(Table 3) Stable oxagen isotope record of planktonic foraminifera from Central Walvish Ridge

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 individu...

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Bibliographic Details
Main Authors: Loncaric, Neven, Peeters, Frank J C, Kroon, Dick, Brummer, Geert-Jan A
Format: Dataset
Language:English
Published: PANGAEA 2006
Subjects:
1086-1089
154P03
174P03
DEPTH
water
Event label
Globigerinita glutinata
δ18O
Globigerinoides ruber
Globigerinoides trilobus
Globorotalia inflata
Globorotalia truncatulinoides dextral
Globorotalia truncatulinoides sinistral
MARE-0
MARE-II
MARE-III
Mass spectrometer Finnigan MAT 252
Net
Salinity
Temperature
Walvis Ridge
Austral
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.834581
https://doi.org/10.1594/PANGAEA.834581
Description
Summary: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.

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