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                                                                     Framework and Guidelines for Participants

The ultimate objective of the workshop is to integrate along the following structure so that we put the subject of GDB in the context of the

questions in Topic 3. In the first part of the workshop we will have short lectures underlying the recent scientific research. Following we will

break to discussion groups. This will be transformed into a document to be published in a high profile target journal (e.g. JGR, BAMS).

Workshop structure:

      1. Measurements of dimming and brightening components

a.             How much, where and when?

b.            How does it partition between aerosols, clouds and gas absorption?

2. Trends between aerosols, clouds, precipitation and radiation

a.             Relations between trends in aerosols, cloud cover and their properties.

b.            Feedbacks through impacts on precipitation.

c.             The role of land processes

3. Implications for understanding present and future climates.

a.             Impacts of differential dimming on modulating circulation patterns and the hydrological cycle (e.g., monsoons).

b.            Implications for understanding present and future climates, and influences on hydrology, agriculture, and land use

c.             Relations between surface and TOA forcing and possible impacts on present and future global temperatures.

The workshop is organized to address these topics in a structured way. The participants are requested to prepare their presentations to be in

this context. In the workgroups we can identify the known and missing links in this flow, and practical recommendations. We will have three

discussion groups on these three subjects, and will combine them together.

The outcome should put GDB in an updated context.