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Global warming and ocean stratification: a potential result of large extraterrestrial impacts

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Global warming and ocean stratification : a potential result of large extraterrestrial impacts. / Joshi, Manoj; von Glasow, Roland; Smith, Robin S. ; Paxton, Charles G. M.; Maycock, Amanda C. ; Lunt, Daniel J.; Loptson, Claire; Markwick, Paul.

In: Geophysical Research Letters, Vol. 44, No. 8, 28.04.2017, p. 3841-3848.

Research output: Contribution to journalArticle

Harvard

Joshi, M, von Glasow, R, Smith, RS, Paxton, CGM, Maycock, AC, Lunt, DJ, 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. https://doi.org/10.1002/2017GL073330

APA

Joshi, M., von Glasow, R., Smith, R. S., Paxton, C. G. M., Maycock, A. C., Lunt, D. J., ... Markwick, P. (2017). Global warming and ocean stratification: a potential result of large extraterrestrial impacts. Geophysical Research Letters, 44(8), 3841-3848. https://doi.org/10.1002/2017GL073330

Vancouver

Joshi M, von Glasow R, Smith RS, Paxton CGM, Maycock AC, Lunt DJ et al. Global warming and ocean stratification: a potential result of large extraterrestrial impacts. Geophysical Research Letters. 2017 Apr 28;44(8):3841-3848. https://doi.org/10.1002/2017GL073330

Author

Joshi, Manoj ; von Glasow, Roland ; Smith, Robin S. ; Paxton, Charles G. M. ; Maycock, Amanda C. ; Lunt, Daniel J. ; Loptson, Claire ; Markwick, Paul. / Global warming and ocean stratification : a potential result of large extraterrestrial impacts. In: Geophysical Research Letters. 2017 ; Vol. 44, No. 8. pp. 3841-3848.

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@article{fc76a40563234739a2ee917a77452f24,
title = "Global warming and ocean stratification: a potential result of large extraterrestrial impacts",
abstract = "The 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.",
keywords = "Climate dynamics, Asteroid impact, Meteor impact, Radiative forcing, K-Pg boundary, Neoproterozoic",
author = "Manoj Joshi and {von Glasow}, Roland and Smith, {Robin S.} and Paxton, {Charles G. M.} and Maycock, {Amanda C.} and Lunt, {Daniel J.} and Claire Loptson and Paul Markwick",
note = "We 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.",
year = "2017",
month = "4",
day = "28",
doi = "10.1002/2017GL073330",
language = "English",
volume = "44",
pages = "3841--3848",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "John Wiley & Sons, Ltd.",
number = "8",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Global warming and ocean stratification

T2 - a potential result of large extraterrestrial impacts

AU - Joshi, Manoj

AU - von Glasow, Roland

AU - Smith, Robin S.

AU - Paxton, Charles G. M.

AU - Maycock, Amanda C.

AU - Lunt, Daniel J.

AU - Loptson, Claire

AU - Markwick, Paul

N1 - We 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.

PY - 2017/4/28

Y1 - 2017/4/28

N2 - The 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.

AB - The 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.

KW - Climate dynamics

KW - Asteroid impact

KW - Meteor impact

KW - Radiative forcing

KW - K-Pg boundary

KW - Neoproterozoic

UR - http://onlinelibrary.wiley.com/doi/10.1002/2017GL073330/abstract?campaign=wolsavedsearch#footer-support-info

U2 - 10.1002/2017GL073330

DO - 10.1002/2017GL073330

M3 - Article

VL - 44

SP - 3841

EP - 3848

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 8

ER -

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