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Amersfoort, Netherlands

Jansma E.,Cultural Heritage Agency Rijksdienst voor het Cultureel Erfgoed | Jansma E.,University Utrecht | Jansma E.,Netherlands Center for Dendrochronology | Van Lanen R.J.,Netherlands Center for Dendrochronology | And 3 more authors.
Dendrochronologia | Year: 2012

Dendrochronological data formats in general offer limited space for recording associated metadata. Such information is often recorded separately from the actual time series, and often only on paper. TRiDaBASE has been developed to improve metadata administration. It is a relational Microsoft Access database that allows users to register digital metadata according to TRiDaS, to generate TRiDaS XML for uploading to TRiDaS-based analytical systems and repositories, and to ingest TRiDaS XML created elsewhere for local querying and analyses. © 2012 Istituto Italiano di Dendrocronologia. Source


Jansma E.,Netherlands Cultural Heritage Agency Rijksdienst voor het Cultureel Erfgoed | Jansma E.,University Utrecht | Jansma E.,Netherlands Center for Dendrochronology | van Lanen R.J.,Netherlands Center for Dendrochronology | And 2 more authors.
Dendrochronologia | Year: 2012

Existing on-line databases for dendrochronology are not flexible in terms of user permissions, tree-ring data formats, metadata administration and language. This is why we developed the . Digital Collaboratory for Cultural Dendrochronology (DCCD). This TRiDaS-based multi-lingual database allows users to control data access, to perform queries, to upload and download (meta)data in a variety of digital formats, and to edit metadata on line. The content of the DCCD conforms to EU best practices regarding the long-term preservation of digital research data. © 2012 Elsevier GmbH. Source


Nijland W.,University Utrecht | Jansma E.,University Utrecht | Jansma E.,Cultural Heritage Agency | Jansma E.,Netherlands Center for Dendrochronology | And 3 more authors.
Biogeosciences | Year: 2011

Plant growth in Mediterranean landscapes is limited by the typical summer-dry climate. Forests in these areas are only marginally productive and may be quite susceptible to modern climate change. To improve our understanding of forest sensitivity to annual and seasonal climatic variability, we use tree-ring measurements of two Mediterranean evergreen tree species: Quercus ilex L. and Arbutus unedo L. We sampled 34 stems of these species on three different types of substrates in the Peyne study area in southern France. The resulting chronologies were analysed in combination with 38 yr of monthly precipitation and temperature data to reconstruct the response of stem growth to climatic variability. Results indicate a strong positive response to May and June precipitation, as well as a significant positive influence of early-spring temperatures and a negative growth response to summer heat. Comparison of the data with more detailed productivity measurements in two contrasting years confirms these observations and shows a strong productivity limiting effect of low early-summer precipitation. The results show that tree-ring data from Q.ilex and A.unedo can provide valuable information about the response of these tree species to climate variability, improving our ability to predict the effects of climate change in Mediterranean ecosystems. © Author(s) 2011. Source

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