Obliquity-driven expansion of North Atlantic sea ice during the last glacial
North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard‐Oeschger (D‐O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 cal years ago (23 to 19 ka), no D‐O events are obser...
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| Veröffentlicht in: | Geophysical research letters 2015-12, Vol.42 (23), p.10,382-10,390 |
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| creator | Turney, Chris S. M. Thomas, Zoë A. Hutchinson, David K. Bradshaw, Corey J. A. Brook, Barry W. England, Matthew H. Fogwill, Christopher J. Jones, Richard T. Palmer, Jonathan Hughen, Konrad A. Cooper, Alan |
| description | North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard‐Oeschger (D‐O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 cal years ago (23 to 19 ka), no D‐O events are observed in the Greenland ice cores. Our new analysis of the Greenland δ18O record reveals a switch in the stability of the climate system around 30 ka, suggesting that a critical threshold was passed. Climate system modeling suggests that low axial obliquity at this time caused vastly expanded sea ice in the Labrador Sea, shifting Northern Hemisphere westerly winds south and reducing the strength of meridional overturning circulation. The results suggest that these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM.
Key Points
The climate system switched from a bistable to monostable state around 30 ka
Early warning signals of this bifurcation are detected in δ18O ice core data
Low obliquity caused greatly expanded sea ice in the Labrador Sea |
| doi_str_mv | 10.1002/2015GL066344 |
| format | Article |
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Key Points
The climate system switched from a bistable to monostable state around 30 ka
Early warning signals of this bifurcation are detected in δ18O ice core data
Low obliquity caused greatly expanded sea ice in the Labrador Sea</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1002/2015GL066344</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>abrupt climate change ; Atlantic Meridional Overturning Circulation (AMOC) ; Brackish ; Circulation ; Climate ; Climate models ; Climate system ; Cores ; Duration ; Expansion ; geochronology ; Geophysics ; Greenland ice cores ; Growth ; Ice ages ; Ice cores ; Labrador ; Last Glacial Maximum ; late Pleistocene ; Marine ; meridional overturning circulation ; Modelling ; Northern Hemisphere ; Obliquity ; Ocean circulation ; Oscillations ; Pleistocene ; Sea ice ; Stability ; Strength ; Switches ; tipping point ; Warning ; Wind ; Winds</subject><ispartof>Geophysical research letters, 2015-12, Vol.42 (23), p.10,382-10,390</ispartof><rights>2015. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a6350-afe2a776b1b7dd82cfb159289a4665a0c0b36dc0f6e11bb64eec2797f170010e3</citedby><cites>FETCH-LOGICAL-a6350-afe2a776b1b7dd82cfb159289a4665a0c0b36dc0f6e11bb64eec2797f170010e3</cites><orcidid>0000-0001-6733-0993</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2015GL066344$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2015GL066344$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1416,1432,11513,27923,27924,45573,45574,46408,46467,46832,46891</link.rule.ids></links><search><creatorcontrib>Turney, Chris S. M.</creatorcontrib><creatorcontrib>Thomas, Zoë A.</creatorcontrib><creatorcontrib>Hutchinson, David K.</creatorcontrib><creatorcontrib>Bradshaw, Corey J. A.</creatorcontrib><creatorcontrib>Brook, Barry W.</creatorcontrib><creatorcontrib>England, Matthew H.</creatorcontrib><creatorcontrib>Fogwill, Christopher J.</creatorcontrib><creatorcontrib>Jones, Richard T.</creatorcontrib><creatorcontrib>Palmer, Jonathan</creatorcontrib><creatorcontrib>Hughen, Konrad A.</creatorcontrib><creatorcontrib>Cooper, Alan</creatorcontrib><title>Obliquity-driven expansion of North Atlantic sea ice during the last glacial</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard‐Oeschger (D‐O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 cal years ago (23 to 19 ka), no D‐O events are observed in the Greenland ice cores. Our new analysis of the Greenland δ18O record reveals a switch in the stability of the climate system around 30 ka, suggesting that a critical threshold was passed. Climate system modeling suggests that low axial obliquity at this time caused vastly expanded sea ice in the Labrador Sea, shifting Northern Hemisphere westerly winds south and reducing the strength of meridional overturning circulation. The results suggest that these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM.
Key Points
The climate system switched from a bistable to monostable state around 30 ka
Early warning signals of this bifurcation are detected in δ18O ice core data
Low obliquity caused greatly expanded sea ice in the Labrador Sea</description><subject>abrupt climate change</subject><subject>Atlantic Meridional Overturning Circulation (AMOC)</subject><subject>Brackish</subject><subject>Circulation</subject><subject>Climate</subject><subject>Climate models</subject><subject>Climate system</subject><subject>Cores</subject><subject>Duration</subject><subject>Expansion</subject><subject>geochronology</subject><subject>Geophysics</subject><subject>Greenland ice cores</subject><subject>Growth</subject><subject>Ice ages</subject><subject>Ice cores</subject><subject>Labrador</subject><subject>Last Glacial Maximum</subject><subject>late Pleistocene</subject><subject>Marine</subject><subject>meridional overturning circulation</subject><subject>Modelling</subject><subject>Northern Hemisphere</subject><subject>Obliquity</subject><subject>Ocean circulation</subject><subject>Oscillations</subject><subject>Pleistocene</subject><subject>Sea ice</subject><subject>Stability</subject><subject>Strength</subject><subject>Switches</subject><subject>tipping point</subject><subject>Warning</subject><subject>Wind</subject><subject>Winds</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNqF0cFO3DAQBmCraqVut731ASz10kMDM3ZiJ0eEyoKIAG1bcbQcZwKmIVnsBNi3r9EiVPVAfRkfvrH_0TD2GWEPAcS-ACxWNSgl8_wNW2CV51kJoN-yBUCV7kKr9-xDjDcAIEHigtXnTe_vZj9tszb4exo4PW7sEP048LHjZ2OYrvnB1Nth8o5Hstw74u0c_HDFp2vivY0Tv-qt87b_yN51to_06bku2a-j7z8Pj7P6fHVyeFBnVskCMtuRsFqrBhvdtqVwXYNFJcrK5koVFhw0UrUOOkWITaNyIid0pTvUAAgkl-zr7t1NGO9mipO59dFRn1LSOEeDaei81Ijy_zTlSEeiTvTLP_RmnMOQBjFYIZRK6gpeVbqQOleQypJ92ykXxhgDdWYT_K0NW4NgnnZl_t5V4mLHH3xP21etWa3r9E3xlCTbNfk40eNLkw2_jdJJmMuzlUF1sT79cbE2Qv4B6HWhQw</recordid><startdate>20151216</startdate><enddate>20151216</enddate><creator>Turney, Chris S. M.</creator><creator>Thomas, Zoë A.</creator><creator>Hutchinson, David K.</creator><creator>Bradshaw, Corey J. A.</creator><creator>Brook, Barry W.</creator><creator>England, Matthew H.</creator><creator>Fogwill, Christopher J.</creator><creator>Jones, Richard T.</creator><creator>Palmer, Jonathan</creator><creator>Hughen, Konrad A.</creator><creator>Cooper, Alan</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>7UA</scope><scope>C1K</scope><orcidid>https://orcid.org/0000-0001-6733-0993</orcidid></search><sort><creationdate>20151216</creationdate><title>Obliquity-driven expansion of North Atlantic sea ice during the last glacial</title><author>Turney, Chris S. M. ; Thomas, Zoë A. ; Hutchinson, David K. ; Bradshaw, Corey J. 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M.</creatorcontrib><creatorcontrib>Thomas, Zoë A.</creatorcontrib><creatorcontrib>Hutchinson, David K.</creatorcontrib><creatorcontrib>Bradshaw, Corey J. A.</creatorcontrib><creatorcontrib>Brook, Barry W.</creatorcontrib><creatorcontrib>England, Matthew H.</creatorcontrib><creatorcontrib>Fogwill, Christopher J.</creatorcontrib><creatorcontrib>Jones, Richard T.</creatorcontrib><creatorcontrib>Palmer, Jonathan</creatorcontrib><creatorcontrib>Hughen, Konrad A.</creatorcontrib><creatorcontrib>Cooper, Alan</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Turney, Chris S. M.</au><au>Thomas, Zoë A.</au><au>Hutchinson, David K.</au><au>Bradshaw, Corey J. A.</au><au>Brook, Barry W.</au><au>England, Matthew H.</au><au>Fogwill, Christopher J.</au><au>Jones, Richard T.</au><au>Palmer, Jonathan</au><au>Hughen, Konrad A.</au><au>Cooper, Alan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Obliquity-driven expansion of North Atlantic sea ice during the last glacial</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2015-12-16</date><risdate>2015</risdate><volume>42</volume><issue>23</issue><spage>10,382</spage><epage>10,390</epage><pages>10,382-10,390</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>North Atlantic late Pleistocene climate (60,000 to 11,650 years ago) was characterized by abrupt and extreme millennial duration oscillations known as Dansgaard‐Oeschger (D‐O) events. However, during the Last Glacial Maximum (LGM) 23,000 to 19,000 cal years ago (23 to 19 ka), no D‐O events are observed in the Greenland ice cores. Our new analysis of the Greenland δ18O record reveals a switch in the stability of the climate system around 30 ka, suggesting that a critical threshold was passed. Climate system modeling suggests that low axial obliquity at this time caused vastly expanded sea ice in the Labrador Sea, shifting Northern Hemisphere westerly winds south and reducing the strength of meridional overturning circulation. The results suggest that these feedbacks tipped the climate system into full glacial conditions, leading to maximum continental ice growth during the LGM.
Key Points
The climate system switched from a bistable to monostable state around 30 ka
Early warning signals of this bifurcation are detected in δ18O ice core data
Low obliquity caused greatly expanded sea ice in the Labrador Sea</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2015GL066344</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0001-6733-0993</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Geophysical research letters, 2015-12, Vol.42 (23), p.10,382-10,390 |
| issn | 0094-8276 1944-8007 |
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| source | Wiley Online Library Journals Frontfile Complete; Wiley Free Content; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals |
| subjects | abrupt climate change Atlantic Meridional Overturning Circulation (AMOC) Brackish Circulation Climate Climate models Climate system Cores Duration Expansion geochronology Geophysics Greenland ice cores Growth Ice ages Ice cores Labrador Last Glacial Maximum late Pleistocene Marine meridional overturning circulation Modelling Northern Hemisphere Obliquity Ocean circulation Oscillations Pleistocene Sea ice Stability Strength Switches tipping point Warning Wind Winds |
| title | Obliquity-driven expansion of North Atlantic sea ice during the last glacial |
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