A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870
Abstract This study reconstructs a century‐long South Atlantic Meridional Overturning Circulation (SAMOC) index. The reconstruction is possible due to its covariability with sea surface temperature (SST). A singular value decomposition (SVD) method is applied to the correlation matrix of SST and SAM...
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| Format: | Article |
| Language: | English |
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Wiley
2017-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL073227 |
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| author | Hosmay Lopez Gustavo Goni Shenfu Dong |
| author_facet | Hosmay Lopez Gustavo Goni Shenfu Dong |
| author_sort | Hosmay Lopez |
| collection | DOAJ |
| description | Abstract This study reconstructs a century‐long South Atlantic Meridional Overturning Circulation (SAMOC) index. The reconstruction is possible due to its covariability with sea surface temperature (SST). A singular value decomposition (SVD) method is applied to the correlation matrix of SST and SAMOC. The SVD is performed on the trained period (1993 to present) for which Expendable Bathythermographs and satellite altimetry observations are available. The joint modes obtained are used in the reconstruction of a monthly SAMOC time series from 1870 to present. The reconstructed index is highly correlated to the observational based SAMOC time series during the trained period and provides a long historical estimate. It is shown that the Interdecadal Pacific Oscillation (IPO) is the leading mode of SAMOC‐SST covariability, explaining ~85% with the Atlantic Niño accounting for less than 10%. The reconstruction shows that SAMOC has recently shifted to an anomalous positive period, consistent with a recent positive shift of the IPO. |
| format | Article |
| id | doaj-art-fa9579c77a78414d93e7e2bddebafa7b |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2017-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-fa9579c77a78414d93e7e2bddebafa7b2025-08-20T01:51:46ZengWileyGeophysical Research Letters0094-82761944-80072017-04-014473309331810.1002/2017GL073227A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870Hosmay Lopez0Gustavo Goni1Shenfu Dong2Cooperative Institute for Marine and Atmospheric Studies University of Miami Miami Florida USAAtlantic Oceanographic and Meteorological Laboratory NOAA Miami Florida USAAtlantic Oceanographic and Meteorological Laboratory NOAA Miami Florida USAAbstract This study reconstructs a century‐long South Atlantic Meridional Overturning Circulation (SAMOC) index. The reconstruction is possible due to its covariability with sea surface temperature (SST). A singular value decomposition (SVD) method is applied to the correlation matrix of SST and SAMOC. The SVD is performed on the trained period (1993 to present) for which Expendable Bathythermographs and satellite altimetry observations are available. The joint modes obtained are used in the reconstruction of a monthly SAMOC time series from 1870 to present. The reconstructed index is highly correlated to the observational based SAMOC time series during the trained period and provides a long historical estimate. It is shown that the Interdecadal Pacific Oscillation (IPO) is the leading mode of SAMOC‐SST covariability, explaining ~85% with the Atlantic Niño accounting for less than 10%. The reconstruction shows that SAMOC has recently shifted to an anomalous positive period, consistent with a recent positive shift of the IPO.https://doi.org/10.1002/2017GL073227AMOCsingular value decompositionSST |
| spellingShingle | Hosmay Lopez Gustavo Goni Shenfu Dong A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870 Geophysical Research Letters AMOC singular value decomposition SST |
| title | A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870 |
| title_full | A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870 |
| title_fullStr | A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870 |
| title_full_unstemmed | A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870 |
| title_short | A reconstructed South Atlantic Meridional Overturning Circulation time series since 1870 |
| title_sort | reconstructed south atlantic meridional overturning circulation time series since 1870 |
| topic | AMOC singular value decomposition SST |
| url | https://doi.org/10.1002/2017GL073227 |
| work_keys_str_mv | AT hosmaylopez areconstructedsouthatlanticmeridionaloverturningcirculationtimeseriessince1870 AT gustavogoni areconstructedsouthatlanticmeridionaloverturningcirculationtimeseriessince1870 AT shenfudong areconstructedsouthatlanticmeridionaloverturningcirculationtimeseriessince1870 AT hosmaylopez reconstructedsouthatlanticmeridionaloverturningcirculationtimeseriessince1870 AT gustavogoni reconstructedsouthatlanticmeridionaloverturningcirculationtimeseriessince1870 AT shenfudong reconstructedsouthatlanticmeridionaloverturningcirculationtimeseriessince1870 |