scholarly journals Water vapor isotopes indicating rapid shift among multiple moisture sources for the 2018–2019 winter extreme precipitation events in southeastern China

2022 ◽  
Vol 26 (1) ◽  
pp. 117-127
Author(s):  
Tao Xu ◽  
Hongxi Pang ◽  
Zhaojun Zhan ◽  
Wangbin Zhang ◽  
Huiwen Guo ◽  
...  
Keyword(s):  
Water Vapor ◽  
South China ◽  
Extreme Precipitation ◽  
Southeastern China ◽  
China Sea ◽  
Moisture Source ◽  
Moisture Sources ◽  
Source Regions ◽  
Extreme Precipitation Events ◽  
Precipitation Events

Abstract. In the East Asian monsoon region, winter extreme precipitation events occasionally occur and bring great social and economic losses. From December 2018 to February 2019, southeastern China experienced a record-breaking number of extreme precipitation events. In this study, we analyzed the variation in water vapor isotopes and their controlling factors during the extreme precipitation events in Nanjing, southeastern China. The results show that the variations in water vapor isotopes are closely linked to the change in moisture sources. Using a water vapor d-excess-weighted trajectory model, we identified the following five most important moisture source regions: South China, the East China Sea, the South China Sea, the Bay of Bengal, and continental regions (northwestern China and Mongolia). Moreover, the variations in water vapor d excess during a precipitation event reflect rapid shifts in the moisture source regions. These results indicate that rapid shifts among multiple moisture sources are important conditions for sustaining wintertime extreme precipitation events over extended periods.

scholarly journals Water vapor isotopes indicating rapid shift among multiple moisture sources for the 2018/2019 winter extreme precipitation events in Southeast China

2021 ◽  
Author(s):  
Tao Xu ◽  
Hongxi Pang ◽  
Zhaojun Zhan ◽  
Wangbin Zhang ◽  
Huiwen Guo ◽  
...  
Keyword(s):  
Water Vapor ◽  
South China ◽  
Extreme Precipitation ◽  
Southeast China ◽  
China Sea ◽  
Moisture Source ◽  
Moisture Sources ◽  
Source Regions ◽  
Extreme Precipitation Events ◽  
Precipitation Events

Abstract. In the East Asian monsoon region, winter extreme precipitation events occasionally occur and bring great social and economic losses. From December 2018 to February 2019, Southeast China experienced a record-breaking number of extreme precipitation events. In this study, we analyzed the variation of water vapor isotopes and their controlling factors during the extreme precipitation events in Nanjing, Southeast China. The results show that the variations of water vapor isotopes are closely linked to the change of moisture sources. Using a water vapor d-excess weighted trajectory model, we identified five most important moisture source regions: South China, East China Sea, South China Sea, Bay of Bengal, and Continental regions (Northwest China and Mongolia). Moreover, the variations of water vapor d-excess during a precipitation event reflect rapid shifts of moisture source regions. These results indicate that rapid shifts among multiple moisture sources are important conditions for sustaining wintertime extreme precipitation events over extended periods.

scholarly journals Moisture Sources for Wintertime Extreme Precipitation Events Over South China During 1979–2013

2018 ◽  
Vol 123 (13) ◽  
pp. 6690-6712 ◽  
Author(s):  
Wenyu Huang ◽  
Xinsheng He ◽  
Zifan Yang ◽  
Tianpei Qiu ◽  
Jonathon S. Wright ◽  
...  
Keyword(s):  
South China ◽  
Extreme Precipitation ◽  
Moisture Sources ◽  
Extreme Precipitation Events ◽  
Precipitation Events

scholarly journals Features of Extreme Precipitation at Progress Station, Antarctica

2018 ◽  
Vol 31 (22) ◽  
pp. 9087-9105 ◽  
Author(s):  
Lejiang Yu ◽  
Qinghua Yang ◽  
Timo Vihma ◽  
Svetlana Jagovkina ◽  
Jiping Liu ◽  
...  
Keyword(s):  
Water Vapor ◽  
Extreme Precipitation ◽  
Dynamic Processes ◽  
Annual Number ◽  
Positive Trend ◽  
Self Organizing Maps ◽  
Dipole Structure ◽  
Extreme Precipitation Events ◽  
Daily Precipitation Data ◽  
Precipitation Events

Observed daily precipitation data were used to investigate the characteristics of precipitation at Antarctic Progress Station and synoptic patterns associated with extreme precipitation events during the period 2003–16. The annual precipitation, annual number of extreme precipitation events, and amount of precipitation during the extreme events have positive trends. The distribution of precipitation at Progress Station is heavily skewed with a long tail of extreme dry days and a high peak of extreme wet days. The synoptic pattern associated with extreme precipitation events is a dipole structure of negative and positive height anomalies to the west and east of Progress Station, respectively, resulting in water vapor advection to the station. For the first time, we apply self-organizing maps (SOMs) to examine thermodynamic and dynamic perspectives of trends in the frequency of occurrence of Antarctic extreme precipitation events. The changes in thermodynamic (noncirculation) processes explain 80% of the trend, followed by the changes in the interaction between thermodynamic and dynamic processes, which account for nearly 25% of the trend. The changes in dynamic processes make a negative (less than 5%) contribution to the trend. The positive trend in total column water vapor over the Southern Ocean explains the change of thermodynamic term.

Persistent Spring Shortwave Cloud Radiative Effect and the Associated Circulations over Southeastern China

2019 ◽  
Vol 32 (11) ◽  
pp. 3069-3087 ◽  
Author(s):  
Jiandong Li ◽  
Wei-Chyung Wang ◽  
Jiangyu Mao ◽  
Ziqian Wang ◽  
Gang Zeng ◽  
...  
Keyword(s):  
Water Vapor ◽  
Tibetan Plateau ◽  
South China Sea ◽  
South China ◽  
Water Vapor Transport ◽  
Radiation Balance ◽  
Radiative Effect ◽  
Southeastern China ◽  
China Sea ◽  
Cloud Radiative Effect

Abstract Clouds strongly modulate regional radiation balance and their evolution is profoundly influenced by circulations. This study uses 2001–16 satellite and reanalysis data together with regional model simulations to investigate the spring shortwave cloud radiative effect (SWCRE) and the associated circulations over southeastern China (SEC). Strong SWCRE, up to −110 W m−2, persists throughout springtime in this region and its spring mean is the largest among the same latitudes of the Northern Hemisphere. SWCRE exhibits pronounced subseasonal variation and is closely associated with persistent regional ascending motion and moisture convergence, which favor large amounts of cloud liquid water and resultant strong SWCRE. Around pentad 12 (late February), SWCRE abruptly increases and afterward remains stable between 22° and 32°N. The thermal and dynamic effects of Tibetan Plateau and westerly jet provide appropriate settings for the maintenance of ascending motion, while water vapor, as cloud water supply, stably comes from the southern flank of the Tibetan Plateau and South China Sea. During pentads 25–36 (early May to late June), SWCRE is further enhanced by the increased water vapor transport caused by the march of East Asian monsoon systems, particularly after the onset of the South China Sea monsoon. After pentad 36, these circulations quickly weaken and the SWCRE decreases accordingly. Individual years with spring strong and weak rainfall are chosen to highlight the importance of the strength of the ascending motion. The simulation broadly reproduced the observed results, although biases exist. Finally, the model biases in SWCRE–circulation associations are discussed.

scholarly journals Interannual variation in moisture sources for the first rainy season in South China estimated by the FLEXPART model

2021 ◽  
pp. 1-48
Author(s):  
Dongdong Peng ◽  
Tianjun Zhou ◽  
Yong Sun ◽  
Ailan Lin
Keyword(s):  
South China Sea ◽  
South China ◽  
Bay Of Bengal ◽  
Rainy Season ◽  
Interannual Variations ◽  
China Sea ◽  
Moisture Sources ◽  
Source Regions ◽  
Before And After ◽  
Flexpart Model

Abstract The first rainy season (April-May-June) of South China includes the phases before and after the onset of South China Sea Summer Monsoon (hereafter SCSSM). Abundant moisture supply is the key dynamic process for precipitation formation. Thus, we employ the FLEXPART model to explore the corresponding moisture sources for the two phases. Before the onset of SCSSM, land regions contribute more moisture to the precipitation over South China than the ocean sources. The main source regions are Southeastern Asia (27.01%), South China Sea (25.96%), South China (11.12), and southern part of northwestern Pacific (10.23%). Land sources (66.87%) play a more important role than ocean sources (33.13%) in the interannual variations, with the contributions mainly from Southeastern Asia (47.56%) and South China Sea (28.79%). After the onset of SCSSM, the climatological contribution of ocean sources is larger than that of land regions, and the main source regions are South China Sea (20.78%), Southeastern Asia (17.51%), Bay of Bengal (13.76%), and South China (11.21%). For the interannual variations, the contributions of land sources and ocean regions are comparable, and mainly from Southeastern Asia (33.53%) and the Bay of Bengal (32.26%). The moisture transports for the interannual variations in FRS precipitation over South China before and after the onset of SCSSM are significantly correlated with the east-west contrast of sea surface temperature anomalies over northern part of North Pacific and the uniform warming over Indian Ocean, respectively. This study provides important guidance in improving the regional precipitation predictions and understanding the water resources changes.

A possible mechanism for the occurrence of wintertime extreme precipitation events over South China

2018 ◽  
Vol 52 (3-4) ◽  
pp. 2367-2384 ◽  
Author(s):  
Wenyu Huang ◽  
Zifan Yang ◽  
Xinsheng He ◽  
Daiyu Lin ◽  
Bin Wang ◽  
...  
Keyword(s):  
South China ◽  
Extreme Precipitation ◽  
Extreme Precipitation Events ◽  
Precipitation Events

scholarly journals Changes in daily extreme precipitation events in South China from 1961 to 2011

2014 ◽  
Vol 25 (1) ◽  
pp. 58-68 ◽  
Author(s):  
Zhengguo Ren ◽  
Mingjun Zhang ◽  
Shengjie Wang ◽  
Fang Qiang ◽  
Xiaofan Zhu ◽  
...  
Keyword(s):  
South China ◽  
Extreme Precipitation ◽  
Extreme Precipitation Events ◽  
Precipitation Events

scholarly journals Intensified Moisture Sources of Heavy Precipitation Events Contributed to Interannual Trend in Precipitation Over the Three-Rivers-Headwater Region in China

2021 ◽  
Vol 9 ◽  
Author(s):  
Ruiyu Zhao ◽  
Bin Chen ◽  
Xiangde Xu
Keyword(s):  
Water Vapor ◽  
Heavy Precipitation ◽  
Water Vapor Transport ◽  
Boreal Summer ◽  
Precipitation Trend ◽  
Moisture Source ◽  
Moisture Sources ◽  
Increasing Trend ◽  
Three Rivers ◽  
Precipitation Events

Evidence has indicated an overall wetting trend over the Three-Rivers Headwater Region (TRHR) in the recent decades, whereas the possible mechanisms for this change remain unclear. Detecting the main moisture source regions of the water vapor and its increasing trend over this region could help understand the long-term precipitation change. Based on the gauge-based precipitation observation analysis, we find that the heavy precipitation events act as the main contributor to the interannual increasing trend of summer precipitation over the TRHR. A Lagrangian moisture tracking methodology is then utilized to identify the main moisture source of water vapor over the target region for the boreal summer period of 1980–2017, with focus particularly on exploring its change associated with the interannual trend of precipitation. On an average, the moisture sources for the target regions cover vast regions, including the west and northwest of the Tibetan Plateau by the westerlies, the southwest by the Indian summer monsoon, and the adjacent regions associated with the local recycling. However, the increased interannual precipitation trend over the TRHR could be largely attributed to the enhanced moisture sources from the neighboring northeastern areas of the targeted region, particularly associated with the heavy precipitation events. The increased water vapor transport from the neighboring areas of the TRHR potentially related to the enhanced local hydrological recycling over these regions plays a first leading role in the recent precipitation increase over the TRHR.

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