Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018
Abstract The decrease in δ13C of dissolved inorganic carbon (δ13CDIC) owing to uptake of anthropogenic CO2 (the oceanic 13C Suess effect) in the Southeastern Indian Ocean over the last decade was calculated using an extended multiparameter linear regression technique. Samples collected on the CROCCA...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2021-04-01
|
| Series: | Geochemistry, Geophysics, Geosystems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2020GC009402 |
| _version_ | 1797638059333779456 |
|---|---|
| author | Thomas J. Williams Amy J. Wagner Elisabeth L. Sikes Ellen E. Martin |
| author_facet | Thomas J. Williams Amy J. Wagner Elisabeth L. Sikes Ellen E. Martin |
| author_sort | Thomas J. Williams |
| collection | DOAJ |
| description | Abstract The decrease in δ13C of dissolved inorganic carbon (δ13CDIC) owing to uptake of anthropogenic CO2 (the oceanic 13C Suess effect) in the Southeastern Indian Ocean over the last decade was calculated using an extended multiparameter linear regression technique. Samples collected on the CROCCA‐2S (Coring to Reconstruct Ocean Circulation and Carbon Dioxide Across 2 Seas) cruise in November–December 2018 were compared to samples from the CLIVAR (Climate and Ocean: Variability, Predictability, and Change) and OISO (Océan Indien Service d'Observation) programs from 2007 to 2009. Surface ocean δ13CDIC decreased by an average of −0.53 ± 0.04‰ across this period, at an average rate of −0.053 ± 0.004‰ per year. This rate of δ13CDIC change is an increase from −0.021 ± 0.024‰ per year between 1994 and 2008. We find that the interior water mass most impacted by the oceanic 13C Suess effect between 2008 and 2018 was Subantarctic Mode Water (SAMW), within which δ13CDIC decreased by −0.044 ± 0.002‰ per year. Using previously published relationships between the oceanic 13C Suess effect and anthropogenic carbon, we estimate the annual storage of anthropogenic carbon within SAMW in the southeastern Indian Ocean has increased from ∼2.0 ± 0.2 μmol/kg per year between 1994 and 2008 to 5.5 ± 0.6 μmol/kg per year between 2008 and 2018. |
| first_indexed | 2024-03-11T12:58:13Z |
| format | Article |
| id | doaj.art-1fd62ca3a0b84899acf3a49e3d3fa095 |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-11T12:58:13Z |
| publishDate | 2021-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-1fd62ca3a0b84899acf3a49e3d3fa0952023-11-03T16:55:42ZengWileyGeochemistry, Geophysics, Geosystems1525-20272021-04-01224n/an/a10.1029/2020GC009402Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018Thomas J. Williams0Amy J. Wagner1Elisabeth L. Sikes2Ellen E. Martin3Department of Geological Sciences University of Florida Gainesville FL USAGeology Department California State University Sacramento CA USADepartment of Marine and Coastal Sciences Rutgers University New Brunswick NJ USADepartment of Geological Sciences University of Florida Gainesville FL USAAbstract The decrease in δ13C of dissolved inorganic carbon (δ13CDIC) owing to uptake of anthropogenic CO2 (the oceanic 13C Suess effect) in the Southeastern Indian Ocean over the last decade was calculated using an extended multiparameter linear regression technique. Samples collected on the CROCCA‐2S (Coring to Reconstruct Ocean Circulation and Carbon Dioxide Across 2 Seas) cruise in November–December 2018 were compared to samples from the CLIVAR (Climate and Ocean: Variability, Predictability, and Change) and OISO (Océan Indien Service d'Observation) programs from 2007 to 2009. Surface ocean δ13CDIC decreased by an average of −0.53 ± 0.04‰ across this period, at an average rate of −0.053 ± 0.004‰ per year. This rate of δ13CDIC change is an increase from −0.021 ± 0.024‰ per year between 1994 and 2008. We find that the interior water mass most impacted by the oceanic 13C Suess effect between 2008 and 2018 was Subantarctic Mode Water (SAMW), within which δ13CDIC decreased by −0.044 ± 0.002‰ per year. Using previously published relationships between the oceanic 13C Suess effect and anthropogenic carbon, we estimate the annual storage of anthropogenic carbon within SAMW in the southeastern Indian Ocean has increased from ∼2.0 ± 0.2 μmol/kg per year between 1994 and 2008 to 5.5 ± 0.6 μmol/kg per year between 2008 and 2018.https://doi.org/10.1029/2020GC009402carbon cyclechemical oceanographyIndian OceanSouthern Oceanstable carbon isotopesSuess effect |
| spellingShingle | Thomas J. Williams Amy J. Wagner Elisabeth L. Sikes Ellen E. Martin Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018 Geochemistry, Geophysics, Geosystems carbon cycle chemical oceanography Indian Ocean Southern Ocean stable carbon isotopes Suess effect |
| title | Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018 |
| title_full | Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018 |
| title_fullStr | Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018 |
| title_full_unstemmed | Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018 |
| title_short | Evolution of the Oceanic 13C Suess Effect in the Southeastern Indian Ocean Between 1994 and 2018 |
| title_sort | evolution of the oceanic 13c suess effect in the southeastern indian ocean between 1994 and 2018 |
| topic | carbon cycle chemical oceanography Indian Ocean Southern Ocean stable carbon isotopes Suess effect |
| url | https://doi.org/10.1029/2020GC009402 |
| work_keys_str_mv | AT thomasjwilliams evolutionoftheoceanic13csuesseffectinthesoutheasternindianoceanbetween1994and2018 AT amyjwagner evolutionoftheoceanic13csuesseffectinthesoutheasternindianoceanbetween1994and2018 AT elisabethlsikes evolutionoftheoceanic13csuesseffectinthesoutheasternindianoceanbetween1994and2018 AT ellenemartin evolutionoftheoceanic13csuesseffectinthesoutheasternindianoceanbetween1994and2018 |