AeroCom/Recommendations

AeroCom wiki discussion entry

See also AeroCom/Working group structure and individual discussion pages

Recommendations for AeroCom phase II

Version 1.0 - summarising discussions during the 5th AeroCom workshop in Virginia Beach, 17-19 October 2006

Michael Schulz / LSCE

Goals

• Evaluate and compare global aerosol models
• Compare aersol observations and models
• Improve the aerosol models
• Derive useful products

Organisational

To encourage joint analysis working groups are suggested which shall establish a working document for AeroCom by December 2006.

The coordination and elaboration is planned to be done via an interactive, transparent AeroCom wiki page.

The workshop recommends a coordinating committee to be formed from the lead persons of the working groups. As overall coordinator are proposed Michael Schulz, Mian Chin and Stefan Kinne

The AeroCom initiative shall be developed in order to contribute as the aerosol component to the « Atmospheric Chemistry and Climate » initiative of WCRP and IGAC.

Subgoals

Improve the analysis of the aerosol anthropogenic forcing in effect for the 4th IPCC AR, stored at PCMDI by asking model groups to redo two specific model runs (present and preindustrial)

Plan for comparable diagnostics of aerosol effects in coupled aerosol-climate Simulations

Evolution of aerosol radiative forcing in 20th century

Investigate how complex an aerosol model needs to be to study �aerosol climate feedbacks

Produce an aerosol climatology just from AeroCom as input to climate models?

Deviating from former IPCC scenarios an updated publicly available emission scenario for all aerosol species and precursors is needed for three time periods - preindustrial to present - satellite observation period (1979-2005) - preindustrial to future

A median, a minimum and maximum scenario is recommended to�best fulfill the need to explore uncertainty with respect to emissions.

Sector related emissions are needed to differentiate anthropogenic and economic sector related emissions.

A preliminary version is required to be available for the year 2007 to produce at an early stage an aerosol climatology of concentrations for realistic aerosol-climate runs

Joint Experiments

• AeroCom D

(as AeroCom A but revised model versions and diagnostics for purpose of further analysis of problems found earlier in AeroCom)

• HTAP experiments SR1 and SR6 and SR7

Hemispheric transport of air pollution analysis of source receptor relationships Diagnostics PM and AOD (and gases), Reduction by 20% of anthropogenic Emissions in Asia, Europe and N-America, CO passive tracer experiment.

• AeroCom F

Fixed monthly 3d removal rates (and emissions) prescribed, to eliminate diversity due to differing removal process parameterisations

• Reanalysis of 4th AR IPCC experiments

Radiative forcing calculation for coupled model versions used for AR4. Rerun of a characteristic pre-industrial and present year with full RF diagnostics Coherent diagnostics with AeroCom database

• AeroCom Indirect II

Follow up of Penner et al. 2006 experiment suite. Re-designed diagnostics.

• Reanalysis of aerosol (and climate) evolution in 20th century

Compute all or segments of 20th century until 2005 with analysed meteorology or transient climate model

• Future median/high/low aerosol emission scenarios with aerosol-climate interactions

In preparation of the 5th AR IPCC;