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  • 1
    Electronic Resource
    Electronic Resource
    Vigorous exchange between the Indian and Atlantic oceans at the end of the past five glacial periods (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 430 (2004), S. 661-665 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The magnitude of heat and salt transfer between the Indian and Atlantic oceans through ‘Agulhas leakage’ is considered important for balancing the global thermohaline circulation. Increases or reductions of this leakage lead to strengthening or weakening of the Atlantic meridional ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02785
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    Paper (German National Licenses)
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  • 2
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    Shell flux and oxygen isotope data of North Atlantic foraminifera (2010)
    PANGAEA
    In:  Supplement to: Jonkers, Lukas; Brummer, Geert-Jan A; Peeters, Frank J C; van Aken, Hendrik M; de Jong, M Femke (2010): Seasonal stratification, shell flux, and oxygen isotope dynamics of left-coiling N. pachyderma and T. quinqueloba in the western subpolar North Atlantic. Paleoceanography, 25, PA2204, https://doi.org/10.1029/2009PA001849
    Details
    Publication Date: 2023-02-12
    Description: We present an almost 3 year long time series of shell fluxes and oxygen isotopes of left-coiling Neogloboquadrina pachyderma and Turborotalita quinqueloba from sediment traps moored in the deep central Irminger Sea. We determined their response to the seasonal change from a deeply mixed water column with occasional deep convection in winter to a thermally stratified water column with a surface mixed layer (SML) of around 50 m in summer. Both species display very low fluxes during winter with a remnant summer population holding out until replaced by a vital population that seeds the subsequent blooms. This annual population overturning is marked by a 0.7 per mill increase in d18O in both species. The shell flux of N. pachyderma peaks during the spring bloom and in late summer, when stratification is close to its minimum and maximum, respectively. Both export periods contribute about equally and account for 〉95% of the total annual flux. Shell fluxes of T. quinqueloba show only a single broad pulse in summer, thus following the seasonal stratification cycle. The d18O of N. pachyderma reflects temperatures just below the base of the seasonal SML without offset from isotopic equilibrium. The d18O pattern of T. quinqueloba shows a nearly identical amplitude and correlates highly with the d18O of N. pachyderma. Therefore T. quinqueloba also reflects temperature near the base of the SML but with a positive offset from isotopic equilibrium. These offsets contrast with observations elsewhere and suggest a variable offset from equilibrium calcification for both species. In the Irminger Sea the species consistently show a contrast in their flux timings. Their flux-weighted delta d18O will thus dominantly be determined by seasonal temperature differences at the base of the SML rather than by differences in their depth habitat. Consequently, their sedimentary delta d18O may be used to infer the seasonal contrast in temperature at the base of the SML.
    Keywords: Calcium carbonate, flux; Calculated, see reference(s); Carbon, organic, flux; Carlo Erba Flash; DATE/TIME; Date/time end; Event label; Flux of total mass; Foraminifera, planktic, other, flux; IRM_1; IRM_3; IRM_4; Isotope ratio mass spectrometry; Neogloboquadrina pachyderma sinistral, flux; Neogloboquadrina pachyderma sinistral, δ18O; Nitrogen, total, flux; North Atlantic; Silicon, flux; Standard error; Trap, sediment; TRAPS; Turborotalita quinqueloba, flux; Turborotalita quinqueloba, δ18O
    Type: Dataset
    Format: text/tab-separated-values, 671 data points
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  • 3
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    (Table S1) Globorotalia inflata 14C AMS ages and calibrated calendar year ages for core MD02-2594
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; Calibration; CALYPSO; Calypso Corer; Comment; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Fraction; Fraction modern carbon; IMAGES; International Marine Global Change Study; Marion Dufresne (1995); Material; MD02-2594; MD128; Method comment; Reservoir effect/correction; Sample code/label; Southern Ocean; SWAF; Traces
    Type: Dataset
    Format: text/tab-separated-values, 196 data points
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  • 4
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    (Table 3) Stable oxagen isotope record of planktonic foraminifera from Central Walvish Ridge
    PANGAEA
    In:  Supplement to: Loncaric, Neven; Peeters, Frank J C; Kroon, Dick; Brummer, Geert-Jan A (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
    Details
    Publication Date: 2023-05-12
    Description: 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.
    Keywords: 1086-1089; 154P03; 174P03; DEPTH, water; Event label; Globigerinita glutinata, δ18O; Globigerinoides ruber, δ18O; Globigerinoides trilobus, δ18O; Globorotalia inflata, δ18O; Globorotalia truncatulinoides dextral, δ18O; Globorotalia truncatulinoides sinistral, δ18O; MARE-0; MARE-II; MARE-III; Mass spectrometer Finnigan MAT 252; Net; NET; Salinity; Temperature, water; Walvis Ridge; δ18O; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 239 data points
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  • 5
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    Multicentennial resolution proxy records from splicings of MD96-2080 and MD02-2594, Agulhas Bank Splice (ABS)
    PANGAEA
    In:  Supplement to: Martínez Méndez, Gema; Zahn, Rainer; Hall, Ian R; Peeters, Frank J C; Pena, Leopoldo D; Cacho, Isabel; Negre, César (2010): Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years. Paleoceanography, 25(4), PA4227, https://doi.org/10.1029/2009PA001879
    Details
    Publication Date: 2023-06-01
    Description: [1] Planktonic d18O and Mg/Ca-derived sea surface temperature (SST) records from the Agulhas Corridor off South Africa display a progressive increase of SST during glacial periods of the last three climatic cycles. The SST increases of up to 4°C coincide with increased abundance of subtropical planktonic foraminiferal marker species which indicates a progressive warming due to an increased influence of subtropical waters at the core sites. Mg/Ca-derived SST maximizes during glacial maxima and glacial Terminations to values about 2.5°C above full-interglacial SST. The paired planktonic d18O and Mg/Ca-derived SST records yield glacial seawater d18O anomalies of up to 0.8 per mill, indicating measurably higher surface salinities during these periods. The SST pattern along our record is markedly different from a UK'37-derived SST record at a nearby core location in the Agulhas Corridor that displays SST maxima only during glacial Terminations. Possible explanations are lateral alkenone advection by the vigorous regional ocean currents or the development of SST contrasts during glacials in association with seasonal changes of Agulhas water transports and lateral shifts of the Agulhas retroflection. The different SST reconstructions derived from UK'37 and Mg/Ca pose a significant challenge to the interpretation of the proxy records and demonstrate that the reconstruction of the Agulhas Current and interocean salt leakage is not as straightforward as previously suggested.
    Keywords: IMAGES; International Marine Global Change Study
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
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    The record of stable isotope composition of surface and thermocline planktic foraminifera from sediment core 64PE-174P13 for the last 460,000 years
    PANGAEA
    In:  Supplement to: Scussolini, Paolo; Peeters, Frank J C (2013): A record of the last 460 thousand years of upper ocean stratification from the central Walvis Ridge, South Atlantic. Paleoceanography, 28(3), 426-439, https://doi.org/10.1002/palo.20041
    Details
    Publication Date: 2023-06-27
    Description: The upper branch of the Atlantic Meridional Overturning Circulation predominantly enters the Atlantic Ocean through the southeast, where the subtropical gyre is exposed to the influence of the Agulhas leakage (AL). To understand how the transfer of Indian Ocean waters via the AL affected the upper water column of this region, we have generated new proxy records of planktic foraminifera from a core on the central Walvis Ridge, on the eastern flank of the South Atlantic Gyre (SAG). We analyzed the isotopic composition of subsurface dweller Globigerinoides ruber sensu lato, and thermocline Globorotalia truncatulinoides sinistral, spanning the last five Pleistocene glacial-interglacial (G-IG) cycles. The former displays a response to obliquity, suggesting connection with high latitude forcing, and a warming tendency during each glacial termination, in response to the interhemispheric seesaw. The d18O difference between the two species, interpreted as a proxy for upper ocean stratification, reveals a remarkably regular sawtooth pattern, bound to G-IG cyclicity. It rises from interglacials until glacial terminations, with fast subsequent decrease, appearing to promptly respond to deglacial peaks of AL. Stratification, however, bears a different structure during the last cycle, being minimal at Last Glacial Maximum, and peaking at Termination I. We suggest this to be the result of the intensified glacial wind field over the SAG and/or of the invasion of the South Atlantic thermocline by Glacial North Atlantic Intermediate Waters. The d13C time series of the two species have similar G-IG pattern, whereas their difference is higher during interglacials. We propose that this may be the result of the alternation of intermediate water masses in different circulation modes, and of a regionally more efficient biological pump at times of high pCO2.
    Keywords: 64PE-174P13; AGE; DEPTH, sediment/rock; Globigerinoides ruber sensu lato, δ13C; Globigerinoides ruber sensu lato, δ18O; Globorotalia truncatulinoides sinistral, δ13C; Globorotalia truncatulinoides sinistral, δ18O; Mass spectrometer Finnigan Delta Plus; PC; Piston corer; Walvis Ridge
    Type: Dataset
    Format: text/tab-separated-values, 944 data points
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  • 7
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    Planktic foraminifera isotopes, temperature and δ¹⁸O of seawater at the central Walvis Ridge for Termination II (MIS 6 to 5), sediment core 64PE-174P13 (2015)
    PANGAEA
    In:  Supplement to: Scussolini, Paolo; Marino, Gianluca; Brummer, Geert-Jan A; Peeters, Frank J C (2015): Saline Indian Ocean waters invaded the South Atlantic thermocline during glacial termination II. Geology, 43(2), 139-142, https://doi.org/10.1130/G36238.1
    Details
    Publication Date: 2023-06-27
    Description: Salty and warm Indian Ocean waters enter the South Atlantic via the Agulhas leakage, south of Africa. Model simulations and proxy evidence of Agulhas leakage strengthening during glacial terminations led to the hypothesis that it was an important modulator of the Atlantic Ocean circulation. Yet, the fate of the leakage salinity and temperature anomalies remains undocumented beyond the southern tip of Africa. Downstream of the leakage, new paleoceanographic evidence from the central Walvis Ridge (southeast Atlantic) shows that salinity increased at the thermocline, and less so at the surface, during glacial termination II. Thermocline salinity change coincided with higher frequency of Agulhas rings passage at the core location and with salinity maxima in the Agulhas leakage area, suggesting that leakage waters were incorporated in the Atlantic circulation through the thermocline. Hydrographic changes at the Walvis Ridge and in the leakage area display a distinct two-step structure, with a reversal at ca. 134 ka. This matched a wet interlude within the East Asia weak monsoon interval of termination II, and a short-lived North Atlantic warming. Such concurrence points to a Bølling-Allerød-like recovery of the Atlantic circulation amidst termination II, with a northward shift of the Intertropical Convergence Zone and Southern Hemisphere westerlies, and attendant curtailment of the interocean connection south of Africa.
    Keywords: 64PE-174P13; AGE; Calculated; Calculated from Mg/Ca ratios (Anand et al., 2003); Calculated from Mg/Ca ratios (Regenberg et al. 2009); DEPTH, sediment/rock; Globigerinoides ruber sensu lato, δ18O; Globorotalia truncatulinoides sinistral, δ13C; Globorotalia truncatulinoides sinistral, δ18O; PC; Piston corer; Sea surface temperature; Thermocline water temperature; Walvis Ridge; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 561 data points
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  • 8
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    Proxy records of Globigerina bulloides from splicings of MD96-2080 and MD02-2594, Agulhas Bank Splice (ABS)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: after Peeters et al. 2004; Age model; Agulhas Leakage Fauna index; Calculated from Mg/Ca ratios (Mashiotta et al. 1999); CALYPSO; Calypso Corer; DEPTH, sediment/rock; Event label; Globigerina bulloides, Magnesium/Calcium ratio; Globigerina bulloides, weight; Globigerina bulloides, δ18O; ICP-MS, Perkin-Elmer, Elan 6000; IMAGES; IMAGES II; International Marine Global Change Study; Marion Dufresne (1995); Mass spectrometer Finnigan MAT 252; MD02-2594; MD105; MD128; MD96-2080; MD962080, ABS; Sea surface temperature; Southern Agulhas Bank; Southern Ocean; SWAF; Δδ18O
    Type: Dataset
    Format: text/tab-separated-values, 3054 data points
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  • 9
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    Morphometric data and stable isotope composition of sediment trap foraminifera from the West Antarctic Peninsula (2019)
    PANGAEA
    In:  Supplement to: Mikis, Anna; Hendry, Katharine R; Pike, Jennifer; Schmidt, Daniela N; Edgar, Kirsty M; Peck, Victoria L; Peeters, Frank J C; Leng, Melanie J; Meredith, Michael P; Todd, Chloe; Stammerjohn, Sharon; Ducklow, Hugh W (2019): Temporal variability in foraminiferal morphology and geochemistry at the West Antarctic Peninsula: a sediment trap study. Biogeosciences, 16(16), 3267-3282, https://doi.org/10.5194/bg-16-3267-2019
    Details
    Publication Date: 2023-07-07
    Description: These datasets contain a six-year long record of shell morphology of the polar planktic foraminifera Neogloboquadrina pachyderma (sensu stricto) from near Palmer Station, Antarctica. The PARFLUX Mark 78H 21-sample trap was deployed in 170m water depth as part of the Palmer Long Term Ecological Research program (total water column depth 350 m, 64° 30'S, 66° 00'W). For manual analysis: Specimens were imaged using Olympus SZX7 transmitted light microscope, QImaging FAST 1394 camera and Q-Capture software. Image backgrounds were adjusted in Adobe PhotoshopCC 2015. Morphological parameters were measured using ImageProPlus 6.2. For automated analysis: Bulk samples measured using automated microscope and image analysis system that scans and captures images via a 12 MP Olympus CC12 camera attached to a Wild MZ3 incident light microscope (Analysis3.0)
    Keywords: Anvers Island; Palmer Long-Term Ecological Research; Palmer-LTER; PalmerLTER_sedtrap; Trap, sediment; TRAPS
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 10
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    (Supplement 4) Bulk measurements of stable isotope composition from sediment trap foraminifera from the West Antarctic Peninsula (2019)
    PANGAEA
    Details
    Publication Date: 2023-07-07
    Keywords: Anvers Island; DATE/TIME; DEPTH, water; Neogloboquadrina pachyderma, δ13C; Neogloboquadrina pachyderma, δ13C standard deviation; Neogloboquadrina pachyderma, δ18O; Neogloboquadrina pachyderma, δ18O standard deviation; Palmer Long-Term Ecological Research; Palmer-LTER; PalmerLTER_sedtrap; Trap, sediment; TRAPS
    Type: Dataset
    Format: text/tab-separated-values, 96 data points
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