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| Titel |
Hydrothermal 3He in the near field of natural CO2 seeps in the Okinawa Trough |
| VerfasserIn |
Antje Buß, Maren Walter, Christian Mertens, Jürgen Sültenfuß, Monika Rhein |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046327
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| Zusammenfassung |
| The Okinawa Trough back-arc basin in the west Pacific Ocean is one of the two known
hydrothermally active areas where venting of liquid CO2 has been observed.
During the RV Sonne cruise So196 in March 2008 two hydrothermal vent fields in the
southern Okinawa Trough were investigated: Hatoma Knoll and Yonaguni Knoll IV. Data
were collected to characterize the dispersal of the plume in the water column. The data set
consists of CTD casts with additional sensors for oxygen, turbidity and pH as well as velocity
measurements with a lowered acoustic Doppler current profiler (LADCP) and water samples
to analyze helium isotopes.
The dispersal of the plumes in the two regions is analyzed using primordial 3He as a
conservative tracer. The non-buoyant plume over the caldera of Hatoma Knoll was sampled
as well as a buoyant plume which was still in the process of rising. Using the rise height of
the plume and the background stratification, the heat flux of the two vent fields is
estimated.
Furthermore the relation between the measured decrease of pH and 3He in the plume is
analyzed. Here, first results show a good linear correlation at the Hatoma Knoll vent field. |
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