Preprints
https://doi.org/10.5194/cpd-10-3097-2014
https://doi.org/10.5194/cpd-10-3097-2014
04 Aug 2014
 | 04 Aug 2014
Status: this preprint was under review for the journal CP but the revision 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

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.

H. F. Lee, Q. Pei, D. D. Zhang, and K. P. K. Choi
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
H. F. Lee, Q. Pei, D. D. Zhang, and K. P. K. Choi
H. F. Lee, Q. Pei, D. D. Zhang, and K. P. K. Choi

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