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| Keppler, Lydia; Cravatte, Sophie; Chaigneau, Alexis; Pegliasco, Cori; Gourdeau, Lionel; Singh, Awnesh. |
| In the Southwest Pacific Ocean, waters transit from the subtropical gyre before being redistributed equatorward and poleward. While the mean pathways are known, the contribution to the mixing and transport of the water from mesoscale eddies has not been comprehensively investigated. In this research, satellite altimetry data, combined with an eddy detection and tracking algorithm is used to investigate the distribution and surface characteristics of mesoscale eddies in this region of complex bathymetry (10 degrees S-30 degrees S, 140 degrees E-190 degrees E). Detected eddies are then colocalized with in situ data from Argo floats to determine their vertical structure and the effect of eddies on the water masses. The numerous islands affect the eddy... |
| Tipo: Text |
Palavras-chave: Mesoscale eddies; Southwest Pacific; Argo floats; Satellite altimetry. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00489/60039/63314.pdf |
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| Singh, Awnesh; Delcroix, Thierry. |
| A significant surface freshening trend and an eastward expansion of fresh surface waters have been documented in the western tropical Pacific, consistent with the expected effects of climate change. The highest El Nino Southern Oscillation (ENSO) variability in Sea Surface Salinity (SSS) has been also documented in that region, with different quantitative signatures for the Eastern and Central Pacific ENSO events (EP and CP ENSO, respectively). This study hence analyses to what extent have the EP and CP ENSO events contributed to the long-term freshening trends, relying on 1955-2008 in situ SSS data and on EP and CP ENSO main features. We show the influence of EP ENSO events to be negligible, while CP El Nino events contribute to enhance the long-term... |
| Tipo: Text |
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| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00213/32450/30917.pdf |
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| Singh, Awnesh; Delcroix, Thierry; Cravatte, Sophie. |
| The recent detection of a central Pacific type of El Nino has added a new dimension to the El Nino-Southern Oscillation climatic puzzle. Sea surface salinity (SSS) observations collected during 1977-2008 in the tropical Pacific are used to contrast the three eastern Pacific (EP) (1982-1983, 1991-1992, 1997-1998) and seven central Pacific (CP) (1977-1978, 1986-1988, 1990-1991, 1992-1995, 2002-2003, 2004-2005, 2006-2007) types of El Nino events, as well as the six EP (1985-1986, 1988-1989, 1995-1996, 1999-2001, 2005-2006, 2007-2008) and two CP (1983-1984, 1998-1999) types of La Nina events. The EP El Nino events result in large (similar to 30 degrees longitude) eastward displacements of the eastern edge of the low-salinity warm pool waters in the equatorial... |
| Tipo: Text |
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| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00213/32452/30915.pdf |
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| Koliyavu, Timoci; Martias, Chloe; Singh, Awnesh; Mounier, Stéphane; Gérard, Philippe; Dupouy, Cecile. |
| Heavy rain events alter the biogeochemical outflows, affects water quality and ecosystem health within the coastal waters of small Pacific Islands. We characterized snapshots of the optical fingerprints of dissolved organic matter (DOM) sources together with the select nutrients, biogeochemical and physical variables for 10 stations in December 2017 in Laucala Bay, Fiji Islands. DOM absorption coefficients and fluorescence components were determined via spectrofluorometry and Parallel Factor Analysis identifying four components: Type M, two terrestrial (humic, fulvic) components, and a protein component linked to marine biological activity. Associations of DOM together with climate variables and the other tested variables were determined via principal... |
| Tipo: Text |
Palavras-chave: DOM absorption; Fluorescence; Biogeochemistry; PARAFAC; EEM spectra; Autochthonous; Allochthonous; Chlorophyll; CDOM; FDOM. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00682/79372/81889.pdf |
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