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dc.contributor.authorJoshi, Manoj
dc.contributor.authorvon Glasow, Roland
dc.contributor.authorSmith, Robin S.
dc.contributor.authorPaxton, Charles G. M.
dc.contributor.authorMaycock, Amanda C.
dc.contributor.authorLunt, Daniel J.
dc.contributor.authorLoptson, Claire
dc.contributor.authorMarkwick, Paul
dc.identifier.citationJoshi , M , von Glasow , R , Smith , R S , Paxton , C G M , Maycock , A C , Lunt , D J , Loptson , C & Markwick , P 2017 , ' Global warming and ocean stratification : a potential result of large extraterrestrial impacts ' , Geophysical Research Letters , vol. 44 , no. 8 , pp. 3841-3848 .
dc.identifier.otherPURE: 249598707
dc.identifier.otherPURE UUID: fc76a405-6323-4739-a2ee-917a77452f24
dc.identifier.otherScopus: 85018938023
dc.identifier.otherORCID: /0000-0002-9350-3197/work/34033055
dc.identifier.otherWOS: 000401847500047
dc.descriptionWe acknowledge the support of resources provided by UK National Centre for Atmospheric Science (NCAS), the High Performance Computing Cluster supported by the Research and Specialist Computing Support service at the University of East Anglia, UK Natural Environment Research Council (NERC), grants "CPE" (NE/K014757/1), and "Paleopolar" (NE/I005722/1). Data can be obtained from MJ on request. ACM acknowledges support from an AXA Postdoctoral Fellowship and the ERC ACCI grant Project No 267760, and NERC grant NE/M018199/1.en
dc.description.abstractThe prevailing paradigm for the climatic effects of large asteroid or comet impacts is a reduction in sunlight and significant short-term cooling caused by atmospheric aerosol loading. Here we show, using global climate model experiments, that the large increases in stratospheric water vapor that can occur upon impact with the ocean cause radiative forcings of over +20 W m−2 in the case of 10 km sized bolides. The result of such a positive forcing is rapid climatic warming, increased upper ocean stratification, and potentially disruption of upper ocean ecosystems. Since two thirds of the world's surface is ocean, we suggest that some bolide impacts may actually warm climate overall. For impacts producing both stratospheric water vapor and aerosol loading, radiative forcing by water vapor can reduce or even cancel out aerosol-induced cooling, potentially causing 1–2 decades of increased temperatures in both the upper ocean and on the land surface. Such a response, which depends on the ratio of aerosol to water vapor radiative forcing, is distinct from many previous scenarios for the climatic effects of large bolide impacts, which mostly account for cooling from aerosol loading. Finally, we discuss how water vapor forcing from bolide impacts may have contributed to two well-known phenomena: extinction across the Cretaceous/Paleogene boundary and the deglaciation of the Neoproterozoic snowball Earth.
dc.relation.ispartofGeophysical Research Lettersen
dc.rights© 2017 American Geophysical Union. All Rights Reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at:
dc.subjectClimate dynamicsen
dc.subjectAsteroid impacten
dc.subjectMeteor impacten
dc.subjectRadiative forcingen
dc.subjectK-Pg boundaryen
dc.subjectGE Environmental Sciencesen
dc.subjectGB Physical geographyen
dc.subjectAtmospheric Scienceen
dc.subjectSDG 13 - Climate Actionen
dc.subjectSDG 15 - Life on Landen
dc.titleGlobal warming and ocean stratification : a potential result of large extraterrestrial impactsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Mathematics and Statisticsen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. St Andrews Sustainability Instituteen
dc.contributor.institutionUniversity of St Andrews. Centre for Research into Ecological & Environmental Modellingen
dc.description.statusPeer revieweden

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