A modeling study of oceanic nitrous oxide during the Younger Dryas cold period

Details A modeling study of oceanic nitrous oxide during the Younger Dryas cold period A modeling study of oceanic nitrous oxide during the Younger Dryas cold period

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30b..64g&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 2, pp. 64-1, CiteID 1092, DOI 10.1029/2002GL016418

Mathematics

Logic

4

Global Change: Climate Dynamics (3309), Oceanography: Biological And Chemical: Organic Marine Chemistry, Meteorology And Atmospheric Dynamics: Paleoclimatology, Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation

Scientific paper

The marine production, cycling, and air-sea gas exchange of nitrous oxide (N2O) are simulated in a coupled climate-biogeochemical model of reduced complexity. The model gives a good representation of the large-scale features of the observed oceanic N2O distribution and emissions to the atmosphere. The transient behavior of the model is tested for the Younger Dryas (Y-D) cold period (12,700-11,550 BP), which is simulated by releasing a freshwater pulse into the North Atlantic, causing a temporary collapse of the model's Atlantic thermohaline circulation (THC). A temporary drop in atmospheric N2O of about 10 ppb results, while ice-core measurements show a total drop of 25 to 30 ppb. This suggests that terrestrial changes have also contributed to the observed variations. The main cause of the modeled reduction in atmospheric N2O is increased oceanic storage in the short-term and a reduction of new production in the long-term due to increased stratification.

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