GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Type of Medium: Book
    Pages: S. 87 - 218 , Ill., graph. Darst.
    Series Statement: Marine Pollution Bulletin 59.2009,4/7
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Type of Medium: Book
    Pages: 133 S , graph. Darst.
    Series Statement: Progress in oceanography 89.2011,1/4, Special issue
    Language: English
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2022-06-28
    Description: Las señales climáticas preservadas en las bandas de crecimiento del esqueleto de corales masivos ofrecen una perspectiva a largo plazo que permite comprender los cambios de la temperatura superficial del mar a diferentes escalas de tiempo. En el área del mar Caribe y el Golfo de México, especies de corales como Orbicella faveolata, en aguas someras, presentan formas de crecimiento masivo que facilitan el fechado de su esqueleto, lo que ha permitido la realización de estudios paleoambientales en zonas costeras donde los registros instrumentales son escasos y abarcan cortos periodos de tiempo. El propósito de este estudio fue caracterizar los registros geoquímicos en el esqueleto de un coral herma- típico O. faveolata, recolectado en el arrecife de Cayo Santa María, Cuba, y reconstruir la temperatura superficial del mar (TSM), con resolución anual, para los dos últimos siglos. Se obtuvieron registros de 230 años de Li/Ca, Sr/Ca, Mg/Ca, U/Ca, Li/Mg y Sr-U. De los indicadores geoquímicos analizados, el Li/Ca permitió la reconstrucción de la TSM para el área de estudio e indicó un incremento de 0.77 °C en los últimos 50 años. Ade- más, Li/Ca corroboró con buena exactitud los periodos característicos de calentamiento y enfriamiento reportados para el mar Caribe y el Golfo de México desde 1778. Orbicella faveolata demostró contener un buen registro multidecadal de la temperatura anual y de la Variabilidad Multidecadal Atlántica. Los resultados son la primera reconstrucción a largo plazo de la TSM en la zona costera de Cuba y brindan información relevante para comprender el calentamiento global en la región.
    Description: Climatic signals preserved in the skeletal growth bands of massive corals offer a long-term perspective that allows understanding sea surface temperature changes at different time scales. In the Caribbean Sea and the Gulf of Mexico, coral species such as Orbicella faveolata present massive growth forms in shallow waters that facilitate dating of their skeleton, allowing to perform paleoenvironmental studies in coastal areas where instrumental records are scarce and cover short time periods. This study aimed to characterize coral geochem- ical records in the skeleton of a hermatypic coral O. faveolata collected in the Cayo Santa María (Cuba) reef and to reconstruct seawater surface annual temperatures for the last two centuries. Records of 230 years for Li/Ca, Sr/Ca, Mg/Ca, U/ Ca, Li/Mg, and Sr-U were obtained. The Li/Ca indicator al- lowed the reconstruction of SST in the study area from 1778 to 2015, indicating an overall increase of 0.77 °C in the last 50 years. In addition, Li/Ca corroborated with high accuracy the characteristic warming and cooling periods reported for the Caribbean Sea and the Gulf of Mexico since 1778. Orbicella faveolata proved to contain a good multidecadal record of annual temperature and of the Atlantic Multidecadal Variability. These results are the first long-term reconstruction of SST in the Cuban coastal zone and provide relevant information to understand global warming in the Caribbean.
    Description: Published
    Description: Refereed
    Keywords: Orbicella faveolata ; Temperatura superficial del mar ; Li/Ca ; Reconstrucción paleoclimática ; Seawater temperature ; Li/ Ca proxy ; Climate archives ; Paleoclimate reconstruction
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.37-53
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2020-07-09
    Description: Marine laminated sediments in dysoxic areas of the ocean floor are an excellent archive for high-resolution climate reconstructions. While the existence of discontinuities produced by natural events, such as underwater landslides (slumps), strong bottom currents, and/or bioturbation is usually acknowledged for long records, the extent of their influence on high-resolution sequences is usually not considered. In the present work we show strong evidence for multiple stratigraphic discontinuities in different gravity and box-cores retrieved off Pisco (Peru) covering the last 600 years. Chronostratigraphies are largely based on cross-correlation of distinct sedimentary structures (determined by X-ray image analysis) and validated using 210Pb, 241Am, and 14C profiles, as well as proxy records. The cross-correlation of distinct stratigraphic layers allows for chronostratigraphic tie points and clearly shows that some sedimentary sequences are continuous across scales of tens of kilometers, indicating that regional processes often determine laminae formation. Some differences in laminae thickness were found among cores, which could be explained by different sedimentation rates, spatially variable deposition of diatom blooms, changes in silica dissolution and partial deposition/erosion caused by bottom currents. Using multiple stratigraphic tie points provides clear evidence for laminated sequences present in some cores to be missing in other cores. Moreover, instantaneous depositions from upslope were identified in all the cores disrupting the continuity of the sediment records. These discontinuities (instantaneous deposits and missing sequences) may be due to slumps, possibly triggered by earthquakes and/or erosion by strong bottom currents. In spite of the missing sequences in some cores, a continuous composite record of the last six centuries was reconstructed from spliced sequences of the different cores, which provides a well-constrained temporal framework to develop further high-resolution proxies in this region. The present work shows that paleoreconstructions developed from single cores, particularly in areas with strong seismic activity and/or strong bottom currents, are subject to both temporal gaps and instantaneous depositions from upslope, both of which could be misinterpreted as abrupt climate changes or anomalous climate events. We stress the need for multiple cores to determine the stratigraphic continuity and chronologies for high-resolution records.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...