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A combined globally mapped carbon dioxide (CO2) flux estimate based on the Surface Ocean CO2 Atlas Database (SOCAT) and Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) biogeochemistry floats from 1982 to 2017 (NCEI Accession 0191304)

INVESTIGATORS:
Peter Landschützer ORCID logo - Max Planck Institute for Meteorology - Hamburg (MPI)
Seth M. Bushinsky - Princeton University, Princeton, NJ and University of Hawai’i - Mānoa, Honolulu, HI, USA
Alison R. Gray - School of Oceanography, University of Washington, Seattle, WA, USA

PACKAGE DESCRIPTION: This dataset contains a combined globally mapped estimate of the air-sea exchange of carbon dioxide (CO2) based on Surface Ocean CO2 Atlas Database (SOCAT) partial pressure of CO2 (pCO2) and calculated pCO2 from Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) biogeochemistry floats from 1982 to 2017. The pCO2 fields were created using a 2-step neural network technique. In a first step, the global ocean is divided into 16 biogeochemical provinces using a self-organizing map. In a second step, the non-linear relationship between variables known to drive the surface ocean carbon system and gridded observations from the SOCAT dataset (Bakker et al., 2016) starting in 1982 in various combinations with calculated pCO2 from biogeochemical ARGO floats starting in 2014 from the SOCCOM project (Johnson et al., 2017) is reconstructed using a feed-forward neural network within each province separately. The final product is then produced by projecting these driving variables, i.e., surface temperature, chlorophyll, mixed layer depth, and atmospheric CO2 onto oceanic pCO2 using these non-linear relationships. This results in monthly pCO2 fields at 1°x1° resolution covering the entire globe with the exception of the Arctic Ocean and few marginal seas. The air-sea CO2 flux is then computed using a standard bulk formula.

CITE AS: Landschützer, Peter; Bushinsky, Seth M.; Gray, Alison R. (2019). A combined globally mapped carbon dioxide (CO2) flux estimate based on the Surface Ocean CO2 Atlas Database (SOCAT) and Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) biogeochemistry floats from 1982 to 2017 (NCEI Accession 0191304). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/9hsn-xq82. Accessed [date].


DATA PACKAGES RELATED TO THIS ONE:
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0191304
NCEI DOI: https://doi.org/10.25921/9hsn-xq82

TYPES OF STUDY:
Data synthesis product;Surface underway;

TEMPORAL COVERAGE:
START DATE: 1982-01-01
END DATE: 2017-12-31

SPATIAL COVERAGE:
NORTH: 89.5
WEST: -180
EAST: 180
SOUTH: -89.5

GEOGRAPHIC NAMES:
World Ocean;

PLATFORMS:
SOCCOM floats and SOCAT data from SOOP lines;

RESEARCH PROJECT(S):
none;

VARIABLES / PARAMETERS:

latitude in degrees north (89.5°S - 89.5°N with 1° resolution)
Abbreviation: lat
Controlled vocabulary name: Latitude
longitude in degrees east (179.5°W-179.5°E with 1° resolution)
Abbreviation: lon
Controlled vocabulary name: Longitude
time in seconds since 2000-01-01-00:00 (monthly resolution)
Abbreviation: time
Controlled vocabulary name: Time
The raw 2-step neural network sea surface pCO2 output in μatm from both SOCAT and SOCCOM
Abbreviation: spco2_raw
Unit: μatm
Controlled vocabulary name: partial pressure of carbon dioxide - water
Observation type: calculated
The air-sea flux density, calculated from the raw sea surface pCO2 in mol m-2 yr-1
Abbreviation: fgco2_raw
Unit: mol m-2 yr-1
Controlled vocabulary name: partial pressure of carbon dioxide - flux
Observation type: calculated
A smoothed product of the raw pCO2, created by the spatial and temporal mean of each points neighboring pixels (the 3x3x3 pixel neighborhood domain) in μatm
Abbreviation: spco2_smoothed
Unit: μatm
Controlled vocabulary name: partial pressure of carbon dioxide - flux
Observation type: calculated
A smoothed product of the raw air-sea CO2 flux, created by the spatial and temporal mean of each points neighboring pixels (the 3x3x3 pixel neighborhood domain) in mol m-2 yr-1
Abbreviation: fgco2_smoothed
Unit: m-2 yr-1
Controlled vocabulary name: partial pressure of carbon dioxide - flux
Observation type: calculated
PUBLICATIONS DESCRIBING THIS DATASET:
Landschützer, P., Gruber, N., Bakker, D. C. E., Schuster, U.: Recent variability of the global ocean carbon sink, Global Biogeochemical Cycles, 28, https://doi.org/10.1002/2014GB004853, 2014
Bakker, D. C. E., et al. (2014). An update to the Surface Ocean CO2 Atlas (SOCAT version 2), Earth System Science Data, 6, 69-90, https://doi.org/10.5194/essd-6-69-2014
Johnson, K. S., J. N. Plant, L. J. Coletti, and others. 2017. Biogeochemical sensor performance in the SOCCOM profiling float array. J. Geophys. Res. Ocean. 122: 6416-6436. https://doi.org/10.1002/2017JC012838
Landschützer, P., Gruber, N., Bakker, D. C. E., Schuster, U., Nakaoka, S., Payne, M. R., Sasse, T., and Zeng, J.: A neural network-based estimate of the seasonal to inter-annual variability of the Atlantic Ocean carbon sink, Biogeosciences, 10, 7793-7815, https://doi.org/10.5194/bg-10-7793-2013, 2013.
ADDITIONAL INFORMATION:
More details regarding the method can be found in Landschützer et al. 2013 and Landschützer et al. 2014. Inquiries should be sent to Peter Landschützer: peter.landschuetzer@mpimet.mpg.de. Other data formats (e.g. matlab) available upon request.
FUNDING AGENCY:

SUBMITTED BY: Peter Landschützer (peter.landschuetzer@mpimet.mpg.de)

SUBMISSION DATE: 2019-07-08

REVISION DATE: 2019-07-19

PREVIOUS VERSIONS: Version 1.1