 |
| Titel |
Dimethylsulfide gas transfer coefficients from algal blooms in the Southern Ocean |
| VerfasserIn |
T. G. Bell, W. De Bruyn, C. A. Marandino, S. D. Miller, C. S. Law, M. J. Smith, E. S. Saltzman |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-19), S.1783-1794 |
| Datensatznummer |
250119444
|
| Publikation (Nr.) |
 copernicus.org/acp-15-1783-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Air–sea dimethylsulfide (DMS) fluxes and bulk air–sea gradients were
measured over the Southern Ocean in February–March 2012 during the Surface
Ocean Aerosol Production (SOAP) study. The cruise encountered three distinct
phytoplankton bloom regions, consisting of two blooms with moderate DMS
levels, and a high biomass, dinoflagellate-dominated bloom with high seawater
DMS levels (> 15 nM). Gas transfer coefficients were
considerably scattered at wind speeds above 5 m s−1. Bin averaging the
data resulted in a linear relationship between wind speed and mean gas
transfer velocity consistent with that previously observed. However, the
wind-speed-binned gas transfer data distribution at all wind speeds is
positively skewed. The flux and seawater DMS distributions were also
positively skewed, which suggests that eddy covariance-derived gas transfer
velocities are consistently influenced by additional, log-normal noise. A
flux footprint analysis was conducted during a transect into the prevailing
wind and through elevated DMS levels in the dinoflagellate bloom. Accounting
for the temporal/spatial separation between flux and seawater concentration
significantly reduces the scatter in computed transfer velocity. The SOAP gas
transfer velocity data show no obvious modification of the gas transfer–wind
speed relationship by biological activity or waves. This study highlights the
challenges associated with eddy covariance gas transfer measurements in
biologically active and heterogeneous bloom environments. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|