Marine Aerosol

Particles over the remote oceans are largely of marine origin (Savoie and Prospero, 1989). Marine atmosphere particle concentrations are normally in the range of 100 to 300/cm3 (Fitzgerald, 1991). Typically the coarse particle mode (diameters cxcccd-ing 1 pm), comprising 95% of the total mass but only 5 to 10% of the particle number, results from the evaporation of sea spray produced by bursting bubbles or wind-induced wave breaking (Blanchard and Woodcock, 1957; Monahan et al.,

4 TROPOSPHERIC AEROSOLS 219

10'

x—NF

rapopau

se

/ /

NT /- Middle Y Troposphere

A 1 i

111 "l*1

R

- Below 1.5 kn

about -

-:AIH /

1

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V

3ry rem

Wet oval

emoval

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Dry

amoval

x, days

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