bolin Centre Database. https://doi.org/10.17043/swerus-2014-d13c

Data description

The data are provided in one comma-separated values (csv) file with seven columns:

1. Date and time (SQL style)
2. Valve position (inlet height, see below)
3. GPS latitude
4. GPS longitude
5. GPS day-of-year (UTC time)
6. Calibrated CO₂ (ppm)
7. Calibrated CH₄ (ppm)

Calibrated CH₄ and CO₂ are measured in the air at 9, 15, 20, and 35 m heights above sea surface.

Valve position corresponds to measurement height above sea level: 1 = 4 m (not used in this dataset), 2 = 9 m, 3 = 20 m, 4 = 15 m, 5 = 35 m.

The atmospheric data have been filtered for windspeed, wind direction, and CO₂ > 450 ppm (filters are designed to remove possible ship influence from data). Measurements are from a Los Gatos Research FGGA-24EP spectrometer. Data period is day-of-year 229⁠ – ⁠269 of 2014.

Some further details are provided in a readme file.

Comments

Related datasets also available:

• Atmospheric methane and carbon dioxide and surface water methane from the SWERUS-C3 Arctic Ocean expedition in 2014, leg 1 (day-of-year 192⁠ – ⁠229) (Thornton et al. 2016)
• Carbon isotope ratio (δ¹³C) in atmospheric methane from the SWERUS-C3 Arctic Ocean expedition in 2014 (Thornton et al. 2020).

Alternative contact person for this dataset: [javascript protected email address], Department of Geological Sciences, Stockholm University.