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Summer Moisture Variability in East Central Sweden Since the Mid-Eighteenth Century Recorded in Tree Rings

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To make predictions of future climate it is necessary to understand the past climate—temperature as well as precipitation. While a wealth of temperature proxies exist from northern latitudes, there is still a lack of information about past precipitation variability. Here we present a 300-year-long tree-ring width chronology from xeric-site Scots pines (Pinus sylvestris L.) in Tyresta National Park, east central Sweden. Tree-ring widths were compared to the long observed temperature and precipitation records from Stockholm during 1786–2000. Analyses of the climate/growth relationship showed that, in general, May–June precipitation had a dominating influence on pine growth. However, during dry periods, negative responses to June–July temperature were stronger, especially evident in the late nineteenth century. Periods of below-average growth were associated with dry conditions in May–June, but occasionally periods of wet and cool summers also produced narrow rings. Periods of above-average growth were linked to wet, but sporadically also cool and dry, early summers. The years between 1815 and 1833 appear to be particularly dry in the 300-year context. Since growth anomalies are found in other Swedish drought-sensitive tree-ring chronologies during this period, it is likely that this dry period had a regional extent. This is the first tree-ring chronology from southern Sweden that provides multi-century information of past summer drought and moisture variability with high resolution and the study will add important information regarding past climate variability in southern Sweden.
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Document Type: Research Article

Affiliations: 1: Earth Sciences Center, Göteborg University, Sweden 2: Southern Swedish Forest Research Center, Swedish University of Agricultural Sciences, Sweden 3: Department of Physical Geography and Quaternary Geology, Stockholm University, Sweden

Publication date: 2004-10-01

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