Preprints
https://doi.org/10.5194/cp-2021-133
https://doi.org/10.5194/cp-2021-133

  20 Oct 2021

20 Oct 2021

Review status: this preprint is currently under review for the journal CP.

Spring onset and seasonality patterns during the Lateglacial in the eastern Baltic region

Leeli Amon1, Friederike Wagner-Cremer2, Jüri Vassiljev1, and Siim Veski1 Leeli Amon et al.
  • 1Department of Geology, Tallinn University of Technology, Tallinn, 19086, Estonia
  • 2Department of Geosciences and Physical Geography, Utrecht University, Utrecht, 3584, The Netherlands

Abstract. Spring onset is an important phenological observation that is sensitive to modern climate change and can be traced back in geological time. The Lateglacial (~14500–11700 cal yr BP) spring onset and growing season (growth-degree-days) dynamics in the eastern Baltic region were reconstructed using the micro-phenological approach based on the dwarf birch (Betula nana) subfossil leaf cuticles. The presented study sites, Lake Lielais Svetinu (eastern Latvia) and Lake Kosilase (central Estonia), are located ~200 km apart in the region affected by the south-eastern sector of the Scandinavian Ice Sheet. During the Lateglacial period the region and its biota were influenced by the retreating glacier and the different stages of the Baltic Ice Lake. The plant macrofossil data confirms that the study sites were located in different vegetation zones (arctic-to-boreal) during the Lateglacial period. The dynamics of the estimated length of the growing season and spring onset, combined with the regional collection of plant macrofossil records, suggest the importance of local settings to species migration. During the Lateglacial warming period (Bølling/Allerød), a notable spring warming and longer growing season was calculated based on micro-phenology, but the treeline did not extend beyond central Estonia. The comparison of pollen- and chironomid-inferred past temperature estimations with spring onset, growth-degree-days, and plant macrofossil data shows coherent patterns during the cooler Older Dryas and warmer Bølling/ Allerød periods while suggesting more complicated climate dynamics and possible warmer episodes during the Younger Dryas cold reversal.

Leeli Amon et al.

Status: open (until 25 Dec 2021)

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Leeli Amon et al.

Leeli Amon et al.

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Short summary
The spring onset and growing season dynamics during the Lateglacial in the Baltic region were reconstructed using the micro-phenology based on the dwarf birch subfossil leaf cuticles. The comparison of pollen- and chironomid-inferred past temperature estimations with spring onset, growth-degree-days, and plant macrofossil data shows coherent patterns during the cooler Older Dryas and warmer Bølling/ Allerød periods but more complicated climate dynamics during the Younger Dryas cold reversal.