Index Geophysics

Spectral Analysis of the Svalbard Temperature Record 1912–2010

Climate development with possible anthropogenic effects occurs on a background of natural climatic variations, which may be considerable, and especially in the Arctic. Natural climate variations however remain poorly understood, although they remain important for discriminating between natural and anthropogenic influences on current climate change. Using the Svalbard (78°N) surface air temperature record 1912–2010 as an example, we here suggest a road ahead to identify and describe such natural climate variations. By means of Fourier and wavelet analysis the record is decomposed into time-frequency space, to extract information on periodic signals and their amplitude and variation over time. By this we identify several cyclic variations on the time scale investigated. These oscillations are present in the annual record, as well as in seasonal subsets of the record. Using only three oscillations it is possible to hindcast the Svalbard temperature record well. We suggest that such persistent oscillations may be used for forecasting the overall features of future temperature changes for a limited period, about 10–25% of the record length. Our main focus is on identifying the character of recurrent natural temperature variations, but we also comment briefly on possible physical explanations for some of the identified cyclic variations.

Ole Humlum

Jan-Erik Solheim

Kjell Stordahl

Meteorology. Climatology

QC851-999

Hindawi Limited

2011-01-01T00:00:00Z

article

1687-9309

1687-9317

10.1155/2011/175296

https://doaj.org/article/ddc9560434504fae904f45b4792c0432

Advances in Meteorology, Vol 2011 (2011)

EN

http://dx.doi.org/10.1155/2011/175296

https://doaj.org/toc/1687-9309

https://doaj.org/toc/1687-9317

Journal Licence: CC BY