Analysis and Modeling Using Multi-Year Satellite Observations in the Aegean and Eastern Mediterranean Seas PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
Our objective was to understand how upper ocean processes, such as internal waves, seasonal-to-interannual variations of the circulation, eddy variability, SST, and wind forcing in the Aegean Sea affect mixing and temperature in the upper ocean. An analysis of modeled and observed sea surface temperatures was submitted to the Journal of Geophysical Research - Oceans in October 2006 and is under review (abstract below). In addition, comparisons between the buoy winds and QuikSCAT in the Aegean Sea were used to optimize a mapping, algorithm for the new higher-resolution (12.5 km) QuikSCAT winds. A relevant finding is that, for daily-averaged winds, mapped QuikSCAT winds are as accurate as an anemometer at about 100 km from a given location. This analysis is being incorporated in a manuscript describing the mapping algorithm and its verification in a manuscript in preparation.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
Our objective was to understand how upper ocean processes, such as internal waves, seasonal-to-interannual variations of the circulation, eddy variability, SST, and wind forcing in the Aegean Sea affect mixing and temperature in the upper ocean. An analysis of modeled and observed sea surface temperatures was submitted to the Journal of Geophysical Research - Oceans in October 2006 and is under review (abstract below). In addition, comparisons between the buoy winds and QuikSCAT in the Aegean Sea were used to optimize a mapping, algorithm for the new higher-resolution (12.5 km) QuikSCAT winds. A relevant finding is that, for daily-averaged winds, mapped QuikSCAT winds are as accurate as an anemometer at about 100 km from a given location. This analysis is being incorporated in a manuscript describing the mapping algorithm and its verification in a manuscript in preparation.
Author: Yosef Ashkenazy
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Book Description
Recently (%7E1990) a new source of deep water formation in the Eastern Mediterranean was found in the southern part of the Aegean sea. Till then, the only source of deep water formation in the Eastern Mediterranean was in the Adriatic sea; the rate of the deep water formation of the new Aegean source is 1 Sv, three times larger than the Adriatic source. We develop a simple 3 box-model to study the stability of the thermohaline circulation of the Eastern Mediterranean sea. The 3 boxes represent the Adriatic sea, Aegean sea, and the Ionian sea. The boxes exchange heat and salinity and may be described by a set of nonlinear differential equations. We analyze these equations and find that the system may have one, two, or four stable flux states. We consider two cases for which the temperatures of the boxes are (i) fixed or (ii) variable. After setting the parameters to correspond to the Eastern Mediterranean we find that the system has two stable states, one with (i) two thermally dominant sources of deep water formation in the Adriatic and Aegean and the other with (ii) a salinity dominant source of deep water formation in the Adriatic and a thermally dominant source in the Aegean. While the Adriatic thermally dominant source is comparable to the observed flux of 0.3 Sv the Aegean source has much smaller flux than the observed value. This situation is analogous to the state of the thermohaline circulation pre 1990 where the only source of deep water formation was in the Adriatic. If we decrease the atmospheric temperature of the Aegean box by 2 0 C, in accordance with recent observations, we find that the deep water formation of the Aegean increases significantly to a value comparable to the recently observed flux. Our model also suggests that under a different scenario where the salinity flux of the Aegean box is positive instead of negative, the drop in atmospheric temperature over the Aegean may not result in the formation of a new source of deep water.
Author:
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ISBN: 9783845450926
Category :
Languages : en
Pages : 0
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Author: P.M. Malanotte-Rizzoli
Publisher: Springer Science & Business Media
ISBN: 9401147965
Category : Science
Languages : en
Pages : 552
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Book Description
This book is the outcome of a NATO Advanced Research Workshop on "The Eastern Mediterranean as a laboratory basin for the assessment of contrasting ecosystems" that was held in Kiev, Ukraine, March 23-27, 1998. The scientific rationale of the workshop can be summarized as follows. The Eastern Mediterranean is the most nutrient impoverished and oligotrophic large water body known. There is a well-defined eastward trend in nutrient ratios over the entire Mediterranean that starts at the Gibraltar Straits and, through the western basin, proceeds to the Ionian and Levantine Seas. Supply of nutrients to the entire Mediterranean is limited by inputs from the North Atlantic and various river systems along the sea. The unique feature of the Mediterranean is the presence of an eastward longitudinal trend in available nitrate/phosphate ratios. This apparently induces a west-to-east variation in the structure of the pelagic food web and trophic interactions. In this context the Mediterranean, and in particular its Eastern basin, provides probably a unique platform to explore the hypotheses related to the suggested phosphate-limitation on production and to the shift between "microbial" and "classical" modes of operation of the photic food web. The major exception of the overall oligotrophic nature of the Eastern Mediterranean is the highly eutrophic system of the Northern Adriatic Sea. Here, during the last two decades the discharges of the northern rivers (especially of the Po), together with municipal sewage, have led to a very marked increase of nutrients and subsequent imponent eutrophication events.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309083400
Category : Science
Languages : en
Pages : 137
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Book Description
Concerns over the potential ecological effects of fishing have increased with the expansion of fisheries throughout the marine waters of the United States. Effects of Trawling and Dredging on Seafloor Habitat describes how assessment of fishing impacts depends on gear type, number and location of bottom tows, and the physical and biological characteristics of seafloor habitats. Many experimental studies have documented acute, gear-specific effects of trawling and dredging on various types of habitat. These studies indicate that low mobility, long-lived species are more vulnerable to towed fishing gear than short-lived species in areas where the seabed is often disturbed by natural phenomena. Trawling and dredging may also change the composition and productivity of fish communities dependent on seafloor habitats for food and refuge. The scale of these impacts depends on the level of fishing effort. This volume presents color maps of fishing effort for all regions with significant bottom trawl or dredge fisheries-the first time that such data has been assembled and analyzed for the entire nation.
Author: P.M. Malanotte-Rizzoli
Publisher: Springer Science & Business Media
ISBN: 9401108706
Category : Science
Languages : en
Pages : 449
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Book Description
One of the most crucial but still very poorly understood topics of oceanographic science is the role of ocean processes in contributing to the dynamics of climate and global change. This book presents a series of high level lectures on the major categories of ocean/atmosphere processes. Three of these major issues are the focus of the lectures: (1) air--sea interaction processes; (2) water mass formation, dispersion and mixing; (3) general circulation, with specific emphasis on the thermohaline component. Global examples in the world ocean are provided and discussed in the lectures. In parallel, the Mediterranean Sea is a laboratory basin in providing analogues of the above global processes relevant to climate dynamics. They include the Mediterranean thermohaline circulation with its own `conveyor belt'; intermediate and deep water mass formation and transformations, dispersion and mixing. No other book in the field provides a review of fundamental lectures on these processes, coupled with global examples and their Mediterranean analogues.
Author: R. N. Gibson
Publisher: CRC Press
ISBN: 1134523149
Category : Science
Languages : en
Pages : 981
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Book Description
Interest in oceanography and marine biology and its relevance to global environmental issues continues to increase, creating a demand for authoritative reviews that summarize recent research. Oceanography and Marine Biology: An Annual Review has catered to this demand since its foundation, by the late Harold Barnes, more than 40 years ago. It is an
Author: Vittorio Barale
Publisher: Springer Science & Business Media
ISBN: 1402067720
Category : Technology & Engineering
Languages : en
Pages : 530
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Book Description
Here is a review of the current potential of Earth Observations that devotes particular attention to the challenges posed by the European Seas. The assessment of surface parameters by means of passive techniques – which measure reflected visible and near-infrared sunlight, or surface emissions in the thermal infrared or microwave spectral regions – is addressed. Active techniques – which use transmitted impulses of visible or microwave radiation – are covered as well.
Author: Christos L. Anagnostou
Publisher: Springer Nature
ISBN: 3031594150
Category :
Languages : en
Pages : 418
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Book Description
Author: Simona Masina
Publisher: Frontiers Media SA
ISBN: 2889767108
Category : Science
Languages : en
Pages : 219
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Book Description
