NDLI: Trends in precipitation over the low latitude highlands of Yunnan, China

Content Provider	Springer Nature Link
Author	Fan, Hui Hu, Jinming He, Daming
Copyright Year	2013
Abstract	The precipitation regime of the low latitude highlands of Yunnan in Southwest China is subject to the interactions between the East Asian Summer Monsoon and the Indian Summer Monsoon, and the influence of surface orography. An understanding of changes in its spatial and temporal patterns is urgently needed for climate change projection, hydrological impact modelling, and regional and downstream water resources management. Using daily precipitation records of the low latitude highlands over the last several decades (1950s–2007), a time series of precipitation indices, including annual precipitation, number of rainy days, mean annual precipitation intensity, the dates of the onset of the rainy season, degree and period of precipitation seasonal concentration, the highest 1-day, 3-day and 7-day precipitation, and precipitation amount and number of rainy days for precipitation above different intensities (such as ⩾10 mm, ⩾25 mm and ⩾50 mm of daily precipitation), was constructed. The Trend-Free Pre-Whitening Mann-Kendall trend test was then used to detect trends of the time series data. The results show that there is no significant trend in annual precipitation and strong seasonal differentiation of precipitation trends across the low latitude highlands. Springs and winters are getting wetter and summers are getting drier. Autumns are getting drier in the east and wetter in the west. As a consequence, the seasonality of precipitation is weakening slightly. The beginning of the rainy season and the period of the highest precipitation tend to be earlier. In the meantime, the low latitude highlands has also witnessed less rainy days, more intense precipitation, slightly longer moderate and heavy precipitation events, and more frequent extreme precipitation events. Additionally, regional differentiation of precipitation trends is remarkable. These variations may be associated with weakening of the East Asian summer monsoon and strengthening of the South Asian summer monsoon, as well as the “corridor-barrier” effects of special mountainous terrain. However, the physical mechanisms involved still need to be uncovered in the future.
Starting Page	1107
Ending Page	1122
Page Count	16
File Format	PDF
ISSN	1009637X
Journal	Journal of Geographical Sciences
Volume Number	23
Issue Number	6
e-ISSN	18619568
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-10-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	change trend Trend-Free Pre-Whitening Mann-Kendall daily precipitation spatial pattern low-latitude highlands Physical Geography Nature Conservation Geographical Information Systems/Cartography Remote Sensing/Photogrammetry
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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