Column-averaged dry-air mole fractions of CO2, CH4, and CO from direct sunlight measurements above the Pacific during the MORE-2 campaign 2019


Measurements of atmospheric column-averaged dry-air mole fractions of carbon dioxide (XCO2), methane (XCH4), and carbon monoxide (XCO) have been collected across the Pacific ocean during the Measuring Ocean REferences 2 (MORE-2) campaign in June 2019. We deployed a ship-going variant of the EM27/SUN Fourier Transform Spectrometer (FTS) on board the German research vessel 'Sonne' which, during MORE-2, crossed the Pacific ocean from Vancouver, Canada, to Singapore. Equipped with a custom-built fast solar tracker, the FTS operated in direct-sun view during the ship cruise reliably delivering solar absorption spectra in the shortwave infrared spectral range 4000 to 11000 1/cm. After filtering and bias correcting the dataset, we report on XCO2, XCH4, and XCO measurements for 19 days along a trajectory that largely aligns with 30° N of latitude between 140° W and 120° E of longitude. The dataset has been adjusted to the TCCON (Total Carbon Column Observing Network) station in Karlsruhe, Germany, before and after the MORE-2 campaign through side-by-side measurements. During the campaign the precision for hourly means is found 0.24 ppm, 1.1 ppb, and 0.75 ppb for XCO2, XCH4, and XCO, respectively.

Metadata Access
Creator Knapp, Marvin ORCID logo; Kleinschek, Ralph; Butz, André
Publisher PANGAEA
Publication Year 2020
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 164241 data points
Discipline Earth System Research
Spatial Coverage (-141.735W, 19.900S, 119.956E, 33.920N); Pacific Oean
Temporal Coverage Begin 2019-06-04T17:33:00Z
Temporal Coverage End 2019-06-29T05:20:00Z