 |
| Titel |
Influence of air-sea fluxes on atmospheric aerosols during summer monsoon in the Indian Ocean. |
| VerfasserIn |
Alex Zavarsky, Dennis Booge, Alina Fiehn, Kirstin Krüger, Elliot Atlas, Christa Marandino |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141109
|
| Publikation (Nr.) |
 EGU/EGU2017-4579.pdf |
|
|
|
|
|
| Zusammenfassung |
| The local influence of air-sea trace gas fluxes on atmospheric aerosols in the remote marine
boundary layer (MBL) is still heavily disputed. During summer monsoon, the western
tropical Indian Ocean is predicted to be a hotspot for dimethylsulfide (DMS) emissions, the
major marine sulfur source to the atmosphere and an important aerosol precursor. Other
aerosol relevant fluxes, such as isoprene and sea salt fluxes, should also be enhanced, due to
the steady strong winds during the monsoon. In addition, maritime air masses dominate the
area during the summer monsoon, excluding the influence of continentally derived pollutants.
During the 234-2/235 cruise in the western tropical Indian Ocean from July-August, 2014,
directly measured eddy covariance DMS fluxes confirm that the area is a large source of
sulfur to the atmosphere (8.4 μmolm−2d−1). The directly measured fluxes, as well as
computed isoprene and sea salt fluxes, were combined with FLEXPART back- and forward
trajectories to track the emissions in space and time. The fluxes correlate with satellite
aerosol products from MODIS-TERRA and Suomi-NPP, showing significant values
from 0.42 to 0.62. The maximum correlations were found between 3 and 10 hours
after emission, reflecting reasonable timing for atmospheric transformations and
indicating a local influence of marine emissions on atmospheric aerosol properties. |
|
|
|
|
|
|