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 Marine Climate Research
Last Update
05.07.2013
 

Research Group Paleoceanography and -climate

Dr. Guillaume Leduc


Institute of Geosciences,
Dep. Geology Kiel University

Ludewig-Meyn-Str. 10
D-24118 Kiel, Germany

Tel.: +49 (0)431 880 2372
Fax.: +49 (0)431 880 1912
E-mail: gl[@]gpi.uni-kiel.de

Raum 16


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Research interests

  • Temporal variations in geomagnetic field intensity
  • Past changes in cosmogenic nuclides production rate in the atmosphere
  • Modes of rapid climatic variability at low latitudes
  • Past changes in El Niño/Southern Oscillation and monsoon dynamics in the equatorial Pacific
  • Intermediate-depth Pacific water masses movements
  • Holocene and Eemian sea surface temperatures trends
Evaluation of Eemian and Holocene Climate Variability: Synthesis of marine archives with climate modelling

The major objective of the project is to investigate the spatio-temporal pattern of temperature changes during the Eemian and Holocene as derived from integrations with a comprehensive global climate model, marine surface ocean temperature and oxygen isotope records as well as from terrestrial archives on a global scale. We will explore the worldwide distribution of existing, reedited, and newly collected marine and terrestrial palaeotemperature data and compare it with results from transient experiments with a state-of-the-art general circulation model used in the assessment of future climate change. The palaeodata collection and the modelling efforts will aim to investigate the regionally very different temporal climate patterns during the middle to late Holocene (the last 6,000 years) and the Eemian (125,000 years before present). Special emphasis is placed on the last 3000 years, striving to complement a former low-resolution study of the Holocene. With advanced statistical analysis of spatial and temporal variability in the palaeodata records and in the model results, natural climate variability modes and their amplitude will be identified in the data and compared with the climate variability tracked down in the model experiments. Pattern analysis will unravel heterogeneity in temperature trends. The extension of the Latest Holocene climate simulations into the next centuries, using scenarios for future greenhouse gas emission, can help to assess future climatic change influenced by natural and anthropogenic “forcing”. The statistical analyses will extract climate phenomena from different proxy time-series and elaborate common variability and teleconnections for the last two interglacial periods. The aim is to unravel the influence of natural forcing factors, like e.g. parameters of the Earth's orbit, on climate variability and regional heterogeneity in climate trends. The variations in the large-scale ocean circulation and feedback mechanisms between thermohaline circulation changes and low-frequency variations of climate will be investigated.

 

Title (original): Variations temporelles des changements hydrologiques dans le zone du Pacifique Est. Approches géochimiques, isotopiques et micropaléontologiques (whole document in french).
 
Title (in English): Temporal variations of hydrological changes in the eastern Pacific. Geochemical, isotopic and micropaleontological approaches (english resume).

 

 

  • Rincón-Martínez D., Lamy F., Contreras S., Leduc G., Bard E., Saukel C., Blanz T., Mackensen A., Tiedemann R. Wetter interglacials in Ecuador during the past 500 kyr and its relation to latitudinal shifts of the Equatorial Front in the eastern tropical Pacific. Paleoceanography, in press.
  • Leduc G., Schneider R., Kim J.-H., Lohmann G., Holocene and Eemian sea surfacer temperature trends as revealed by alkenone and Mg/Ca paleothermometry. Quaternary Science Reviews, in press.
  • Leduc G., Vidal L., Cartapanis O, Bard E., Modes of Eastern Equatorial Pacific thermocline variability: implications for ENSO dynamics over the last glacial period. Paleoceanography, 24, PA3202, doi:10.1029/2008PA001701, 2009.