气候变化领域集成服务门户(CCPortal): Polar amplification of Pliocene climate by elevated trace gas radiative forcing

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DOI	10.1073/pnas.2002320117
	Polar amplification of Pliocene climate by elevated trace gas radiative forcing
	Hopcroft P.O.; Ramstein G.; Pugh T.A.M.; Hunter S.J.; Murguia-Flores F.; Quiquet A.; Sun Y.; Tan N.; Valdes P.J.
发表日期	2020
ISSN	0027-8424
起始页码	23401
结束页码	23407
卷号	117 期号:38
英文摘要	Warm periods in Earth's history offer opportunities to understand the dynamics of the Earth system under conditions that are similar to those expected in the near future. The Middle Pliocene warm period (MPWP), from 3.3 to 3.0 My B.P, is the most recent time when atmospheric CO2levels were as high as today. However, climate model simulations of the Pliocene underestimate highlatitude warming that has been reconstructed from fossil pollen samples and other geological archives. One possible reason for this is that enhanced non-CO2trace gas radiative forcing during the Pliocene, including from methane (CH4), has not been included in modeling. We use a suite of terrestrial biogeochemistry models forced with MPWP climate model simulations from four different climate models to produce a comprehensive reconstruction of the MPWP CH4cycle, including uncertainty. We simulate an atmospheric CH4mixing ratio of 1,000 to 1,200 ppbv, which in combination with estimates of radiative forcing from N2O and O3, contributes a non-CO2radiative forcing of 0.9 Wm-2(range 0.6 to 1.1), which is 43% (range 36 to 56%) of the CO2radiative forcing used in MPWP climate simulations. This additional forcing would cause a global surface temperature increase of 0.6 to 1.0 °C, with amplified changes at high latitudes, improving agreement with geological evidence of Middle Pliocene climate. We conclude that natural trace gas feedbacks are critical for interpreting climate warmth during the Pliocene and potentially many other warm phases of the Cenezoic. These results also imply that using Pliocene CO2and temperature reconstructions alone may lead to overestimates of the fast or Charney climate sensitivity. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Biogeochemistry; GCM; Methane; Pliocene; Trace gas; Wetland
语种	英语
scopus关键词	methane; organic compound; Article; biogeochemistry; climate; climate resilience; climate warming; computer simulation; ecosystem; environmental parameters; feedback system; image reconstruction; mathematical model; Middle Pliocene warm period; molecular dynamics; oxidation; Pliocene; precipitation; priority journal; radiative forcing; temperature; vegetation; warming; wetland
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160221
作者单位	Hopcroft, P.O., School of Geography, Earth & Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, United Kingdom; Ramstein, G., Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre Simon Laplace, Commissariat À l'Énergie Atomique et Aux Énergies Alternatives-Centre National, Recherche Scientifique-Université de Saint-Quentin en Yvelines, Université Paris-Saclay, Gif-sur-Yvette, F-91191, France; Pugh, T.A.M., School of Geography, Earth & Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, United Kingdom, Birmingham Institute of Forest Research, University of Birmingham, Birmingham, B15 2TT, United Kingdom; Hunter, S.J., School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; Murguia-Flores, F., Bristol Research Initiative for the Dynamic Global Environment, School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS, United Kingdom, Instituto de Investigaciones en Ecosistemas y Sustentabilidad, Universidad ...
推荐引用方式 GB/T 7714	Hopcroft P.O.,Ramstein G.,Pugh T.A.M.,et al. Polar amplification of Pliocene climate by elevated trace gas radiative forcing[J],2020,117(38).
APA	Hopcroft P.O..,Ramstein G..,Pugh T.A.M..,Hunter S.J..,Murguia-Flores F..,...&Valdes P.J..(2020).Polar amplification of Pliocene climate by elevated trace gas radiative forcing.Proceedings of the National Academy of Sciences of the United States of America,117(38).
MLA	Hopcroft P.O.,et al."Polar amplification of Pliocene climate by elevated trace gas radiative forcing".Proceedings of the National Academy of Sciences of the United States of America 117.38(2020).