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  1. Book ; Online ; E-Book: Oceans

    Jacques, Guy / Tréguer, Paul / Mercier, Herlé

    evolving concepts

    (Oceanography and marine ecology)

    2020  

    Author's details Guy Jacques, Paul Tréguer and Herlé Mercier
    Series title Oceanography and marine ecology
    Language English
    Size 1 Online-Ressource (298 Seiten)
    Publisher ISTE
    Publishing place London
    Publishing country United States
    Document type Book ; Online ; E-Book
    Note Description based on publisher supplied metadata and other sources
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    HBZ-ID HT020883911
    ISBN 978-1-119-81802-1 ; 9781789450033 ; 1-119-81802-8 ; 1789450039
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Book ; Online: Biogeochemistry and Genomics of Silicification and Silicifiers

    Gehlen, Marion / Baines, Stephen / Moriceau, Brivaëla / Tréguer, Paul / Tréguer, Paul

    2019  

    Keywords Science: general issues ; Oceanography (seas) ; Silicon cycle ; biogenic silica ; diatom ; isotope ; Bolidophycae ; Sponge (Porifera) ; Nanostructured silica ; Anthropogenic pressure
    Size 1 electronic resource (187 pages)
    Publisher Frontiers Media SA
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021231244
    ISBN 9782889630851 ; 2889630854
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  3. Book ; Conference proceedings: The Southern Ocean

    Tréguer, Paul

    climatic changes and the cycle of carbon

    (Deep sea research : Pt. 2, Topical studies in oceanography ; ...)

    2002  

    Event/congress SO-JGOFS International Symposium: Climatic Changes and the Cycle of Carbon (3, 2000.07.08-12, BrestFrance)
    Author's details guest ed.: Paul Tréguer
    Series title Deep sea research : Pt. 2, Topical studies in oceanography
    ...
    Language English
    Publisher Pergamon
    Publishing place Oxford u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  4. Book ; Conference proceedings: The Southern Ocean

    Tréguer, Paul

    : climatic changes and the cycle of carbon

    (Deep sea research : Pt. 2, Topical studies in oceanography ; 49.2002,16)

    2002  

    Event/congress SO-JGOFS International Symposium: Climatic Changes and the Cycle of Carbon (3, 2000.07.08-12, BrestFrance)
    Author's details guest ed.: Paul Tréguer .̤
    Series title Deep sea research : Pt. 2, Topical studies in oceanography ; 49.2002,16
    Language English
    Size IV S., S. 3103 - 3407, Ill., graph. Darst
    Publisher Pergamon
    Publishing place Oxford u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  5. Book ; Conference proceedings: The Southern Ocean

    Tréguer, Paul

    : climatic changes and the cycle of carbon

    (Deep sea research : Pt. 2, Topical studies in oceanography ; 49.2002,9/10)

    2002  

    Event/congress SO-JGOFS International Symposium: Climatic Changes and the Cycle of Carbon (3, 2000.07.08-12, BrestFrance)
    Author's details guest ed.: Paul Tréguer
    Series title Deep sea research : Pt. 2, Topical studies in oceanography ; 49.2002,9/10
    Language English
    Size IV S., S. 1597 - 1961, Ill., graph. Darst., Kt
    Publisher Pergamon
    Publishing place Oxford u.a.
    Document type Book ; Conference proceedings
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  6. Article: The world ocean silica cycle.

    Tréguer, Paul J / De La Rocha, Christina L

    Annual review of marine science

    2013  Volume 5, Page(s) 477–501

    Abstract: Over the past few decades, we have realized that the silica cycle is strongly intertwined with other major biogeochemical cycles, like those of carbon and nitrogen, and as such is intimately related to marine primary production, the efficiency of carbon ... ...

    Abstract Over the past few decades, we have realized that the silica cycle is strongly intertwined with other major biogeochemical cycles, like those of carbon and nitrogen, and as such is intimately related to marine primary production, the efficiency of carbon export to the deep sea, and the inventory of carbon dioxide in the atmosphere. For nearly 20 years, the marine silica budget compiled by Tréguer et al. (1995) , with its exploration of reservoirs, processes, sources, and sinks in the silica cycle, has provided context and information fundamental to study of the silica cycle. Today, the budget needs revisiting to incorporate advances that have notably changed estimates of river and groundwater inputs to the ocean of dissolved silicon and easily dissolvable amorphous silica, inputs from the dissolution of terrestrial lithogenic silica in ocean margin sediments, reverse weathering removal fluxes, and outputs of biogenic silica (especially on ocean margins and in the form of nondiatomaceous biogenic silica). The resulting budget recognizes significantly higher input and output fluxes and notes that the recycling of silicon occurs mostly at the sediment-water interface and not during the sinking of silica particles through deep waters.
    MeSH term(s) Environmental Monitoring/methods ; Oceans and Seas ; Seawater/chemistry ; Silicon Dioxide/chemistry
    Chemical Substances Silicon Dioxide (7631-86-9)
    Language English
    Publishing date 2013
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2458404-6
    ISSN 1941-0611 ; 1941-1405
    ISSN (online) 1941-0611
    ISSN 1941-1405
    DOI 10.1146/annurev-marine-121211-172346
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Early evaluation of coastal nutrient over-enrichment: new procedures and indicators.

    Goberville, Eric / Beaugrand, Grégory / Sautour, Benoit / Tréguer, Paul

    Marine pollution bulletin

    2011  Volume 62, Issue 8, Page(s) 1751–1761

    Abstract: Recent studies have provided compelling evidence for an accelerated anthropogenic impact on coastal systems, resulting in intense inputs of materials and nutrients from the continent. This has led scientists and policymakers to encourage the ... ...

    Abstract Recent studies have provided compelling evidence for an accelerated anthropogenic impact on coastal systems, resulting in intense inputs of materials and nutrients from the continent. This has led scientists and policymakers to encourage the implementation of monitoring programmes, which have resulted in the multiplicity of datasets. However surprisingly, only a few attempts have been made to couple observations with statistical and mathematical tools to detect, as soon as the data become available perturbations in coastal systems. Here, we propose new mathematical procedures to evaluate the state of a system, based on the building of relative reference state and indicators of nutrient over-enrichment. The techniques were tested in some French coastal systems using data from the programme SOMLIT. Applied to this dataset, the multivariate procedures rapidly identified and evaluated anthropogenic nutrient anomalies from the continent on three sites (Wimereux, Roscoff and Villefranche-sur-Mer) from 1997 onwards.
    MeSH term(s) Ecosystem ; Environmental Monitoring/methods ; Environmental Monitoring/standards ; France ; Models, Theoretical ; Multivariate Analysis ; Nitrogen/analysis ; Phosphorus/analysis ; Reference Values ; Seawater/analysis ; Seawater/chemistry ; Time Factors
    Chemical Substances Phosphorus (27YLU75U4W) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2011-08
    Publishing country England
    Document type Evaluation Studies ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2001296-2
    ISSN 1879-3363 ; 0025-326X
    ISSN (online) 1879-3363
    ISSN 0025-326X
    DOI 10.1016/j.marpolbul.2011.05.024
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Evaluation of coastal perturbations: A new mathematical procedure to detect changes in the reference state of coastal systems

    Goberville, Eric / Beaugrand, Grégory / Sautour, Benoit / Tréguer, Paul

    Ecological indicators. 2011 Sept., v. 11, no. 5

    2011  

    Abstract: The pressure exerted by human activities on living systems has become so intense that it is inspiring the inception of a global network of monitoring of the biosphere and the use of robust statistical procedures to detect potential changes. Here, we ... ...

    Abstract The pressure exerted by human activities on living systems has become so intense that it is inspiring the inception of a global network of monitoring of the biosphere and the use of robust statistical procedures to detect potential changes. Here, we propose a new multivariate non-parametric procedure, based on the Mahalanobis generalised distance and a simplification of the multiple response permutation procedure to identify rapidly changes in any natural systems. The procedure can be virtually coupled on all monitoring programmes and is not influenced by missing data, a common feature found in many ecological databases. In France, physical, chemical and biological variability of coastal waters have been monitored since 1997 by the SOMLIT Network. Applied to this data set, this technique enabled a first quantification of the impacts of human disturbance through changes in the concentration of nutrients. Our results revealed how climate may interact with anthropogenic pressure to alter coastal marine systems and suggest a synergism between nutrient enrichment, human activities and local climatic conditions. Indeed some effects of climate (e.g. insolation duration – increase in duration of daylight) may attenuate the fertility of coastal systems, while some others (e.g. precipitation) amplify the human signals.
    Keywords anthropogenic activities ; biosphere ; climatic factors ; coastal water ; data collection ; databases ; humans ; monitoring ; nutrients ; solar radiation ; synergism ; France
    Language English
    Dates of publication 2011-09
    Size p. 1290-1300.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2036774-0
    ISSN 1470-160X
    ISSN 1470-160X
    DOI 10.1016/j.ecolind.2011.02.002
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 7436: Show issues

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  9. Book ; Online: Water mass distributions and transports for the 2014 GEOVIDE cruise in the North Atlantic

    García-Ibáñez, Maribel I. / Pérez, Fiz F. / Lherminier, Pascale / Zunino, Patricia / Mercier, Herlé / Tréguer, Paul

    eISSN: 1726-4189

    2018  

    Abstract: We present the distribution of water masses along the GEOTRACES-GA01 section during the GEOVIDE cruise, which crossed the subpolar North Atlantic Ocean and the Labrador Sea in the summer of 2014. The water mass structure resulting from an extended ... ...

    Abstract We present the distribution of water masses along the GEOTRACES-GA01 section during the GEOVIDE cruise, which crossed the subpolar North Atlantic Ocean and the Labrador Sea in the summer of 2014. The water mass structure resulting from an extended optimum multiparameter (eOMP) analysis provides the framework for interpreting the observed distributions of trace elements and their isotopes. Central Waters and Subpolar Mode Waters (SPMW) dominated the upper part of the GEOTRACES-GA01 section. At intermediate depths, the dominant water mass was Labrador Sea Water, while the deep parts of the section were filled by Iceland–Scotland Overflow Water (ISOW) and North-East Atlantic Deep Water. We also evaluate the water mass volume transports across the 2014 OVIDE line (Portugal to Greenland section) by combining the water mass fractions resulting from the eOMP analysis with the absolute geostrophic velocity field estimated through a box inverse model. This allowed us to assess the relative contribution of each water mass to the transport across the section. Finally, we discuss the changes in the distribution and transport of water masses between the 2014 OVIDE line and the 2002–2010 mean state. At the upper and intermediate water levels, colder end-members of the water masses replaced the warmer ones in 2014 with respect to 2002–2010, in agreement with the long-term cooling of the North Atlantic Subpolar Gyre that started in the mid-2000s. Below 2000 dbar, ISOW increased its contribution in 2014 with respect to 2002–2010, with the increase being consistent with other estimates of ISOW transports along 58–59° N. We also observed an increase in SPMW in the East Greenland Irminger Current in 2014 with respect to 2002–2010, which supports the recent deep convection events in the Irminger Sea. From the assessment of the relative water mass contribution to the Atlantic Meridional Overturning Circulation (AMOC) across the OVIDE line, we conclude that the larger AMOC intensity in 2014 compared to the 2002–2010 mean was related to both the increase in the northward transport of Central Waters in the AMOC upper limb and to the increase in the southward flow of Irminger Basin SPMW and ISOW in the AMOC lower limb.
    Subject code 551
    Language English
    Publishing date 2018-04-09
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article: Particulate silica and Si recycling in the surface waters of the Eastern Equatorial Pacific

    Adjou, Mohamed / Tréguer, Paul / Dumousseaud, Cynthia / Corvaisier, Rudolph / Brzezinski, Mark A / Nelson, David M

    Deep-Sea Research Part II. 2011 Feb., v. 58, no. 3-4

    2011  

    Abstract: The distributions of biogenic and lithogenic silica concentrations and net silica production rates in the upper 120m of the Eastern Equatorial Pacific (EEP) were examined in December 2004, on two transects situated at 110°W (4°N to 3°S) and along the ... ...

    Abstract The distributions of biogenic and lithogenic silica concentrations and net silica production rates in the upper 120m of the Eastern Equatorial Pacific (EEP) were examined in December 2004, on two transects situated at 110°W (4°N to 3°S) and along the equator (110°W to 140°W). Lithogenic silica (lSiO₂) was generally <10nmolSil⁻¹ with maximum concentrations reaching 25nmoll⁻¹ in surface waters. These low concentrations confirm low atmospheric inputs of particulate Si, consistent with reported low inputs of wind-borne material in the EEP. In spite of active upwelling of silicic acid-rich waters the biogenic silica (bSiO₂) concentrations were generally low, falling between 100 and 180nmolSil⁻¹ in the upper 50m and decreasing to less than 50nmolSil⁻¹ below ∼90m. Estimates of net bSiO₂ production rates revealed that the rate of production exceeded that of dissolution in the upper euphotic layer (0-40m) along 110°W with net production extending somewhat deeper (60-100m) to the west along the equator. Net production rates in the surface layer were low, ranging between 5 and 40nmolSil⁻¹d⁻¹, consistent with previous observations that diatoms are small contributors to autotrophic biomass in the EEP. Net silica dissolution predominated in the lower euphotic layer (40-120m), indicating active Si recycling which diminished the strength of the silica pump in this region.
    Keywords Bacillariophyceae ; biomass ; silica ; silicon ; surface water
    Language English
    Dates of publication 2011-02
    Size p. 449-461.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1500312-7
    ISSN 0967-0645
    ISSN 0967-0645
    DOI 10.1016/j.dsr2.2010.08.002
    Database NAL-Catalogue (AGRICOLA)

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