Possible controls of particle flux in the Weddell Gyre


Contact
walter.geibert [ at ] awi.de

Abstract

Seen from space, the Weddell Gyre (WG) is a high chlorophyll region. The controls of biological productivity in the WG differ from most other oceanic regions. The major nutrients nitrate, phosphate and silicate occur in abundance and are usually not limiting. Instead, trace elements and light availability control plankton blooms, and ice cover modulates local concentrations. The ultimate sources of trace elements that can support the high productivity have still not been identified- the deep WG has amongst the lowest iron concentrations of any part of the ocean. Also, the fate of the surface blooms is not clear. Following export from the surface, shallow remineralization seems to dissolve most organic material, and the abyssal Weddell Sea sediments contain almost no trace of the surface productivity. Sedimentation rates are on the order of millimeters per kiloyear. This contribution will follow some possible reasons for the anomalous characteristics of the biogeochemistry of the WG.



Item Type
Conference (Talk)
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
SOOS Wedddell Sea-Dronning Maud Land Regional Working Group workshop, 20 Oct 2020 - 23 Oct 2020, Delmenhorst/Virtual.
Eprint ID
53170
Cite as
Geibert, W. (2020): Possible controls of particle flux in the Weddell Gyre , SOOS Wedddell Sea-Dronning Maud Land Regional Working Group workshop, Delmenhorst/Virtual, 20 October 2020 - 23 October 2020 .


Share

Research Platforms

Campaigns


Actions
Edit Item Edit Item