Dissolved oxygen distribution in south atlantic ocean along 29-30°s, from brazil to south africa - minimum layer depth variation
01 Jan 2010-
About: The article was published on 2010-01-01 and is currently open access. It has received 2 citations till now. The article focuses on the topics: Thermohaline circulation.
Citations
More filters
TL;DR: In this paper , the vertical profile of dissolved oxygen and associated water variables were measured in the head of the Pasur-Rupsha estuary of Bangladesh and the observed stratification pattern was remarkably triggered by a relatively high concentration of DO in the bottom layer than that of the surface layer during both the high and low tides in most of the study periods.
1 citations
TL;DR: In this article , the authors investigated the stress corrosion cracking susceptibility of the armour layer in FeCO3 supersaturated seawater, addressing the influence of CO2 partial pressure and strain rate, at 25 °C and at 40 °C, using the slow strain rate test.
1 citations
References
More filters
27 Jan 1999
TL;DR: The Automatic Determination of Dissolved Organic Carbon (DOC) by Wet Chemical Oxidation is described in this paper, along with the results of HPLC analysis of photosynthetic pigments.
Abstract: Sampling and Sampling Techniques. Filtration and Storage. Determination of Salinity. Determination of Oxygen. Determination of Hydrogen Sulphide. Determination of Thiosulphate and Sulfur. Determination of pH. Determination of Alkalinity and Total Carbonate. Determination of pCO2. Determination of Nutrients. Determination of Major Constituents. Determination of Trace Elements. Determination of Natural Radioactive Tracers. In Situ Registration of pH and Oxygen. Determination of Dissolved Organic Carbon (DOC) by High Temperature Combustion. The Automatic Determination of Dissolved Organic Carbon (DOC) by Wet Chemical Oxidation. Determination of Particulate Organic Carbon and Nitrogen. Preparation of Lipophilic Organic Seawater Concentrates. Adsorption Chromatography of Organic Seawater Concentrates. Clean-up of Organic Seawater Concentrates by HPLC. Fluorimetric Determination of Dissolved Petroleum Residues. Determination of Selected Organochlorines in Seawater. Determination of Volatile Halocarbons in Seawater. Determination of Dimethlysulfide. Determination of Marine Humics. Determination of Amino Acids and Carbohydrates. HPLC Analysis of Photosynthetic Pigments.
7,247 citations
TL;DR: In this paper, the authors used the Euler-Lagrangian method to examine water movements within the layer of minimum oxygen concentration and estimate local oxygen consumption rates for 15 regions of the global ocean.
Abstract: By using the Euler-Lagrangian method, we examine water movements within the layer of minimum oxygen concentration and estimate local oxygen consumption rates for 15 regions of the global ocean. To do this, a number of labeled particles (which represent water parcels) are deployed at the center of a grid with 15 depth levels and tracked backward in time for 50 years in a three-dimensional velocity field. We assume that a particle picks up oxygen when it encounters the point of maximum oxygen concentration along the 50 years segment of its path. We introduce a contribution rate from waters distributed throughout the global ocean to the oxygen concentration of a local layer under consideration. Water parcels which are assumed to pick up oxygen within the oxygen minimum layer of an oceanic region under consideration make a very small contribution to the overall oxygen concentration of this layer. In addition, these parcels move out of the layer and water parcels from the upper layers take their place. The averaged Lagrangian local oxygen consumption rate is 0.033 ml/l/yr for the depth of the oxygen minimum layer, 0.20 ml/l/yr at 100 m depth (euphotic layer), 0.043 ml/l/yr for layers from 150 m to 800 m depth and 0.012 ml/l/yr for deep layers from 800 m to 3000 m. The present Lagrangian numerical experiment produces a maximum difference between observed and calculated concentrations of oxygen and, therefore, a maximum oxygen consumption rate. Although the present method has an ambiguity as to how oxygen is picked up, we nevertheless were able to identify regions in which the water parcels pick up oxygen of maximum concentration. We found that the South Equatorial Current (SEC) transports oxygen of higher concentration to the middle latitude regions of both the North Atlantic and the North Pacific across the equator.
8 citations
TL;DR: In MS 335, situated below the Equator, near the African coast, the oxygen/temperature distribution differs from the two former squares in that the dissolved oxygen value decreased steadily, and no oxygen minimum was found down to a depth where the water temperature was 6°C.
Abstract: While examining historical data on dissolved oxygen in the Canary Current area and the Central Atlantic Ocean (areas of activity of the UNDP/FAO Regional Fisheries Survey in West Africa), a quite different pattern of distribution was found in the dissolved oxygen/water temperature relationship in two adjacent Marsden squares (MS)1, 074 and 038. Not only were the dissolved oxygen values in MS 038 considerably lower than in MS 074 but, in the former square, the oxgen/temperature distribution showed 2 dissolved oxygen minima, the latter only 1 minimum. In MS 335, situated below the Equator, near the African coast, the oxygen/temperature distribution differs from the two former squares in that the dissolved oxygen value decreased steadily, and no oxygen minimum was found down to a depth where the water temperature was 6°C.
4 citations