scholarly journals Variation of precipitation concentration from 1960 to 2014 in the Middle and Lower reaches of the Yangtze River Basin, China

2016 ◽  
Vol 42 (1) ◽  
pp. 205 ◽  
Author(s):  
L. Zhao ◽  
J. M. Wang ◽  
Z. Zhao ◽  
J. Fang
Keyword(s):  
River Basin ◽  
El Niño ◽  
Rainy Season ◽  
Yangtze River ◽  
El Nino ◽  
Yangtze River Basin ◽  
Risk Governance ◽  
Positive Trend ◽  
Precipitation Concentration ◽  
The Mean

Based on the daily rainfall data of 127 stations from 1960 to 2014, this study investigated the spatial-temporal variation of PCD (precipitation-concentration degree) and PCP (precipitation-concentration period), and their possible relations with ENSO (El Niño-Southern Oscillation) in the middle and lower reaches of Yangtze River of China. Main results have indicated that, firstly, the mean PCD was generally below 0.5 across the whole study area, with the lower value located in the northeast and south. Besides, there was a positive trend of concentrated precipitation in the west part while negative in the east. Secondly, the mean PCP ranged from May to July and delayed from south to north, along with a trend of advancing rainy season in the central part. In addition, PCD had a positive relation with ONI (Oceanic Niño Index), while PCP negative. El Niño led the rainy season earlier and the precipitation more concentrated. This study could not only shed a light on the understanding of the variation of precipitation pattern, but also provide theoretical support for regional disaster risk governance and water resources management in the middle and lower Yangtze River Basin.

scholarly journals Variability of Summer Precipitation Events Associated with Tropical Cyclones over Mid-Lower Reaches of Yangtze River Basin: Role of the El Niño–Southern Oscillation

Atmosphere ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 256 ◽  
Author(s):  
Fuqiang Cao ◽  
Tao Gao ◽  
Li Dan ◽  
Lian Xie ◽  
Xiang Gong
Keyword(s):  
River Basin ◽  
El Niño ◽  
Yangtze River ◽  
El Nino ◽  
Southern Oscillation ◽  
Yangtze River Basin ◽  
El Nino Southern Oscillation ◽  
Rainfall Events ◽  
Normal Rainfall ◽  
Precipitation Events

Based on tropical cyclone (TC) track data and gridded observational rainfall data of CN05.1 during the period of 1961 to 2014, we examine the contribution of TCs on three metrics of summertime rainfall regimes and identify the connection between TC-induced precipitation events and El Niño–Southern Oscillation (ENSO) in middle–lower reaches of Yangtze River Basin (MLYRB). At the regional scale, TCs are responsible for approximately 14.4%, 12.5%, and 6.9% of rainfall events for normal, 75th, and 95th percentile precipitation cases, respectively. There is no evidence of significant long-term trends of the three type events linked with TCs, while their interdecadal variability is remarkable. Fractionally, larger proportions of TC-induced events occur along southeast coastal regions of MLYRB for normal rainfall events, and they are recorded over southwest and central-east MLYRB for 95th percentile cases. Moreover, a larger contribution of 95th percentile precipitation events to summer total rainfall is found than that for 75th percentile cases, suggesting that TCs may exert stronger impacts on the upper tail of summertime precipitation distribution across MLYRB. The TC-induced normal rainfall events tend to occur more frequency over central-west MLYRB during negative phase of ENSO in summer. However, the higher likelihood of TC-induced rainfall for three defined metrics are found over the majority of areas over MLYRB during negative ENSO phase in spring. In preceding winter, La Niña episode plays a crucial role in controlling the frequency of both normal and 75th percentile precipitation events.

scholarly journals The asymmetric response of Yangtze river basin summer rainfall to El Niño/La Niña

2018 ◽  
Vol 13 (2) ◽  
pp. 024015 ◽  
Author(s):  
Steven C Hardiman ◽  
Nick J Dunstone ◽  
Adam A Scaife ◽  
Philip E Bett ◽  
Chaofan Li ◽  
...  
Keyword(s):  
River Basin ◽  
El Niño ◽  
Yangtze River ◽  
El Nino ◽  
Yangtze River Basin ◽  
Summer Rainfall ◽  
La Niña ◽  
La Nina ◽  
Asymmetric Response

Northwest Pacific Anticyclonic Anomalies during Post–El Niño Summers Determined by the Pace of El Niño Decay

2019 ◽  
Vol 32 (12) ◽  
pp. 3487-3503 ◽  
Author(s):  
Wenping Jiang ◽  
Gang Huang ◽  
Ping Huang ◽  
Renguang Wu ◽  
Kaiming Hu ◽  
...  
Keyword(s):  
Rossby Wave ◽  
El Niño ◽  
Yangtze River ◽  
El Nino ◽  
Yangtze River Basin ◽  
Northwest Pacific ◽  
The Yangtze River ◽  
Kelvin Wave ◽  
The Yangtze River Basin ◽  
Sst Anomalies

Abstract This study investigates the characteristics and maintaining mechanisms of the anomalous northwest Pacific anticyclone (NWPAC) following different El Niño decaying paces. In fast decaying El Niño summers, the positive SST anomalies in the tropical central-eastern Pacific (TCEP) have transformed to negative, and positive SST anomalies appear around the Maritime Continent (MC), whereas in slow decaying El Niño summers, positive SST anomalies are present in the TCEP and in the tropical Indian Ocean (TIO). During fast decaying El Niño summers, the cold Rossby wave in response to the negative TCEP SST anomalies has a primary contribution to maintaining the NWPAC anomalies. The warm Kelvin wave response and enhanced Hadley circulation anomalies forced by the positive MC SST anomalies also facilitate developing the NWPAC anomalies. During slow decaying El Niño summers, the warm Kelvin wave anchored over the TIO plays a crucial role in sustaining the NWPAC anomalies, while the warm Rossby wave triggered by the positive TCEP SST anomalies weakens the western part of the NWPAC anomalies. The southwesterly anomalies of the NWPAC anomalies during fast decaying El Niño summers can reach to higher latitudes than those during slow decaying El Niño summers. Correspondingly, positive rainfall anomalies appear in northern China and the Yangtze River basin in fast decaying El Niño summers but are only distributed in the Yangtze River basin in slow decaying El Niño summers. This study implies that the El Niño decaying pace is a key factor in East Asian summer climate.

scholarly journals Extending seasonal predictability of Yangtze River summer floods

2018 ◽  
Author(s):  
Shanshan Wang ◽  
Xing Yuan
Keyword(s):  
El Niño ◽  
Yangtze River ◽  
El Nino ◽  
Yangtze River Basin ◽  
Summer Precipitation ◽  
Moisture Flux ◽  
Atmospheric Moisture ◽  
Potential Predictability ◽  
Strongly Connected ◽  
Flooding Events

Abstract. Extreme pluvial floods across China's Yangtze River basin in the summer of 2016 was strongly connected with intense atmospheric moisture transport, and resulted in vast loss of properties after a strong El Niño winter. Predicting such extreme floods in advance is essential for hazard mitigation, but the flood forecast skill is relatively low due to the limited predictability of summer precipitation. By using a perfect model assumption, here we show that atmospheric moisture flux has a higher potential predictability than precipitation over the Yangtze River at seasonal time scales. The predictability of precipitation and moisture are higher in post-El Niño summers than those in post-La Niñas, especially for flooding events. As compared with extreme precipitation, the potential detectability of extreme moisture increases by 20 % in post-El Niño summers, which suggests that atmospheric moisture could be crucial for early warning of Yangtze River summer floods.

scholarly journals ENSO Influence on Rainy Season Precipitation over the Yangtze River Basin

Water ◽  
2017 ◽  
Vol 9 (7) ◽  
pp. 469 ◽  
Author(s):  
Qing Cao ◽  
Zhenchun Hao ◽  
Feifei Yuan ◽  
Zhenkuan Su ◽  
Ronny Berndtsson
Keyword(s):  
River Basin ◽  
Rainy Season ◽  
Yangtze River ◽  
Yangtze River Basin ◽  
The Yangtze River ◽  
The Yangtze River Basin

scholarly journals Detection and attribution of reference evapotranspiration change (1951–2020) in the Upper Yangtze River Basin of China

2021 ◽  
Author(s):  
Manlin Wang ◽  
Yu Zhang ◽  
Yan Lu ◽  
Xulong Gong ◽  
Li Gao
Keyword(s):  
River Basin ◽  
Yangtze River ◽  
Reference Evapotranspiration ◽  
Sunshine Duration ◽  
Yangtze River Basin ◽  
Dominant Effect ◽  
Detection And Attribution ◽  
Upper Yangtze River ◽  
The Mean ◽  
The Upper Yangtze River

Abstract Reference evapotranspiration (ET0) indicates atmospheric evaporating capability over a hypothetical reference surface. ET0 is an important hydrological and meteorological variable to reflect climate change. This is particularly true for the Upper Yangtze River Basin (UYRB), which is vulnerable and sensitive to changing environment. This study aims to provide a newer and longer description of ET0 change and the causes at basin and subbasin scales in the UYRB. Based on the observed data from 1951 to 2020, ET0 in the entire UYRB and subbasins is estimated using the Penman–Montieth method with local calibration. The spatial–temporal characteristics in ET0 change are identified from time-series analysis. Our results show that ET0 increases significantly by 3.3 mm/year in the entire UYRB. Stations with significant increases in annual ET0 are concentrated in the central part of the UYRB, where the mean annual ET0 is low. We further propose an improved method to assess the causes of ET0 change. Our results suggest that the relative humidity decrease has the most dominant effect, causing 4.69 mm/year of ET0 increase. Temperature increase tends to cause 1.26 mm/year of ET0 increase. Sunshine duration decrease and wind speed decrease contribute to 1.96 and 0.48 mm/year of ET0 decrease.

scholarly journals Extending seasonal predictability of Yangtze River summer floods

2018 ◽  
Vol 22 (8) ◽  
pp. 4201-4211 ◽  
Author(s):  
Shanshan Wang ◽  
Xing Yuan
Keyword(s):  
El Niño ◽  
Yangtze River ◽  
El Nino ◽  
Yangtze River Basin ◽  
Summer Precipitation ◽  
Moisture Flux ◽  
Atmospheric Moisture ◽  
Potential Predictability ◽  
Strongly Connected ◽  
Flooding Events

Abstract. Extreme pluvial floods across China's Yangtze River basin in the summer of 2016 were strongly connected with intense atmospheric moisture transport, and resulted in vast loss of properties after a strong El Niño winter. Predicting such extreme floods in advance is essential for hazard mitigation, but the flood forecast skill is relatively low due to the limited predictability of summer precipitation. By using a “perfect model” assumption, here we show that atmospheric moisture flux has a higher potential predictability than precipitation over the Yangtze River at seasonal timescales. The predictability of precipitation and moisture flux is higher in post-El Niño summers than in post-La Niñas, especially for flooding events. As compared with extreme precipitation, the potential detectability of extreme moisture flux increases by 20 % in post-El Niño summers, which suggests that atmospheric moisture flux could be crucial for early warning of Yangtze River summer floods.

Sign in / Sign up

Export Citation Format

Share Document