TY  - JOUR
A1  - Warken, Sophie Friederike
A1  - Fohlmeister, Jens Bernd
A1  - Schröder-Ritzrauh, Andrea
A1  - Constantin, Silviu
A1  - Spötl, Christoph
A1  - Gerdes, Axel
A1  - Esper, Jan
A1  - Frank, Norbert
A1  - Arps, Jennifer
A1  - Terente, Mihai
A1  - Riechelmann, Dana Felicitas Christine
A1  - Mangini, Augusto
A1  - Scholz, Denis
T1  - Reconstruction of late Holocene autumn/winter precipitation variability in SW Romania from a high-resolution speleothem trace element record
JF  - Earth & planetary science letters
N2  - We present the first high-resolution trace element (Mg/Ca, Sr/Ca, Ba/Ca) record from a stalagmite in southwestern Romania covering the last 3.6 ka, which provides the potential for quantitative climate reconstruction. Precise age control is based on three independent dating methods, in particular for the last 250 yr, where chemical lamina counting is combined with the identification of the 20th century radiocarbon bomb peak and Th-230/U dating. Long-term cave monitoring and model simulations of drip water and speleothem elemental variability indicate that precipitation-related processes are the main drivers of speleothem Mg/Ca ratios. Calibration against instrumental climate data shows a significant anti-correlation of speleothem Mg/Ca ratios with autumn/winter (October to March) precipitation (r = -0.61, p < 0.01), which is statistically robust when considering age uncertainties and auto-correlation. This relationship is used to develop a quantitative reconstruction of autumn/winter precipitation. During the late Holocene, our data suggest a heterogeneous pattern of past regional winter hydroclimate in the Carpathian/Balkan realm, along with intermittent weakening of the dominant influence of North Atlantic forcing. In agreement with other regional paleo-hydrological reconstructions, the observed variability reveals periodically occurring strong NW-SE hydro-climate gradients. We hypothesize, that this pattern is caused by shifts of the eastern edge of the area of influence of the NAO across central eastern Europe due to the confluence of North Atlantic forcing, and other climatic features such as the East Atlantic/Western Russia (EAWR) pattern. (C) 2018 Elsevier B.V. All rights reserved.
KW  - speleothem
KW  - trace elements
KW  - proxy calibration
KW  - precipitation reconstruction
KW  - Romania
KW  - North Atlantic forcing
Y1  - 2018
U6  - https://doi.org/10.1016/j.epsl.2018.07.027
SN  - 0012-821X
SN  - 1385-013X
VL  - 499
SP  - 122
EP  - 133
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Weber, Michael
A1  - Scholz, Denis
A1  - Schröder-Ritzrau, Andrea
A1  - Deininger, Michael
A1  - Spötl, Christoph
A1  - Lugli, Federico
A1  - Mertz-Kraus, Regina
A1  - Jochum, Klaus Peter
A1  - Fohlmeister, Jens Bernd
A1  - Stumpf, Cintia F.
A1  - Riechelmann, Dana F. C.
T1  - Evidence of warm and humid interstadials in central Europe during early MISSUE 3 revealed by a multi-proxy speleothem record
JF  - Quaternary science reviews : the international multidisciplinary research and review journal
N2  - Marine Isotope Stage 3 (MIS 3, 57-27 ka) was characterised by numerous rapid climate oscillations (i.e., Dansgaard-Oeschger (D/O-) events), which are reflected in various climate archives. So far, MIS 3 speleothem records from central Europe have mainly been restricted to caves located beneath temperate Alpine glaciers or close to the Atlantic Ocean. Thus, MIS 3 seemed to be too cold and dry to enable speleothem growth north of the Alps in central Europe. Here we present a new speleothem record from Bunker Cave, Germany, which shows two distinct growth phases from 52.0 (+0.8, -0.5) to 50.9 (+0.6, -1.3) ka and 473 (+1.0, -0.6) to 42.8 (+/- 0.9) ka, rejecting this hypothesis. These two growth phases potentially correspond to the two warmest and most humid phases in central Europe during MIS 3, which is confirmed by pollen data from the nearby Eifel. The hiatus separating the two phases is associated with Heinrich stadial 5 (HS 5), although the growth stop precedes the onset of HS 5. The first growth phase is characterised by a fast growth rate, and Mg concentrations and Sr isotope data suggest high infiltration and the presence of soil cover above the cave. The second growth phase was characterised by drier, but still favourable conditions for speleothem growth. During this phase, the delta C-13 values show a significant decrease associated with D/O-event 12. The timing of this shift is in agreement with other MIS 3 speleothem data from Europe and Greenland ice core data. (C) 2018 Elsevier Ltd. All rights reserved.
KW  - Speleothems
KW  - Pleistocene
KW  - Palaeoclimatology
KW  - Europe
KW  - Dansgaard-Oeschger event
KW  - Marine isotope stage 3
KW  - Bunker cave
KW  - Multi-proxy approach
KW  - U-Th series
Y1  - 2018
U6  - https://doi.org/10.1016/j.quascirev.2018.09.045
SN  - 0277-3791
VL  - 200
SP  - 276
EP  - 286
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Riechelman, Dana F. C.
A1  - Fohlmeister, Jens Bernd
A1  - Kluge, Tobias
A1  - Jochum, Klaus Peter
A1  - Richter, Detlev K.
A1  - Deininger, Michael
A1  - Friedrich, Ronny
A1  - Frank, Norbert
A1  - Scholz, Denis
T1  - Evaluating the potential of tree-ring methodology for cross-dating of three annually laminated stalagmites from Zoolithencave (SE Germany)
JF  - Quaternary geochronology : the international research and review journal on advances in quaternary dating techniques
N2  - Three small stalagmites from Zoolithencave (southern Germany) show visible laminae, which consist of a clear and a brownish, pigmented layer pair. This potentially provides the opportunity to construct precise chronologies by counting annual laminae. The growth period of the three stalagmites was constrained by the C-14 bomb peak in the youngest part of all three stalagmites and C-14-dating of a piece of charcoal in the consolidated base part of stalagmite Zoo-rez-2. These data suggest an age of AD 1970 for the top laminae and a lower age limit of AD 1973-1682 or AD 1735-1778. Laminae were counted and their thickness determined on scanned thin sections of all stalagmites. On stalagmites Zoo-rez-1 and -2, three tracks were measured near the growth axes, each separated into three sections at prominent anchor laminae (I, II, III). Each section was replicated three times (a, b, c). For Zoo-rez-3, only one track was measured. The total number of laminae counted for Zoo-rez-1 ranges from 138 to 177, for Zoo-rez-2 from 119 to 145, and for Zoo-rez-3 from 159 to 166. The numbers agree well with the range constrained by the bomb peak and the age of the charcoal, which supports the annual origin of the laminae. The replicated measurements of the different tracks as well as the three different tracks on the stalagmites Zoo-rez-1 and-2 were cross-dated using the TSAP-Win (R) tree-ring software. This software is very useful for cross-dating because it enables to insert or delete missing or false laminae as well as identifying common pattern by shifting the series back and forth in time. However, visual inspection of the thin sections was necessary to confirm detection of missing or false laminae by TSAP-Win (R). For all three Zoo-rez speleothems, crossdating of the mean lamina thickness series was not possible due to a missing common pattern. The cross-dating procedure results in three refined chronologies for the three Zoo-rez stalagmites of ranging from AD 1821-1970 (Zoo-rez-1), AD 1835-1970 (Zoo-rez-2), and AD 1808-1970 (Zoo-rez-3).
KW  - Speleothems
KW  - Annual laminae
KW  - Lamina thickness
KW  - C-14 bomb peak
KW  - Tree-ring software
KW  - Cross-dating
Y1  - 2019
U6  - https://doi.org/10.1016/j.quageo.2019.04.001
SN  - 1871-1014
SN  - 1878-0350
VL  - 52
SP  - 37
EP  - 50
PB  - Elsevier
CY  - Oxford
ER  - 
TY  - JOUR
A1  - Comas-Bru, Laia
A1  - Harrison, Sandy P.
A1  - Werner, Martin
A1  - Rehfeld, Kira
A1  - Scroxton, Nick
A1  - Veiga-Pires, Cristina
A1  - Ahmad, Syed Masood
A1  - Brahim, Yassine Ait
A1  - Mozhdehi, Sahar Amirnezhad
A1  - Arienzo, Monica
A1  - Atsawawaranunt, Kamolphat
A1  - Baker, Andy
A1  - Braun, Kerstin
A1  - Breitenbach, Sebastian Franz Martin
A1  - Burstyn, Yuval
A1  - Chawchai, Sakonvan
A1  - Columbu, Andrea
A1  - Deininger, Michael
A1  - Demeny, Attila
A1  - Dixon, Bronwyn
A1  - Hatvani, Istvan Gabor
A1  - Hu, Jun
A1  - Kaushal, Nikita
A1  - Kern, Zoltan
A1  - Labuhn, Inga
A1  - Lachniet, Matthew S.
A1  - Lechleitner, Franziska A.
A1  - Lorrey, Andrew
A1  - Markowska, Monika
A1  - Nehme, Carole
A1  - Novello, Valdir F.
A1  - Oster, Jessica
A1  - Perez-Mejias, Carlos
A1  - Pickering, Robyn
A1  - Sekhon, Natasha
A1  - Wang, Xianfeng
A1  - Warken, Sophie
A1  - Atkinson, Tim
A1  - Ayalon, Avner
A1  - Baldini, James
A1  - Bar-Matthews, Miryam
A1  - Bernal, Juan Pablo
A1  - Boch, Ronny
A1  - Borsato, Andrea
A1  - Boyd, Meighan
A1  - Brierley, Chris
A1  - Cai, Yanjun
A1  - Carolin, Stacy
A1  - Cheng, Hai
A1  - Constantin, Silviu
A1  - Couchoud, Isabelle
A1  - Cruz, Francisco
A1  - Denniston, Rhawn
A1  - Dragusin, Virgil
A1  - Duan, Wuhui
A1  - Ersek, Vasile
A1  - Finne, Martin
A1  - Fleitmann, Dominik
A1  - Fohlmeister, Jens Bernd
A1  - Frappier, Amy
A1  - Genty, Dominique
A1  - Holzkamper, Steffen
A1  - Hopley, Philip
A1  - Johnston, Vanessa
A1  - Kathayat, Gayatri
A1  - Keenan-Jones, Duncan
A1  - Koltai, Gabriella
A1  - Li, Ting-Yong
A1  - Lone, Mahjoor Ahmad
A1  - Luetscher, Marc
A1  - Mattey, Dave
A1  - Moreno, Ana
A1  - Moseley, Gina
A1  - Psomiadis, David
A1  - Ruan, Jiaoyang
A1  - Scholz, Denis
A1  - Sha, Lijuan
A1  - Smith, Andrew Christopher
A1  - Strikis, Nicolas
A1  - Treble, Pauline
A1  - Unal-Imer, Ezgi
A1  - Vaks, Anton
A1  - Vansteenberge, Stef
A1  - Voarintsoa, Ny Riavo G.
A1  - Wong, Corinne
A1  - Wortham, Barbara
A1  - Wurtzel, Jennifer
A1  - Zhang, Haiwei
T1  - Evaluating model outputs using integrated global speleothem records of climate change since the last glacial
JF  - Climate of the past : an interactive open access journal of the European Geosciences Union
N2  - Although quantitative isotope data from speleothems has been used to evaluate isotope-enabled model simulations, currently no consensus exists regarding the most appropriate methodology through which to achieve this. A number of modelling groups will be running isotope-enabled palaeoclimate simulations in the framework of the Coupled Model Intercomparison Project Phase 6, so it is timely to evaluate different approaches to using the speleothem data for data–model comparisons. Here, we illustrate this using 456 globally distributed speleothem δ18O records from an updated version of the Speleothem Isotopes Synthesis and Analysis (SISAL) database and palaeoclimate simulations generated using the ECHAM5-wiso isotope-enabled atmospheric circulation model. We show that the SISAL records reproduce the first-order spatial patterns of isotopic variability in the modern day, strongly supporting the application of this dataset for evaluating model-derived isotope variability into the past. However, the discontinuous nature of many speleothem records complicates the process of procuring large numbers of records if data–model comparisons are made using the traditional approach of comparing anomalies between a control period and a given palaeoclimate experiment. To circumvent this issue, we illustrate techniques through which the absolute isotope values during any time period could be used for model evaluation. Specifically, we show that speleothem isotope records allow an assessment of a model's ability to simulate spatial isotopic trends. Our analyses provide a protocol for using speleothem isotope data for model evaluation, including screening the observations to take into account the impact of speleothem mineralogy on δ18O values, the optimum period for the modern observational baseline and the selection of an appropriate time window for creating means of the isotope data for palaeo-time-slices.
Y1  - 2019
U6  - https://doi.org/10.5194/cp-15-1557-2019
SN  - 1814-9324
SN  - 1814-9332
VL  - 15
IS  - 4
SP  - 1557
EP  - 1579
PB  - Copernicus
CY  - Göttingen
ER  -