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Key Issues Sources of aerosol in the VOCALS-Rex region - can we quantify the key sources?

Key Issues Sources of aerosol in the VOCALS-Rex region - can we quantify the key sources? role of nucleation and what is its role in BL repopulation Entrainment

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Key Issues Sources of aerosol in the VOCALS-Rex region - can we quantify the key sources?

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  1. Key Issues • Sources of aerosol in the VOCALS-Rex region - can we quantify the key sources? • role of nucleation and what is its role in BL repopulation • Entrainment • To what extent are cloud processes, for example the propensity for drizzle; POC formation or sustenance, controlled by the air masses above and below the BL encountered during VOCALS-REx? • Aerosol-Cloud-Precipitation Interactions – can we separate micro and large scale effects? • VOCALS offers an ideal framework to challenge coupled chemistry-cloud models

  2. Key Issues • Sources of aerosol in the VOCALS-Rex region - can we quantify the key sources? • - the gradient that we all report in the BL is also evident in the FT – how important are the BL and FT aerosol in influencing cloud properties • - Santiago and smelters are important contributors but perhaps not as dominant as originally perceived, what is the role of regional pollution versus individual plumes? • - what is clean and where is clean? • - what is the input of aerosol from the north and its impact regionally? • - Biomass burning influences • - what is the sea salt contribution? • - what is the DMS contribution to sulphate versus anthropogenic sources

  3. Key Issues 2 • role of nucleation and what is its role in BL repopulation • POCs • clean layers • polluted outflow • linkages to DMS • Entrainment • Role of entrainment in resupply of aerosol • enhancement in turbulent cloud elements versus large scale entrainment in models? • effect on dehydration of cloud layer • To what extent are cloud processes, for example the propensity for drizzle; POC formation or sustenance, controlled by the air masses above and below the BL encountered during VOCALS-REx?

  4. Aerosol-Cloud-Precipitation Interactions • -What is the role of precipitation in controlling the aerosol population in the region? and conversely what is the role of aerosol in influencing precipitation? • - Can we separate microphysical effects on clouds from large scale effects? • VOCALS offers an ideal framework to challenge coupled chemistry-cloud models • - Can/should VOCALS play a coordinating role in identifying the optimum physical schemes for use by these models before testing of the chemical schemes? How?

  5. Key Issues • Sources of aerosol in the VOCALS-Rex region - can we quantify the key sources? • role of nucleation and what is its role in BL repopulation • Entrainment • To what extent are cloud processes, for example the propensity for drizzle; POC formation or sustenance, controlled by the air masses above and below the BL encountered during VOCALS-REx? • Aerosol-Cloud-Precipitation Interactions – can we separate micro and large scale effects? • VOCALS offers an ideal framework to challenge coupled chemistry-cloud models

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