• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Department of Earth Science
  • Department of Earth Science
  • View Item
  •   Home
  • Faculty of Mathematics and Natural Sciences
  • Department of Earth Science
  • Department of Earth Science
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Temperature variability within the upper water masses of the western tropical Atlantic during rapid climate transitions

Oppedal, Lea Toska
Master thesis
Thumbnail
View/Open
78680093.pdf (33.38Mb)
URI
https://hdl.handle.net/1956/5235
Date
2010-01-20
Metadata
Show full item record
Collections
  • Department of Earth Science [868]
Abstract
Rapid reorganization of the ocean circulation in the Atlantic Ocean has been linked to widespread varations in climate on both millennial and glacial-interglacial timescales. The response of the tropical Atlantic upper ocean to such circulation changes, has been investigated in both proxy studies and modelling experiments. It is believed that reduction of the thermohaline overturning leads to decreased cross-equatorial northward transport of warm surface waters. Consequently, heat accumulates in the upper water column of the tropical Atlantic. In this thesis, temperature variability within the upper water masses of the western tropical Atlantic is investigated in six timeslices associated with different modes of overturning circulation. The timeslices represent the Last Glacial Maximum, Heinrich event 1, Bølling-Allerød, the Younger Dryas and the early and late Holocene. Changes in the thermal stratification of the upper water column are inferred from stable oxygen isotope- and Mg/Ca measurements on five species of planktonic foraminfera that live vertically dispersed in the upper water masses. The proxy measurements provide evidence that more heat was stored in western tropical Atlantic waters during the Last Glacial Maximum when the thermohaline overturning was reduced. Heat was released in the present interglacial, which is associated with vigorous overturning. Concomitant to reductions in the overturning circulation, centred on the deglaciation, possible evidence is given that heat accumulated in the upper tropical water masses. However, on this scale, the results are not conclusive, and further investigation is needed.
Publisher
The University of Bergen
Copyright
Copyright the author. All rights reserved

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit