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Hot summers ahead? Multi-decadal spring season warming precedes sudden summer temperature rise in pre-anthropogenic climate change
Stockholm University, Faculty of Science, Department of Geological Sciences. Swedish Museum of Natural History, Sweden.
Number of Authors: 22019 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 141, no 3, p. 175-180Article in journal (Refereed) Published
Abstract [en]

Waning annual seasonality is documented in an up to one-month advance in spring onset since the 1980?s in northern latitudes, perturbing ecosystems and socio-economic performance. Summer temperatures, in contrast, have been rising only recently, indicating an offset in seasonal warming. The limited time span of this observational data makes the asynchronous pattern difficult to quantify, hindering projections of intra-annual dynamics. We explore temporal phase relations of seasonal warming over the Late Pleniglacial/B?lling and the Younger Dryas/Holocene climate transitions that preceded present anthropogenic warming. We determine past spring onset and thermal properties from dwarf birch paleo-phenology. Reconstructed spring warming led maximum summer warming by about a century during both transitions. Long-term reconstruction of intra-annual temperature regimes provides the perspective required for seasonal response analysis. Our results document that multi-decadal spring season warming precedes sudden summer temperature rise also during natural climate change. The rapidity of present seasonality changes, however, is unprecedented.

Place, publisher, year, edition, pages
2019. Vol. 141, no 3, p. 175-180
Keywords [en]
Climate change, seasonality, phenology, spring onset, birch, undulation index, arctic amplification, quaternary warming episodes, global warming
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-175829DOI: 10.1080/11035897.2019.1655791ISI: 000488679500001OAI: oai:DiVA.org:su-175829DiVA, id: diva2:1371494
Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2019-11-20Bibliographically approved

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