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  • Salinity  (4)
  • 03. Hydrosphere::03.03. Physical::03.03.03. Interannual-to-decadal ocean variability
  • Global climate models
  • American Meteorological Society  (4)
  • UNESCO  (2)
  • National Institute of Oceanograhy and Fisheries (NIOF)  (1)
  • MDPI Publishing
  • 2005-2009  (7)
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  • 1
    Publication Date: 2021-06-08
    Description: The Aegean water masses and circulation structure are studied via two large-scale surveys performed during the late winters of 1988 and 1990 by the R/V Yakov Gakkel of the former Soviet Union. The analysis of these data sheds light on the mechanisms of water mass formation in the Aegean Sea that triggered the outflow of Cretan Deep Water (CDW) from the Cretan Sea into the abyssal basins of the eastern Mediterranean Sea (the so-called Eastern Mediterranean Transient). It is found that the central Aegean Basin is the site of the formation of Aegean Intermediate Water, which slides southward and, depending on their density, renews either the intermediate or the deep water of the Cretan Sea. During the winter of 1988, the Cretan Sea waters were renewed mainly at intermediate levels, while during the winter of 1990 it was mainly the volume of CDW that increased. This Aegean water mass redistribution and formation process in 1990 differed from that in 1988 in two major aspects: (i) during the winter of 1990 the position of the front between the Black Sea Water and the Levantine Surface Water was displaced farther north than during the winter of 1988 and (ii) heavier waters were formed in 1990 as a result of enhanced lateral advection of salty Levantine Surface Water that enriched the intermediate waters with salt. In 1990 the 29.2 isopycnal rose to the surface of the central basin and a large volume of CDW filled the Cretan Basin. It is found that, already in 1988, the 29.2 isopycnal surface, which we assume is the lowest density of the CDW, was shallower than the Kassos Strait sill and thus CDW egressed into the Eastern Mediterranean.
    Description: Published
    Description: 1841-1859
    Description: JCR Journal
    Description: reserved
    Keywords: Aegean Sea ; Water Masses ; 03. Hydrosphere::03.03. Physical::03.03.03. Interannual-to-decadal ocean variability
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Publication Date: 2020-11-19
    Description: A land surface model (LSM) has been included in the ECMWF Hamburg version 4 (ECHAM4) atmospheric general circulation model (AGCM). The LSM is an early version of the Organizing Carbon and Hydrology in Dynamic Ecosystems (ORCHIDEE) and it replaces the simple land surface scheme previously included in ECHAM4. The purpose of this paper is to document how a more exhaustive consideration of the land surface–vegetation processes affects the simulated boreal summer surface climate. To investigate the impacts on the simulated climate, different sets of Atmospheric Model Intercomparison Project (AMIP)-type simulations have been performed with ECHAM4 alone and with the AGCM coupled with ORCHIDEE. Furthermore, to assess the effects of the increase in horizontal resolution the coupling of ECHAM4 with the LSM has been implemented at different horizontal resolutions. The analysis reveals that the LSM has large effects on the simulated boreal summer surface climate of the atmospheric model. Considerable impacts are found in the surface energy balance due to changes in the surface latent heat fluxes over tropical and midlatitude areas covered with vegetation. Rainfall and atmospheric circulation are substantially affected by these changes. In particular, increased precipitation is found over evergreen and summergreen vegetated areas. Because of the socioeconomical relevance, particular attention has been devoted to the Indian summer monsoon (ISM) region. The results of this study indicate that precipitation over the Indian subcontinent is better simulated with the coupled ECHAM4–ORCHIDEE model compared to the atmospheric model alone.
    Description: Published
    Description: 255–278
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: JCR Journal
    Description: partially_open
    Keywords: Land Atmosphere interactions ; Global climate models ; 01. Atmosphere::01.01. Atmosphere::01.01.02. Climate
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Publication Date: 2017-04-04
    Description: In this paper results from the application of an ocean data assimilation (ODA) system, combining a multivariate reduced-order optimal interpolator (OI) scheme with a global ocean general circulation model (OGCM), are described. The present ODA system, designed to assimilate in situ temperature and salinity observations, has been used to produce ocean reanalyses for the 1962–2001 period. The impact of assimilating observed hydrographic data on the ocean mean state and temporal variability is evaluated. A special focus of this work is on the ODA system skill in reproducing a realistic ocean salinity state. Results from a hierarchy of different salinity reanalyses, using varying combinations of assimilated data and background error covariance structures, are described. The impact of the space and time resolution of the background error covariance parameterization on salinity is addressed.
    Description: This work has been funded by the ENACT Project (Contract EVK2-CT2001-00117) for A. Bellucci and P. Di Pietro, and partially by the ENSEMBLES Project (Contract GOCE-CT-2003-505539) for A. Bellucci.
    Description: Published
    Description: 3785-3807
    Description: 3.7. Dinamica del clima e dell'oceano
    Description: JCR Journal
    Description: reserved
    Keywords: ocean modelling ; data assimilation ; reanalysis ; upper ocean variability ; temperature ; Salinity ; 03. Hydrosphere::03.01. General::03.01.04. Ocean data assimilation and reanalysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2017-04-04
    Description: Ensemble experiments are performed with five coupled atmosphere–ocean models to investigate the potential for initial-value climate forecasts on interannual to decadal time scales. Experiments are started from similar model-generated initial states, and common diagnostics of predictability are used. We find that variations in the ocean meridional overturning circulation (MOC) are potentially predictable on interannual to decadal time scales, a more consistent picture of the surface temperature impact of decadal variations in the MOC is now apparent, and variations of surface air temperatures in the North Atlantic Ocean are also potentially predictable on interannual to decadal time scales, albeit with potential skill levels that are less than those seen for MOC variations. This intercomparison represents a step forward in assessing the robustness of model estimates of potential skill and is a prerequisite for the development of any operational forecasting system.
    Description: Published
    Description: 1195-1203
    Description: JCR Journal
    Description: reserved
    Keywords: Decadal Climate ; North Atlantic ; 03. Hydrosphere::03.01. General::03.01.03. Global climate models ; 03. Hydrosphere::03.02. Hydrology::03.02.05. Models and Forecasts ; 03. Hydrosphere::03.03. Physical::03.03.03. Interannual-to-decadal ocean variability
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    National Institute of Oceanograhy and Fisheries (NIOF)
    Publication Date: 2021-05-19
    Description: Bardawil Lagoon is a shallow oligotrophic hypersaline lake, located at the northern periphery of Sinai peninsula-Egypt, connected to SE Mediterranean Sea through two main openings known as Boughazes. Distribution of zooplankton in Bardawil Lagoon during 2004 was studied, not only in space and time but also with reference to species assemblages and environmental factors. Copepoda, Protozoa, and Mollusca were dominating the lagoon zooplankton community during the period of study with 58 identified forma. Zooplankton stock peaked during August and October with severe depletion in spring. Spatially, the maximum density occurred near the sea opening I. The lowest density and species richness were noticed at stations with high salinity. The community composition was highly changed with time series. Twenty new taxa were recorded during the study, whereas thirty three taxa disappeared from the lagoon along twenty years.
    Description: تعتبر جونة البردويل بحيرة عالية الملوحة، فقيرة فى الانتاجية الاولية، وقليلة العمق. وتقع هذه الجونة فى اقصى شمال جزيرة سيناء-مصر. وتتصل بجنوب شرق البحر المتوسط من خلال فتحتين. وقد تمت دراسة توزيع الهائمات الحيوانية خلال عام 2004 شهريا. وسجل 58 نوعا من الهائمات الحيوانية. وكانت مجدافيات الارجل والاوليات الحيوانية والرخويات هى الاكثر سيادة فى البحيرة. وبخاصة فى شهرى أغسطس وأكتوبر، بينما كان هناك فقر كبير فى كثافة هذه الكائنات فى ربيع ذلك العام. كما كانت أعلى كثافة للهائمات الحيوانية فى المحطات القريبة من البوغاز الغربى. وبينت الدراسة ان الملوحة كانت هى العامل المُحدد لتغير كثافة وتنوع الهائمات الحيوانية حيث تناسبت معها عكسيا. ظهر عشرون نوعا فى جونة البردويل أثناءالدراسة لم يتم تسجيلهم من قبل بينما اختفى ثلاثة وثلاثون نوعا على مدار عشرون عاما.
    Description: The Chief Editor: Prof. Fatma Aly Abd El-Razek E-mail: fatma_abdelrazek@hotmail.com
    Description: Published
    Description: Hypersaline lagoon
    Keywords: Hydrobiology ; Zooplankton ; Salinity ; Zooplankton ; Salinity ; Lagoons
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 210540 bytes
    Format: application/pdf
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  • 6
    Publication Date: 2021-05-19
    Description: This document is directed to the scientific research community and users of operational ocean data. It is also intended to provide an example and be a source of information to programmes such as the Global Ocean Observing System (GOOS) for developing and implementing end-to-end data management systems. The document is also directed towards Member States of IOC. It discusses how Member States can make contributions and how they can benefit from the GTSPP.
    Description: Published
    Description: temperature profile, salinity prifile, GTSPP
    Keywords: Oceanography ; Salinity ; Temperature data ; Temperature measurement ; Ocean circulation ; Salinity ; Salinity data ; Salinity measurement ; Salinity profiles ; Salinity scales
    Repository Name: AquaDocs
    Type: Report
    Format: 33
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  • 7
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    UNESCO
    Publication Date: 2021-01-30
    Description: The Integrated Global Observing Strategy Partnership (IGOS-P) established, in 1999, a thematic approach to the implementation of the IGOS. Recognising that other themes will emerge, the “Ocean Theme” was chosen to be the “pathfinder” in this approach and an Ocean Theme Team was assembled to formulate guidance. One goal of the Ocean Theme Team is to consider and study the full range of current and planned observations, while identifying potential gaps in future observations that might compromise ocean observational records. This document presents a proposed set of long-term ocean observations and identifies a number of challenges for the improvement of knowledge about both the oceans and observing techniques. The overall strategy is to create an observing system for the oceans that serves the research and operational oceanographic communities. The set of observations is based on an evaluation of the range of requirements that have already been presented by GOOS, GCOS, and GODAE. The next five years must include development of institutional structures committed to (1) managing the total data flow (in situ as well as satellite); (2) managing the production, distribution and quality assessment of relevant data products; and (3) working with end-users to ensure that the evolving system is responsive to their needs. It is also recognised that observation protocols evolve with time and, therefore, that the stated observational requirements will need to be reviewed in future. It is the recognised applications that ultimately drive the shape of the requirements for the ocean observing system. The observations on which we focus here are needed to address important issues in ocean science, and through combinations of measurements and models, to support the production of an extensive range of products for a broad community of users. The applications are directly linked to societal needs, including among other things numerical weather prediction, seasonal-to-interannual climate forecasts, and climate assessment. The data are needed for deriving fields of information about the ocean and for initialising and validating the models used to derive other products. Aside from observations we also need to improve, through the Global Ocean Data Assimilation Experiment (GODAE) and the Ocean Biology Project, how we assimilate the data into models.
    Description: Published
    Description: Ocean Biology, Ocean topography, Gravity, Geold, atmospheric pressure
    Keywords: Oceanography ; Salinity ; Surface temperature ; Wind vectors ; Sea ice ; Salinity
    Repository Name: AquaDocs
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