Atmosphärenchemie alt Text [en]

Vlassis Karydis

Hahn-Meitner-Weg 1, B.3.43
55128 Mainz
Phone: +49(6131)305-4645

Impact of Nitrate on Aerosol Composition and Radiative Effects

Atmospheric aerosols from natural and anthropogenic sources adversely affect human health and play an important role in changing the Earth’s climate. Inorganic particulate nitrate constituents contribute significantly to the total aerosol mass, especially in urban areas and industrialized regions. However, there is large uncertainty regarding the global nitrate aerosol load, its regional distribution, and its radiative forcing.

The scope of the NACRE project is to improve the representation of nitrate aerosol formation and size distribution in EMAC climate chemistry model to accurately predict their global concentration fields and their effects on global air quality and climate. The NACRE project will provide an assessment of:  

1. The effect of naturally emitted dust particles on global nitrate aerosol concentrations and size distributions by
a. Taking into account the nitrate thermodynamic interactions with chemically active mineral dust components and
b. Improving the accuracy of the predicted nitrate aerosol size distribution.

2. The effect of mineral dust on cloud droplet formation by taking into account
a. The adsorption of water on the surface of insoluble dust particles
b. The coating of soluble materials (like nitrates) on the surface of mineral particles which augments their CCN activity
c. The effect of mineral dust on the inorganic aerosol concentrations through thermodynamic interactions with mineral cations.

The developed modeling framework will serve as an ideal tool for providing unprecedented understanding of the radiative forcing and climate effects of nitrate aerosols as well as of the increased role of nitrate on the future global climate and air quality.