Session: Last Millennium & Past2K
Author: Myriam Khodri / email@example.com / LOCEAN/IPSL, France
Co-author: Davide Zanchettin, University of Venice, Italy;
Claudia Timmreck, Max-Planck-Institute for Meteorology, Hamburg, Germany;
Our understanding of the climatic response to volcanic forcing is hampered by the large uncertainties affecting the instrumental records, due to the limited number of observed events, and the available climate reconstructions, and by the non-robust dynamical responses simulated by different climate models. The lack of agreement between model results is crucially determined by differences in the model’s characteristics such as resolution, complexity and implementation strategy of the forcing, and uncertainty in the eruption details including magnitude, latitude and season, input data and background climate. The multiple and varied nature of these factors prevents their contribution to uncertainty from being distinguished within existing transient simulations or non-coordinated multi-model experiments.
The Model Intercomparison Project on the climatic response to Volcanic forcing (VolMIP) presented here focuses on the response of the coupled ocean-atmosphere system to strong volcanic forcing. VolMIP is a CMIP6 endorsed project, which defines a common protocol to subject Earth system models and coupled general circulation models to the same volcanic forcing and under a similar range of background climate conditions. By doing so, VolMIP aims at assessing to what extent simulated responses are robust across models and at identifying the causes that limit robust behavior, especially as far as different treatment of physical processes is concerned. VolMIP provides context to the PMIP4-past1000 simulations, where volcanic forcing is among the dominant sources of climate variability. In particular, VolMIP and PMIP4 have defined a hierarchy of experiments focused on the early 19th century that will allow us to investigate the interactions between different natural forcing factors and the role of background climate conditions during one of coldest periods of the last millennium.
In this contribution, we will present an overview of VolMIP and discuss how ongoing and planned coordinated activities contribute to strengthen the synergies between VolMIP and PMIP4.