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Development of tree ring like proxy on arctic shrubs Cassiope tetragona to reconstruct polar climate
Entry ID: Cassiope_Arctic_Climate_Proxy_Weijers_IPY59_NL

Abstract: Annual stem length, annual number of leaves, annual average leaf length, annual total leaf length and leaf lifespan. All of Cassiope tetragona. These parameters were measured at three sites: Ny-Ålesund and Endalen in Svalbard and for Abisko, Sweden. Same parameters were measured in 17 control and 17 Open Top Chambers plots near Ny-Ålesund. Same parameters were measured in 20 control and 20 ... View entire text

Purpose: The study aims to validate the use of annual growth parameters of the arctic dwarf shrubs Cassiope tetragona as proxy for past arctic summer temperatures. Dendrochronological techniques are applied in order to establish reliable growth-temperature transfer functions that allow temperature reconstruction on the high arctic archipelago Svalbard.

Subsequently climate-growth relationships are further experimentally assessed by manipulating growth in the field through warming of the tundra with Open Top Chambers (OTC's), lowering of the Photosynthetically Active Radiation (PAR) with tents (-50%) and doubling the ambient precipitation in field sites near Longyearbyen and Ny-Ålesund in Svalbard.
Related URL
Description: Faculty home page
Geographic Coverage
Spatial coordinates   
  N: 78.9   S: 68.4   E: 18.8   W: 11.9
Min Altitude: 6 M Max Altitude: 500 M

Data Set Citation
Dataset Originator/Creator: Weijers, S.
Dataset Title: Annual growth parameters of Cassiope tetragona
Dataset Publisher: Weijers, S.
Temporal Coverage
Start Date: 2008-01-15
Stop Date: 2012-01-14
ISO Topic Category
Access Constraints Contact scientists for the data.
Use Constraints Contact scientists for the data.
Data Set Progress
Data Center
Netherlands National Polar Data Centre, Royal Netherlands Institute for Sea Research, Netherlands Organization for Scientific Research, Netherlands Supplemental Info
Data Center URL:

Data Center Personnel
Phone: +31 222 369 420
Fax: +31 222 319 674
Email: ira.van.den.broek at
Contact Address:
P.O. Box 59
City: Den Burg
Postal Code: 1790 AB
Country: The Netherlands

Data Center Personnel
Phone: +31-222-369 479
Fax: +31-222-319674
Email: bruin at
Contact Address:
P.O. Box 59
City: Den Burg
Postal Code: 1790 AB
Country: The Netherlands
Distribution Media: CD
Phone: +31 (0) 20 59 87047
Email: stef.weijers at
Contact Address:
Vrije Universiteit Amsterdam
Faculty of Earth and Life Sciences
Systems Ecology
De Boelelaan 1085
City: Amsterdam
Postal Code: 1081 HV
Country: The Netherlands
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Weijers, S., Broekman, R., and Rozema, J. (2010) Dendrochronology in the High Arctic: July air temperatures reconstructed from annual shoot length growth of the circumarctic dwarf shrub Cassiope tetragona. Quaternary Science Reviews 29, 3831-3842

Rozema J., Weijers S., Broekman R., Blokker P., Buizer B., Werleman C., El Yaqine H., Hoogedoorn H., Fuertes M.M., and Cooper E. (2009) Annual growth of Cassiope tetragona as a proxy for Arctic climate: developing correlative and experimental transfer functions to reconstruct past summer temperature on a millennial time scale Global Change Biology 15 1703–1715
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Creation and Review Dates
DIF Creation Date: 2012-01-03
Last DIF Revision Date: 2017-08-23