A reconstructed Siberian High index since A.D. 1599 from Eurasian and North American tree rings

Details A reconstructed Siberian High index since A.D. 1599 from Eurasian and North American tree rings A reconstructed Siberian High index since A.D. 1599 from Eurasian and North American tree rings

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3205705d&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 5, CiteID L05705

Physics

5

Global Change: Climate Dynamics (0429, 3309), Global Change: Impacts Of Global Change (1225), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Atmospheric Processes: Paleoclimatology (0473, 4900), Paleoceanography: Dendrochronology

Scientific paper

The long-term variability of the Siberian High, the dominant Northern Hemisphere anticyclone during winter, is largely unknown. To investigate how this feature varied prior to the instrumental record, we present a reconstruction of a Dec-Feb Siberian High (SH) index based on Eurasian and North American tree rings. Spanning 1599-1980, it provides information on SH variability over the past four centuries. A decline in the instrumental SH index since the late 1970s, related to Eurasian warming, is the most striking feature over the past four hundred years. It is associated with a highly significant (p < 0.0001) step change in 1989. Significant ~3-4 yr spectral peaks in the reconstruction fall within the range of variability of the East Asian winter monsoon (which has also declined recently) and lend further support to proposed relationships between these large-scale features of the climate system.

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