|
|
abstracts
Multiproxy climate field reconstructions for southern South America back to AD 1000
Raphael Neukom, LOTRED-SA Consortium
LOTRED-SA (Long-Term climate REconstruction and Dynamics of southern South America) is a collaborative initiative under the umbrella of PAGES with the objective to perform high resolution multi proxy climate field reconstructions for southern South America (SSA) covering the last millennium. The locations of annually resolved natural climate archives (mainly tree rings, ice cores and varved sediments) in SSA are mostly restricted to the areas in and close to the Andes. In order to enlarge the area with sufficient predictive skill, we combine these data with time series derived from documentary evidence as well as from sites outside of SSA making use of teleconnection patterns such as the El Niño Southern Oscillation (ENSO) or the Antarctic Oscillation (AAO). We present the methods and results of optimizing this predictor network in order to explain a significant portion of SSA cold and warm season climate variability as well as to make optimal use of the low frequency information preserved in the different proxy archives. We applied three methods (PC regression, CPS and RegEM) to calculate SSA temperature and precipitation back to AD 1000 on 0.5° x 0.5° spatial resolution. The results represent the first continental scale field reconstructions of the Southern Hemisphere and provide new insights into its past climate variability and dynamics. We discuss the climatic evolution of different sub regions of SSA and name the areas where further improvements of the proxy network are most needed.
Raphael Neukom, Institute of Geography, University of Bern,Hallerstrase 12, 3012 Bern, Switzerland, neukom@giub.unibe.ch
LOTRED-SA Consortium, Past Global Changes International Project Office, Bern, Switzerland
Session: F2: Regional Climate Dynamics
Download Poster:
> PAGES_YSM09_Neukom.pdf
Download Talk:
> YSM09_OralB_Neukom.pdf
|
|
