HR: 0800h
AN: A51D-0732    [Abstracts]
TI: DMS Air-Sea Transfer Velocity Functionality From DOGEE
AU: Blomquist, B W
EM: blomquis@hawaii.edu
AF: University of Hawaii, Dept of Oceanography, Honolulu, HI 96822, United States
AU: * Huebert, B J
EM: huebert@hawaii.edu
AF: University of Hawaii, Dept of Oceanography, Honolulu, HI 96822, United States
AU: Archer, S J
EM: s.archer@pml.ac.uk
AF: Plymouth Marine Laboratory, Volatiles Research Group Prospect Place, Plymouth, NY PL1 3DH, United Kingdom
AB: We measured the sea/air flux of DMS by eddy correlation (EC) on an sub-hourly time scale in the North Atlantic from the UK ship RRS Discovery in June and July of 2007, as a part of the Deep Ocean Gas Exchange Experiment, DOGEE. We used an atmospheric pressure ionization mass spectrometer (APIMS) with an internal isotopically-labeled standard (D3-DMS) to rapidly measure atmospheric DMS. We also measured seawater DMS concentrations with a purge and trap system on a roughly seven-minute time scale, so that we could compute the DMS transfer velocity (Vt, the EC-derived flux divided by the interfacial concentration difference) on an hourly basis. Wind speeds ranged from nearly calm to over 15 m/s. We compare our exchange velocities with simultaneous measurements of wave slope, bubbles, surfactants (intentional patches), and exchange velocities from dual-tracer releases. The time-scale (hourly) of the sea/air gas fluxes and exchange velocities enables us to address the functionalities of the other controlling factors.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0322 Constituent sources and sinks
DE: 0330 Geochemical cycles (1030)
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 1635 Oceans (1616, 3305, 4215, 4513)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting