Long chain diols in settling particles in tropical oceans: insights into sources, seasonality and proxies
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PANGAEA
2019
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| author | de Bar, Marijke W Ullgren, Jenny Thunell, Robert C Wakeham, Stuart G Brummer, Geert-Jan A Stuut, Jan-Berend W Sinninghe Damsté, Jaap S Schouten, Stefan |
| author_facet | de Bar, Marijke W Ullgren, Jenny Thunell, Robert C Wakeham, Stuart G Brummer, Geert-Jan A Stuut, Jan-Berend W Sinninghe Damsté, Jaap S Schouten, Stefan |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | In this study we have analyzed sediment trap time series from five tropical sites to assess seasonal variations in concentrations and fluxes of long-chain diols (LCDs) and associated proxies with emphasis on the Long chain Diol Index (LDI). For the tropical Atlantic, we observe that generally less than 2 % of LCDs settling from the water column are preserved in the sediment. The Atlantic and Mozambique Channel traps reveal minimal seasonal variations in the LDI, similar to the TEX86 and UK'37. However, annual mean LDI-derived temperatures are in good agreement with the annual mean satellite-derived sea surface temperatures (SSTs). In the Cariaco Basin the LDI shows larger seasonal variation, as do the TEX86 and UK'37. Here, the LDI underestimates SST during the warmest months, which is likely due to summer stratification and the habitat depth of the diol producers deepening to around 20 to 30 m. Surface sediment LDI temperatures in the Atlantic and Mozambique Channel compare well with the average LDI-derived temperatures from the overlying sediment traps, as well as with decadal annual mean SST. Lastly, we observed large seasonal variations in the Diol Index, as indicator of upwelling conditions, at three sites, potentially linked to Guinea Dome upwelling (Eastern Atlantic), seasonal upwelling (Cariaco Basin) and seasonal upwelling and/or eddy migration (Mozambique Channel). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_898278 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Long chain diols in settling particles in tropical oceans: insights into sources, seasonality and proxies de Bar, Marijke W Ullgren, Jenny Thunell, Robert C Wakeham, Stuart G Brummer, Geert-Jan A Stuut, Jan-Berend W Sinninghe Damsté, Jaap S Schouten, Stefan NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University In this study we have analyzed sediment trap time series from five tropical sites to assess seasonal variations in concentrations and fluxes of long-chain diols (LCDs) and associated proxies with emphasis on the Long chain Diol Index (LDI). For the tropical Atlantic, we observe that generally less than 2 % of LCDs settling from the water column are preserved in the sediment. The Atlantic and Mozambique Channel traps reveal minimal seasonal variations in the LDI, similar to the TEX86 and UK'37. However, annual mean LDI-derived temperatures are in good agreement with the annual mean satellite-derived sea surface temperatures (SSTs). In the Cariaco Basin the LDI shows larger seasonal variation, as do the TEX86 and UK'37. Here, the LDI underestimates SST during the warmest months, which is likely due to summer stratification and the habitat depth of the diol producers deepening to around 20 to 30 m. Surface sediment LDI temperatures in the Atlantic and Mozambique Channel compare well with the average LDI-derived temperatures from the overlying sediment traps, as well as with decadal annual mean SST. Lastly, we observed large seasonal variations in the Diol Index, as indicator of upwelling conditions, at three sites, potentially linked to Guinea Dome upwelling (Eastern Atlantic), seasonal upwelling (Cariaco Basin) and seasonal upwelling and/or eddy migration (Mozambique Channel). |
| title | Long chain diols in settling particles in tropical oceans: insights into sources, seasonality and proxies |
| topic | NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University |
| url | https://doi.org/10.1594/PANGAEA.898278 |