NDLI: Chemical Assessment of Oceanic and Terrestrial Sulfur in the Marine Boundary Layer over the Northern North Pacific during Summer

Content Provider	Springer Nature Link
Author	Aranami, K. Watanabe, S. Tsugai, S. Ohki, A. Miura, K. Kojima, H.
Copyright Year	2002
Abstract	Dimethylsulfide (DMS) in surface seawater and the air, methanesulfonic acid (MSA) and non-sea-salt sulfate (nss-SO$_{4}$ $^{2}$−) in aerosol, and radon-222 (Rn-222) were measured in the northern North Pacific, including the Bering Sea, during summer (13 July – 6 September 1997). The mean atmospheric DMS concentrations in the eastern region (21.0 ± 5.8 nmole/m$^{3}$ (mean ± S.D.), n=30) and Bering Sea (19.9 ± 9.8 nmole/m$^{3}$, n=10) were higher than that in the western region (11.1 ± 6.4 nmole/m$^{3}$, n=31) (p<0.05), although these regions did not significantly differ in the mean DMS concentration in surface seawater. Mean sea-to-air DMS flux in the eastern region (21.0 ± 10.4 μ mole/m$^{2}$/day, n=19) was larger than those in the western region (11.3 ± 16.9 μ mole /m$^{2}$/day, n=22) and Bering Sea (11.2 ± 7.8 μ mole/m$^{2}$/day, n=7) (p<0.05). This suggests that the longitudinal difference in atmospheric DMS was produced by that in DMS flux owing to wind speed, while the possible causes of the higher DMS concentrations in the Bering Sea include (1) later DMS oxidation rates, (2) lower heights of the marine boundary layer, and (3) more inactive convection. The mean MSA concentrations in the eastern region (1.18 ± 0.84 nmole/m$^{3}$, n=35) and Bering Sea (1.17 ± 0.87 nmole/m$^{3}$, n=13) were higher than that in the western region (0.49 ± 0.25 nmole/m$^{3}$, n=28) (p < 0.05). Thus the distribution of MSA was similar to that of DMS, while the nss-SO$_{4}$ $^{2}$− concentrations were higher near the continent. This suggests that nss-SO$_{4}$ $^{2}$− concentrations were regionally influenced by anthropogenic sulfur input, because the distribution of nss-SO$_{4}$ $^{2}$− was similar to that of Rn-222 used as a tracer of continental air masses.
Starting Page	49
Ending Page	66
Page Count	18
File Format	PDF
ISSN	01677764
Journal	Journal of Atmospheric Chemistry
Volume Number	41
Issue Number	1
e-ISSN	15730662
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Meteorology/Climatology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Atmospheric Science

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