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

2020 ◽  
Vol 35 (8) ◽  
pp. 1070-1080 ◽  
Author(s):  
Andrea Sanchini ◽  
Sönke Szidat ◽  
Wojciech Tylmann ◽  
Hendrik Vogel ◽  
Agnieszka Wacnik ◽  
...  
Keyword(s):  
High Resolution ◽  
Varved Sediments ◽  
North Eastern ◽  
Aquatic Productivity

scholarly journals Late Quaternary climate change in the north-eastern highlands of Ethiopia: A high resolution 15,600 year diatom and pigment record from Lake Hayk

2018 ◽  
Vol 202 ◽  
pp. 166-181 ◽  
Author(s):  
Katie L. Loakes ◽  
David B. Ryves ◽  
Henry F. Lamb ◽  
Frank Schäbitz ◽  
Michael Dee ◽  
...  
Keyword(s):  
Climate Change ◽  
High Resolution ◽  
Late Quaternary ◽  
The North ◽  
Quaternary Climate ◽  
North Eastern ◽  
Eastern Highlands

scholarly journals VARDA (VArved sediments DAtabase) – providing and connecting proxy data from annually laminated lake sediments

2020 ◽  
Author(s):  
Arne Ramisch ◽  
Alexander Brauser ◽  
Mario Dorn ◽  
Cecile Blanchet ◽  
Brian Brademann ◽  
...  
Keyword(s):  
High Resolution ◽  
Lake Sediments ◽  
Climate Models ◽  
Detailed Comparison ◽  
High Temporal Resolution ◽  
Proxy Data ◽  
Varved Sediments ◽  
Proxy Records ◽  
Data Compilation ◽  
Varved Lake Sediments

Abstract. Varved lake sediments provide long climatic records with high temporal resolution and low associated age uncertainty. Robust and detailed comparison of well-dated and annually laminated sediment records is crucial for reconstructing abrupt and regionally time-transgressive changes as well as validation of spatial and temporal trajectories of past climatic changes. The VARved sediments DAtabase (VARDA) presented here is the first data compilation for varve chronologies and associated palaeoclimatic proxy records. The current version 1.0 allows detailed comparison of published varve records from 95 lakes. VARDA is freely accessible and was created to assess outputs from climate models with high-resolution terrestrial palaeoclimatic proxies. VARDA additionally provides a technical environment that enables to explore the database of varved lake sediments using a connected data-model and can generate a state-of-the-art graphic representation of multi-site comparison. This allows to reassess existing chronologies and tephra events to synchronize and compare even distant varved lake records. Furthermore, the present version of VARDA permits to explore varve thickness data. In this paper, we report in detail on the data mining and compilation strategies for the identification of varved lakes and assimilation of high-resolution chronologies as well as the technical infrastructure of the database. Additional paleoclimate proxy data will be provided in forthcoming updates. The VARDA graph-database and user interface can be accessed online at https://varve.gfz-potsdam.de, all datasets of version 1.0 are available at http://doi.org/10.5880/GFZ.4.3.2019.003 (Ramisch et al., 2019).

A high-resolution sedimentary archive from landslide-dammed Lake Mengda, north-eastern Tibetan Plateau

2012 ◽  
Vol 51 (2) ◽  
pp. 303-312 ◽  
Author(s):  
Yongbo Wang ◽  
Ulrike Herzschuh ◽  
Xingqi Liu ◽  
Oliver Korup ◽  
Bernhard Diekmann
Keyword(s):  
High Resolution ◽  
Tibetan Plateau ◽  
Eastern Tibetan Plateau ◽  
North Eastern ◽  
Dammed Lake

Minor element variations during the past 1300 years in the varved sediments of Lake Xiaolongwan, north-eastern China

GFF ◽  
2013 ◽  
Vol 135 (3-4) ◽  
pp. 265-272 ◽  
Author(s):  
Guoqiang Chu ◽  
Qing Sun ◽  
Shengqiang Li ◽  
Yuan Lin ◽  
Xiaohua Wang ◽  
...  
Keyword(s):  
Eastern China ◽  
Minor Element ◽  
Varved Sediments ◽  
The Past ◽  
North Eastern

scholarly journals Determination of Hydro Geological and Petroleum Potential Using High Resolution Aeromagnetic Data, Over Matsina and Environs, Part of Nigerian Sector of Chad Basin, North Eastern Nigeria

2019 ◽  
pp. 1-12
Author(s):  
S. Kasidi ◽  
S. N. Yusuf
Keyword(s):  
High Resolution ◽  
Ground Water ◽  
Two Dimensional ◽  
Oil Exploration ◽  
Aeromagnetic Data ◽  
Spectral Analyses ◽  
Petroleum Potential ◽  
Chad Basin ◽  
North Eastern

Two dimensional spectral analyses of high resolution aeromagnetic data was carried out over matsina and environs North Eastern Nigeria to determine hydrocarbon and groundwater potentials. The analysis was done using Oasis Montaj version 8.2. The result obtained indicates the existence of two source depths. The shallower magnetic sources varies between 0.35 to 0.55 m and deeper magnetic sources also varies between 0.6 to 2000 m. The shallower magnetic sources could be as a result of basic intrusive within the Borno Basin, while the deeper sources correspond to the basement topography underlying the Chad formation. Comparing the result with what was obtained in Gubio, Maiduguri sub basin, it is apparent that the sedimentary thickness over Matsina and and Environs cannot be a potential site for oil exploration rather for ground water exploration.

scholarly journals Radiocarbon Wiggle-Match Dating of Bulk Sediments—How Accurate can It Be?

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1173-1186 ◽  
Author(s):  
Anette Mellström ◽  
Raimund Muscheler ◽  
Ian Snowball ◽  
Wenxin Ning ◽  
Eeva Haltia
Keyword(s):  
Solar Activity ◽  
High Resolution ◽  
Confidence Interval ◽  
Climate Changes ◽  
Plant Macrofossils ◽  
Southern Sweden ◽  
Varved Sediments ◽  
Uncertainty Range ◽  
Climate Studies ◽  
Reservoir Age

We used the radiocarbon wiggle-match dating technique to date the varved sediments of Lake Gyltigesjön in southern Sweden with the main aim to construct an accurate chronology covering the period between about 3000 and 2000 cal BP. Wiggle-match dating was applied to bulk sediments to evaluate the possibility of constructing accurate chronologies in the absence of terrestrial plant macrofossils and when the amount of old carbon in the sediments is unknown. Facilitated by a floating varve chronology and relatively stable 14C reservoir ages, the results show the possibility to assess the contribution of old carbon solely based on the 14C wiggle-matching of bulk sediments. We confirm the wiggle-matched chronology and the 14C reservoir age of approximately 260 yr by cross-checking the results with 14C dating of macrofossils. The obtained calibrated ages based on bulk sediments have an uncertainty range of about 60–65 yr (95.4% confidence interval). This study confirms that 14C wiggle-match dating of bulk sediments is a viable tool when constructing high-resolution chronologies. The method is especially useful in Sun-climate studies since the timing between solar activity variations (expressed as 14C variations) and climate changes can be accurately determined.

Sign in / Sign up

Export Citation Format

Share Document