Estimates of volcanic-induced cooling in the Northern Hemisphere over the past 1,500 years

Markus Stoffel; Myriam Khodri; Christophe Corona; Sébastien Guillet; Virginie Poulain; Slimane Bekki; Joel Guiot; Brian H. Luckman; Clive Oppenheimer; Nicolas Lebas; Martin Beniston; Valérie Masson-Delmotte

doi:10.1038/ngeo2526

Estimates of volcanic-induced cooling in the Northern Hemisphere over the past 1,500 years

Markus Stoffel ^{1, 2} Myriam Khodri ³ Christophe Corona ⁴ Sébastien Guillet ¹ Virginie Poulain ³ Slimane Bekki ⁵ Joel Guiot ^{6, 7} Brian H. Luckman ⁸ Clive Oppenheimer ⁹ Nicolas Lebas ³ Martin Beniston ² Valérie Masson-Delmotte ¹⁰

1 Dendrolab.ch [Bern]

2 ISE - Institute for Environmental Sciences [Geneva]

3 PARVATI - Processus de la variabilité climatique tropicale et impacts

LOCEAN - Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques

4 GEOLAB - Laboratoire de Géographie Physique et Environnementale

5 STRATO - LATMOS

LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales

6 ECCOREV - Ecosystèmes continentaux et risques environnementaux

7 CEREGE - Centre européen de recherche et d'enseignement de géosciences de l'environnement

8 Department of Geography [London, Ontario]

9 Department of Geography [Cambridge, UK]

10 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]

Abstract : Explosive volcanism can alter global climate, and hence trigger economic, political and demographic change1, 2. The climatic impact of the largest volcanic events has been assessed in numerous modelling studies and tree-ring-based hemispheric temperature reconstructions3, 4, 5, 6. However, volcanic surface cooling derived from climate model simulations is systematically much stronger than the cooling seen in tree-ring-based proxies, suggesting that the proxies underestimate cooling7, 8; and/or the modelled forcing is unrealistically high9. Here, we present summer temperature reconstructions for the Northern Hemisphere from tree-ring width and maximum latewood density over the past 1,500 years. We also simulate the climate effects of two large eruptions, in AD 1257 and 1815, using a climate model that accounts explicitly for self-limiting aerosol microphysical processes3, 10. Our tree-ring reconstructions show greater cooling than reconstructions with lower spatial coverage and based on tree-ring width alone, whereas our simulations show less cooling than previous simulations relying on poorly constrained eruption seasons and excluding nonlinear aerosol microphysics. Our tree-ring reconstructions and climate simulations are in agreement, with a mean Northern Hemisphere extra-tropical summer cooling over land of 0.8 to 1.3 °C for these eruptions. This reconciliation of proxy and model evidence paves the way to improved assessment of the role of both past and future volcanism in climate forcing.

Type de document :

Article dans une revue

Nature Geoscience, Nature Publishing Group, 2015, 8 (10), pp.784-788. 〈10.1038/ngeo2526〉

Domaine :

Physique [physics] / Physique [physics] / Physique Atmosphérique et Océanique [physics.ao-ph]

Planète et Univers [physics] / Océan, Atmosphère

Liste complète des métadonnées

https://hal-insu.archives-ouvertes.fr/insu-01214206
Contributeur : Catherine Cardon <>
Soumis le : samedi 10 octobre 2015 - 17:04:48
Dernière modification le : vendredi 15 février 2019 - 14:50:57

Estimates of volcanic-induced cooling in the Northern Hemisphere over the past 1,500 years

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