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Journal article

A numerical evaluation of global oceanic emissions of alpha-pinene and isoprene

Luo G, Yu F...(+2 more)

Atmospheric Chemistry and Physics, vol. 10, issue 4 (2010) pp. 2007-2015

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Abstract

A numerical evaluation of global oceanic emissions

of -pinene and isoprene based on both “bottom-up”

and “top-down” methods is presented. We infer that the

global “bottom-up” oceanic emissions of -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 -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 “bottomup”

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 -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.

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