Climate response and feedback to the large volcanic eruption of Los Chocoyos in the MPI ESM.

Metzner, Doreen, Zanchettin, D., Toohey, Matthew, Niemeier, U., Kutterolf, Steffen, Freundt, Armin, Timmreck, C. and Krüger, Kirstin (2010) Climate response and feedback to the large volcanic eruption of Los Chocoyos in the MPI ESM. [Talk] In: SFB 574 Subduction Workshop. , 04.-07.11.2010, Pucon, Chile .

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Abstract

One of the most important natural causes of climate change are large volcanic eruptions as they have a significant impact on Earth's global climate system, especially on the tropospheric and stratospheric circulation. The direct
injection of gases, aerosols and volcanic ash into the stratosphere has a strong and long lasting radiative influence, which leads to a global reduction in surface temperatures, and a pronounced warming of the stratosphere, for several years or even decades. To evaluate the climate response and feedback to an extremely large volcanic eruption we use the complex MPI-Earth System Model (ESM) by forcing it with a simulated Aerosol Optical Depth (AOD) distribution resulting from a stratospheric injection of 700 Mt SO2, corresponding to the Los Chocoyos eruption (VEI>7) in Guatemala (84 ka BP). To take into account the unknown season of the eruption, we perform experiments for January and July eruptions, including five ensemble simulations for each. We consider global atmospheric effects as well as changes in the ocean circulation, sea ice and the carbon cycle, which are generated by complex relationships between the radiative forcing and the earth climate system on different time scales. In this study we show that the global surface temperature and especially the
tropical precipitation drop rapidly before they recover within 8 years. The ocean response indicates a reduction in ocean heat content, a strengthening of the Meridional Overturning Circulation (MOC) and a sensitivity of the sea
ice content on longer time scales. Finally modifications in the CO2 storage of the earth climate system comprising the ocean, land and atmospheric CO2 concentrations are investigated

Document Type: Conference or Workshop Item (Talk)
Keywords: Geodynamics; subduction; volcanology; Los Chocoyes
Research affiliation: OceanRep > SFB 574 > C4
OceanRep > SFB 574 > C5
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
OceanRep > SFB 574
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Date Deposited: 10 Dec 2010 12:55
Last Modified: 23 Feb 2012 06:02
URI: http://oceanrep.geomar.de/id/eprint/10425

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