期刊
GEOPHYSICAL RESEARCH LETTERS
卷 32, 期 9, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GL022592
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We report global distributions of marine isoprene flux, whose source is estimated by combining an empirical relationship for isoprene production rate with MODIS satellite chlorophyll observations from 2001. We use a steady-state water column model including losses to chemistry, bacteria, and air-sea exchange. Physical mixing is a negligible sink. Flux estimates range from 10(7) 10(9) molecules cm(-2) s(-1), with considerable spatial and temporal variability, resulting in a global annual total of 0.1 Tg C/yr. Air-sea exchange is the dominant isoprene sink in the surface oceans, with bacteria the second largest, but much less important, sink. The reported fluxes represent a small loss of OH in the remote marine boundary layer (MBL) compared to other oxidants. Application of our approach to other reactive compounds may improve a priori flux estimates for coupled atmosphere-ocean biogeochemistry inverse model studies.
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