Evaluating Oceanic Uptake of Atmospheric CCl4: A Combined Analysis of Model Simulations and Observations

Parvadha Suntharalingam; E Buitenhuis; Lucy Jane Carpenter; Stephen Joseph Andrews; Sina Hackenberg; J BUTLER; MJ Messias

doi:10.1029/2018GL080612

Evaluating Oceanic Uptake of Atmospheric CCl4: A Combined Analysis of Model Simulations and Observations

Parvadha Suntharalingam, E Buitenhuis , Lucy Jane Carpenter, Stephen Joseph Andrews, Sina Hackenberg, J BUTLER, MJ Messias

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

We provide new estimates of the air‐sea flux of CCl4 using simulations from a global ocean biogeochemistry model (NEMO‐PlankTOM) in combination with depth‐resolved CCl4 observations from global oceanic databases. Estimates of global oceanic CCl4 uptake are derived from a range of model analyses, including prescribed parameterizations using reported values on hydrolysis and degradation, and analyses optimized using the global observational databases. We evaluate the sensitivity of our results to uncertainties in air‐sea gas exchange parameterization, estimation period, and circulation processes. Our best constrained estimate of ocean CCl4 uptake for the period 1996–2000 is 20.1 Gg/year (range 16.6–22.7), corresponding to estimates of the partial atmospheric lifetime with respect to ocean uptake of 124 (110–150) years. This new oceanic lifetime implies higher emissions of CCl4 than currently estimated and therefore a larger missing atmospheric source of CCl4.

Original language	English
Pages (from-to)	472-482
Number of pages	11
Journal	Geophysical Research Letters
Volume	46
Issue number	1
Early online date	30 Nov 2018
DOIs	https://doi.org/10.1029/2018GL080612
Publication status	Published - 16 Jan 2019

Keywords

air-sea fluxes
carbon tetrachloride
halocarbon
ozone-depleting substance

Access to Document

10.1029/2018GL080612Licence: CC BY-NC-ND

Suntharalingam_et_al-2019-Geophysical_Research_LettersFinal published version, 1.02 MBLicence: CC BY-NC-ND

Cite this

@article{dfa7a1cd685042d393be6fb11704101b,

title = "Evaluating Oceanic Uptake of Atmospheric CCl4: A Combined Analysis of Model Simulations and Observations",

abstract = "We provide new estimates of the air‐sea flux of CCl4 using simulations from a global ocean biogeochemistry model (NEMO‐PlankTOM) in combination with depth‐resolved CCl4 observations from global oceanic databases. Estimates of global oceanic CCl4 uptake are derived from a range of model analyses, including prescribed parameterizations using reported values on hydrolysis and degradation, and analyses optimized using the global observational databases. We evaluate the sensitivity of our results to uncertainties in air‐sea gas exchange parameterization, estimation period, and circulation processes. Our best constrained estimate of ocean CCl4 uptake for the period 1996–2000 is 20.1 Gg/year (range 16.6–22.7), corresponding to estimates of the partial atmospheric lifetime with respect to ocean uptake of 124 (110–150) years. This new oceanic lifetime implies higher emissions of CCl4 than currently estimated and therefore a larger missing atmospheric source of CCl4.",

keywords = "air-sea fluxes, carbon tetrachloride, halocarbon, ozone-depleting substance",

author = "Parvadha Suntharalingam and E Buitenhuis and Carpenter, {Lucy Jane} and Andrews, {Stephen Joseph} and Sina Hackenberg and J BUTLER and MJ Messias",

year = "2019",

month = jan,

day = "16",

doi = "10.1029/2018GL080612",

language = "English",

volume = "46",

pages = "472--482",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "American Geophysical Union",

number = "1",

}

TY - JOUR

T1 - Evaluating Oceanic Uptake of Atmospheric CCl4

T2 - A Combined Analysis of Model Simulations and Observations

AU - Suntharalingam, Parvadha

AU - Buitenhuis , E

AU - Carpenter, Lucy Jane

AU - Andrews, Stephen Joseph

AU - Hackenberg, Sina

AU - BUTLER, J

AU - Messias , MJ

PY - 2019/1/16

Y1 - 2019/1/16

N2 - We provide new estimates of the air‐sea flux of CCl4 using simulations from a global ocean biogeochemistry model (NEMO‐PlankTOM) in combination with depth‐resolved CCl4 observations from global oceanic databases. Estimates of global oceanic CCl4 uptake are derived from a range of model analyses, including prescribed parameterizations using reported values on hydrolysis and degradation, and analyses optimized using the global observational databases. We evaluate the sensitivity of our results to uncertainties in air‐sea gas exchange parameterization, estimation period, and circulation processes. Our best constrained estimate of ocean CCl4 uptake for the period 1996–2000 is 20.1 Gg/year (range 16.6–22.7), corresponding to estimates of the partial atmospheric lifetime with respect to ocean uptake of 124 (110–150) years. This new oceanic lifetime implies higher emissions of CCl4 than currently estimated and therefore a larger missing atmospheric source of CCl4.

AB - We provide new estimates of the air‐sea flux of CCl4 using simulations from a global ocean biogeochemistry model (NEMO‐PlankTOM) in combination with depth‐resolved CCl4 observations from global oceanic databases. Estimates of global oceanic CCl4 uptake are derived from a range of model analyses, including prescribed parameterizations using reported values on hydrolysis and degradation, and analyses optimized using the global observational databases. We evaluate the sensitivity of our results to uncertainties in air‐sea gas exchange parameterization, estimation period, and circulation processes. Our best constrained estimate of ocean CCl4 uptake for the period 1996–2000 is 20.1 Gg/year (range 16.6–22.7), corresponding to estimates of the partial atmospheric lifetime with respect to ocean uptake of 124 (110–150) years. This new oceanic lifetime implies higher emissions of CCl4 than currently estimated and therefore a larger missing atmospheric source of CCl4.

KW - air-sea fluxes

KW - carbon tetrachloride

KW - halocarbon

KW - ozone-depleting substance

UR - http://www.scopus.com/inward/record.url?scp=85059902016&partnerID=8YFLogxK

U2 - 10.1029/2018GL080612

DO - 10.1029/2018GL080612

M3 - Article

SN - 0094-8276

VL - 46

SP - 472

EP - 482

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 1

ER -

Evaluating Oceanic Uptake of Atmospheric CCl4: A Combined Analysis of Model Simulations and Observations

Abstract

Keywords

Access to Document

Other files and links

Profiles

Lucy Jane Carpenter

Cite this