Intact polar and core glycerol dibiphytanyl glycerol tetraether lipids in the Arabian Sea oxygen minimum zone: I. Selective preservation and degradation in the water column and consequences for the TEX86

2012 ◽  
Vol 98 ◽  
pp. 228-243 ◽  
Author(s):  
Stefan Schouten ◽  
Angela Pitcher ◽  
Ellen C. Hopmans ◽  
Laura Villanueva ◽  
Judith van Bleijswijk ◽  
...  
Keyword(s):  
Water Column ◽  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Tetraether Lipids ◽  
Selective Preservation ◽  
Oxygen Minimum

scholarly journals Flux and accumulation of sedimentary particles off the continental slope of Pakistan: a comparison of water column and seafloor estimates from the oxygen minimum zone, NE Arabian Sea

2013 ◽  
Vol 10 (7) ◽  
pp. 12417-12449
Author(s):  
H. Schulz ◽  
U. von Rad
Keyword(s):  
Water Column ◽  
Water Depth ◽  
Arabian Sea ◽  
Lower Boundary ◽  
Oxygen Minimum Zone ◽  
High Mass ◽  
Sediment Surface ◽  
Accumulation Rates ◽  
Minimum Zone ◽  
Oxygen Minimum

Abstract. Due to the lack of bioturbation, the laminated muds from the oxygen-minimum zone (OMZ) off Pakistan provide a unique opportunity to precisely determine the vertical and lateral sediment fluxes in the near shore part of the northeastern Arabian Sea, and to explore the effects of the margin topography and the low oxygen conditions on the accumulation of organic matter and other particles. West of Karachi, in the Hab river area of EPT and WPT (Eastern and Western PAKOMIN Traps), 16 short sediment profiles from water depths between 250 m and 1970 m on a depth transect crossing the OMZ (~ 120 to ~ 1200 m water depth) were investigated, and correlated on the basis of a thick, light-gray- to reddish-colored turbidite layer. Varve counting yielded a date for this layer of AD 1905 to 1888. We adopted the young age which agrees with 210Pb- dating, and used this isochronous stratigraphic marker bed to calculate sediment accumulation rates, that we could directly compare with the flux rates from the sediment traps installed within the water column above. All traps in the area show exceptionally high, pulsed winter fluxes of up to 5000 mg m−2 d−1 in this margin environment. The lithic flux at the sea floor is as high as 4000 mg m−2 d−1 , and agrees remarkably well with the bulk winter flux of material. This holds as well for the individual bulk components (organic carbon, calcium carbonate, opal, lithic fraction). However, the high winter flux events (HFE) by their extreme mass of remobilized matter terminated the recording in the shallow traps by clogging the funnels. Based on our comparisons, we argue that HFE for the past 5000 yr most likely occurred as regular events within the upper OMZ off Pakistan. Coarse fraction and foraminiferal accumulation rates from sediment surface samples along the Hab transect show distribution patterns that seem to be a function of water depth and distance from the shelf. Some of these sediment fractions show sudden shifts at the lower boundary of the OMZ. However, the potential effect of the OMZ on carbon preservation in the area would by masked by high mass of fine-grained matter laterally advected, and by the pulsed nature of the resuspension events.

Temporally invariable bacterial community structure in the Arabian Sea oxygen minimum zone

2014 ◽  
Vol 73 (1) ◽  
pp. 51-67 ◽  
Author(s):  
A Jain ◽  
M Bandekar ◽  
J Gomes ◽  
D Shenoy ◽  
RM Meena ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

Denitrification exceeds anammox as a nitrogen loss pathway in the Arabian Sea oxygen minimum zone

2010 ◽  
Vol 57 (3) ◽  
pp. 384-393 ◽  
Author(s):  
Silvia E. Bulow ◽  
Jeremy J. Rich ◽  
Hema S. Naik ◽  
Anil K. Pratihary ◽  
Bess B. Ward
Keyword(s):  
Arabian Sea ◽  
Nitrogen Loss ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

A 43 kyr record of protist communities and their response to oxygen minimum zone variability in the Northeastern Arabian Sea

2018 ◽  
Vol 496 ◽  
pp. 248-256 ◽  
Author(s):  
Kuldeep D. More ◽  
William D. Orsi ◽  
Valier Galy ◽  
Liviu Giosan ◽  
Lijun He ◽  
...  
Keyword(s):  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

The oxygen minimum zone in the Arabian Sea during 1995

1999 ◽  
Vol 46 (8-9) ◽  
pp. 1903-1931 ◽  
Author(s):  
J.M Morrison ◽  
L.A Codispoti ◽  
Sharon L Smith ◽  
Karen Wishner ◽  
Charles Flagg ◽  
...  
Keyword(s):  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum

Carbon processing at the deep-sea floor of the Arabian Sea oxygen minimum zone: A tracer approach

2013 ◽  
Vol 78 ◽  
pp. 45-58 ◽  
Author(s):  
Lara Pozzato ◽  
Dick van Oevelen ◽  
Leon Moodley ◽  
Karline Soetaert ◽  
Jack J. Middelburg
Keyword(s):  
Deep Sea ◽  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Sea Floor ◽  
Minimum Zone ◽  
Carbon Processing ◽  
Oxygen Minimum
Sign in / Sign up

Export Citation Format

Share Document