The fast-acting “pulse” of Heinrich Stadial 3 in a mid-latitude boreal ecosystem

• Published in: Scientific Reports
• Main Authors: Badino, Federica, Pini, Roberta, Bertuletti, Paolo, Ravazzi, Cesare, Delmonte, Barbara, Monegato, Giovanni, Reimer, Paula, Vallé, Francesca, Arrighi, Simona, Bortolini, Eugenio, Figus, Carla, Lugli, Federico, Maggi, Valter, Marciani, Giulia, Margaritora, Davide, Oxilia, Gregorio, Romandini, Matteo, Silvestrini, Sara, Benazzi, Stefano
• Other Authors: ERC under the European Union's Horizon 2020 research and innovation programme
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2020
• Subjects: Multidisciplinary; North Atlantic
• Online Access: http://dx.doi.org/10.1038/s41598-020-74905-0; https://www.nature.com/articles/s41598-020-74905-0.pdf; https://www.nature.com/articles/s41598-020-74905-0

Abstract A 3800 year-long radiocarbon-dated and highly-resolved palaeoecological record from Lake Fimon (N-Italy) served to investigate the effects of potential teleconnections between North Atlantic and mid-to-low latitudes at the transition from Marine Isotope Stage (MIS) 3 to 2. Boreal ecosystems documented in the Fimon record reacted in a sensitive way to millennial and sub-millennial scale Northern Hemisphere atmospheric circulation patterns. The high median time-resolution of 58 years allows the identification of five abrupt event-boundaries (i.e., main forest expansion and decline excursions) synchronous with the sharp stadial/interstadial (GS/GI) transitions within dating uncertainties. During Heinrich Stadial 3 (HS 3) we reconstruct more open and dry conditions, compared to the other GS, with a dominant regional scale fire signal. Linkages between local fires and climate-driven fuel changes resulted in high-magnitude fire peaks close to GI/GS boundaries, even exacerbated by local peatland conditions. Finally, palaeoecological data from the HS 3 interval unveiled an internal variability suggesting a peak between 30,425 and 29,772 cal BP (2σ error) which matches more depleted δ 18 O values in alpine speleothems. We hypothesise that this signal, broadly resembling that of other mid-latitudes proxies, may be attributed to the southward shift of the Northern Hemisphere storm tracks and the associated delayed iceberg discharge events as documented during other HS.