REPRODUCTION OF THE TEMPERATURE RESPONSE TO THE PINATUBO VOLCANIC IMPACT IN THE EARTH SYSTEM MODEL INMCM6

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Abstract

The results of experiments on tuning the aerosol block of the INMCM6 model for correct reproduction of the temperature response to volcanic emissions of sulfate aerosol are presented. Calculations were carried out using the INMCM6 Earth system model for the period from 1979 to 1995, during which two explosive volcanic eruptions occurred: El Chichon in 1982 and Pinatubo in 1991. Time series of the volume concentration and effective radius of sulfate stratospheric aerosol were specified according to the SADS v.3 database. Based on these data, optical properties of sulfate stratospheric aerosols (SSA) were calculated, which were then averaged for the wavelength intervals used in the radiation block of the INMCM6 climate model. In a series of model ensemble experiments, optical properties of SSA were varied in order to most realistically reproduce the temperature response of the climate system to volcanic action — cooling near the surface and heating of air in the stratosphere. If thermal heating of SSA is not considered, as a result of adjusting the short-wave optical parameters of the SSA, it was possible to reproduce with good accuracy (when compared with the ERA5 reanalysis data) the time course of the global optical thickness of the SSA, the amplitude of the warming of the lower stratosphere and the cooling of the lower troposphere. It was revealed that in the INMCM model the absorption of short-wave radiation by the SSA at wavelengths of 1–2 μm has the greatest influence on the magnitude of stratospheric warming.

About the authors

S. V. Kostrykin

Marchuk Institute of Numerical Mathematics RAS; Israel Institute of Global Climate and Ecology; Institute of Geography, RAS

Email: s_kostr@mail.ru
Moscow, Russia

E. M. Volodin

Marchuk Institute of Numerical Mathematics RAS

Moscow, Russia

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