A114-0011
Simulation of the June 2019 Raikoke eruption with the ECMWF’s IFS-CB05-BASCOE-GLOMAP (ICBG) system

Friday, 11 December 2020
Poster
Samuel Rémy1, Graham W Mann2, Vincent Huijnen3, Simon Henri Chabrillat4, Johannes Flemming5, Zak Kipling5, Antje Inness6 and Richard J Engelen6, (1)HYGEOS, Lille, France, (2)University of Leeds, Leeds, LS2, United Kingdom, (3)Royal Netherlands Meteorological Institute, De Bilt, Netherlands, (4)Royal Belgian Institute for Space Aeronomy, Brussels, Belgium, (5)European Centre for Medium-Range Weather Forecasts, Reading, United Kingdom, (6)ECMWF, Reading, United Kingdom
Abstract:
The Raikoke volcano, located in the Southern Kurils Islands, erupted on 21-22 June 2019, releasing an estimated 1.5Tg SO2 mainly in the lower stratosphere. This eruption was the largest stratospheric volcanic event since the eruption of the Nabro in 2011. The resulting Sulphur dioxide and sulphate aerosol plumes, which remained mostly confined to the North Hemisphere and the lower stratosphere, were extensively monitored and documented by a wide range of ground-based or remote instruments, including the new TROPOMI sensor onboard the Sentinel 5p satellite. This makes it a good case study to evaluate the recently developed ECMWF’s IFS-CB05-BASCOE-GLOMAP (ICBG) system.

ICBG is a global tropospheric-stratospheric combined aerosol-chemistry model which was built in the ECMWF IFS as part of the Copernicus Atmosphere Monitoring Services (CAMS). ICBG is the result of the coupling of:

  • IFS-GLOMAP: a tropospheric-stratospheric aerosol modal scheme that is embedded in the ECMWF Integrated Forecasting System (IFS)
  • IFS-CB05-BASCOE: a tropospheric (CB05) –stratospheric (BASCOE) chemistry scheme embedded in the IFS

ICBG was designed to simulate the chemistry and aerosol aspects of a large volcanic eruption. The stratospheric chemistry scheme IFS-BASCOE has been extended to include a stratospheric Sulphur cycle. The sulphuric acid simulated by IFS-BASCOE is used in the aerosol scheme IFS-GLOMAP to estimate nucleation and condensation. The surface area density (SAD) of stratospheric sulphate particles are used as an input in IFS-BASCOE for heterogeneous reactions.

The Raikoke eruption and its aftermath have been simulated by the ICBG, using emissions derived from GOME-2 data. The resulting simulated Sulphur dioxide plume matched very well the stratospheric SO2 retrieval from TROPOMI. The simulated aerosol burden and profiles showed a reasonable agreement to ground and remote observations.

<< Previous Abstract | Next Abstract