AMBIO

, Volume 41, Issue 7, pp 699–708 | Cite as

A Multivariate Baltic Sea Environmental Index

  • Joachim W. Dippner
  • Georgs Kornilovs
  • Karin Junker
Report

Abstract

Since 2001/2002, the correlation between North Atlantic Oscillation index and biological variables in the North Sea and Baltic Sea fails, which might be addressed to a global climate regime shift. To understand inter-annual and inter-decadal variability in environmental variables, a new multivariate index for the Baltic Sea is developed and presented here. The multivariate Baltic Sea Environmental (BSE) index is defined as the 1st principal component score of four z-transformed time series: the Arctic Oscillation index, the salinity between 120 and 200 m in the Gotland Sea, the integrated river runoff of all rivers draining into the Baltic Sea, and the relative vorticity of geostrophic wind over the Baltic Sea area. A statistical downscaling technique has been applied to project different climate indices to the sea surface temperature in the Gotland, to the Landsort gauge, and the sea ice extent. The new BSE index shows a better performance than all other climate indices and is equivalent to the Chen index for physical properties. An application of the new index to zooplankton time series from the central Baltic Sea (Latvian EEZ) shows an excellent skill in potential predictability of environmental time series.

Keywords

Baltic Sea Climate indices Environmental prediction 

Notes

Acknowledgments

The authors are indebted to Tina Henrich for tremendous data processing. The time series of Landsort gauge has been provided by the Swedish Meteorological and Hydrological Institute (SMHI) Norrkoping, the time series of ice cover by the Finnish Institute for Marine Research (FIMR), the updated Chen index by Deliang Chen and Thorsten Blenckner, the updated river runoff by Miguel Rodriguez, and the updated Baltic Sea index by Andreas Lehmann. The COADS update in the NCEP Marine data have been provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/. All these contributions are greatly acknowledged. The zooplankton monitoring was performed and the data were prepared by the Institute of Food Safety, Animal Health and Environment, Riga, Latvia. This paper is a contribution to the BONUS+ ERANET Project AMBER (BMBF Project No. 03F0485A).

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Copyright information

© Royal Swedish Academy of Sciences 2012

Authors and Affiliations

  • Joachim W. Dippner
    • 1
  • Georgs Kornilovs
    • 2
  • Karin Junker
    • 1
  1. 1.Leibniz Institute for Baltic Sea Research WarnemündeRostockGermany
  2. 2.Fish Resources Research DepartmentInstitute of Food Safety, Animal Health and EnvironmentRigaLatvia

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