New paper presenting paleoclimate reconstruction over the last centuries in North East Patagonia has been published in Quaternary Science Reviews. In this publication, we investigate the clastic varves of Lake Jeinimeni with sedimentological and geochemical methods to retrieve information about past climate variability. The investigations were coordinated by Prof. Nathalie Fagel from the University of Liege. Happy reading!
Fagel N., Pedreros P., Alvarez D., Tylmann W., Namur O., Da Silva A.C., Jana P., Araneda A., Billy I., Schmidt S., Urrutia R., 2021. Last millennium climate variability of the varved Lake Jeinimeni geochemical record from NE Chilean Patagonia. Quaternary Science Reviews, 269: 107134. DOI 10.1016/j.quascirev.2021.107134. LINK
On June 7th Paleolimnology Session was held at the Institute of Biology and Earth Sciences, Pomeranian Academy in Słupsk. This year, the main topic focused on lacustrine sediment records and peat archives in the coastal zone of northern Poland. Our lab presented two oral presentation and two posters about ongoing research in northern Poland. The poster presented by Agnieszka Szczerba about meteorological conditions and chrysophyte cysts was recognized as the best poster during the session!
Małgorzata Kinder, Sabine Wulf
Late Holocene ultradystal cryptotephra in varved sediments of Lake Żabińskie
Maurycy Żarczyński, Paul Zander, Alicja Bonk, Paulina Głowacka, Agnieszka Szczerba, Martin Grosjean, Wojciech Tylmann
Combining neo- and paleolimnology: last decade recorded in varves of Lake Żabińskie
Anna Poraj-Górska, Alicja Bonk, Maurycy Żarczyński, Małgorzata Kinder, Wojciech Tylmann
Varved sediments as indicators of the anthropocene: a record of cultural eutrophication and seasonal hypoxia
Agnieszka Szczerba, Sergi Pla Rabés, Maurycy Żarczyński, Paulina Głowacka, Wojciech Tylmann
Meteorological conditions of seasonal variability in chrysophyte cysts in lakes of northeastern Poland
The latest issue of Past Global Changes Magazine celebrates the 30th anniversary of the PAGES project. Since its formation in 1991, PAGES has been at the forefront of paleoscience research. Alicja Bonk together with her colleagues from PAGES ECN, Stella Alexandroff, Madelyn Mette, and Tamara Trofimova, were Guest Editors of the section illustrating advances in past global change research by early-career researchers active in the PAGES community.
Link to PAGES Magazine is here.
We are pleased to announce that the interview with Ala Bonk was published in the first issue of Past Global Changes Horizons. Along with other members of PAGES Early-Career Network, Stella Alexandroff and Tamara Trofimova, Ala shares her opinion about why it is important to study past environmental changes, why she decided to become paleoscientist, and what is the potential importance of her research for our future.
The full interview can be found LINK.
We are happy to announce that we have just received the NCN OPUS grant “Eutrophication, mixing regime changes and anoxia: tracking the responses of varved Lake Gorzyńskie (NW Poland) to climate variability and human impact during the Holocene”. With this project we aim to (1) reconstruct lake productivity and local vegetation changes since the beginning of the Holocene (ca. 11,500 years ago) to the present; (2) identify the periods of anoxia and meromictic conditions in the lake; and (3) evaluate the interactions between climate variability / human activity, and their impact on the lake environment.
We will explore and implement the novel technology of hyperspectral imaging (HSI) which allows measurements of specific and diagnostic biomarker proxies in lake sediments at unprecedented spatial resolution and in a very cost-effective and rapid way. HSI is a non-destructive multi-channel reflectance spectroscopy in the visible and near-infrared range (VNIR). This technique can be used to identify organic substances and minerals in sediments on the basis of their diagnostic color absorption properties. This approach will be implemented on excellently preserved varved sediments of Lake Gorzyńskie in northwestern Poland, and supported by wider set of proxies (pollen, diatoms, Cladocera) indicating changes in the catchment land-use and lake productivity. With our project we address the following research questions: Were the periods of anoxia consistent with paleoproductivity changes? How was anoxia affected by climate variability and/or anthropogenic disturbance in the catchment (deforestation, erosion, nutrient cycling)? How did Holocene paleoproductivity and anoxia developed during the transition from a nature-dominated to a human-dominated environment? Is the most recent time unusual within the Holocene?
The project will be implemented in cooperation with AMU Poznań, IO PAS Sopot, IGSO PAS Warszawa, Bern University, and Bremen University.
New paper presenting our results from Lake Jaczno has just been published in Biogeosciences. Stamatina Makri and co-authors use a complete varved sediment record from this lake to reconstruct the variability of primary production and water column oxygen concentrations during the Holocene. We used recently developed hyperspectral imaging (HSI) techniques to quantify sedimentary chloropigments-a and bacteriopheopigments-a at sub-annual resolution, in combination with micro XRF scanning data and HPLC pigment assemblage data. This study demonstrates a clear link between lake biogeochemical processes and human activity in the catchment. The research was done in a cooperation with colleagues from the University of Bern. Happy reading!
Makri S., Lami A., Luyao T., Tylmann W., Vogel H., Grosjean M. 2021 Holocene phototrophic community and anoxia dynamics in meromictic Lake Jaczno (NE Poland) using high-resolution hyperspectral imaging and HPLC data. Biogeosciences, 18, 1839-1856. DOI 10.5194/bg-18-1839-2021. LINK
New paper presenting historical records of trace elements in high Andean lakes in Ecuador has been published in Environmental Science and Pollution Research. In this publication, we investigate two lakes (Laguna Fondococha and Laguna Llaviucu) located at different elevations to understand how trace element fluxes are related to the catchment geology, erosion, local point sources and atmospheric loads. The investigations were coordinated by Prof. Martin Grosjean from the University of Bern. Happy reading!
Schneider T., Bandowe B.A.M., Bigalke M., Mestrot A., Hampel H., Mosquera P.V., Frankl L., Wienhues G., Vogel H., Tylmann W., Grosjean M., 2020. 250-year records of mercury and trace element deposition in two lakes from Cajas National Park, SW Ecuadorian Andes. Environmental Science and Pollution Research. DOI 10.1007/s11356-020-11437-0. LINK
New paper presenting our results from Lake Żabińskie has just been published online in Science of the Total Environment. Paul Zander and co-authors use a Holocene-long varved sediment record to answer the research questions about the variability of primary production and water column oxygen concentrations during the past 10,800 years, and the role of natural and anthropogenic forces in driving these changes. We used recently developed hyperspectral imaging (HSI) techniques to quantify sedimentary chloropigments-a and bacteriopheopigments-a at sub-annual resolution, in combination with micro XRF scanning data and HPLC pigment assemblage data. This study demonstrates a clear link between lake biogeochemical processes and forest cover in the catchment and shows the potential of HSI to produce extremely high-resolution records of past productivity and redox conditions from varved lake sediments. The research was done in a cooperation with colleagues from the University of Bern. Happy reading!
Zander P., Żarczyński M., Vogel H., Tylmann W., Wacnik A., Sanchini A., Grosjean M., 2020. A high-resolution record of Holocene primary productivity and water-column mixing from the varved sediments of Lake Żabińskie, Poland. Science of the Total Environment. DOI 10.1016/j.scitotenv.2020.143713. LINK
Gosia Kinder and co-workers have just published a paper presenting new cryptotephra findings of historical and modern Icelandic eruptions (e.g. Askja AD 1875, Hekla AD 1845, Eyjafjallajökull AD 2010) in annually laminated lacustrine sediment records from several sites within a SW–NE transect across northern Poland. These new findings extend the tephra dispersal map towards the south‐east and provide valuable isochrons for the synchronisation of palaeoclimate proxy data. Happy reading!
Kinder M., Wulf S., Appelt O., 2020. Detection of the historical Askja AD 1875 and modern Icelandic cryptotephras in varved lake sediments – results from a first systematic search in northern Poland. Journal of Quaternary Science. DOI 10.1002/jqs.3259. LINK
We are pleased to announce that Alicja Bonk from our lab has been awarded the PAGES Early-Career Award. PAGES recognized her expertize in paleolimnology, her cross-disciplinary work to improve knowledge of past global changes in East-Central Europe, and her ability to establish new collaborations. The ECA Committee also took into consideration her involvement in the development of the PAGES Early-Career Network (ECN) and continued work within the group.
The award will be presented at PAGES’ 6th Open Science Meeting (OSM) in Agadir, Morocco, in May 2022. Congratulations!
The Polish National Agency for Academic Exchange has just announced the results of the Stanisław Ulam program. The aim of the program is to increase the level of internationalization of Polish universities and scientific institutions through visits of foreign scientists. One of the winners is Dr. Guillermo de Mendoza Barbera, who received a 24-month scholarship and will join our team in January 2021.
Dr. Guillermo de Mendoza Barbera obtained his PhD in ecology from the University of Barcelona. He worked as a postdoctoral researcher at the French National Center for Scientific Research (CNRS) in Toulouse, and at the University of California, Berkeley. He is a specialist in taxonomy and ecology of midges (Diptera: Chironomidae) and their applications in paleoenvironemental studies. At the ECR Lab, he will implement a project aiming at Holocene-long temperature reconstructions for northern Poland. Welcome, Guillermo!
On October 2-7th, we cored complete sequences of bottom sediments from Lake Gorzyńskie in northwestern Poland. Field work was done by a joint German-Polish team including: Bernd Zolitschka, Christian Ohlendorf, Rafael Stiens, Maurycy Żarczyński and Wojciech Tylmann. Thanks to the help of our colleagues from the University of Bremen we recovered more than 30 m of sediment cores from the bottom of this lake.
New paper presenting our results from Lake Łazduny has just been published in Journal of Quaternary Science. We show ~9700 cal a BP record of changes in lake productivity, oxygen conditions and mixing regime. A stepwise change from oligotrophic Early Holocene conditions to mesotrophic conditions in the Mid- and Late Holocene is documented with sedimentary pigments analyzed in varved sediments. This study was done in a cooperation with colleagues from the University of Bern. Happy reading!
Sanchini A., Szidat S., Tylmann W., Vogel H., Wacnik A., Grosjean M., 2020. A Holocene high-resolution record of aquatic productivity, seasonal anoxia and meromixis from varved sediments of Lake Łazduny, North-Eastern Poland: insight from a novel multi-proxy approach. Journal of Quaternary Science. DOI 10.1002/jqs.3242. LINK
Maurycy Żarczyński has just received the NCN grant for preliminary investigations of lakes in Georgia. He will be working on the project “Investigating the potential of lake sediments in Georgia for reconstructions of environmental changes during the Holocene”. The field expedition is planned for the next year in cooperation with our Georgian colleagues. Good luck!