top of page

Joint ANR-RGC Scheme

Impact of Air-Sea Exchanges on Air Quality in Coastal Megacities(Hong Kong RGC)


---- To address production of organic gases and particles at sea surface impacted by urban pollution
---- To explore the atmospheric chemistry of halogen-NOx-VOC and impacts on the radical budget and formation of secondary compounds
---- To pursue the interplay between the sea-air exchange of chemicals, the sea-land breeze circulation and air quality (ozone and particulate matter) in coastal megacities.


This projects can be divided into 4 work packages (WP)

WP1: Sea-surface chemistry under polluted conditions ---- here the photochemical production of unsaturated carbonyls, possibly halogenated products, will be investigated in a multiphase simulation chamber. This family of reactive VOC has been recently identified under pristine conditions by the group at Lyon as arising from abiotic processes at the air/water interface. They act as sources of organic aerosols. WP1 will measure for the first time the boosting effect of air pollution on such emissions.

WP2: Gas-phase chemistry of functionalized/halogenated and reactive VOCs formed at the air-sea interface and of BVOCs ---- here the gas phase chemistry of the VOCs identified in WP1 will be investigated in a large outdoor chamber under various simulated environmental conditions and natural sunlight. This chemistry may lead to some HOx recycling, production of further reactive molecules, SOA precursors (such as glyoxal) and SOA. WP2 will aim at characterizing all of these secondary species.

WP3: Field study of atmospheric chemistry in coastal megacity and adjacent marine areas using Hong Kong as the case study ---- here the outcomes of the above WPs will be tested, identified and quantified in the field.

WP4: Model assessment of the impacts of sea-surface interactions on regional air quality under continental outflow and sea-land breeze circulations ---- here these data will be implemented into a model for impact assessments.

Impact of Air-Sea Exchanges on Air Quality in Coastal Megacities(Hong Kong RGC)


This is placeholder text. To change this content, double-click on the element and click Change Content. Want to view and manage all your collections? Click on the Content Manager button in the Add panel on the left. Here, you can make changes to your content, add new fields, create dynamic pages and more. You can create as many collections as you need.

Your collection is already set up for you with fields and content. Add your own, or import content from a CSV file. Add fields for any type of content you want to display, such as rich text, images, videos and more. You can also collect and store information from your site visitors using input elements like custom forms and fields.

Be sure to click Sync after making changes in a collection, so visitors can see your newest content on your live site. Preview your site to check that all your elements are displaying content from the right collection fields.
bottom of page