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- Title
A numerical evaluation of global oceanic emissions of α-pinene and isoprene.
- Authors
Luo, G.; Yu, F.
- Abstract
A numerical evaluation of global oceanic emissions of α-pinene and isoprene based on both "bottom-up" and "top-down" methods is presented. We infer that the global "bottom-up" oceanic emissions of α-pinene and isoprene are 0.013 TgC yr-1 and 0.32 TgC yr-1, respectively. By constraining global chemistry model simulations with the shipborne measurement of Organics over the Ocean Modifying Particles in both Hemispheres summer cruise, we derived the global "top-down" oceanic α-pinene source of 29.5 TgC yr-1 and isoprene source of 11.6 TgC yr-1. Both the "bottom-up" and "top-down" values are subject to large uncertainties. The incomplete understanding of the in-situ phytoplankton communities and their range of emission potentials significantly impact the estimated global "bottom-up" oceanic emissions, while the estimated total amounts of the global "top-down" oceanic sources can be influenced by emission parameterizations, model and input data spatial resolutions, boundary layer mixing processes, and the treatments of chemical reactions. The global oceanic α-pinene source and its impact on organic aerosol formation is significant based on "top-down" method, but is negligible based on "bottom-up" approach. Our research highlights the importance of carrying out further research (especially measurements) to resolve the large offset in the derived oceanic organic emission based on two different approaches.
- Subjects
ATMOSPHERIC aerosols; EMISSIONS (Air pollution); ISOPRENE; PINENE; PHYTOPLANKTON; SIMULATION methods &; models
- Publication
Atmospheric Chemistry & Physics, 2010, Vol 10, Issue 4, p2007
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-10-2007-2010