The OceanFlux Greenhouse Gases methodology for deriving a sea surface climatology of CO2 fugacity in support of air-sea gas flux studies

L. M. Goddijn-Murphy, D. K. Woolf, P. E. Land, J. D. Shutler, C. Donlon

Research output: Contribution to journalArticle

Abstract

Climatologies, or long-term averages, of essential climate variables are useful for evaluating models and providing a baseline for studying anomalies. The Surface Ocean CO<inf>2</inf> Atlas (SOCAT) has made millions of global underway sea surface measurements of CO<inf>2</inf> publicly available, all in a uniform format and presented as fugacity, f<inf>CO2</inf>. As f<inf>CO2</inf> is highly sensitive to temperature, the measurements are only valid for the instantaneous sea surface temperature (SST) that is measured concurrently with the in-water CO<inf>2</inf> measurement. To create a climatology of f<inf>CO2</inf> data suitable for calculating air-sea CO<inf>2</inf> fluxes, it is therefore desirable to calculate f<inf>CO2</inf> valid for a more consistent and averaged SST. This paper presents the OceanFlux Greenhouse Gases methodology for creating such a climatology. We recomputed SOCAT's f<inf>CO2</inf> values for their respective measurement month and year using monthly composite SST data on a 1° × 1° grid from satellite Earth observation and then extrapolated the resulting f<inf>CO2</inf> values to reference year 2010. The data were then spatially interpolated onto a 1° × 1° grid of the global oceans to produce 12 monthly f<inf>CO2</inf> distributions for 2010, including the prediction errors of f<inf>CO2</inf> produced by the spatial interpolation technique. The partial pressure of CO<inf>2</inf> (p<inf>CO2</inf>) is also provided for those who prefer to use p<inf>CO2</inf>. The CO<inf>2</inf> concentration difference between ocean and atmosphere is the thermodynamic driving force of the air-sea CO<inf>2</inf> flux, and hence the presented f<inf>CO2</inf> distributions can be used in air-sea gas flux calculations together with climatologies of other climate variables.

Original languageEnglish
Pages (from-to)519-541
Number of pages23
JournalOcean Science
Volume11
Issue number4
DOIs
Publication statusPublished - 8 Jul 2015

Fingerprint

fugacity
climatology
sea surface
greenhouse gas
sea surface temperature
methodology
air
gas
climate
global ocean
partial pressure
atlas
interpolation
thermodynamics
anomaly
atmosphere
ocean
prediction
sea
temperature

ASJC Scopus subject areas

  • Oceanography
  • Palaeontology

Cite this

Goddijn-Murphy, L. M. ; Woolf, D. K. ; Land, P. E. ; Shutler, J. D. ; Donlon, C. / The OceanFlux Greenhouse Gases methodology for deriving a sea surface climatology of CO2 fugacity in support of air-sea gas flux studies. In: Ocean Science. 2015 ; Vol. 11, No. 4. pp. 519-541.
@article{7a2c4709651d40e3828d3aeda64dcee4,
title = "The OceanFlux Greenhouse Gases methodology for deriving a sea surface climatology of CO2 fugacity in support of air-sea gas flux studies",
abstract = "Climatologies, or long-term averages, of essential climate variables are useful for evaluating models and providing a baseline for studying anomalies. The Surface Ocean CO2 Atlas (SOCAT) has made millions of global underway sea surface measurements of CO2 publicly available, all in a uniform format and presented as fugacity, fCO2. As fCO2 is highly sensitive to temperature, the measurements are only valid for the instantaneous sea surface temperature (SST) that is measured concurrently with the in-water CO2 measurement. To create a climatology of fCO2 data suitable for calculating air-sea CO2 fluxes, it is therefore desirable to calculate fCO2 valid for a more consistent and averaged SST. This paper presents the OceanFlux Greenhouse Gases methodology for creating such a climatology. We recomputed SOCAT's fCO2 values for their respective measurement month and year using monthly composite SST data on a 1° × 1° grid from satellite Earth observation and then extrapolated the resulting fCO2 values to reference year 2010. The data were then spatially interpolated onto a 1° × 1° grid of the global oceans to produce 12 monthly fCO2 distributions for 2010, including the prediction errors of fCO2 produced by the spatial interpolation technique. The partial pressure of CO2 (pCO2) is also provided for those who prefer to use pCO2. The CO2 concentration difference between ocean and atmosphere is the thermodynamic driving force of the air-sea CO2 flux, and hence the presented fCO2 distributions can be used in air-sea gas flux calculations together with climatologies of other climate variables.",
author = "Goddijn-Murphy, {L. M.} and Woolf, {D. K.} and Land, {P. E.} and Shutler, {J. D.} and C. Donlon",
note = "Accepted: 10 Jun 2015",
year = "2015",
month = "7",
day = "8",
doi = "10.5194/os-11-519-2015",
language = "English",
volume = "11",
pages = "519--541",
journal = "Ocean Science",
issn = "1812-0784",
publisher = "European Geosciences Union",
number = "4",

}

The OceanFlux Greenhouse Gases methodology for deriving a sea surface climatology of CO2 fugacity in support of air-sea gas flux studies. / Goddijn-Murphy, L. M.; Woolf, D. K.; Land, P. E.; Shutler, J. D.; Donlon, C.

In: Ocean Science, Vol. 11, No. 4, 08.07.2015, p. 519-541.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The OceanFlux Greenhouse Gases methodology for deriving a sea surface climatology of CO2 fugacity in support of air-sea gas flux studies

AU - Goddijn-Murphy, L. M.

AU - Woolf, D. K.

AU - Land, P. E.

AU - Shutler, J. D.

AU - Donlon, C.

N1 - Accepted: 10 Jun 2015

PY - 2015/7/8

Y1 - 2015/7/8

N2 - Climatologies, or long-term averages, of essential climate variables are useful for evaluating models and providing a baseline for studying anomalies. The Surface Ocean CO2 Atlas (SOCAT) has made millions of global underway sea surface measurements of CO2 publicly available, all in a uniform format and presented as fugacity, fCO2. As fCO2 is highly sensitive to temperature, the measurements are only valid for the instantaneous sea surface temperature (SST) that is measured concurrently with the in-water CO2 measurement. To create a climatology of fCO2 data suitable for calculating air-sea CO2 fluxes, it is therefore desirable to calculate fCO2 valid for a more consistent and averaged SST. This paper presents the OceanFlux Greenhouse Gases methodology for creating such a climatology. We recomputed SOCAT's fCO2 values for their respective measurement month and year using monthly composite SST data on a 1° × 1° grid from satellite Earth observation and then extrapolated the resulting fCO2 values to reference year 2010. The data were then spatially interpolated onto a 1° × 1° grid of the global oceans to produce 12 monthly fCO2 distributions for 2010, including the prediction errors of fCO2 produced by the spatial interpolation technique. The partial pressure of CO2 (pCO2) is also provided for those who prefer to use pCO2. The CO2 concentration difference between ocean and atmosphere is the thermodynamic driving force of the air-sea CO2 flux, and hence the presented fCO2 distributions can be used in air-sea gas flux calculations together with climatologies of other climate variables.

AB - Climatologies, or long-term averages, of essential climate variables are useful for evaluating models and providing a baseline for studying anomalies. The Surface Ocean CO2 Atlas (SOCAT) has made millions of global underway sea surface measurements of CO2 publicly available, all in a uniform format and presented as fugacity, fCO2. As fCO2 is highly sensitive to temperature, the measurements are only valid for the instantaneous sea surface temperature (SST) that is measured concurrently with the in-water CO2 measurement. To create a climatology of fCO2 data suitable for calculating air-sea CO2 fluxes, it is therefore desirable to calculate fCO2 valid for a more consistent and averaged SST. This paper presents the OceanFlux Greenhouse Gases methodology for creating such a climatology. We recomputed SOCAT's fCO2 values for their respective measurement month and year using monthly composite SST data on a 1° × 1° grid from satellite Earth observation and then extrapolated the resulting fCO2 values to reference year 2010. The data were then spatially interpolated onto a 1° × 1° grid of the global oceans to produce 12 monthly fCO2 distributions for 2010, including the prediction errors of fCO2 produced by the spatial interpolation technique. The partial pressure of CO2 (pCO2) is also provided for those who prefer to use pCO2. The CO2 concentration difference between ocean and atmosphere is the thermodynamic driving force of the air-sea CO2 flux, and hence the presented fCO2 distributions can be used in air-sea gas flux calculations together with climatologies of other climate variables.

UR - http://www.scopus.com/inward/record.url?scp=84937003051&partnerID=8YFLogxK

U2 - 10.5194/os-11-519-2015

DO - 10.5194/os-11-519-2015

M3 - Article

VL - 11

SP - 519

EP - 541

JO - Ocean Science

JF - Ocean Science

SN - 1812-0784

IS - 4

ER -