♣Chemical
Geology♣
1. Compound-specific
carbon and nitrogen isotopic compositions of chlorophyll a and its derivatives
reveal the eutrophication history of Lake Zurich (Switzerland)
Sebastian Naeher , Hisami Suga, Nanako O.
Ogawa, Carsten J. Schubert, Kliti Grice, Naohiko Ohkouchi
•Pigment distributions reflect rapid
pheopigment formation in water column and sediments.
•δ13C and δ15N values of chlorins follow
historical trends of eutrophication and reoligotrophication.
•Historical trends in δ15N values of chlorins
mainly related to population changes of Planktothrix rubescens.
•δ15N offsets of pigments in surface sediment
explained by higher contributions of laterally transported OM
2. Behavior of U, Th and
Ra isotopes in soils during a land cover change
Sophie Rihs, Adrien Gontier, Eric Pelt, David
Fries, Marie-Pierre Turpault, François Chabaux
♣Quaternary
Science Reviews♣
3. Natural and
anthropogenic drivers of cultural change on Easter Island: Review and new
insights
Valentí Rull
•Easter Island's cultural change is analyzed
from a holistic perspective.
•Two, possibly three, social shifts occurred
during the las millennium.
•Drought, deforestation and external cultural
influence played a role.
4. Holocene paleoclimate
inferred from salinity histories of adjacent lakes in southwestern Sicily
(Italy)
Brandon Currya, , , Paul D. Henneb,
c, Francesc Mezquita-Joanesd, Federico Marronee,
Valentina Pierif, Tommaso La Mantiag, Camilla Calòc,
Willy Tinner
•Holocene paleosalinity reconstructions from
two adjacent lakes in coastal Sicily have different trends and values.
•An abrupt rise in paleosalinity at 6250 cal
yr BP at Lago Preola is attributed to the intrusion and diffusion of sea water.
•Paleosalinity of Gorgo Basso was highest
during the early Holocene, and lowest during the last 2000 years.
•Gorgo Basso’s decline in salinity during the
late Holocene reflects increased effective moisture.
•Isotopic data indicate relatively more early
Holocene winter precipitation than during the late Holocene.
5. Long-term record of
Barents Sea Ice Sheet advance to the shelf edge from a 140,000 year record
Ed L. Popea, , , Peter J. Tallinga,
b, James E. Hunta, Julian A. Dowdeswellc,
Joshua R. Allina, Matthieu J.B. Cartignya, David Longd,
Alessandro Mozzatoa, Jennifer D. Stanforde, David R.
Tappind, Millie Watts
•New Barents Sea Ice Sheet history for last
140,000 years is reconstructed.
•Glacigenic-debris flows are used to
reconstruct ice-sheet history.
•Four advances to the shelf edge of the
Bjørnøyrenna Trough are reconstructed.
•Weichselian and Saalian Barents Sea Ice
Sheets had different configurations.
•Saalian ice-sheet was stable at the shelf
edge longer than any Weichselian ice-sheet.
6. Identification of the Changbaishan
‘Millennium’ (B-Tm) eruption deposit in the Lake Suigetsu (SG06) sedimentary
archive, Japan: Synchronisation of hemispheric-wide palaeoclimate archives
Danielle McLeana, , , Paul G.
Alberta, Takeshi Nakagawab, c, Richard A. Staffa,
Takehiko Suzukid, Suigetsu 2006 Project Members1,
Victoria C. Smith
•East Asian palaeoclimate record synchronised
to the Greenland ice cores using tephra.
•Suggests more ash layers that are common to
both archives will be discovered.
•Lake Suigetsu records, to date, the most
southerly occurrence of the B-Tm tephra.
•Identification of the B-Tm helps constrain
the Holocene chronology of the SG06 core.
♣Earth
and Planetary Science Letters♣
7. Regolith evolution on
the millennial timescale from combined U–Th–Ra isotopes and in situ cosmogenic
10Be analysis in a weathering profile (Strengbach catchment, France)
J. Ackerer, F. Chabaux, J. Van der Woerd, D.
Viville, E. Pelt, E. Kali, C. Lerouge, P. Ackerer, R. di Chiara Roupert, P.
Négrel
•Analysis of U-series isotopes and in situ
10Be in a single regolith profile.
•Independent determination of long term
regolith denudation and production rates.
•Lower regolith is the most suitable place to
quantify regolith production rate.
•A high spatial resolution profile is
required for an extensive modeling of in situ 10Be.
•Higher temporal variability of physical
erosion than chemical weathering.
8. The cosmogenic record
of mountain erosion transmitted across a foreland basin: Source-to-sink
analysis of in situ10Be, 26Al and 21Ne in sediment of the Po river catchment
Hella Wittmann, Marco G. Malusà, Alberto
Resentini, Eduardo Garzanti, Samuel Niedermann
9. Synchronicity of
Kuroshio Current and climate system variability since the Last Glacial Maximum
Xufeng Zheng, Anchun Li, ShuhJi Kao, Xun
Gong, Martin Frank, Gerhard Kuhn, Wenju Cai, Hong Yang, Shiming Wan, Honghai
Zhang, Fuqing Jiang, Edmund Hathorne, Zhong Chen, Bangqi Hu
•Kuroshio Current proxy was established by
statistical analyses on grain size spectrum.
•Sr–Nd isotope analyses on Kuroshio grain
size spectrum reveals source of Taiwan.
•Synchronous shift in ENSO and the North
Pacific Gyre is subject to the insolation.
•Earth System Modeling results confirm our
proxies-indicated Kuroshio Current strength.
10. When and why
sediments fail to record the geomagnetic field during polarity reversals
Jean-Pierre Valeta, , , Laure
Meynadiera, Quentin Simonb, Nicolas Thouveny
•Reversal records from sediments with v<5 cm="" did="" directions.="" kyr="" not="" o:p="" provide="" suitable="">
•No characteristic component is isolated from
weakly and highly magnetized sediments as well.
•Rapid field changes are integrated within a
2 cm sample and yield multiple magnetic components.
•When present post-depositional processes
smear out the signal and provide unsuitable records.
•Current paleomagnetic techniques are not
appropriate for reversal studies from sediments.
♣Palaeogeography,
Paleoclimatology, Paleoecology♣
♣Quaternary Research♣♣Geochimica et Cosmochimica Acta♣
♣Quaternary Geochronology♣
♣Global and Planetary Change♣
♣Quaternary International♣
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