Oxygen consumption in the Eastern Mediterranean

Roether, Wolfgang; Well, Roland

doi:10.1016/s0967-0637(00)00102-3

Cited by 60 publications

(42 citation statements)

References 28 publications

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“…This very rough figure is likely to be in the lower range of the real value because of the underestimation of the impact of anthropic activities. This significant load of allochthonous OC, which eventually reaches deep layers as DOC via dense water sinking, may contribute to the high oxygen utilization rates recorded in intermediate and deep layers of the MS which have been attributed to the oxidation of DOC (Christensen et al, 1989;Ribera d'Alcalá and Mazzocchi, 1999;Roether and Well, 2001;La Ferla et al, 2003). Data show that oxygen utilization rates were further enhanced during the years of the EMT (Klein et al, 2003;La Ferla et al, 2003, and references therein).…”

Section: Physical and Chemical Frameworkmentioning

confidence: 97%

Plankton in the open Mediterranean Sea: a review

et al. 2010

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Abstract. We present an overview of the plankton studies conducted during the last 25 years in the epipelagic offshore waters of the Mediterranean Sea. This quasi-enclosed sea is characterized by a rich and complex physical dynamics with distinctive traits, especially in regard to the thermohaline circulation. Recent investigations have basically confirmed the long-recognised oligotrophic nature of this sea, which increases along both the west-east and the north-south directions. Nutrient availability is low, especially for phosphorous (N:P up to 60), though this limitation may be buffered by inputs from highly populated coasts and from the atmosphere. Phytoplankton biomass, as chl a, generally displays low values (less than 0.2 µg chl a l −1 ) over large areas, with a modest late winter increase. A large bloom (up to 3 µg l −1 ) is observed throughout the late winter and spring exclusively in the NW area. Relatively high biomass values are recorded in fronts and cyclonic gyres. A deep chlorophyll maximum is a permanent feature for the whole basin, except during the late winter mixing. It is found at increasingly greater depths ranging from 30 m in the Alboran Sea to 120 m in the easternmost Levantine basin. Primary production reveals a west-east decreasing trend and ranges between 59 and 150 g C m −2 y −1 (in situ measurements). Overall, the basin is largely dominated by small autotrophs, microheterotrophs and egg-carrying copepod species. The microorganisms (phytoplankton, viruses, bacteria, flagellates and ciliates) and zooplankton components reveal a considerable diversity and

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Section: Physical and Chemical Frameworkmentioning

confidence: 97%

Plankton in the open Mediterranean Sea: a review

et al. 2010

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“…Helium-3 in the ocean originates from three different sources: (i) gas dissolution in equilibrium with atmospheric helium; (ii) addition by radioactive decay of tritium (called tritiugenic helium-3); and (iii) by injection of helium-3 into the oceans by the hydrothermal activity at deep sea spreading ridges, and also from the sediment above crusts by α-decay of heavy elements (called terrigenic helium-3). The most commonly used method of isolating the tritiugenic portion of helium-3 is the two-step procedure of Roether et al (1998) and Roether and Well (2001), using concurrent values of He, δ 3 He and neon (Ne) concentration, because the Ne generates a similar excess as the 3 He, but has no sources in the ocean interior. This methodology has already been applied on tritium data by Roether et al (1998Roether et al ( , 2013.…”

Section: Presentation Of Tracersmentioning

confidence: 99%

“…In this study, we simulate only the tritiugenic helium-3 (anthropogenic source), without representing the terrigenic helium-3 component (natural source). To isolate this tritiugenic helium-3 component in the observations, we apply the procedure of Roether et al (1998) and Roether and Well (2001).…”

Section: Tracer Boundary Conditionsmentioning

confidence: 99%

Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model

et al. 2015

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Abstract. This numerical study provides the first simulation of the anthropogenic tritium invasion and its decay product helium-3 ( 3 He) in the Mediterranean Sea. The simulation covers the entire tritium ( 3 H) transient generated by the atmospheric nuclear weapons tests performed in the 1950s and early 1960s and is run till 2011. Tritium, helium-3 and their derived age estimates are particularly suitable for studying intermediate and deep-water ventilation and spreading of water masses at intermediate/deep levels. The simulation is made using a high-resolution regional model NEMO (Nucleus for European Modelling of the Ocean), in a regional configuration for the Mediterranean Sea called MED12, forced at the surface with prescribed tritium evolution derived from observations. The simulation is compared to measurements of tritium and helium-3 performed along large-scale transects in the Mediterranean Sea during the last few decades on cruises of R/V Meteor: M5/6, M31/1, M44/4, M51/2, M84/3, and R/V Poseidon: 234. The results show that the input function used for the tritium generates a realistic distribution of the main hydrographic features of the Mediterranean Sea circulation. In the eastern basin, the results highlight the weak formation of Adriatic Deep Water in the model, which explains its weak contribution to the Eastern Mediterranean Deep Water (EMDW) in the Ionian sub-basin. It produces a realistic representation of the Eastern Mediterranean Transient (EMT) signal, simulating a deep-water formation in the Aegean subbasin at the beginning of 1993, with a realistic timing of deep-water renewal in the eastern basin.

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“…Before 1987, Bethoux (1989 estimated a remineralization rate close to 32.9 mg C m -2 d -1 with a 3% increase per year. This trend was revised by Roether and Well (2001) ) was still higher than previous ones. Moreover, considerably higher remineralization occurred after EMT events: 226.7 and 349.9 mg C m -2 d -1 in 1998 and 1999, respectively.…”

Section: Fig 2 -Surface Circulation Pattern and Distribution Of Cdpmentioning

confidence: 60%

Metabolic CO<sub>2</sub> production in the Mediterranean Sea: A case study for estimating carbon budget in the sea

Ferla¹,

Azzaro²

2004

Sci. Mar.

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SUMMARY: A synthesis of published metabolic CO 2 production rates determined in the water column of the Eastern Mediterranean Sea from 1993 to 1999 is reported with the aim of furnishing an overall picture of the remineralization processes occurring in the basin. The trends of the remineralization are also interpreted with respect to the so-called Eastern Mediterranean Transient (EMT) event. This study augments the sparse data set of respiration measurements, from oceanographic surveys, and highlights the tight coupling between biological processes and circulation patterns. In the photic zone, the rates decreased from West to East as well as from North to South. In the aphotic zone, the C remineralization trend followed the traditional routes of intermediate and deep waters in the Eastern Mediterranean Basin, and underwent the important modifications into the depths as a consequence of the EMT impact.

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Oxygen consumption in the Eastern Mediterranean

Cited by 60 publications

References 28 publications

Plankton in the open Mediterranean Sea: a review

Plankton in the open Mediterranean Sea: a review

Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model

Metabolic CO<sub>2</sub> production in the Mediterranean Sea: A case study for estimating carbon budget in the sea

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