Methods in Oceanography
Papers 82
1 page of 9 pages (82 results)
#1Timothy F. Duda (WHOI: Woods Hole Oceanographic Institution)H-Index: 26
#2Andone C. Lavery (WHOI: Woods Hole Oceanographic Institution)H-Index: 15
Last. Cynthia J. Sellers (WHOI: Woods Hole Oceanographic Institution)H-Index: 5
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Abstract Understanding intrusive exchange at oceanic water mass fronts may depend on building data-constrained models of the processes, but obtaining the needed representative and comprehensive data is challenging. Acoustic imaging (remote sensing) is an attractive method for mapping the three-dimensional intrusion geometry to enable the required focused in situ sampling of the mixing processes in intrusions. The method depends on backscatter of sound from sharp interfaces and from microstructur...
2 CitationsSource
#1Gavin J. MacaulayH-Index: 13
#2Sindre VatneholH-Index: 3
Last. Egil OnaH-Index: 23
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Abstract Conventional ship-mounted vertically-oriented echosounders are poor at detecting organisms that are close to the sea surface. In contrast, omni-directional sonars can ensonify these near-surface waters unavailable to hull-mounted echosounders. If calibrated, sonars can provide quantitative biomass estimates of pelagic aggregations. However, for sonars that have not been designed as scientific and research instruments, the quantification and verification of the system performance is of h...
3 CitationsSource
#1Kresimir Williams (NMFS: National Marine Fisheries Service)H-Index: 8
#2Nathan Lauffenburger (NMFS: National Marine Fisheries Service)H-Index: 1
Last. Rick Towler (NMFS: National Marine Fisheries Service)H-Index: 6
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Abstract We present a method to automatically measure fish from images taken using a stereo-camera system installed in a large trawl (CamTrawl). Different visibility and fish density conditions were evaluated to establish accuracy and precision of image-based length estimates when compared with physical length measurements. The automated image-based length estimates compared well with the trawl catch values and were comparable with manual image processing in good visibility conditions. Greatest ...
9 CitationsSource
#2Kristín Ágústsdóttir (University of Iceland)H-Index: 1
Last. Guðrún Marteinsdóttir (University of Iceland)H-Index: 5
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Abstract Near-surface chlorophyll a concentration is a fundamental component of marine ecological processes, and its changes reflect the phytoplankton growth (primary productivity as well as loss due to grazing and sinking) feeding into higher trophic levels. Time series of measurements from several satellite sensors since late 1997 can be used as a proxy of chlorophyll a concentrations after calibrating against direct sea water measurements from oceanographic surveys. Previous studies indicate ...
#1Taavi Liblik (Tallinn University of Technology)H-Index: 9
#2Johannes KarstensenH-Index: 23
Last. Elena MauriH-Index: 15
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The contributions of autonomous underwater gliders as an observing platform in the in-situ global ocean observing system (GOOS) are investigated. The assessment is done in two ways: First, the existing in-situ observing platforms contributing to GOOS (floats, surface drifters, moorings, research/commercial ships) are characterized in terms of their current capabilities in sampling key physical and bio-geochemical oceanic processes. Next the gliders’ capabilities are evaluated in the context of k...
21 CitationsSource
#1Robert Drucker (UW: University of Washington)H-Index: 17
#2Stephen C. Riser (UW: University of Washington)H-Index: 33
Abstract Comparison of profiles from oxygen Optodes deployed on profiling floats with ship-based bottle casts taken at the time of deployment shows typical low biases of approximately 0 to −40 μmol kg −1 . Most proposed methods to correct these biases use linear or multiplicative corrections of the derived variable O 2 . Some of these methods depend on specific reference data such as deployment casts or air measurements. Here, we describe a versatile in situ method to recalculate O 2 directly fr...
6 CitationsSource
#1Davide Moroni (Istituto di Scienza e Tecnologie dell'Informazione)H-Index: 9
#2Gabriele Pieri (Istituto di Scienza e Tecnologie dell'Informazione)H-Index: 8
Last. Alessandro TonacciH-Index: 11
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Abstract The Sea is often a fragile environment to be protected against possible pollutants. In this context, the present work contributes to its safeguard by proposing a new buoy equipped with advanced sensors for the detection of oil spills. In particular, the buoy is provided with various sensors for the evaluation of both meteorological and marine parameters (e.g. waves, wind, temperature), and chemical/physical data acquired by an electronic nose system specifically designed for the detecti...
8 CitationsSource
#1Victoire M.C. Rérolle (University of Paris)H-Index: 7
#2Diana Ruiz-Pino (University of Paris)H-Index: 8
Last. Jianfang ChenH-Index: 1
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Abstract The suitability of the colorimetric method in a custom-made instrumental set-up and the commercial potentiometric SeaFET ® electrode sensor to measure pH in surface oceanic water in the Arctic was investigated during the Chinese Arctic Research Expedition (CHINARE) in summer 2014. The instruments were set up in parallel on the on-board underway seawater supply for 65 days, enabling comparison in various conditions in the Arctic Ocean from the Chukchi Sea to the ice-covered high latitude...
6 CitationsSource
#1Hannah R. Hiester (FSU: Florida State University)H-Index: 1
#2Steven L. Morey (FSU: Florida State University)H-Index: 19
Last. Chuanmin Hu (USF: University of South Florida)H-Index: 57
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Abstract In an effort to more fully employ underutilized satellite observations in ocean modeling, this work demonstrates a method for quantifying the agreement between time-evolving spatial features evident in fields of differing, but functionally related, variables that are more commonly compared qualitatively via visual inspection. This is achieved through application of the Modified Hausdorff Distance metric to the evaluation of ocean model simulations of surface salinity near riverine sourc...
#1Jui-Han Chang (NMFS: National Marine Fisheries Service)H-Index: 1
#2Deborah R. Hart (NMFS: National Marine Fisheries Service)H-Index: 4
Last. A. York (WHOI: Woods Hole Oceanographic Institution)H-Index: 4
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Abstract Optical methods for surveying populations are becoming increasingly popular. These methods often produce hundreds of thousands to millions of images, making it impractical to analyze all the images manually by human annotators. Computer vision software can rapidly annotate these images, but their error rates are often substantial, vary spatially and are autocorrelated. Hence, population estimates based on the raw computer automated counts can be seriously biased. We evaluated four estim...
Top fields of study
Computer vision
Remote sensing