Encyclopedia of Marine Geosciences

Living Edition
| Editors: Jan Harff, Martin Meschede, Sven Petersen, Jörn Thiede

Paleoceanographic Proxies

  • Gerold Wefer
Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-6644-0_82-1

Definition

Proxies stand in for direct measurements of past environmental conditions such as temperature, salinity, etc.

Introduction

Measured climate information such as temperature is only available back to the late nineteenth century. To extend the record further back in history, proxies have to be used. Proxies are physical and chemical parameters that can be transformed through a calibration process to real measured variables such as temperature. From the ratios of stable oxygen isotopes in the carbonate shells of marine organisms, e.g., past temperatures can be reconstructed if the isotopic composition of the seawater is known. The information is stored in sediments of the shelf areas, continental margins and abyssal plains, and in the skeletons of tropical or cold-water corals. Environmental information can be obtained from the quantity and composition of organic matter, carbonate, and opal shells and from the species compositions of plants and animals. An overview of the use of...

Keywords

Benthic Foraminifera Planktonic Foraminifera Accelerator Mass Spectrometry Boron Isotope Biological Pump 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  1. 1.MARUM – Center for Marine Environmental SciencesUniversity of BremenBremenGermany