“ Feedbacks between the terrestrial biosphere and the atmosphere through biogenic aerosol pathways (?)”

The coupling between land ecosystems and the atmospheric hydrological cycle

Water EnergyTrace GasEmissions

Aerosol formation

and growth

Cloud Condensation Nuclei

- Precipitation- Wet deposition of C, S, N-Temperature-Radiation

Clouds

Primary Organic Aerosol Emissions

Human perturbations

of the terrestrial landscapes

Summary of Session• “ Where are we coming from?”

– Introductions: Elevator speech– Overview of terminology and general concepts

• “ Where do we want to go?”– Discussion with senior scientists

• Al Cooper (NCAR)• Rus Monson (CU)

– Group discussions• General hypothesis/scientific questions• Specific unknowns and uncertainties

• “ How to we get there?”– Summarize– What’s next?

• Review paper? • White paper for EOS/BAMS/IGBP Newsletter? • NCAR technical note? • Another workshop/meeting?• Nothing?• Educational collaborations

• Proposed Hypothesis

Feedbacks between the terrestrial biosphere and the atmosphere through biogenic aerosol pathways are important.

- Is there a coupled cycle?

* Where and when is this important?

• Motivations and Applications– Climate and earth system understanding– Air quality and visibility– Understanding biodiversity and ecological changes– Weather

• Knowledge Gaps

• Feedbacks

Existingaerosol/gas

dry depositiontemperatureradiation

Speciation?Quantification? Speciation?

Quantification?

+,-,generalizable?

• Goals– To understand better individual pieces of processes– To answer the question:

• Is there a significant feedback?• If so, when and where is it important?

• Tools– Modeling tools

• apply simple models to identify significant knowledge gaps and conditions under which the feedbacks will be most important

• increase complexity with more detailed mechanisms of the various processes

– Instrument needs – Field measurements

• identification of site to evaluate entire cycle? Pieces of cycle?

• Summarize– What’s next?

• Inclusion of other people

• White paper for EOS/IGAC/IGBP Newsletter

• Another workshop/meeting?– field studies? – integrated modeling studies?

• Educational collaborations– NCAR teaching portal