A global compilation of diatom silica oxygen isotope records from lake sediment – trends, and implications for climate reconstruction

• DOI: 10.5194/cp-2022-96
• Publication Date: 2023-01-24T07:34:10Z
• Authors: Philip Meister; Anne Alexandre; Hannah Bailey; Philip Barker; Boris K. Biskaborn; Ellie Broadman; Rosine Cartier; Bernhard Chapligin; Martine Couapel; Jonathan R. Dean; Bernhard Diekmann; Poppy Harding; Andrew C. G. Hend...; Armand Hernandez; Ulrike Herzschuh; Svetlana S. Kostrova; Jack Lacey; Melanie J. Leng; Andreas Lücke; Anson W. Mackay; Eniko Katalin Mag...; Biljana Narancic; Cécile Porchier; Gunhild Rosqvist; Aldo Shemesh; Corinne Sonzogni; George E. A. Swann; Florence Sylvestre; Hanno Meyer
• Keywords: Paleoclimatology; Last Glacial Maximum; Proxy (statistics)

Abstract. Oxygen isotopes in biogenic silica (δ18OBSi) from lake sediments allow for quantitative reconstruction of past hydroclimate and proxy–model comparison terrestrial environments. The signals individual records have been attributed to different factors, such as air temperature (Tair), atmospheric circulation patterns, hydrological changes evaporation. While every will its own set drivers d18O, here we explore the extent which regional or even global emerge a series palaeoenvironmental records. For this purpose, identified compiled 71 down–core published date complemented these datasets with additional basin parameters (e.g. water residence time catchment size) best characterize signal properties. Records feature widely temporal coverage resolution ranging decadal–scale covering last 150 years multi–millennial scale spanning glacial–interglacial cycles. Best number (N = 37) datapoints 2112) is available northern hemispheric (NH) extra–tropic regions throughout Holocene (corresponding Marine Isotope Stage 1; MIS 1). To address variabilities offsets, were brought common by binning subsequently filtered hydrologically open lakes times < 100 yrs. mid– high–latitude (> 45° N) lakes, find δ18OBSi patterns during both Common Era maxima minima corresponding known climate episodes Thermal Maximum (HTM), Neoglacial Cooling, Medieval Climate Anomaly (MCA) Little Ice Age (LIA). These are line long–term Tair supported previously reconstructions other archives well summer insolation changes. In conclusion, oxygen isotope NH extratopic at centennial (for CE) millennial Holocene) scales despite stemming geographic locations constitute valuable proxy reconstructions.