scholarly journals Temperature Dependence of Apparent Respiratory Quotients and Oxygen Penetration Depth in Contrasting Lake Sediments

2017 ◽  
Vol 122 (11) ◽  
pp. 3076-3087 ◽  
Author(s):  
Sebastian Sobek ◽  
Cristian Gudasz ◽  
Birgit Koehler ◽  
Lars J. Tranvik ◽  
David Bastviken ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Lake Sediments ◽  
Penetration Depth ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

scholarly journals Decline of the Black Sea oxygen inventory

2016 ◽  
Vol 13 (4) ◽  
pp. 1287-1297 ◽  
Author(s):  
Arthur Capet ◽  
Emil V. Stanev ◽  
Jean-Marie Beckers ◽  
James W. Murray ◽  
Marilaure Grégoire
Keyword(s):  
Spatial Variability ◽  
Penetration Depth ◽  
Black Sea ◽  
The Black Sea ◽  
Nutrient Loads ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth ◽  
Atmospheric Warming ◽  
The Stability ◽  
Near Future

Abstract. We show that from 1955 to 2015, the inventory of oxygen in the Black Sea has decreased by 44 % and the basin-averaged oxygen penetration depth has decreased from 140 m in 1955 to 90 m in 2015, which is the shallowest annual value recorded during that period. The oxygenated Black Sea surface layer separates the world's largest reservoir of toxic hydrogen sulfide from the atmosphere. The threat of chemocline excursion events led to hot debates in the past decades arguing on the vertical stability of the Black Sea oxic/suboxic interface. In the 1970s and 1980s, when the Black Sea faced severe eutrophication, enhanced respiration rates reduced the thickness of the oxygenated layer. Re-increasing oxygen inventory in 1985–1995 supported arguments in favor of the stability of the oxic layer. Concomitant with a reduction of nutrient loads, it also supported the perception of a Black Sea recovering from eutrophication. More recently, atmospheric warming was shown to reduce the ventilation of the lower oxic layer by lowering cold intermediate layer (CIL) formation rates. The debate on the vertical migration of the oxic interface also addressed the natural spatial variability affecting Black Sea properties when expressed in terms of depth. Here we show that using isopycnal coordinates does not overcome the significant spatial variability of oxygen penetration depth. By considering this spatial variability, the analysis of a composite historical set of oxygen profiles evidenced a significant shoaling of the oxic layer, and showed that the transient "recovery" of the 1990s was mainly a result of increased CIL formation rates during that period. As both atmospheric warming and eutrophication are expected to increase in the near future, monitoring the dynamics of the Black Sea oxic layer is urgently required to assess the threat of further shoaling.

Authigenic uranium: Relationship to oxygen penetration depth and organic carbon rain

2005 ◽  
Vol 69 (1) ◽  
pp. 95-108 ◽  
Author(s):  
James McManus ◽  
William M. Berelson ◽  
Gary P. Klinkhammer ◽  
Douglas E. Hammond ◽  
Chris Holm
Keyword(s):  
Organic Carbon ◽  
Penetration Depth ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

Simple prediction of oxygen penetration depth in biofilms for wastewater treatment

2004 ◽  
Vol 19 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Kazuaki Hibiya ◽  
Jun Nagai ◽  
Satoshi Tsuneda ◽  
Akira Hirata
Keyword(s):  
Wastewater Treatment ◽  
Penetration Depth ◽  
Oxygen Penetration ◽  
Oxygen Penetration Depth

Temperature dependence of the magnetic penetration depth in Nb, NbCN and YBa2Cu3O7-δ thin films

1991 ◽  
Vol 169 (1-4) ◽  
pp. 671-672 ◽  
Author(s):  
S.M. Anlage ◽  
B.W. Langley ◽  
G. Deutscher ◽  
R.W. Simon ◽  
J.M. Murduck ◽  
...  
Keyword(s):  
Thin Films ◽  
Temperature Dependence ◽  
Penetration Depth ◽  
Magnetic Penetration Depth ◽  
Magnetic Penetration

Temperature dependence of the magnetic penetration depth in the high-TcsuperconductorBa2YCu3O9−δ: Evidence for conventionals-wave pairing

1987 ◽  
Vol 36 (4) ◽  
pp. 2386-2389 ◽  
Author(s):  
D. R. Harshman ◽  
G. Aeppli ◽  
E. J. Ansaldo ◽  
B. Batlogg ◽  
J. H. Brewer ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Penetration Depth ◽  
Magnetic Penetration Depth ◽  
Wave Pairing ◽  
Magnetic Penetration

scholarly journals Denitrification Temperature Dependence in Remote, Cold, and N-Poor Lake Sediments

2018 ◽  
Vol 54 (2) ◽  
pp. 1161-1173 ◽  
Author(s):  
Carlos Palacin-Lizarbe ◽  
Lluís Camarero ◽  
Jordi Catalan
Keyword(s):  
Temperature Dependence ◽  
Lake Sediments
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