INQUA Focus Group QUASAP (2012-2019)
Focus Group Leaders
Daniela Sauer, University of Göttingen, daniela.sauer@geo.uni-goettingen.de
Sergey Sedov, UNAM Mexico City, sergey@geol-sun.igeolcu.unam.mx
Dennis Dahms, University of Northern Iowa, dennis.dahms@uni.edu
Markus Egli, University of Zurich, markus.egli@geo.uzh.ch
Fabio Scarciglia, University of Calabria, fabio.scarciglia@unical.it
Pauline Y.D. Da Costa, University of Lomé, Togo, dzycosta@yahoo.fr
Dust storm on Slims River delta, Kluane Lake
(July 2009). Photo: Paul Sanborn.
Terrestrial sediment
sequences of various origins (e.g., deposited by rivers, wind or slope
processes) represent valuable archives of Quaternary regional environmental
changes. In periods of vegetation cover and stable land surfaces, soils start forming
on these sediments. Thus, successions of sediments may contain intercalated fossil
soils (palaeosols), recording phases of relative land surface stability. In
contrast, each slope sediment layer burying a soil indicates an event or
episode of slope instability due to climatic forcing or tectonics.
Whereas e.g. marine
sediments and ice cores provide detailed records of global climatic trends, the
strengths of terrestrial sediment-palaeosol records are that (1) they have wide
spatial distribution and thus enable the detection of regional spatial patterns
in palaeo-environmental conditions, and (2) in addition to palaeoclimatic
information sediment-palaeosol successions record also the responses of landscapes
to palaeo-climatic shifts. For instance, burial of a soil by a slope deposit
may indicate that a climatic shift has reached a threshold at which a change
from stable to dynamic land surface is initiated.
However, the use of
palaeosols as a record of periods of stable land surfaces and environmental
shifts within these periods requires profound knowledge on directions and rates
of soil forming processes in different climates. The focus group QUASAP is
making such knowledge available for future palaeo-environmental reconstructions.
The group aims at assessing rates of soil forming processes in different
climates, obtained from soils and palaeosols in settings where climatic
conditions and duration of soil development are known.
Over the last years,
the IFG QUASAP organized a series of field workshops, providing much time for
discussions at the sediment-soil sections that were examined together. Through
these discussions, international scientific collaborations have been initiated,
and will most likely also be initiated during the upcoming workshops in 2018
(Yukon Territories) and 2019 (Ghent, Belgium). Joint projects involving
colleagues from high- and low-income countries will be particularly encouraged,
as the greatest knowledge gaps have been identified in Africa. This situation
can only be improved through international collaboration in the respective
regions.