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  • 1
    Electronic Resource
    Electronic Resource
    Interdecadal variation in the extent of South Pacific tropical waters during the Younger Dryas event (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 428 (2004), S. 927-929 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During the Younger Dryas event, about 12,000 years ago, the Northern Hemisphere cooled by between 2 and 10 °C (refs 1, 2) whereas East Antarctica experienced warming. But the spatial signature of the event in the southern mid-latitudes and tropics is less well ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02506
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Sea surface temperature and salinity reconstruction from coral geochemical tracers (2006)
    Elsevier
    In:  Palaeogeography, Palaeoclimatology, Palaeoecology, 232 (2-4). pp. 408-428.
    Details
    Publication Date: 2019-05-10
    Description: Massive scleractinian corals secrete an aragonitic skeleton which incorporates a large array of chemical tracers. Corals present several advantages for palaeoclimate research: they grow continuously, and can live up to 1000 years; they are easy to date; and they can be sampled at high resolution (weekly to monthly resolution). Both live and fossil corals can be collected in the field. In the past two decades, significant efforts have been made to identify robust tracers of sea surface temperature (SST) and salinity (SSS) in corals. To date, Sr/Ca and δ18O are considered to be the most reliable SST tracers, although changes in seawater δ18O can significantly alter SST reconstructed from coralline δ18O. Because these variations in seawater δ18O can be linked to SSS changes, this initial problem can in fact be turned into an advantage and provide us with an SSS tracer. The SST component in the coral δ18O signal can either be evaluated through Sr/Ca measurements, or in some case simply filtered out. However, there is still much uncertainty concerning the exact mode of incorporation of trace elements and stable isotopes into the coral skeleton. The effects of growth rate, light intensity, feeding habits, pH and water chemistry are still poorly documented. A review of the strength and weaknesses of Sr/Ca and δ18O is presented, together with some examples of SST and SSS reconstructions. Other potential SST tracers are also reviewed. It is expected that the ability to grow corals in aquarium under controlled conditions, and that the development of sophisticated analytical techniques at the micrometric level should help us understand better the robustness of each tracers and the factors controlling their incorporation in coral aragonite.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.palaeo.2005.10.014
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    High-resolution marine data and transient simulations support orbital forcing of ENSO amplitude since the mid-Holocene (2021)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Quaternary Science Reviews, PERGAMON-ELSEVIER SCIENCE LTD, 268, pp. 107125, ISSN: 0277-3791
    Details
    Publication Date: 2021-08-25
    Description: Lack of constraint on spatial and long-term temporal variability of the El Niño southern Oscillation (ENSO) and its sensitivity to external forcing limit our ability to evaluate climate models and ENSO future projections. Current knowledge of Holocene ENSO variability derived from paleoclimate reconstructions does not separate the role of insolation forcing from internal climate variability. Using an updated synthesis of coral and bivalve monthly resolved records, we build composite records of seasonality and interannual variability in four regions of the tropical Pacific: Eastern Pacific (EP), Central Pacific (CP), Western Pacific (WP) and South West Pacific (SWP). An analysis of the uncertainties due to the sampling of chaotic multidecadal to centennial variability by short records allows for an objective comparison with transient simulations (mid-Holocene to present) performed using four different Earth System models. Sea surface temperature and pseudo-δ18O are used in model-data comparisons to assess the potential influence of hydroclimate change on records. We confirm the significance of the Holocene ENSO minimum (HEM) 3-6ka compared to low frequency unforced modulation of ENSO, with a reduction of ENSO variance of ∼50 % in EP and ∼80 % in CP. The approach suggests that the increasing trend of ENSO since 6ka can be attributed to insolation, while models underestimate ENSO sensitivity to orbital forcing by a factor of 4.7 compared to data, even when accounting for the large multidecadal variability. Precession-induced change in seasonal temperature range is positively linked to ENSO variance in EP and to a lesser extent in other regions, in both models and observations. Our regional approach yields insights into the past spatial expression of ENSO across the tropical Pacific. In the SWP, today under the influence of the South Pacific Convergence Zone (SPCZ), interannual variability was increased by ∼200 % during the HEM, indicating that SPCZ variability is independent from ENSO on millennial time scales.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 4
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    Vanuatu fossil coral SST reconstruction for 4200 yr BP
    PANGAEA
    In:  Supplement to: Corrège, Thierry; Delcroix, Thierry; Recy, Jacques; Beck, Warren; Cabioch, Guy; Le Cornec, Florence (2000): Evidence for stronger El Niño-Southern Oscillation (ENSO) Events in a Mid-Holocene massive coral. Paleoceanography, 15(4), 465-470, https://doi.org/10.1029/1999PA000409
    Details
    Publication Date: 2023-05-12
    Description: We present a 47-year-long record of sea surface temperature (SST) derived from Sr/Ca and U/Ca analysis of a massive Porites coral which grew at ~4150 calendar years before present (B.P.) in Vanuatu (southwest tropical Pacific Ocean). Mean SST is similar in both the modern instrumental record and paleorecord, and both exhibit El Niño-Southern Oscillation (ENSO) frequency SST oscillations. However, several strong decadal-frequency cooling events and a marked modulation of the seasonal SST cycle, with power at both ENSO and decadal frequencies, are observed in the paleorecord, which are unprecedented in the modern record.
    Keywords: CDRILL; Core drilling; Drill9A_Tasmaloum
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    Sr/Ca and U/Ca ratios of a fossil coral from Tasmaloum
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: CDRILL; Core drilling; Drill9A_Tasmaloum; ORDINAL NUMBER; Strontium/Calcium ratio; Uranium/Calcium ratio
    Type: Dataset
    Format: text/tab-separated-values, 917 data points
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    DATA PANGAEA
  • 6
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    SST reconstruction trom a fossil coral from Tasmaloum
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Calculated; CDRILL; Core drilling; Drill9A_Tasmaloum; ORDINAL NUMBER; Sea surface temperature, annual mean
    Type: Dataset
    Format: text/tab-separated-values, 568 data points
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    DATA PANGAEA
  • 7
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    Clipperton Atoll replicated coral Sr/Ca-SST and reconstructed δ¹⁸O of seawater composite (1874-1994 CE) (2018)
    PANGAEA
    In:  Supplement to: Wu, Henry C; Moreau, Mélanie; Linsley, Braddock K; Schrag, Daniel P; Corrège, Thierry (2014): Investigation of sea surface temperature changes from replicated coral Sr/Ca variations in the eastern equatorial Pacific (Clipperton Atoll) since 1874. Palaeogeography, Palaeoclimatology, Palaeoecology, 412, 208-222, https://doi.org/10.1016/j.palaeo.2014.07.039
    Details
    Publication Date: 2024-02-21
    Description: Sub-seasonally resolved and replicated coral Sr/Ca time series at Clipperton Atoll (10°18'N, 109°13'W) in the eastern Pacific are assessed as a sea surface temperature (SST) proxy in this region with small seasonal SST variability. The composite coral Sr/Ca time series is a partially replicated record of three live and one sub-modern colony of Porites lobata extending back to 1874. Large inter-colony coral Sr/Ca offsets equate to relative SST differences of 0.6 to 4.3 °C and limit the ability to reconstruct absolute SST changes. Moreover, the replication method revealed a 12-year section of growth in one colony where mean Sr/Ca was anomalously low (~ 1 °C higher SST) relative to the other colonies without evidence of diagenesis or other significant skeletal alterations. The presence of this anomalous interval supports the need for multi-coral Sr/Ca replication in specific sites or regions. The Clipperton Composite Sr/Ca anomaly record is significantly coherent (r = 0.71-0.76, p 〈 0.001) with gridded instrumental SSTs but with larger amplitude decadal variance that appears to more accurately represent actual SST variability at Clipperton. The amplitude of the secular warming trend during the last century at Clipperton is 0.3 to 0.6 °C larger (~ twice as large) than the trend in the poorly "ground-truthed" instrumental SST records for the region. The interannual and decadal variability in Clipperton coral Sr/Ca demonstrates strong coherence to the Pacific Decadal Oscillation and the El Niño/Southern Oscillation (ENSO) with reduced ENSO variability from 1920 to late 1930s and enhanced variability in the late twentieth century.
    Keywords: Age; AGE; Clipperton Atoll; ClippertonComposite; Composite records; Porites lobata, Strontium/Calcium ratio; Porites lobata, Strontium/Calcium ratio anomaly; Porites lobata, δ18O; Porites lobata, δ18O anomaly; δ18O, seawater, reconstructed anomaly
    Type: Dataset
    Format: text/tab-separated-values, 8630 data points
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    DATA PANGAEA
  • 8
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    (Table 1) Geochemical analyses of ostracode shells from ODP Site 133-822 (1993)
    PANGAEA
    In:  Supplement to: Corrège, Thierry (1993): Preliminary results of paleotemperature reconstruction using the magnesim to calcium ratio of deep-sea ostracode shells from the Late Quaternary of Site 822, Leg 133 (wetsern Coral Sea). In: McKenzie, JA; Davies, PJ; Palmer-Julson, A; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 133, 175-180, https://doi.org/10.2973/odp.proc.sr.133.222.1993
    Details
    Publication Date: 2024-01-09
    Description: Analyses of living benthic ostracodes collected in the Coral Sea show a direct relationship between water temperature and the Mg/Ca ratio in the ostracode shells. Fossil ostracodes from Hole 822A (western edge of the Queensland Trough) were analyzed for their Mg and Ca content, and paleotemperatures are inferred using equations derived from the modern material. The bottom-water temperature record from Site 822, spanning the last 120,000 yr, indicates substantial cooling during glacial periods. It also documents important variations during an interval that is considered to correspond to isotopic stage 5. Although still preliminary, these results show that trace-element analyses of ostracode shells have a great potential for paleoceanographic studies.
    Keywords: 133-822; Calcium cation; COMPCORE; Composite Core; Coral Sea; DEPTH, sediment/rock; Joides Resolution; Leg133; Magnesium/Calcium ratio; Magnesium/Calcium ratio, standard deviation; Magnesium cation; Ocean Drilling Program; ODP; Sample code/label; Temperature, calculated
    Type: Dataset
    Format: text/tab-separated-values, 331 data points
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    DATA PANGAEA
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