Loncaric, Neven; Peeters, Frank J C; Kroon, Dick; Brummer, Geert-Jan A (2006): (Table 3) Stable oxagen isotope record of planktonic foraminifera from Central Walvish Ridge [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.834581, Supplement to: Loncaric, N et al. (2006): Oxygen isotope ecology of recent planktic foraminifera at the central Walvis Ridge (SE Atlantic). Paleoceanography, 21(3), PA3009, https://doi.org/10.1029/2005PA001207
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Published: 2006 (exact date unknown) • DOI registered: 2014-08-28
Abstract:
Above the Walvis Ridge, in the SE Atlantic Ocean, we collected living plantkic foraminifera from the upper water column using depth stratified plantkon tows. The oxygen isotope composition (d18Oc) in shells of foraminifera and shell concentration profiles show seasonal and depth habitats of individual species. The tow results are compared with the average annual deposition d18Oc from sediment traps and the interannual average d18Oc of fossil specimens in top sediments at the same site. The species Globigerinita glutinata best reflects the austral winter/spring sea surface temperature (SST). Its d18Oc signal in top sediments remains pristine. In contrast, tow results also show that Globigerinoides ruber continues to calcify below the surface mixed layer (SML), i.e., down to the deep chlorophyll maximum (DCM); hence its d18Oc signature of exported specimens reflects the SST only when SML incorporates the DCM. Deep tow and sediment trap results show that both Globorotalia truncatulinoides and Globorotalia inflata record the temperature between 150 and 350 m, depending on the season and the shell size. However, for all fossil taxa in sediments apart from Globigerinita glutinata, we observe a positive d18Oc shift with respect to the sediment trap and plankton tow values, likely related to the interannual flux changes and deep encrustation.
Further details:
Kim, Sang-Tae; O'Neil, James R (1997): Equilibrium and nonequilibrium oxygen isotope effects in synthetic carbonates. Geochimica et Cosmochimica Acta, 61(16), 3461-3475, https://doi.org/10.1016/S0016-7037(97)00169-5
Coverage:
Median Latitude: -27.028638 * Median Longitude: 3.890527 * South-bound Latitude: -27.100170 * West-bound Longitude: 3.853000 * North-bound Latitude: -26.961830 * East-bound Longitude: 3.971000
Date/Time Start: 2000-02-19T00:00:00 * Date/Time End: 2001-02-02T00:00:00
Minimum DEPTH, water: 5.0 m * Maximum DEPTH, water: 750.0 m
Event(s):
154P03 (MARE-0) * Latitude Start: -27.016830 * Longitude Start: 3.868830 * Latitude End: -27.100170 * Longitude End: 3.927500 * Date/Time: 2000-02-19T00:00:00 * Location: Walvis Ridge * Method/Device: Net (NET)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, water | Depth water | m | Geocode | ||
| 3 | Globigerinoides trilobus, δ18O | G. trilobus δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | fine (200-300µm) |
| 4 | Globigerinoides trilobus, δ18O | G. trilobus δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | coarse (350-450 µm) |
| 5 | Globigerinoides ruber, δ18O | G. ruber δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | fine (200-300µm) |
| 6 | Globigerinoides ruber, δ18O | G. ruber δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | coarse (350-450 µm) |
| 7 | Globigerinita glutinata, δ18O | G. glutinata δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | fine (200-300µm) |
| 8 | Globorotalia inflata, δ18O | G. inflata δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | fine (200-300µm) |
| 9 | Globorotalia inflata, δ18O | G. inflata δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | coarse (350-450 µm) |
| 10 | Globorotalia truncatulinoides sinistral, δ18O | G. truncatulinoides s δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | fine (200-300µm) |
| 11 | Globorotalia truncatulinoides sinistral, δ18O | G. truncatulinoides s δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | coarse (350-450 µm) |
| 12 | Globorotalia truncatulinoides dextral, δ18O | G. truncatulinoides d δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | fine (200-300µm) |
| 13 | Globorotalia truncatulinoides dextral, δ18O | G. truncatulinoides d δ18O | ‰ PDB | Loncaric, Neven | Mass spectrometer, Finnigan, MAT 252 | coarse (350-450 µm) |
| 14 | δ18O | δ18O | ‰ | Loncaric, Neven | equation of Kim and O'Neil (1997) | |
| 15 | δ18O, water | δ18O H2O | ‰ SMOW | Loncaric, Neven | ||
| 16 | Temperature, water | Temp | °C | Loncaric, Neven | ||
| 17 | Salinity | Sal | Loncaric, Neven |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
239 data points