On this page we provide information about ammonia (NH3) emissions inventories that have been implemented into GEOS-Chem.
Agricultural NH3 emissions
Please see our MASAGE NH3 inventory wiki page.
NH3 emissions from arctic seabirds
This update was included in v11-02f (approved 17 May 2018).
Ammonia emissions from Arctic seabird-colonies are implemented in the region north of 50 °N. The total annual emissions of 35.6 Gg NH3 are spread uniformly in time between 1 May and 30 September to represent the seasonal migration of seabirds into the Arctic during the summer months. The sources for these emissions and further details on their spatial and temporal distribution are described in detail in Croft et al (2016) (Link to article). Studies involving these emissions should also cite Riddick et al. (2012) (Link to article) and Riddick, S. N. et al.Global ammonia emissions from seabirds. NERC Environmental Information Data Centre 10.5285/c9e802b3-43c8-4b36-a3a3-8861d9da8ea9 (2012)) (Link to article).
Seabird colony ammonia emissions for the remainder of the globe should be implemented after study of their seasonality for these additional regions. These sources are expected to be relevant particularly for the remote regions of Southern Hemisphere.