The short timescale variability of the oxygen inventory in the NE Black Sea slope water
-
Published:2018-12-21
Issue:6
Volume:14
Page:1567-1579
-
ISSN:1812-0792
-
Container-title:Ocean Science
-
language:en
-
Short-container-title:Ocean Sci.
Author:
Ostrovskii Alexander G.ORCID, Zatsepin Andrey G., Solovyev Vladimir A., Soloviev Dmitry M.
Abstract
Abstract. Warm winters have recently become common over the Black Sea, leading to the
risk of shoaling oxygen penetration. The insufficient supply of oxygen to the
near-bottom layer may result in a decrease in faunal abundance. However,
there is a lack of data on the temporal variations in oxygen throughout the
water column over short timescales of hours to weeks. In this paper, new
observations over the upper part of the NE Black Sea continental slope are
presented. Regular, frequent measurements were performed using a moored
profiler from January to early March 2016. The profiling allowed for direct
observations of the temperature in the cold intermediate layer (CIL),
pycnocline structure, current velocity, and oxygen stratification and in
particular, the depths of hypoxia onset. The average local oxygen inventory
below a depth of 30 m was 24.9 mol m−2. Relatively high/low oxygen
inventory cases were related to the thin/thick main pycnocline, which was
associated with the onshore/offshore location of the Black Sea Rim Current.
The pycnocline hindered the vertical transport of oxygenated water to the
CIL. The vertical displacements of the hypoxia onset depth ranged from
97 to 170 m, while the shelf edge depth in this region usually ranged from
90 to 100 m. Intermittently, the hypoxia boundary depth fluctuated on two timescales: ∼17 h due to inertial oscillations and 3–7 days due to
current meanders and eddies.
Publisher
Copernicus GmbH
Subject
Cell Biology,Developmental Biology,Embryology,Anatomy
Reference43 articles.
1. Arashkevich, E., Ostrovskii, A., and Solovyev, V.: Observations of water
column habitats by combining acoustic backscatter data and zooplankton
sampling in the NE Black Sea, 40th CIESM Congress Proceedings, 28 October–1
November 2013, Marseille, France, 40, 722, 2013. 2. Belokopytov, V.: Interannual variations of the renewal of waters of the cold
intermediate layer in the black sea for the last decades, Phys. Oceanogr.,
20, 347–355, https://doi.org/10.1007/s11110-011-9090-x, 2011. 3. Bondur, V. G., Serebryany, A. N., and Zamshin, V. V.: Anomalous train of
internal waves of record heights on the shelf of the Black Sea, generated by
the atmospheric front, Dokl. Earth Sci., 483, 1519–1523, 2018. 4. Capet, A., Barth A., Beckers, J.-M., and Grégoire, M.: Interannual
variability of Black Sea's hydrodynamics and connection to atmospheric
patterns, Deep-Sea Res. Pt. II, 77–80, 128–142,
https://doi.org/10.1016/j.dsr2.2012.04.010, 2012. 5. Capet, A., Stanev, E. V., Beckers, J.-M., Murray, J. W., and Grégoire,
M.: Decline of the Black Sea oxygen inventory, Biogeosciences, 13,
1287–1297, https://doi.org/10.5194/bg-13-1287-2016, 2016.
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|