@article{ObrehtWoermerBraueretal.2020,
  author    = {Obreht, Igor and W{\"o}rmer, Lars and Brauer, Achim and Wendt, Jenny and Alfken, Susanne and De Vleeschouwer, David and Elvert, Marcus and Hinrichs, Kai-Uwe},
  title     = {An annually resolved record of Western European vegetation response to Younger Dryas cooling},
  series = {Quaternary science reviews : the international multidisciplinary research and review journal},
  volume    = {231},
  journal   = {Quaternary science reviews : the international multidisciplinary research and review journal},
  publisher = {Elsevier},
  address   = {Amsterdam [u.a.]},
  issn      = {0277-3791},
  doi       = {10.1016/j.quascirev.2020.106198},
  pages     = {15},
  year      = {2020},
  abstract  = {The regional patterns and timing of the Younger Dryas cooling in the North Atlantic realm were complex and are mechanistically incompletely understood. To enhance understanding of regional climate patterns, we present molecular biomarker records at subannual to annual resolution by mass spectrometry imaging (MSI) of sediments from the Lake Meerfelder Maar covering the Allerod-Younger Dryas transition. These analyses are supported by conventional extraction-based molecular-isotopic analyses, which both validate the imaging results and constrain the sources of the target compounds. The targeted fatty acid biomarkers serve as a gauge of the response of the local aquatic and terrestrial ecosystem to climate change. Based on the comparison of our data with existing data from Meerfelder Maar, we analyse the short-term environmental evolution in Western Europe during the studied time interval and confirm the previously reported delayed hydrological response to Greenland cooling. However, despite a detected delay of Western European environmental change of similar to 135 years, our biomarker data show statistically significant correlation with deuterium excess in Greenland ice core at - annual resolution during this time-transgressive cooling. This suggests a coherent atmospheric forcing across the North Atlantic realm during this transition. We propose that Western European cooling was postponed due to major reorganization of the westerlies that were intermittently forcing warmer and wetter air masses from lower latitudes to Western Europe and thus resulted in delayed cooling relative to Greenland.},
  language  = {en}
}
@article{EngelsBrauerBuddelmeijeretal.2016,
  author    = {Engels, Stefan and Brauer, Achim and Buddelmeijer, Nico and Martin-Puertas, Celia and Rach, Oliver and Sachse, Dirk and Van Geel, Bas},
  title     = {Subdecadal-scale vegetation responses to a previously unknown late-Allerod climate fluctuation and Younger Dryas cooling at Lake Meerfelder Maar (Germany)},
  series = {Journal of quaternary science},
  volume    = {31},
  journal   = {Journal of quaternary science},
  publisher = {Wiley-Blackwell},
  address   = {Hoboken},
  issn      = {0267-8179},
  doi       = {10.1002/jqs.2900},
  pages     = {741 -- 752},
  year      = {2016},
  abstract  = {Lake Meerfelder Maar (MFM) is the northernmost Western European sediment record with annual laminations across the Younger Dryas (YD), and the onset of the YD in the record of MFM has previously been defined as an increase in non-arboreal pollen abundance at ca. 12 680 varve a BP. Here we present a palynological record at unprecedented subdecadal resolution for MFM, covering the Allerod-YD transition. Our results show a fluctuation in pollen accumulation rates (PARs) before the onset of the YD, with lower rates between ca. 12 725 and 12 685 varve a BP. The fluctuation in PARs occurs simultaneous with a previously undescribed short fluctuation in sediment composition and varve thickness, as well as with changes in biogeochemical proxies. The combined evidence indicates signs of climatic instability ca. 45 years before the onset of the YD. The PAR records of Betula and Pinus furthermore show earlier and more abrupt changes at the onset of the YD than the percentage-records do. Finally, heliophilous herbaceous taxa show a delayed increase following the onset of the YD of ca. 145 years. This paper illustrates the potential to identify previously unrecognized climate variability and vegetation change when using subdecadal-resolution analyses. Copyright (C) 2016 John Wiley \& Sons, Ltd.},
  language  = {en}
}