Throughout history, drought is constant threat to societies around the world. What do proxy records tell us about the severity, extent and causes of drought during the last thousand years?
6. 100 Views of Climate Change h p://changingclimates.colostate.edu/
7. Workload
A paper, not to exceed 10 pages of text plus figures
and references, which reviews the climate history of a
single region over a specific time period during the
Holocene (e.g., the mid-Holocene, the last 2ka or the
last 500 yr).
26. 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 to average
conditions and is typically produced once a month.
51. “ The tree-ring record shows that droughts
lasting decades have routinely gripped
western North America.”
Jonathan Overpeck and Bradley Udall
52. “ As western North America currently endures its
worst drought since 1900, it is important to realize
that this drought might be nothing compared to
what is possible in the future if megadrought and
even ho er temperatures coincide.”
Jonathan Overpeck and Bradley Udall