The increase in global climatic changes seen in recent years is
debated to be a result from expanding anthropogenic activity.
The aim for the study is to contribute to the climatic history at
western Spitsbergen mainly focusing on the last 2000 years and
recent climatic events.
Palaeoecoloogical studies investigates the climatic history of the
past, assessing the speed and direction of future climate
changes, and suggest how much of the changes are man made
or based on natural forces. Chironomids are a good indicator for
temperature changes in the past and were in this study used for
a temperature reconstruction in lake Tjørnskardet on western
The sediment cores were dated back to ~ 6000 years BP. From
the chironomid assembly, a temperature reconstruction was
established based on reduced modern training set. A total of 26
taxa were found, with Micopsectra, Hydorbaenus and Oliviridia
showing a considerable higher abundance compared to the rest
of the taxa in the assemblage. The inferred temperature based
on full modern training set and the reduced training set were
compared to the results from the neighbouring lake, Skardtjørna
together with the chironomid assemblage.
The reconstructed temperature gradient shows an overall
temperature decline from ~ 6000 years BP to present, in
correspondence to Skardtjørna and other sites at Svalbard.
Some major aberrant trends in the results indicate that there
might be a strong correlation between the temperature and
other environmental variables, which will influence the
chironomid composition and weaken the reconstructed
The comparisons of the temperature from the training sets
reveal that the inferred temperature based on the full training
set showed more resemblance between the lakes.||en