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Titel |
Intensification of the meridional temperature gradient in the Great Barrier Reef following the Last Glacial Maximum - Results from IODP Expedition 325 |
VerfasserIn |
Thomas Felis, Helen V. McGregor, Braddock K. Linsley, Alexander W. Tudhope, Michael K. Gagan, Atsushi Suzuki, Mayuri Inoue, Alexander L. Thomas, Tezer M. Esat, William G. Thompson, Manish Tiwari, Donald C. Potts, Manfred Mudelsee, Yusuke Yokoyama, Jody M. Webster |
Konferenz |
EGU General Assembly 2015
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 17 (2015) |
Datensatznummer |
250110116
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Publikation (Nr.) |
EGU/EGU2015-10089.pdf |
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Zusammenfassung |
Tropical south-western Pacific temperatures are of vital importance to the Great Barrier Reef
(GBR), but the role of sea surface temperatures (SSTs) in the growth of the GBR since the
Last Glacial Maximum remains largely unknown. Here we present records of Sr/Ca and
δ18O for Last Glacial Maximum and deglacial corals that were drilled by Integrated
Ocean Drilling Program (IODP) Expedition 325 along the shelf edge seaward of
the modern GBR. The Sr/Ca and δ18O records of the precisely U-Th dated fossil
shallow-water corals show a considerably steeper meridional SST gradient than the present
day in the central GBR. We find a 1–2 Ë C larger temperature decrease between
17Ë S and 20Ë S about 20,000 to 13,000 years ago. The result is best explained by
the northward expansion of cooler subtropical waters due to a weakening of the
South Pacific gyre and East Australian Current. Our findings indicate that the GBR
experienced substantial and regionally differing temperature change during the last
deglaciation, much larger temperature changes than previously recognized. Furthermore,
our findings suggest a northward contraction of the Western Pacific Warm Pool
during the LGM and last deglaciation, and serve to explain anomalous drying of
northeastern Australia at that time. Overall, the GBR developed through significant SST
change and, considering temperature alone, may be more resilient than previously
thought.
Webster, J. M., Yokoyama, Y. & Cotteril, C. & the Expedition 325 Scientists. Proceedings
of the Integrated Ocean Drilling Program Vol. 325 (Integrated Ocean Drilling Program
Management International Inc., 2011).
Felis, T., McGregor, H. V., Linsley, B. K., Tudhope, A. W., Gagan, M. K., Suzuki, A.,
Inoue, M., Thomas, A. L., Esat, T. M., Thompson, W. G., Tiwari, M., Potts, D. C., Mudelsee,
M., Yokoyama, Y., Webster, J. M. Intensification of the meridional temperature gradient in
the Great Barrier Reef following the Last Glacial Maximum. Nature Communications 5,
4102, doi:10.1038/ncomms5102 (2014). |
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