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| Titel |
Tidal controls on trace gas dynamics in a seagrass meadow of the Ria Formosa lagoon (southern Portugal) |
| VerfasserIn |
E. Bahlmann, I. Weinberg, J. V. Lavrič, T. Eckhardt, W. Michaelis, R. Santos, R. Seifert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 6 ; Nr. 12, no. 6 (2015-03-17), S.1683-1696 |
| Datensatznummer |
250117862
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| Publikation (Nr.) |
 copernicus.org/bg-12-1683-2015.pdf |
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| Zusammenfassung |
Coastal zones are important source regions for a variety of trace gases,
including halocarbons and sulfur-bearing species. While salt marshes,
macroalgae and phytoplankton communities have been intensively studied,
little is known about trace gas fluxes in seagrass meadows. Here we report
results of a newly developed dynamic flux chamber system that can be
deployed in intertidal areas over full tidal cycles allowing for highly time-resolved measurements. The fluxes of CO2, methane (CH4) and a
range of volatile organic compounds (VOCs) showed a complex dynamic mediated
by tide and light. In contrast to most previous studies, our data indicate
significantly enhanced fluxes during tidal immersion relative to periods of
air exposure. Short emission peaks occurred with onset of the feeder current
at the sampling site.
We suggest an overall strong effect of advective transport processes to
explain the elevated fluxes during tidal immersion. Many emission estimates
from tidally influenced coastal areas still rely on measurements carried out
during low tide only. Hence, our results may have significant implications
for budgeting trace gases in coastal areas. This dynamic flux chamber system
provides intensive time series data of community respiration (at night) and
net community production (during the day) of shallow coastal systems. |
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