READING FOR THURSDAYDavid Meko and Connie Woodhouse (2010), Application ofstreamﬂow reconstruction to water resources management.M.K. Hughes et al. (eds.), Dendroclimatology, Developments inPaleoenvironmental Research.
QUESTIONWhat was Denver Water’s key concernregarding its water supply?
QUESTIONWhat speciﬁc test did Denver Water use toassess whether or not tree rings wereskillful estimators of river ﬂow?
“ [The early 21st century drought] highlights both the extreme vulnerability of the semi-arid western United States to precipitation deﬁcits and the need to be er understand long-term drought variability ” and its causes in North America. Cook et al., 2004
“ To this end, we have used centuries-long, annually resolved tree-ring records to reconstruct annual changes in both drought and wetness over large ” portions of North America. Cook et al., 2004
Tree-ring chronologies (red dots) Cook et al., JQS, 2010
Palmer Drought Severity Index The PDSI incorporates historical records of precipitation and temperature into a water-balance model to estimate the amount of water available in the soil relative toaverage conditions and is typically produced once a month.
+4 extreme wet -4 extreme drought (compared to ‘average’ for that place)
One hundred years of drought history around Minneapolis-St. PaulSource: North American Drought Atlas
Drought grid (blue dots) Cook et al., JQS, 2010
Tree-ring records across Monsoon AsiaE R Cook et al. Science 2010;328:486-489
Tree rings show extent of ‘Great Drought’, 1876-1878E R Cook et al. Science 2010;328:486-489
Was the ‘Great Drought’ caused by ENSO or the North Pacific Ocean?E R Cook et al. Science 2010;328:486-489
“ The MADA is a crucial step forward for paleoclimate studies in a region that is of great social and climatological interest, but where the development of tree-ring archives faces immense challenges and ” instrumental data coverage is limited. Wahl and Morrill, 2010
READINGEugene Wahl and Carrie Morrill (2010), Towardunderstanding and predicting monsoon pa erns.Science 328, 437-438.
GRADUATE STUDENT READINGBüntgen et al. (2011), 2500 years of European climatevariability and human susceptibility. Science 331, 578-582.