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Precise interpolar phasing of abrupt climate change during the last ice age

机译：在上一个冰河时代，精确的极间相位突变突变

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摘要

The last glacial period exhibited abrupt Dansgaard-Oeschger climatic oscillations, evidence of which is preserved in a variety of Northern Hemisphere palaeodimate archives'. Ice cores show that Antarctica cooled during the warm phases of the Greenland Dansgaard-Oeschger cycle and vice versa''', suggesting an interhemispheric redistribution of heat through a mechanism called the bipolar seesaw(4-6). Variations in the Atlantic meridional overturning circulation (AMOC) strength are thought to have been important, but much uncertainty remains regarding the dynamics and trigger of these abrupt events'. Key information is contained in the relative phasing of hemispheric climate variations, yet the large, poorly constrained difference between gas age and ice age and the relatively low resolution of methane records from Antarctic ice cores have so far precluded methane-based synchronization at the required sub-centennial precision''''". Here we use a recently drilled high-accumulation Antarctic ice core to show that, on average, abrupt Greenland warming leads the corresponding Antarctic cooling onset by 218 +/- 92 years (2 sigma a) for DansgaardOeschger events, including the Bolling event; Greenland cooling leads the corresponding onset of Antarctic warming by 208 +/- 96 years. Our results demonstrate a north-to-south directionality of the abrupt climatic signal, which is propagated to the Southern Hemisphere high latitudes by oceanic rather than atmospheric processes. The similar interpolar phasing of warming and cooling transitions suggests that the transfer time of the climatic signal is independent of the AMOC background state. Our findings confirm a central role for ocean circulation in the bipolar seesaw and provide clear criteria for assessing hypotheses and model simulations of Dansgaard-Oeschger dynamics.
机译：最后一个冰川期出现了Dansgaard-Oeschger突变的气候振荡，其证据被保存在北半球古生物的各种档案中。冰芯表明，南极洲在格陵兰岛Dansgaard-Oeschger循环的暖期期间冷却，反之亦然，''这表明通过称为双极跷跷板（4-6）的机制进行了半球间热量的重新分配。人们认为大西洋子午向上翻转环流（AMOC）强度的变化很重要，但是这些突变事件的动力学和触发因素仍然存在很多不确定性。关键信息包含在半球气候变化的相对阶段中，但迄今为止，天然气年龄和冰河年龄之间的差异较大，约束较差，并且南极冰芯的甲烷记录分辨率相对较低，到目前为止，仍无法在所需子区域进行基于甲烷的同步化百年精度”''”。这里我们使用最近钻出的高积聚南极冰芯来表明，格陵兰岛突然变暖平均导致对应的南极降温开始时间为218 +/- 92年（2σ）。 DansgaardOeschger事件，包括Bolling事件；格陵兰的降温导致相应的南极变暖发生208 +/- 96年，我们的结果表明了突变的气候信号从北向南的方向性，并传播到南半球高纬度地区通过海洋而不是大气过程进行的相似的变暖和变冷的极间阶段表明，气候信号的传递时间l独立于AMOC背景状态。我们的发现证实了双极跷跷板中海洋循环的核心作用，并为评估Dansgaard-Oeschger动力学的假设和模型模拟提供了明确的标准。

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  • 来源
    《Nature》 |2015年第7549期|661-665|共5页
  • 作者

    Buizert Christo; Adrian Betty; Ahn Jinho; Albert Mary; Alley Richard B.; Baggenstos Daniel; Bauska Thomas K.; Bay Ryan C.; Bencivengo Brian B.; Bentley Charles R.; Brook Edward J.; Chellman Nathan J.; Clow Gary D.; Cole-Dai Jihong; Conway Howard; Cravens Eric; Cuffey Kurt M.; Dunbar Nelia W.; Edwards Jon S.; Fegyveresi John M.; Ferris Dave G.; Fitzpatrick Joan J.; Fudge T. J.; Gibson Chris J.; Gkinis Vasileios; Goetz Joshua J.; Gregory Stephanie; Hargreaves Geoffrey M.; Iverson Nels; Johnson Jay A.; Jones Tyler R.; Kalk Michael L.; Kippenhan Matthew J.; Koffman Bess G.; Kreutz Karl; Kuhl Tanner W.; Lebar Donald A.; Lee James E.; Marcott Shaun A.; Markle Bradley R.; Maselli Olivia J.; McConnell Joseph R.; McGwire Kenneth C.; Mitchell Logan E.; Mortensen Nicolai B.; Neff Peter D.; Nishiizumi Kunihiko; Nunn Richard M.; Orsi Anais J.; Pasteris Daniel R.; Pedro Joel B.; Pettit Erin C.; Price P. Buford; Priscu John C.; Rhodes Rachael H.; Rosen Julia L.; Schauer Andrew J.; Schoenemann Spruce W.; Sendelbach Paul J.; Severinghaus Jeffrey P.; Shturmakov Alexander J.; Sigl Michael; Slawny Kristina R.; Souney Joseph M.; Sowers Todd A.; Spencer Matthew K.; Steig Eric J.; Taylor Kendrick C.; Twickler Mark S.; Vaughn Bruce H.; Voigt Donald E.; Waddington Edwin D.; Welten Kees C.; Wendricks Anthony W.; White James W. C.; Winstrup Mai; Wong Gifford J.; Woodruff Thomas E.;

  • 作者单位

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    US Geol Survey, Natl Ice Core Lab, Denver, CO 80225 USA;

    Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 151742, South Korea;

    Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA;

    Penn State Univ, Dept Geosci, University Pk, PA 16802 USA;

    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    US Geol Survey, Natl Ice Core Lab, Denver, CO 80225 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA;

    US Geol Survey, Boulder, CO 80309 USA;

    S Dakota State Univ, Dept Chem & Biochem, Brookings, SD 57007 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;

    ADC Management Serv, Lakewood, CO 80226 USA;

    Univ Calif Berkeley, Dept Geog, Berkeley, CA 94709 USA;

    New Mexico Inst Min & Technol, Earth & Environm Sci Dept, Socorro, NM 87801 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Penn State Univ, Dept Geosci, University Pk, PA 16802 USA;

    S Dakota State Univ, Dept Chem & Biochem, Brookings, SD 57007 USA;

    US Geol Survey, Denver, CO 80225 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA|Univ Copenhagen, Ctr Ice & Climate, DK-2100 Copenhagen O, Denmark;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA;

    US Geol Survey, Natl Ice Core Lab, Denver, CO 80225 USA;

    New Mexico Inst Min & Technol, Earth & Environm Sci Dept, Socorro, NM 87801 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Antarctic Support Contract, Lockheed Martin US Antarctic Program, Centennial, CO 80112 USA;

    Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA;

    Univ Maine, Climate Change Inst, Orono, ME 04469 USA|Univ Maine, Sch Earth & Climate Sci, Orono, ME 04469 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA|Univ Wisconsin, Madison, WI 53706 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;

    Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA;

    Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA;

    Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Victoria Univ Wellington, Antarctic Res Ctr, Wellington 6012, New Zealand;

    Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA;

    US Geol Survey, Natl Ice Core Lab, Denver, CO 80225 USA;

    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA|Inst Pierre Simon Laplace, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France;

    Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA;

    Univ Copenhagen, Ctr Ice & Climate, DK-2100 Copenhagen O, Denmark|Univ Washington, Joint Inst Study Atmosphere & Oceans, Seattle, WA 98195 USA;

    Univ Alaska Fairbanks, Dept Geosci, Fairbanks, AK 99775 USA;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    Montana State Univ, Dept Land Resources & Environm Sci, Bozeman, MT 59717 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA;

    Penn State Univ, Dept Geosci, University Pk, PA 16802 USA;

    Lake Super State Univ, Sch Phys Sci, Sault Sainte Marie, MI 49783 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;

    Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA;

    Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA;

    Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA;

    Penn State Univ, Dept Geosci, University Pk, PA 16802 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;

    Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA;

    Univ Wisconsin, Ice Drilling Design & Operat, Madison, WI 53706 USA;

    Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA;

    Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA|Univ Copenhagen, Ctr Ice & Climate, DK-2100 Copenhagen O, Denmark;

    Dartmouth Coll, Dept Earth Sci, Hanover, NH 03755 USA;

    Purdue Univ, PRIME Lab, W Lafayette, IN 47907 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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