HALIPP

Heterogeneous and Liquid Phase Processes

Completed


Type of Structure: coordinated project
Regional Scope: continental in the area: Europe
Parent Organisations: EUROTRAC.EUREKA, EU
Child Organisations:
Duration : 1988 to 1995 COMPLETED
Contact Address: no office contact defined


General information and objectives

Scientific aims:
• To understand the processes which generate and control oxidant and product concentrations in atmospheric droplets.
• To study the transfer of free radicals across gas/liquid interfaces of atmospheric droplets.
• To study the contribution of aerosols to the chemistry of trace gases and radicals including the photochemical surface production of active species.

Highlights of the scientific results
The reaction scheme for the oxidation of sulphur dioxide, S02, and sulphite to sulphate comprises many interlocking reactions involving transient intermediate species which are difficult to study independently. The situation is complicated further by the catalytic effect of trace amounts of transition metals present in aerosol particles. However the HALIPP investigators have added appreciably to the understanding in this field, with many studies on aspects of these reactions.
Two newly developed techniques within HALIPP have given sticking coefficients of ammonia, NH3, and nitrous acid, HONO, which are important in understanding the uptake of these gases by water droplets in cloud and fog.


Last update: 4/27/22
Source of data: ProClim- Research InfoSystem (1993-2024)

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