drainage
works, and land-cover and land-use change.
Two other (sometimes indistinguishable)
challenges to stationarity have been exter-
nally forced, natural climate changes and
low-frequency, internal variability (e.g., the
Atlantic multidecadal oscillation) enhanced
by the slow dynamics of the oceans and ice
sheets (
2, 3). Planners have tools to adjust
their analyses for known human distur-
bances
/media/loftslag/Milly_etal-2008-Stationarity-dead-Science.pdf