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AerChemMIP

Scientific Steering Group: Bill Collins, Michael Schulz, Jean-François Lamarque, Vaishali Naik, Olivier Boucher, Michaela I. Hegglin, Amanda Maycock, Gunnar Myhre, Michael Prather, Drew Shindell, and Steven J. Smith

The Aerosol Chemistry Model Intercomparison Project (AerChemMIP) is endorsed by the Coupled-Model Intercomparison Project 6 (CMIP6) and is designed to quantify the climate and air quality impacts of aerosols and chemically-reactive gases. These are specifically short-lived climate forcers (SLCFs: methane, tropospheric ozone and aerosols, and their precursors), nitrous oxide and ozone-depleting halocarbons. AerChemMIP analyses will inform the Sixth Assessment report of the IPCC (IPCC-AR6). The aim of AerChemMIP is to answer four scientific questions:

1. How have anthropogenic emissions contributed to global radiative forcing and affected regional climate over the historical period?

2. How might future policies (on climate, air quality and land use) affect the abundances of SLCFs and their climate impacts?

3. How can uncertainties in historical SLCF emissions be mapped onto pre-industrial to present-day changes?

4. How important are climate feedbacks to natural SLCF emissions, atmospheric composition, and ERF?

These questions will be addressed through targeted simulations with CMIP6 climate models that include an interactive representation of tropospheric aerosols and atmospheric chemistry. These simulations build on the CMIP6 Diagnostic, Evaluation and Characterization of Klima (DECK) experiments, the CMIP6 historical simulations, and future projections performed elsewhere in CMIP6, allowing the contributions from aerosols and/or chemistry to be quantified. Specific diagnostics are requested as part of the CMIP6 data request to highlight the chemical composition of the atmosphere, to evaluate the performance of the models, and to understand differences in behaviour between them.

AerChemMIP/RFMIP Analysis Topics: You are invited to comment on this google doc, suggest your contribution or your interest to analyze model simulations submitted to ESGF in support of AerChemMIP and RFMIP. Please enter your suggestions until July 5, 2019, so that preliminary plans can be made before the summer. The leads for the topics and the AerChemMIP/RFMIP chairs will discuss a revised document by ca mid July and this will be sent around again or entered in the above mentioned document.

AerChemMIP and RFMIP paper outline (status August 26, 2019):

Short note on planned papers

In preparation of the second order draft of the IPCC AR6 WG1, early drafts of papers are requested by late Oct/early November. Papers can be sent via email to ar6chapter6papers@ipcc-wg1.fr. All papers received will be treated as confidential.

Further AerChemMIP Information:

AerChemMIP GMD paper Collins et al. (2017)

Multimodel AerChemMIP Status (google sheet courtesy Fiona O'Connor)

Download AerchemMIP Data from ESGF, tutorial on how to download data from ESGF

ESGF CMIP6 AerChemMIP Data Holdings

AerChemMIP experiments via ES-DOC

Get Model information via ES-DOC (choose Model under Document Type to see select the model for which information is needed)

EXCEL tables of AerChemMIP data request

AerChemMIP email list

Frequently Asked Questions

Further CMIP6 Information:

CMIP6

CMIP6 Experiments (choose Experiment under Document Type to see the full list of CMIP6 experiments)

CMIP6 forcing datasets ( input4MIPs)

Endorsed CMIP6 MIPs

CMIP6 data request

Meetings

3rd Tri-MIP workshop

Registration and more info coming up in September

“Virtual” 16-20 November 2020

Times: 2 hours every day (incl. 1 hour discussion)

EU 3pm - 5pm

NY 9am - 11am

CA 6am - 8am

JP 10pm - 12midnight

CH 9pm - 11pm

2nd Tri-MIP (joint AerChemMIP/PDRMIP/ RFMIP) workshop in Princeton University, Princeton, NJ, 11-14 June 2019

1st Tri-MIP workshop in University of Reading, Reading, UK, 11-15 June 2018