Controls on methanol and acetone in marine and continental atmospheres

Details Controls on methanol and acetone in marine and continental atmospheres Controls on methanol and acetone in marine and continental atmospheres

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3302803m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 2, CiteID L02803

Physics

12

Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Atmospheric Processes: Boundary Layer Processes

Scientific paper

We present a regional analysis of CH3OH and (CH3)2CO in the New England continental and coastal marine atmospheres. Vegetative emissions over land comprise 60-80% of the daily peak-to-peak differences in the diurnal cycles of these oxygenated hydrocarbons. In the morning downward mixing of remnant boundary layer air over land provides an additional source equal to more than half of the vegetative emission strength. The ocean is both a sink and a source of CH3OH and (CH3)2CO, with dry depositional losses 2-fold greater than their source counterparts of 0.35 and 0.17 ppbv d-1 respectively. Anthropogenic emissions compensate for 59% and 52% of CH3OH and (CH3)2CO oceanic sink respectively, whereas over land this source is relatively small compared to substantial vegetative sources. Direct measurements of ocean- and land-air fluxes of CH3OH and (CH3)2CO and boundary layer height are needed to better constrain their regional budgets.

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