This email is to remind you to contribute to a session (numbered BG4.2) at
the European Geosciences Union General Assembly 2013
“Freshwater Carbon Cycling: Determining the source, fate and age of carbon
in freshwater systems.” The submission deadline is approaching so ease submit at the EGU
(Session details at the end of this message).
If you would be willing to contribute, we would be extremely pleased to
include you. We do need to mention that unfortunately there’s no direct
funding provided by EGU to support session contributions.
The session context:
Understanding freshwater carbon dynamics is crucial to our comprehension of
global carbon biogeochemistry. A key step is quantitative and qualitative
knowledge of the source, age and fate of freshwater carbon, requiring a
multi-disciplinary approach in which radiocarbon (14C) is a particularly
useful analytical tool. The aim of this interdisciplinary session is to
provide an opportunity for exchange between researchers in this field, with
a focus on quantifying spatio-temporal variation in freshwater systems,
discriminating between modern, old and fossil carbon, and the development of
novel analytical methods.
The EGU meeting will be hosted in Vienna from the 07 – 12 April 2013
(http://www.egu2013.eu/).This conference, which attracts more than 10,000
participants every year, brings together geoscientists from all over the
world covering all disciplines of the Earth, Planetary and Space Sciences.
Our session will be part of the Biogeosciences Division, and is listed under
Fresh water Biogeosciences.
We would be very pleased if you were able to present your view on this
subject in the session. The deadline for abstracts is 9 January. Please also
do feel free to pass this call on to colleagues you think may be interested!
With very best wishes,
Philippa Ascough ([log in to unmask])
Evelyn Keaveney ([log in to unmask])
Jesper Olsen ([log in to unmask])
Freshwater systems are a key component of the global carbon cycle,
transporting allochthonous (terrestrial) carbon to the sea. Such systems are
not merely conduits between terrestrial and marine environments, but are
themselves a dynamic reservoir, in which carbon can be incorporated into
biota, sequestered in sediments, or effluxed to the atmosphere.
Understanding the turnover of carbon in freshwater systems is a critical
step, not only in completing our picture of global carbon biogeochemistry,
but because of the effects of accelerating climatic changes. For example,
terrestrial DOC, previously stored in soil stocks, is released with
increased temperature, precipitation and frequency of flood events.
Determining and quantifying the source, age and fate of freshwater carbon is
therefore an important research goal. Such investigations demand the
integration of multiple analytical techniques, of which radiocarbon (14C) is
a particularly useful tool. Along with crucial chronological information,
14C allows ultra-sensitive discrimination of different end members. These
include including allochthonous versus autochthonous (derived from primary
production) carbon, plus the quantification of modern, old and fossil carbon
in freshwater systems (Ascough et al. 2007, 2010; Olsen 2009; Zigah et al
2012; Keaveney 2012). Current applications include analysis of temporal and
spatial variation in dissolved inorganic carbon, dissolved organic carbon,
and particulate organic matter, as well as changes over time as a result of
allochthonous inputs (Raymond et al. 2004). Research advances are following
from the recent development of novel analytical methods such as stepped
combustion (McGeehin et al. 2001; Rosenheim et al. 2008) opening many new
possibilities to examine freshwater carbon dynamics. We invite papers which
address the themes of this session, particularly those following the themes
Determining the source and age of terrestrial carbon in a freshwater system
• Quantifying the terrestrial carbon loading into lakes, or CO2 flux to the
• Assessing the residence/turnover time of carbon in freshwater systems
• Identifying the fate of terrestrial carbon in a freshwater system: buried
in sediments, released downstream to the sea or expelled as a gas to the
• Measurement methods in sediments and water.
Tracing carbon pathways in freshwater food webs