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  • 1
    Electronic Resource
    Electronic Resource
    Chemical and biological trends during lake evolution in recently deglaciated terrain (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 408 (2000), S. 161-166 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As newly formed landscapes evolve, physical and biological changes occur that are collectively known as primary succession. Although succession is a fundamental concept in ecology, it is poorly understood in the context of aquatic environments. The prevailing view is that lakes become more ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35041500
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Compilation of planktic foraminifera LGM SST data from the Indo-Pacific Ocean (2004)
    PANGAEA
    Details
    Publication Date: 2023-02-21
    Keywords: MARGO; Multiproxy Approach for the Reconstruction of the Glacial Ocean surface
    Type: Dataset
    Format: application/vnd.ms-excel, 207.5 kBytes
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  • 3
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    Compilation of planktic foraminifera modern data from the Indo-Pacific Ocean
    PANGAEA
    In:  Supplement to: Barrows, Timothy T; Juggins, Stephen (2005): Sea-surface temperatures around the Australian margin and Indian Ocean during the last glacial maximum. Quaternary Science Reviews, 24(7-9), 1017-1047, https://doi.org/10.1016/j.quascirev.2004.07.020
    Details
    Publication Date: 2023-05-12
    Description: We present new last glacial maximum (LGM) sea-surface temperature (SST) maps for the oceans around Australia based on planktonic foraminifera assemblages. To provide the most reliable SST estimates we use the modern analog technique, the revised analog method, and artificial neural networks in conjunction with an expanded modern core top database. All three methods produce similar quality predictions and the root mean squared error of the consensus prediction (the average of the three) under cross-validation is only ±0.77 °C. We determine LGM SST using data from 165 cores, most of which have good age control from oxygen isotope stratigraphy and radiocarbon dates. The coldest SST occurred at 20,500±1400 cal yr BP, predating the maximum in oxygen isotope records at 18,200±1500 cal yr BP. During the LGM interval we observe cooling within the tropics of up to 4 °C in the eastern Indian Ocean, and mostly between 0 and 3 °C elsewhere along the equator. The high latitudes cooled by the greatest degree, a maximum of 7–9 °C in the southwest Pacific Ocean. Our maps improve substantially on previous attempts by making higher quality temperature estimates, using more cores, and improving age control.
    Keywords: MARGO; Multiproxy Approach for the Reconstruction of the Glacial Ocean surface
    Type: Dataset
    Format: application/vnd.ms-excel, 658.5 kBytes
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    DATA PANGAEA
  • 4
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    Sea surface temperature reconstruction for the LGM
    PANGAEA
    In:  Supplement to: Barrows, Timothy T; Juggins, Stephen; De Deckker, Patrick; Thiede, Jörn; Martínez, José Ignacio (2000): Sea-surface temperatures of the southwest Pacific Ocean during the Last Glacial Maximum. Paleoceanography, 15(1), 95-109, https://doi.org/10.1029/1999PA900047
    Details
    Publication Date: 2023-05-12
    Description: The southwest Pacific Ocean covers a broad range of surface-water conditions ranging from warm, salty water in the subtropical East Australian Current to fresher, cold water in the Circumpolar Current. Using a new database of planktonic foraminifera assemblages (AUSMAT-F2), we demonstrate that the modern analog technique can be used to accurately reconstruct the magnitude of sea-surfacetemperature (SST) in this region. We apply this technique to data from 29 deep-sea cores along a meridional transect of the southwest Pacific Ocean to estimate the magnitude of SST cooling during the Last Glacial Maximum. We find minimal cooling in the tropics (0°-2°C), moderate cooling in the subtropical midlatitudes (2°-6°C), and maximum cooling to the southeast of New Zealand (6°-10°C). The magnitude of cooling at the sea surface from the tropics to the temperate latitudes is found to generally be less than cooling at the surface of adjacent land masses.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
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    (Table 1) Age determination of sediment core SO136-003GC
    PANGAEA
    In:  Supplement to: Barrows, Timothy T; Juggins, Stephen; De Deckker, Patrick; Calvo, Eva; Pelejero, Carles (2007): Long-term sea surface temperature and climate change in the Australian-New Zealand region. Paleoceanography, 22(2), PA2215, https://doi.org/10.1029/2006PA001328
    Details
    Publication Date: 2023-06-27
    Description: We compile and compare data for the last 150,000 years from four deep-sea cores in the midlatitude zone of the Southern Hemisphere. We recalculate sea surface temperature estimates derived from foraminifera and compare these with estimates derived from alkenones and magnesium/calcium ratios in foraminiferal carbonate and with accompanying sedimentological and pollen records on a common absolute timescale. Using a stack of the highest-resolution records, we find that first-order climate change occurs in concert with changes in insolation in the Northern Hemisphere. Glacier extent and inferred vegetation changes in Australia and New Zealand vary in tandem with sea surface temperatures, signifying close links between oceanic and terrestrial temperature. In the Southern Ocean, rapid temperature change of the order of 6°C occurs within a few centuries and appears to have played an important role in midlatitude climate change. Sea surface temperature changes over longer periods closely match proxy temperature records from Antarctic ice cores. Warm events correlate with Antarctic events A1-A4 and appear to occur just before Dansgaard-Oeschger events 8, 12, 14, and 17 in Greenland.
    Keywords: Age, 14C AMS; Age, calibrated; Age, dated; Age, dated, error to older; Age, dated, error to younger; Calendar age; Confidence interval; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GC; Globigerina bulloides, δ13C; Gravity corer; Mass spectrometer Finnigan MAT 251; Sample ID; SO136; SO136_003GC; Sonne; TASQWA; δ13C, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 194 data points
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  • 6
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    (Appendix B) Planktonic foraminifera in sediment cores used for Last Glacial Maximum Reconstruction (2015)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Candeina nitida; DEPTH, sediment/rock; E26-1; Elevation of event; Epoch; Event label; FR1/94-GC3; GC; Globigerina bulloides; Globigerina digitata; Globigerina falconensis; Globigerina humilis; Globigerina quinqueloba; Globigerina rubescens; Globigerinella adamsi; Globigerinella aequilateralis; Globigerinella calida; Globigerinita bradyi; Globigerinita glutinata; Globigerinita iota; Globigerinita pumilio; Globigerinoides conglobatus; Globigerinoides ruber; Globigerinoides sacculifer; Globigerinoides tenellus; Globoquadrina conglomerata; Globoquadrina hexagona; Globorotalia anfracta; Globorotalia crassaformis; Globorotalia hirsuta; Globorotalia inflata; Globorotalia menardii; Globorotalia scitula; Globorotalia truncatulinoides dextral; Globorotalia truncatulinoides sinistral; Globorotalia tumida; Gravity corer; Hastigerina digitata; Hastigerina pelagica; Latitude of event; Longitude of event; Neogloboquadrina dutertrei; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma dextral and dutertrei integrade; Neogloboquadrina pachyderma sinistral; Oridorsalis umbonatus; PC; Piston corer; Pulleniatina obliquiloculata; RC08; RC08-78; RC13; RC13-38; Robert Conrad; South Pacific; Southwest Pacific Ocean; Sphaeroidinella dehiscens; Z2108
    Type: Dataset
    Format: text/tab-separated-values, 390 data points
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  • 7
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    Reconstruction of sea-surface temperatures from asseblages of planktonic foraminifera (2005)
    PANGAEA
    In:  Supplement to: Kucera, Michal; Weinelt, Mara; Kiefer, Thorsten; Pflaumann, Uwe; Hayes, Angela; Weinelt, Martin; Chen, Min-Te; Mix, Alan C; Barrows, Timothy T; Cortijo, Elsa; Duprat, Josette M; Juggins, Stephen; Waelbroeck, Claire (2005): Reconstruction of sea-surface temperatures from assemblages of planktonic foraminifera: multi-technique approach based on geographically constrained calibration datasets and its application to glacial Atlantic and Pacific Oceans. Quaternary Science Reviews, 24(7-9), 951-998, https://doi.org/10.1016/j.quascirev.2004.07.014
    Details
    Publication Date: 2023-11-25
    Description: We present a conceptual framework for a new approach to environmental calibration of planktonic foraminifer census counts. This approach is based on simultaneous application of a variety of transfer function techniques, which are trained on geographically constrained calibration data sets. It serves to minimise bias associated with the presence of cryptic species of planktonic foraminifera and provides an objective tool for assessing reliability of environmental estimates in fossil samples, allowing identification of adverse effects of no-analog faunas and technique-specific bias. We have compiled new calibration data sets for the North (N=862) and South (N=321) Atlantic and the Pacific Ocean (N=1111). We show evidence that these data sets offer adequate coverage of the Sea-Surface Temperature (SST) and faunal variation range and that they are not affected by the presence of pre-Holocene samples and/or calcite dissolution. We have applied four transfer function techniques, including Artificial Neural Networks, Revised Analog Method and SIMMAX (with and without distance weighting) on faunal counts in a Last Glacial Maximum (LGM) data set for the Atlantic Ocean (748 samples in 167 cores; based on the GLAMAP-2000 compilation) and a new data set for the Pacific Ocean (265 samples in 82 cores) and show that three of these techniques provide adequate degree of independence for the advantage of a multi-technique approach to be realised. The application of our new approach to the glacial Pacific lends support to the contraction and perhaps even a cooling of the Western Pacific Warm Pool and a substantial (〉3 °C) cooling of the eastern equatorial Pacific and the eastern boundary currents. Our results do not provide conclusive evidence for LGM warming anywhere in the Pacific. The Atlantic reconstruction shows a number of robust patterns, including substantial cooling of eastern boundary currents with considerable advection of subpolar waters into the Benguela Current, a cooling of the equatorial Atlantic by ~5 °C, and steep SST gradients in the mid-latitude North Atlantic. The transfer function techniques generally agree that subtropical gyre areas in both hemispheres did not change significantly since the LGM, although the ANN technique produced glacial SST in the southern gyre 1-2 °C warmer than today. We have revisited the issue of sea-ice occurrence in the Nordic Seas and using the distribution of subpolar species of planktonic foraminifera in glacial samples, we conclude that the Norwegian Sea must have been ice-free during the summer.
    Keywords: MARGO; Multiproxy Approach for the Reconstruction of the Glacial Ocean surface
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 8
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    Various paleoclimate proxy parameters compiled within the MARGO project (2011)
    PANGAEA
    Details
    Publication Date: 2023-11-25
    Description: This datasets includes paleoclimate proxy parameters compiled within the MARGO project.
    Keywords: LIT; Literary studies; MARGO; MARGO_0000; Multiproxy Approach for the Reconstruction of the Glacial Ocean surface
    Type: Dataset
    Format: application/zip, 7 datasets
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  • 9
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    Compilation of planktic foraminifera census data, modern from the Pacific Ocean (2005)
    PANGAEA
    Details
    Publication Date: 2023-11-25
    Keywords: MARGO; Multiproxy Approach for the Reconstruction of the Glacial Ocean surface
    Type: Dataset
    Format: application/vnd.ms-excel, 2 MBytes
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  • 10
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    Compilation of planktic foraminifera census data, modern from the Atlantic Ocean (2005)
    PANGAEA
    Details
    Publication Date: 2023-11-25
    Keywords: MARGO; Multiproxy Approach for the Reconstruction of the Glacial Ocean surface
    Type: Dataset
    Format: application/vnd.ms-excel, 859 kBytes
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