High latitude biospheric activity during the last glacial cycle revealed by ammonium variations in Greenland ice cores

Details High latitude biospheric activity during the last glacial cycle revealed by ammonium variations in Greenland ice cores High latitude biospheric activity during the last glacial cycle revealed by ammonium variations in Greenland ice cores

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4239h&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 22, p. 4239-4242

Physics

2

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Global Change: Atmosphere, Global Change: Biogeochemical Processes, Meteorology And Atmospheric Dynamics: Paleoclimatology

Scientific paper

The short (325 m) Renland ice core from East Greenland was the first ice core to provide a continuous record of ammonium (NH4+) through the whole glacial period. The deep ice cores GRIP and GISP2 from Summit have confirmed that it is representative of the NH4+ deposition on Greenland. We argue that high levels of NH4+ in the ice during periods of warming (at the end of the last glaciation, during Dansgaard/Oeschger events, in MIS 5a and 5c, and during the Eem interglacial) provide evidence for rapid response by high latitude ecosystems and soils since the atmospheric turn-over time of ammonia (including its existence as NH4+) is short. Sources which emit ammonia usually also emit methane. High Greenland NH4+ levels coincide with high global methane concentrations. Northern high latitude biogenic sources are here suggested to contribute significantly to global methane concentrations during periods of warming during the last glacial period.

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