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We conclude that uplift of the Tian Shan
and Altai reorganized late Neogene cli-
mate in Central Asia, establishing a prom-
inent seasonal precipitation boundary as a
result of increasing interactions between
the mid-latitude jet and high topography.
Thus, paleoclimatic changes in Central
Asia in the late Neogene may not be due
solely to changes in the extent or height of
the Tibetan Plateau. In contrast, the timing
of uplift and consequent climatic impacts
of Asia’s northern bounding ranges are
critical to unraveling the paleoenviron-
mental history of Central Asia. Ultimately,
future work to test this interpretation must
include westward/upwind records of d18O
combined with GCM studies that resolve
the impact of Tian Shan and Altai uplift
on Asian climate.
ACKNOWLEDGMENTS
We thank our field expedition members,
including B. Dautaliev, G. Nazyanbeteva,
S. Samzatbaeva, J. Buztsev, and S. Bayshashov,
and N. Ballantine, D. Moragne, and P. Blisniuk
for assistance with lab work. We also thank two
anonymous reviewers and editor G. Dickens for
comments that improved the manuscript. A GSA
Student Research grant (Caves), three Stanford
University McGee grants (Caves, Ritch, and
Ibarra), and NSF grants EAR-1009721 and EAR-
1423967 (Chamberlain) funded this work. Caves
is also funded by an NSF Graduate Research
Fellowship (DGE-1147470) and a Stanford
Graduate Fellowship.
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