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Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cpd-10-3097-2014
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
04 Aug 2014
Review status
This discussion paper has been under review for the journal Climate of the Past (CP). The revised manuscript was not accepted.
Long-term regional precipitation disparity in northwestern China and its driving forces
H. F. Lee, Q. Pei, D. D. Zhang, and K. P. K. Choi Department of Geography and the International Centre of China Development Studies, University of Hong Kong, Hong Kong, SAR
Abstract. Subject to the unique physical setting of northwestern China (NW China), precipitation in the region is characterized by salient regional differences. Yet, the long-term regional precipitation disparity in NW China still remains insufficiently-explored. In the present study, we base on historical documentation to reconstruct the precipitation indices of two macro regions in NW China between AD580–1979 to address the following issues: (1) determine the multi-decadal to centennial regional precipitation disparity in NW China, a topic which has not been systematically examined in previous paleo-climate/paleo-environment studies; and (2) find the major driving forces behind it. Wavelet analysis, which is ideal for analyzing non-stationary systems, is applied. Our results show that there is significant regional discrepancy of precipitation change in NW China over extended period. Although there is significant association between the regional precipitation disparity in NW China and various modes of atmospheric circulation, the association is characterized by a regime shift during the transition from the Medieval Warm Period to the Little Ice Age. Most importantly, the low-frequency cycle of the El Niño–Southern Oscillation is found to be the most prominent pacemaker of regional precipitation disparity in NW China at the multi-decadal to centennial timescales. Our findings help to demonstrate which atmospheric circulation is primarily responsible for the long-term regional precipitation disparity in NW China, which may have important implications for water resource management in NW China in the near future.

Citation: Lee, H. F., Pei, Q., Zhang, D. D., and Choi, K. P. K.: Long-term regional precipitation disparity in northwestern China and its driving forces, Clim. Past Discuss., 10, 3097-3125, doi:10.5194/cpd-10-3097-2014, 2014.
H. F. Lee et al.
H. F. Lee et al.

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