Carbon dynamics of the Weddell Gyre, Southern Ocean ...
The accumulation of carbon within the Weddell Gyre and its exchanges across the gyre boundaries are investigated with three recent full-depth oceanographic sections enclosing this climatically important region. The combination of carbon measurements with ocean circulation transport estimates from a...
Main Authors: | , , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
ETH Zurich
2015
|
Subjects: | |
Online Access: | https://dx.doi.org/10.3929/ethz-b-000101381 http://hdl.handle.net/20.500.11850/101381 |
Summary: | The accumulation of carbon within the Weddell Gyre and its exchanges across the gyre boundaries are investigated with three recent full-depth oceanographic sections enclosing this climatically important region. The combination of carbon measurements with ocean circulation transport estimates from a box inverse analysis reveals that deepwater transports associated with Warm Deep Water (WDW) and Weddell Sea Deep Water dominate the gyre's carbon budget, while a dual-cell vertical overturning circulation leads to both upwelling and the delivery of large quantities of carbon to the deep ocean. Historical sea surface pCO2 observations, interpolated using a neural network technique, confirm the net summertime sink of 0.044 to 0.058 ± 0.010 Pg C yr−1 derived from the inversion. However, a wintertime outgassing signal similar in size results in a statistically insignificant annual air-to-sea CO2 flux of 0.002 ± 0.007 Pg C yr−1 (mean 1998–2011) to 0.012 ± 0.024 Pg C yr−1 (mean 2008–2010) to be diagnosed for the ... : Global Biogeochemical Cycles, 29 (3) ... |
---|