ORCID Profile
0000-0001-9486-6275
Current Organisation
Uppsala University
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Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-12-2011
Abstract: Antarctica glaciation began soon after a large decrease in the concentration of atmospheric carbon dioxide around 35 million years ago.
Publisher: American Geophysical Union (AGU)
Date: 03-2017
DOI: 10.1002/2016GC006715
Publisher: Elsevier BV
Date: 10-2018
Publisher: American Geophysical Union (AGU)
Date: 10-2020
DOI: 10.1029/2020PA003872
Abstract: Ocean gateways facilitate circulation between ocean basins, thereby impacting global climate. The Indonesian Gateway transports water from the Pacific to the Indian Ocean via the Indonesian Throughflow (ITF) and drives the strength and intensity of the modern Leeuwin Current, which carries warm equatorial waters along the western coast of Australia to higher latitudes. Therefore, ITF dynamics are a vital component of global thermohaline circulation. Plio‐Pleistocene changes in ITF behavior and Leeuwin Current intensity remain poorly constrained due to a lack of sedimentary records from regions under its influence. Here, organic geochemical proxies are used to reconstruct sea surface temperatures on the northwest Australian shelf at IODP Site U1463, downstream of the ITF outlet and under the influence of the Leeuwin Current. Our records, based on TEX 86 and the long‐chain diol index, provide insight into past ITF variability (3.5–1.5 Ma) and confirm that sea surface temperature exerted a control on Australian continental hydroclimate. A significant TEX 86 cooling of ~5°C occurs within the mid‐Pliocene Warm Period (3.3–3.1 Ma) suggesting that this interval was characterized by SST fluctuations at Site U1463. A major feature of both the TEX 86 and long‐chain diol index records is a strong cooling from ~1.7 to 1.5 Ma. We suggest that this event reflects a reduction in Leeuwin Current intensity due to a major step in ongoing ITF constriction, accompanied by a switch from South to North Pacific source waters entering the ITF inlet. Our new data suggest that an additional ITF constriction event may have occurred in the Pleistocene.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-05-2017
Abstract: Sediments from Western Australia show how westerly winds made the southwest wetter during the Miocene (18 to 6 million years ago).
Publisher: Elsevier BV
Date: 09-2012
Publisher: Springer Science and Business Media LLC
Date: 02-09-2019
DOI: 10.1038/S41597-019-0173-8
Abstract: Rapid changes in ocean circulation and climate have been observed in marine-sediment and ice cores over the last glacial period and deglaciation, highlighting the non-linear character of the climate system and underlining the possibility of rapid climate shifts in response to anthropogenic greenhouse gas forcing. To date, these rapid changes in climate and ocean circulation are still not fully explained. One obstacle hindering progress in our understanding of the interactions between past ocean circulation and climate changes is the difficulty of accurately dating marine cores. Here, we present a set of 92 marine sediment cores from the Atlantic Ocean for which we have established age-depth models that are consistent with the Greenland GICC05 ice core chronology, and computed the associated dating uncertainties, using a new deposition modeling technique. This is the first set of consistently dated marine sediment cores enabling paleoclimate scientists to evaluate leads/lags between circulation and climate changes over vast regions of the Atlantic Ocean. Moreover, this data set is of direct use in paleoclimate modeling studies.
Publisher: American Geophysical Union (AGU)
Date: 07-07-2017
DOI: 10.1002/2017GL072977
Publisher: Elsevier BV
Date: 08-2015
Publisher: Elsevier BV
Date: 11-2018
Publisher: American Geophysical Union (AGU)
Date: 04-2019
DOI: 10.1029/2018PA003512
Publisher: Elsevier BV
Date: 04-2005
Start Date: 2017
End Date: 2019
Funder: Japan Society for the Promotion of Science
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