Factors favorable to frequent extreme precipitation in the upper Yangtze River Valley

2013 ◽  
Vol 121 (3-4) ◽  
pp. 189-197 ◽  
Author(s):  
Baoqiang Tian ◽  
Ke Fan
Keyword(s):  
Extreme Precipitation ◽  
Yangtze River ◽  
Yangtze River Valley ◽  
River Valley ◽  
Upper Yangtze River ◽  
The Upper Yangtze River

A New Species of Aporia (Lepidoptera: Pieridae) from Northwest Yunnan, China with Taxonomic Notes on Its Similar Sympatric Taxa

Zootaxa ◽  
2021 ◽  
Vol 4963 (1) ◽  
pp. 1-10
Author(s):  
SHAO-JI HU ◽  
HUI-HONG ZHANG ◽  
YANG YANG
Keyword(s):  
New Species ◽  
Yangtze River ◽  
Yangtze River Valley ◽  
River Valley ◽  
New Taxon ◽  
Northwest Yunnan ◽  
Upper Yangtze River ◽  
World Class ◽  
The Upper Yangtze River ◽  
A New Species

The northwest corner of Yunnan Province, China is the world-class diversity centre of the genus Aporia Hübner, 1819 (Lepidoptera: Pieridae). During our expeditions to this area in 2019 and 2020, a new species of Aporia was discovered from the upper Yangtze River valley in northwest Yunnan, China. The new taxon, A. chunhaoi sp. nov., is similar to A. lhamo (Oberthür, 1893) but can be easily identified by larger size, much paler (creamy) male hindwing, as well as different genitalic structures. Our field surveys and comparative studies also confirmed a new range of A. lhamo in the upper Yangtze River valley, and the morphological variation of this species is discussed herein.

scholarly journals Linkage between the Arctic Oscillation and summer climate extreme events over the middle reaches of Yangtze River Valley

2019 ◽  
Vol 78 (3) ◽  
pp. 237-247 ◽  
Author(s):  
L Liu ◽  
T Zhou ◽  
L Ning ◽  
J Liu ◽  
M Yan ◽  
...  
Keyword(s):  
Extreme Precipitation ◽  
Yangtze River ◽  
Arctic Oscillation ◽  
Yangtze River Valley ◽  
River Valley ◽  
Cumulative Distribution ◽  
The Arctic ◽  
Extreme Precipitation Events ◽  
The Arctic Oscillation ◽  
Precipitation Events

The Arctic Oscillation (AO) is commonly recognized as a dominant large-scale mode influencing climate over the Northern Hemisphere. Here, the influences of May AO on summer (JJA) extreme precipitation events and summer extreme warm days over the middle reaches of Yangtze River Valley for the period 1961-2014 are investigated. Following a positive May AO, there are usually fewer summer extreme precipitation events but more summer extreme warm days over the middle reaches of Yangtze River Valley. Composite analyses show that positive May AO induces the northward displacement of the East Asian jet stream and northeastward displacement of the western Pacific subtropical high (WPSH), and causes a stronger, more northwestern subtropical northwest Pacific cyclone/anticyclone anomaly, as well as an anticyclonic circulation anomaly on the north side of the South China Sea, resulting in a northward shift of the rainfall belt and an enhancement of the East Asia summer monsoon. Therefore, the cumulative distribution probability of daily precipitation values shift significantly to a lower precipitation value, indicating lower probabilities of summer extreme precipitation events following positive May AO. A weakening of WPSH induces an anomalous sinking motion over the middle reaches of the Yangtze River Valley. The 850 hPa wind field shows southerly wind anomalies over the Jiang-Huai River Basin, which cause a decrease in total cloud cover, resulting in an increase in solar radiation flux. A significant shift of the daily maximum temperature probability distribution towards to higher values indicates higher probabilities of summer extreme warm day occurrences following positive May AO. This study will provide useful insights to help improve the understanding of the dynamics and projections of future regional extreme precipitation changes over the middle reaches of Yangtze River Valley.

scholarly journals Potential Predictability of Seasonal Extreme Precipitation Accumulation in China

2017 ◽  
Vol 18 (4) ◽  
pp. 1071-1080 ◽  
Author(s):  
Wenguang Wei ◽  
Zhongwei Yan ◽  
P. D. Jones
Keyword(s):  
Extreme Precipitation ◽  
Yangtze River ◽  
Large Scale ◽  
Southern China ◽  
Yangtze River Valley ◽  
River Valley ◽  
Northwestern China ◽  
Chain Model ◽  
The Yangtze River ◽  
Potential Predictability

Abstract The potential predictability of seasonal extreme precipitation accumulation (SEPA) across mainland China is evaluated, based on daily precipitation observations during 1960–2013 at 675 stations. The potential predictability value (PPV) of SEPA is calculated for each station by decomposing the observed SEPA variance into a part associated with stochastic daily rainfall variability and another part associated with longer-time-scale climate processes. A Markov chain model is constructed for each station and a Monte Carlo simulation is applied to estimate the stochastic part of the variance. The results suggest that there are more potentially predictable regions for summer than for the other seasons, especially over southern China, the Yangtze River valley, the north China plain, and northwestern China. There are also regions of large PPVs in southern China for autumn and winter and in northwestern China for spring. The SEPA series for the regions of large PPVs are deemed not entirely stochastic, either with long-term trends (e.g., increasing trends in inland northwestern China) or significant correlation with well-known large-scale climate processes (e.g., East Asian winter monsoon for southern China in winter and El Niño for the Yangtze River valley in summer). This fact not only verifies the claim that the regions have potential predictability but also facilitates predictive studies of the regional extreme precipitation associated with large-scale climate processes.

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