HR: 17:30h
AN: PP54A-07 INVITED [Abstracts]
TI: Investigating the "divergence problem" with stable carbon isotopes from tree rings.
AU: * Gagen, M
EM: m.h.gagen@swansea.ac.uk
AF: Swansea University, Department of Geography,
Singleton Park, Swansea, SA2 8PP, United Kingdom
AU: McCarroll, D
EM: d.mccarroll@Swansea.ac.uk
AF: Swansea University, Department of Geography,
Singleton Park, Swansea, SA2 8PP, United Kingdom
AU: Loader, N
EM: n.j.loader@Swansea.ac.uk
AF: Swansea University, Department of Geography,
Singleton Park, Swansea, SA2 8PP, United Kingdom
AU: Robertson, I
EM: i.robertsonj@Swansea.ac.uk
AF: Swansea University, Department of Geography,
Singleton Park, Swansea, SA2 8PP, United Kingdom
AU: Young, G
EM: 205077@swansea.ac.uk
AF: Swansea University, Department of Geography,
Singleton Park, Swansea, SA2 8PP, United Kingdom
AU: Jalkanen, R
EM: risto.jalkanen@metla.fi
AF: METLA, Rovaniemen tutkimusyksikkö - Rovaniemi Research Unit, PL 16 - POBox 16, Rovaniemi, FI-96301, Finland
AU: Kirchhefer, A
EM: Andreas.Kirchhefer@ib.uit.no
AF: University of Tromsø, Department of Biology, Tromsø, NO-9037, Norway
AU: Levanic, T
EM: TOM.LEVANIC@GOZDIS.SI
AF: SLovenian Forestry Institute, Slovenian Forestry Institute, Vecna
pot 2, SLOVENIA, Ljubljana, SI-1000, Slovenia
AB:
The trees of the northern forest have responded in an active way to the anthropogenic increase in atmospheric
carbon dioxide levels. They have reduced their stomatal conductance to the extent that the ratio of internal to
external carbon dioxide concentrations has remained near constant. The dominant effect is that trees have
increased their water use efficiency, and the level of moisture stress has therefore declined. This long-term
reduction in moisture stress may, in part at least, explain the widely observed reduction in the climate sensitivity of
tree ring width and density measurements. We test this hypothesis using stable carbon isotope, ring width and
density chronologies from temperature-sensitive sites in Europe.
UR: http://geography.swan.ac.uk/treering/
DE: 1600 GLOBAL CHANGE
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1630 Impacts of global change (1225)
DE: 1637 Regional climate change
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting