Little Ice Age wetting of interior Asian deserts and the rise of the Mongol Empire

Aaron E. Putnam, David E. Putnam, Laia Andreu-Hayles, Edward R. Cook, Jonathan G. Palmer, Elizabeth H. Clark, Chunzeng Wang, Feng Chen, George H. Denton, Douglas P. Boyle, Scott D. Bassett, Sean D. Birkel, Javier Martin-Fernandez, Irka Hajdas, John Southon, Christopher B. Garner, Hai Cheng, Wallace S. Broecker

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32 Scopus citations


The degree to which warming of the planet will alter Asia's water resources is an important question for food, energy, and economic security. Here we present geological evidence, underpinned by radiometric dating and dendrochronology, and bolstered by hydrological modeling, indicating that wetter-than-present conditions characterized the core of the inner Asian desert belt during the Little Ice Age, the last major Northern Hemispheric cold spell of the Holocene. These wetter conditions accompanied northern mid-latitude cooling, glacier expansion, a strengthened/southward-shifted boreal jet, and weakened south Asian monsoons. We suggest that southward migration of grasslands in response to these wetter conditions aided the spread of Mongol Empire steppe pastoralists across Asian drylands. Conversely, net drying over the 20th century has led to drought that is unprecedented for the past ~830 years, and that could intensify with further heating of the Asian continent.

Original languageEnglish (US)
Pages (from-to)33-50
Number of pages18
JournalQuaternary Science Reviews
StatePublished - Jan 1 2016


  • Asian hydroclimate
  • Asian monsoon
  • C
  • Dendrochronology
  • Lop nor
  • Mountain glacier
  • Paleohydrology
  • Snowpack
  • Taklamakan desert
  • Tarim basin
  • Westerlies

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    Putnam, A. E., Putnam, D. E., Andreu-Hayles, L., Cook, E. R., Palmer, J. G., Clark, E. H., Wang, C., Chen, F., Denton, G. H., Boyle, D. P., Bassett, S. D., Birkel, S. D., Martin-Fernandez, J., Hajdas, I., Southon, J., Garner, C. B., Cheng, H., & Broecker, W. S. (2016). Little Ice Age wetting of interior Asian deserts and the rise of the Mongol Empire. Quaternary Science Reviews, 131, 33-50.