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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00005112naa a2200433 4500
001oai:DiVA.org:uu-332420
003SwePub
008171102s2017 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3324202 URI
0247 a https://doi.org/10.1002/2017GL0729772 DOI
040 a (SwePub)uu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Christensen, Beth A.u Adelphi Univ, Environm Studies Program, Garden City, NY 11530 USA.4 aut
2451 0a Indonesian Throughflow drove Australian climate from humid Pliocene to arid Pleistocene
264 1c 2017
338 a print2 rdacarrier
520 a Late Miocene to mid-Pleistocene sedimentary proxy records reveal that northwest Australia underwent an abrupt transition from dry to humid climate conditions at 5.5 million years (Ma), likely receiving year-round rainfall, but after similar to 3.3 Ma, climate shifted toward an increasingly seasonal precipitation regime. The progressive constriction of the Indonesian Throughflow likely decreased continental humidity and transferred control of northwest Australian climate from the Pacific to the Indian Ocean, leading to drier conditions punctuated by monsoonal precipitation. The northwest dust pathway and fully established seasonal and orbitally controlled precipitation were in place by similar to 2.4 Ma, well after the intensification of Northern Hemisphere glaciation. The transition from humid to arid conditions was driven by changes in Pacific and Indian Ocean circulation and regional atmospheric moisture transport, influenced by the emerging Maritime Continent. We conclude that the Maritime Continent is the switchboard modulating teleconnections between tropical and high-latitude climate systems. Plain Language Summary Australia is themost arid habitable continent on earth, however its climate is capable of dramatic changewith seasonalmonsoon rains in the otherwise arid northwest. We analyzed natural gamma radiation in a recently drilled borehole (IODP Expedition 356 Site U1463) off NW Australia to examine long-term climate changes over the last 6 million years. Based on variations in potassium, thorium and uranium, as well as common clay minerals, we show that the NW continent was more humid during the Pliocene period, between similar to 5.5 and 3.3 million years ago (Humid Interval), and became arid by the early Pleistocene, similar to 2.4 million years ago (Arid Interval). We attribute the Humid Interval to an expansion of warm surface waters in the western Pacific, supplying warm and moist air to the continent. As Australia moved north, the Maritime Continent (islands to the north) emerged, restricting the flow of warm surface currents from the Pacific (Indonesian Throughflow), resulting in drier conditions on land. The Arid Interval ushered in amodern-like Australian climate, with seasonal rainfall and dust storms, and a more modern Indian Ocean circulation. Our results show that the Maritime Continent is an important control on both Australian climate and Indian Ocean circulation.
650 7a NATURVETENSKAPx Geovetenskap och miljövetenskapx Geologi0 (SwePub)105042 hsv//swe
650 7a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Geology0 (SwePub)105042 hsv//eng
7001 a Renema, Willemu Naturalis Biodivers Ctr, Leiden, Netherlands.4 aut
7001 a Henderiks, Jorijntjeu Uppsala universitet,Paleobiologi4 aut0 (Swepub:uu)jorhe564
7001 a De Vleeschouwer, Davidu Univ Bremen, MARUM Ctr Marine & Environm Sci, Bremen, Germany.;Univ Bremen, Dept Geosci, Bremen, Germany.4 aut
7001 a Groeneveld, Jeroenu Univ Bremen, MARUM Ctr Marine & Environm Sci, Bremen, Germany.;Univ Bremen, Dept Geosci, Bremen, Germany.4 aut
7001 a Castaneda, Isla S.u Univ Massachusetts, Dept Geosci, Amherst, MA 01003 USA.4 aut
7001 a Reuning, Larsu Univ Aachen, Geol Inst RWTH, Energy & Mineral Resources Grp, Aachen, Germany.4 aut
7001 a Bogus, Karau Texas A&M Univ, Int Ocean Discovery Program, College Stn, TX USA.4 aut
7001 a Auer, Geraldu Karl Franzens Univ Graz, Inst Earth Sci, Graz, Austria.4 aut
7001 a Ishiwa, Takeshigeu Univ Tokyo, Atmosphere & Ocean Res Inst, Chiba, Japan.;Natl Inst Polar Res, Tokyo, Japan.4 aut
7001 a McHugh, Cecilia M.u CUNY Queens Coll, Sch Earth & Environm Sci, Flushing, NY 11367 USA.4 aut
7001 a Gallagher, Stephen J.u Univ Melbourne, Sch Earth Sci, Melbourne, Vic, Australia.4 aut
7001 a Fulthorpe, Craig S.u Univ Texas Austin, Inst Geophys, Jackson Sch Geosci, Austin, TX USA.4 aut
7102 a Adelphi Univ, Environm Studies Program, Garden City, NY 11530 USA.b Naturalis Biodivers Ctr, Leiden, Netherlands.4 org
7730 t Geophysical Research Lettersg 44:13, s. 6914-6925q 44:13<6914-6925x 0094-8276x 1944-8007
8564 u https://doi.org/10.1002/2017GL072977y Fulltext
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332420
8564 8u https://doi.org/10.1002/2017GL072977

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