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Calibrating and validating scanning VIS Reflectance Spectroscopy data (380 - 730 nm) from minerogenic and biochemical varves: improving climate reconstructions from lake sediments

English title Calibrating and validating scanning VIS Reflectance Spectroscopy data (380 - 730 nm) from minerogenic and biochemical varves: improving climate reconstructions from lake sediments
Applicant Grosjean Martin
Number 134945
Funding scheme Project funding (Div. I-III)
Research institution Oeschger-Zentrum für Klimaforschung Universität Bern
Institution of higher education University of Berne - BE
Main discipline Other disciplines of Environmental Sciences
Start/End 01.12.2011 - 30.11.2014
Approved amount 197'849.00
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All Disciplines (2)

Discipline
Other disciplines of Environmental Sciences
Other disciplines of Earth Sciences

Keywords (6)

Climate Change; Paleoclimate; Sedimentology; Holocene; Switzerland; limnology

Lay Summary (English)

Lead
Lay summary
Seasonal to annual quantitative reconstructions of spatially-explicit climate state variables for the last 2000 years across the world are recognized as one of the primary targets for current climate research. Varved (annually laminated) lake sediments play a key role in this context because they provide seasonally resolved paleoclimate archives with a very good chronology. The minerogenic varves in Lake Oeschinen, a proglacial lake in the northern Swiss Alps will be used to establish the first quantitative summer precipitation record back to ca. 1000 AD for Switzerland. In a pilot study for the varves AD 1920-1986, we have established that varve thickness and mineralogical composition is a good predictor for MJJA precipitation (r=0.64, p<0.05). Phyllosilicate influx is related to rain stroms whereas calcite influx is related to glacial meltwater. Novel scanning techniques (reflectance spectroscopy 380-730 nm) will be explored to analyze sediment compositions at very high (mm-scale) resolution.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Hyperspectral imaging of sedimentary bacterial pigments: A 1728 years long history of meromixis in varved Lake Jaczno, north eastern Poland
ButzC. Grosjean M. Goslar T. Tylmann W. (2017), Hyperspectral imaging of sedimentary bacterial pigments: A 1728 years long history of meromixis in varved Lake Jaczno, north eastern Poland, in Journal of Paleolimnology, 58(1), 57-72.
Sedimentary Bacteriopheophytin a as an indicator of meromixis in varved lake sediments of Lake Jaczno, north-east Poland, AD 1891 – 2010
Butz C. Grosjean M. Poraj-Górska A. Enters D. Tylmann W. (2016), Sedimentary Bacteriopheophytin a as an indicator of meromixis in varved lake sediments of Lake Jaczno, north-east Poland, AD 1891 – 2010, in Global and Planetary Change , 144, 109-118.
A millennial-long record of warm season precipitation and flood frequency for the North-western Alps inferred from varved lake sediments: implications for the future
Amann B. Szidat S. Grosjean M. (2015), A millennial-long record of warm season precipitation and flood frequency for the North-western Alps inferred from varved lake sediments: implications for the future, in Quaternary Science Reviews , 115, 89-100.
Hyperspectral imaging spectroscopy: A promising method for the biogeochemical analysis of lake sediments
ButzC. Grosjean M. Fischer D. Wunderle S. Tylmann W. Rein B. (2015), Hyperspectral imaging spectroscopy: A promising method for the biogeochemical analysis of lake sediments, in Journal of Applied Remote Sensing , 9(096031), 1-20.
Hyperspectral imaging: a novel, nondestructive method for investigating subannual sediment structures and composition
Grosjean M. Amann B. Butz C. Rein B. Tylmann W. (2014), Hyperspectral imaging: a novel, nondestructive method for investigating subannual sediment structures and composition, in PAGES Magazine, 22(1), 10-11.
Quantitative high-resolution warm season rainfall recorded in varved sediments of Lake Oeschinen, northern Swiss Alps: calibration and validation AD 1901-2008
Amann Benjamin, Mauchle Fabian, Grosjean Martin (2014), Quantitative high-resolution warm season rainfall recorded in varved sediments of Lake Oeschinen, northern Swiss Alps: calibration and validation AD 1901-2008, in Journal of Paleolimnology, 51, 375-391.
Spring temperature variability and eutrophication history inferred from sedimentary pigments in the varved sediments of Lake Żabińskie, north-eastern Poland, 1907 – 2008 AD
Amann B. Lobsiger S. Fischer D. Tylmann W. Bonk A. Filipiak J. Grosjean M (2014), Spring temperature variability and eutrophication history inferred from sedimentary pigments in the varved sediments of Lake Żabińskie, north-eastern Poland, 1907 – 2008 AD, in Global and Planetary Change, 123, 86-96.

Collaboration

Group / person Country
Types of collaboration
Prof. D. Ariztegui, U Geneva Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Oeschger Center Consortium / NCCR Climate Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
- Exchange of personnel
EU FP6 'Millennium' consortium Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
PD Bert Rein, U Mainz & GeoConsult Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
IGBP-PAGES Past Global Changes Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. F. Anselmetti, UniBE Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
PD Dr. W. Thylmann, U Gdansk Poland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
Dr. A. Gilli, ETH Zurich Switzerland (Europe)
- Research Infrastructure
Prof. Bernd Zolitschka, U Bremen Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
The Coldest Decade of the Millennium? The Spörer Minimum, the Climate during the 1430s, and its Economic, Social and Cultural Impact. Talk given at a conference The Spörer minimum represented in lake sediments: case studies from the Alps and Poland 04.12.2014 Bern, Switzerland Amann Benjamin;
4th Climpol workshop Talk given at a conference Sedimentary pigments & VIS-RS data – Potential for a 1000 yr climate reconstruction 11.09.2014 Gdansk, Poland Grosjean Martin; Amann Benjamin;
PAGES 2k International Conference - Climate variability and human impacts in Central and Eastern Europe during the last two millennia Talk given at a conference Spring (MAM) temperature signal in the varved sediments of Lake Zabinskie, NE Poland - Calibration and reconstruction back to AD 1600 17.06.2014 Gdansk, Poland Grosjean Martin; Amann Benjamin;
EGU General Assembly 2014 [Vienna, Austria] Poster Quantitative high-resolution rainfall reconstruction back to AD 750 from the varved sediments of Lake Oeschinen, northern Swiss Alps 27.04.2014 Vienna, Austria Amann Benjamin; Grosjean Martin;
EGU General Assembly 2014 [Vienna, Austria] Poster Spring-temperature variability and eutrophication history inferred from sedimentary pigments in the varved sediments of Lake Żabińskie, NE Poland 27.04.2014 Vienna, Austria Amann Benjamin; Grosjean Martin;
15th Swiss Global Change Day [Bern, Switzerland] Poster Varved lake sediments for quantitative climate research 02.04.2014 Bern, Switzerland Grosjean Martin; Amann Benjamin;
11th Swiss Geoscience Meeting Talk given at a conference Scanning reflectance spectroscopy (380-730 nm) for Paleoenvironmental and climatic changes assessment 16.11.2013 Lausanne, Switzerland Grosjean Martin; Amann Benjamin;
3rd Climpol workshop Talk given at a conference Geochemical proxies: calibration with climate data 13.09.2013 Jeziorowskie, Poland Grosjean Martin; Amann Benjamin;
12th International NCCR Climate Summer School “From climate reconstructions to climate predictions” Poster Varved lake sediments for quantitative climate research 01.09.2013 Grindelwald, Switzerland Grosjean Martin; Amann Benjamin;
14th Swiss Global Change Day Poster Varved Lake Oeschinen, Swiss Alps: quantitative assessment of precipitation signal in the sediments 16.04.2013 Bern, Switzerland Amann Benjamin; Grosjean Martin;
10th Swiss Geoscience Meeting 2012 Poster Varved Lake Oeschinen: quantitative assessment of climate signal in the sediments 17.11.2012 Bern, Switzerland, Switzerland Amann Benjamin; Grosjean Martin;
2nd ClimPol Workshop 2012 Talk given at a conference High-resolution VIS-RS scanning 18.10.2012 Gdansk, Poland, Poland Amann Benjamin; Grosjean Martin;
11th International NCCR Climate Summer School “The Water Cycle in a Changing Climate. Observations, Scenarios, Impacts” Poster Quantitative summer (MJJA) precipitation; calibration and validation from varved Lake Oeschinen, Swiss Alps 09.09.2012 CSF Monte Verita, Switzerland, Switzerland Grosjean Martin; Amann Benjamin;
13th Swiss Global Change Day Poster A promising site for high-resolution multi-proxy European paleoclimate reconstructions: the last millennium from northern Poland 04.04.2012 Bern, Switzerland, Switzerland Amann Benjamin; Grosjean Martin;
IGBP-PAGES 3rd Varve Working Group Workshop Talk given at a conference Quantitative summer MJJA precipitation and rainstorms from varved Lake Oeschinen, Swiss Alps: calibration and validation AD 1920-1986 20.03.2012 Manderscheid, Germany, Germany Amann Benjamin; Grosjean Martin;


Associated projects

Number Title Start Funding scheme
172586 Exploring VNIR/SWIR Hyperspectral Imaging of Varved Lake Sediments: Methods and Applications in Paleoclimatology and Paleoecology 01.07.2017 Project funding (Div. I-III)
152986 Climate variability in the SW Ecuadorian Andes of the past two millennia: a contribution to IGBP-PAGES 2k 01.07.2014 Project funding (Div. I-III)
116005 Annual- to decadal-scale quantitative climate reconstructions from varved Alpine lake sediments for the last 3300 years / ENLARGE II 01.02.2008 Project funding (Div. I-III)
121869 Scanning in-situ reflectance spectroscopy as a novel tool for high-resolution climate reconstructions from lake sediments, southern Chile 01.12.2008 Project funding (Div. I-III)

Abstract

Seasonal to annual quantitative reconstructions of spatially-explicit climate state variables for the last 2000 years across the world are recognized as one of the primary targets for current climate research (IGBP-PAGES/WCRP-CLIVAR. This builds on the rationale that knowledge about the natural, forced and stochastic variability at different scales, rates of change and probabilities of extremes is critical (i) to discriminate the human fingerprint on the global climate in the 20th century (detection and attribution) and (ii) to reduce uncertainty for ecological, societal and economic risks when natural variability and anthropogenic forcings are superposed in a future warmer climate.Varved (annually laminated) lake sediments play a key role in this context. They provide very highly resolved (seasonal to annual) paleoclimate archives with a very good chronology spanning over long periods (several millennia). They may provide information in areas where other annually resolved paleoclimate archives are short in length or not available. It is also recognized that lake sediments may preserve signals of low-frequency climate variability, which is one of the moist critical challenges for climate reconstructions.However, well-calibrated, quantified annually resolved millennial-long records are very difficult to obtain from lake sediments: the analytical work is enormous, precise and accurate chronologies are difficult to establish, and calibration has remained a challenge. In consequence, research priorities include two targets: (i) development of rapid, scanning and non-destructive techniques and (ii) development of numerical tools for calibrations.This has been the target of research in the Paleolimnology Group U Bern over the past years. We have implemented and developed novel scanning Reflectance Spectroscopy (380 - 730 nm, VIS RS) with direct measurements of fresh split sediment cores, and have converted VIS RS data into quantitative measures of climate variables. This has produced remarkable data sets for climate reconstructions and generated growing interest and international recognition: In first case studies from Chile, Tasmania and the Alps we show that VIS RS data indicative of minerogenic compounds (mainly illite and chlorite) and sedimentary pigments provide excellent quantitative summer temperature and summer precipitation reconstructions for the past 1000 years. However, interpreting VIS RS data is still in its infancy and poorly understood. Calibration of VIS RS data with concentration and composition of specific sediment compounds is the recognized methodological gap.This proposal is the logic continuation of NF 200021-116005 (‘Late Holocene varved sediments from Lake Silvaplana’) and seeks funding to calibrate VIS RS data of minerogenic and biochemical varved lake sediments with specific compositions of minerals and sedimentary pigments, respectively as determined with established analytical methods (XRD, XRF elemental mapping, microscopy of thin sections, extraction and HPLC, biogenic Si and TOC/N). In consequence, the proposed research develops along two major thrusts:Thrust 1: Calibrate VIS RS data from minerogenic varves in Lake Oeschinen with phyllosilicate/calcite ratios and reconstruct MJJA precipitation back to ca. 1000 AD. In a pilot study for the varves 1920-1986, we have established that varve thickness is a good predictor for MJJA precipitation (r=0.64, p<0.05), that phyllosilicate influx is related to rain stroms whereas calcite influx is related to glacial meltwater. Using this information we will (i) Refine the “sediment proxy - climate” calibration, (ii) Calibrate/validate VIS RS data with ‘synthetic sediments’ and sediment short cores, and (iii) Reconstruct summer precipitation back to ca. 1000 AD.Thrust 2: Calibrate VIS RS data from biochemical varves in Lake Lazduny, Poland with sedimentary pigments. Many of the VIS RS-bases climate reconstructions target reflectance features indicative of sedimentary pigments. Currently, our understanding of these features is unspecific and interpretations speculative (or missing). We have carefully selected biochemical varves from lake Lazduny to (i) Calibrate VIS RS data with concentrations and composition of sedimentary pigments (HPLC), (ii) Calibrate autigenic calcite with VIS RS data, and (iii) asses the skill of this data set fro climate reconstructions. The project has a methodological component (relevant to many other research groups) and a data/result component (directly relevant to international climate research programmes IGBP-PAGES and WCRP-CLIVAR).
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