Article
Meteorology & Atmospheric Sciences
Luke Osburn, Pandora Hope, Andrew Dowdy
Summary: This study analyzed hourly precipitation data from eight high-quality gauges in Victoria, Australia from 1958 to 2014 to understand changes in extreme precipitation events. It found a significant increase in the intensity and frequency of extreme precipitation events, particularly during the warm season. The study also highlighted implications for improved planning and resilience against intense rainfall and associated hazards like flash flooding in Australia.
WEATHER AND CLIMATE EXTREMES
(2021)
Article
Geosciences, Multidisciplinary
Jinxia Zhang, Shanshan Wang, Jianping Huang, Yongli He, Yu Ren
Summary: The amount, frequency, and intensity of extreme precipitation in Xinjiang have increased dramatically due to the wetting trend in Northwest China. The long-term trends in the precipitation-recycling process have been largely unexplored. A study using a dynamic recycling model and MERRA2 reanalysis found that the mean recycling ratio for extreme precipitation in Xinjiang is 42.3% with a growth rate of 2.3% per decade during 1982-2019. The increasing trend of extreme precipitation is almost equally attributed to increased recycling precipitation (49%) and external precipitation (51%). The Tianshan Mountains region and Kunlun Mountains region in Xinjiang exhibit variations in the water cycle, with the external cycle predominating the increased extreme precipitation in the Tianshan Mountains region and the recycling process mainly influencing the increase in the Kunlun Mountains region due to enhanced evapotranspiration.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Mohammad Javad Zare Sakhvidi, Jun Yang, Danial Mohammadi, Hussein FallahZadeh, Amirhooshang Mehrparvar, Mark Stevenson, Xavier Basagana, Antonio Gasparrini, Payam Dadvand
Summary: Extreme temperatures can affect the risk of traffic crashes, particularly motorcycle crashes. Exposure to extremely cold and hot temperatures increases the risk of seeking medical attention for motorcycle crashes, especially within 0 to 3 days after exposure. The study estimates that approximately 11.01% of motorcycle crash medical attendances are attributable to non-optimal temperatures.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Lu Liu, Baochen Yang, Xiaoling Jiang, Yali Luo, Fuming Ren
Summary: This study analyzes the spatiotemporal distributions and climate trends of tropical cyclone-induced extreme hourly precipitation in China from 1975 to 2018. The results show that high-EXHP TCs contribute more to the total precipitation in eastern and northeastern China, while low-EXHP TCs have a greater contribution in southern and southwestern China. Despite the decreasing trend in the frequency of EXHP-producing TCs, the total frequency of TC-induced EXHP in China shows a significant increasing trend, mainly due to high-EXHP TCs. The study also explores the mechanisms behind these differences in TC groups.
JOURNAL OF CLIMATE
(2022)
Article
Environmental Sciences
Hefei Huang, Huijuan Cui, Vijay P. Singh
Summary: This study analyzed daily precipitation data from 649 meteorological stations in China and identified 33-35 extreme precipitation zones. The study found that long-duration extreme precipitation exhibits a more pronounced regional consistency in distribution.
Article
Environmental Sciences
Xiangmin Li, Taihua Wang, Ziyi Zhou, Jiaping Su, Dawen Yang
Summary: Based on long-term observations, a peak structure exists in the relationship between precipitation and temperature in most regions of China. The scaling rate decreases spatially from southeast to northwest in the wet season, while sub-C-C scaling dominates most regions in the dry season. Mixing precipitation events from different seasons could result in miscalculations of the precipitation-temperature scaling rate. The significant increases in high percentiles of precipitation in southern regions of China during the historical period indicate that the peak structure does not imply an upper limit for precipitation extremes. Our results highlight the importance of considering seasonal characteristics when analyzing the extreme precipitation-temperature relationship in a changing climate.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Siqi Zhang, Guoyu Ren, Yuyu Ren, Suonam KealdrupTysa
Summary: The study finds that atmospheric factors and local anthropogenic factors play important roles in the observed regional changes in extreme temperatures. The changes in extreme temperatures in winter and summer are closely related to the variations in sunshine duration and water vapor pressure. Additionally, cloud cover also has an important impact on the extreme temperature changes. Urbanization has a significant influence on temperature changes, particularly on the diurnal temperature range.
ATMOSPHERIC RESEARCH
(2022)
Article
Engineering, Civil
Lilan Zhang, Xiaohong Chen, Rouyi Lai, Zhihua Zhu
Summary: This study systematically evaluated the performance of four gridded precipitation datasets in mainland China and found that all the products perform better in low-latitude areas and worse in high-latitude mountainous regions. Satellite-based precipitation estimations and reanalysis precipitation estimations have their own advantages and disadvantages, with satellite estimations performing better in summer and reanalysis estimations performing better in winter. The poorer performance of reanalysis precipitation is mainly due to false precipitation.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Hebatallah Mohamed Abdelmoaty, Simon Michael Papalexiou, Chandra Rupa Rajulapati, Amir AghaKouchak
Summary: This study evaluates the performance of CMIP6 models in reproducing the statistical properties of observed annual maxima of daily precipitation using various methods. The results indicate good matching in terms of frequency and magnitude of extremes, but biases exist in terms of mean and variation, with some models performing well.
Article
Environmental Sciences
Yilin Yan, Hao Wang, Guoping Li, Jin Xia, Fei Ge, Qiangyu Zeng, Xinyue Ren, Linyin Tan
Summary: This study reveals that China has experienced frequent extreme precipitation events in recent years, and predicts that the future trends of these events will continue to increase. By utilizing multiple evaluation metrics and machine learning techniques, better results have been obtained compared to traditional methods.
Article
Meteorology & Atmospheric Sciences
Qiaohong Sun, Xuebin Zhang, Francis Zwiers, Seth Westra, Lisa Alexander
Summary: This paper provides an updated analysis of observed changes in extreme precipitation using high-quality station data up to 2018. The study finds that extreme precipitation has increased at about two-thirds of stations, and there are statistically significant connections between extreme precipitation and temperature. The detectability of extreme precipitation intensification has increased over time, likely due to the use of longer records.
JOURNAL OF CLIMATE
(2021)
Article
Meteorology & Atmospheric Sciences
Amal John, Herve Douville, Aurelien Ribes, Pascal Yiou
Summary: Projected changes in precipitation extremes and their uncertainties are evaluated using an ensemble of global climate models. Results show a robust enhancement of extreme precipitation with most models simulating an increase, although the model spread is overestimated. The study advocates for using multiple single model initial condition ensembles in future projections to better estimate the response of extreme events.
WEATHER AND CLIMATE EXTREMES
(2022)
Article
Environmental Sciences
Liangyi Wang, Xihui Gu, Louise J. Slater, Yangchen Lai, Yanhui Zheng, Jie Gong, Moctar Dembele, Fatih Tosunoglu, Jianyu Liu, Xiang Zhang, Dongdong Kong, Jianfeng Li
Summary: This study analyzes the extreme precipitation events in central and eastern China in 2021 and their relationship with anthropogenic climate change. The findings suggest that global warming may have little impact on such events in central China, but could have a significant impact on events in eastern China. However, there may be no detectable contribution of global warming to the changes in occurrence probability of similar precipitation events in the future.
Article
Geosciences, Multidisciplinary
Ziming Chen, Tianjun Zhou, Xiaolong Chen, Wenxia Zhang, Meng Zuo, Wenmin Man, Yun Qian
Summary: Reliable regional temperature projections, including heat extremes, are essential for climate change adaptation and mitigation. Researchers have developed an emergent constraint framework to obtain constrained temperature warming over China. The results show that the constrained model is more reliable and reduces about half of the uncertainty compared to raw projections. The impact of extreme heat on China is lower than previously predicted.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Martin Hoerling, Lesley Smith, Xiao-Wei Quan, Jon Eischeid, Joseph Barsugli, Henry F. Diaz
Summary: The observed trends in annual maximum 1-day precipitation in the United States over the past century show significant regional differences, with increases in the East and decreases in the West, contrary to the overall observed increases in precipitable water. The study found that climate change drivers have different impacts on RX1day events across the United States, with intensity increases in the East but little change in the West. The lack of appreciable RX1day signals in the West is likely due to dynamical effects of climate change forcing, whereas the significant increases in the East are more likely a result of a combination of internal atmospheric processes and moderate climate change signals.
JOURNAL OF CLIMATE
(2021)
Article
Meteorology & Atmospheric Sciences
Yangruixue Chen, Bo Liu, Yali Luo, Cristian Martinez-Villalobos, Guoyu Ren, Yongjie Huang, Sihan Zhang, Yong Sun, Zhongshi Zhang
Summary: The study used HYSPLIT to analyze changes in moisture sources and paths for precipitation over Henan Province in North China associated with tropical cyclones in the western North Pacific from 1979 to 2021. During active tropical cyclone periods, moisture transport from the southeast was enhanced, while transport from the southwest was reduced. Contributions from the Pacific Ocean, eastern China, and the local area were significantly increased, while contributions from the Indian Ocean, southwestern China, Eurasia, and the South China Sea were significantly reduced.
JOURNAL OF CLIMATE
(2023)
Article
Geosciences, Multidisciplinary
Ruyuan Lee, Lei Chen, Guoyu Ren
Summary: Reconstruction of East Asia landfall tropical cyclones (TCs) was compared with observations based on different reanalysis datasets. The 20th-century reanalysis version 3 dataset (20CRv3) received the most approval for its better performance in terms of annual frequency. ERA5 and JRA55 were also recommended, but an inconsistency in reconstructed TCs before and after 1980 was observed. The study showed that ERA5 and ERA20C captured the downward trend of landfalling TCs and reduced the underestimation of TC track discrepancy in the post-satellite era.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Jintao Zhang, Qinglong You, Guoyu Ren, Safi Ullah
Summary: This study quantified the future changes in human-perceived heatwaves in eastern China based on climate projections and a human thermal comfort index. The results showed that under 3.0 degrees C of global warming, the frequency, duration, and magnitude of human-perceived heatwaves in eastern China would increase significantly. Human-perceived heatwaves are projected to increase more rapidly than heatwaves based solely on temperature, suggesting a potential underestimation of heat risks in previous studies.
ATMOSPHERIC RESEARCH
(2023)
Article
Environmental Sciences
Xiaodan Zhang, Guoyu Ren, He Bing, Takehiko Mikami, Jun Matsumoto, Panfeng Zhang, Guowei Yang
Summary: Based on the analysis of historical records and precipitation data, this study reconstructs the drought and flood grades in the Hanjiang River Basin from 1426-2017 and examines their spatial and temporal variation characteristics. The results reveal two dry periods and one wet period on the centennial scale, with regional differences in droughts and floods. The study also identifies quasi-cycles of drought and flood variability in different parts of the river basin.
Article
Thermodynamics
Fanchao Meng, Lei Zhang, Guoyu Ren, Ruixue Zhang
Summary: This study investigates the impacts of urban heat island (UHI) on building cooling demand during heatwave (HW) periods in megacities. The results show that the UHI significantly increases the cooling load of buildings during HWs, with a greater impact on office buildings than residential buildings. The study highlights the importance of considering UHI effects in building design and energy saving regulations to reduce energy consumption and carbon emissions in similar megacities.
Article
Environmental Sciences
Fanchao Meng, He Huang, Jun Guo, Guoyu Ren, Jialin Zhang
Summary: This study analyzed the spatio-temporal characteristics of extreme cold events (ECEs) in Tianjin Binhai New Area, China, from 1978 to 2020. The results showed a slight upward trend in annual extreme minimum temperature. ECEs were most frequent in autumn and least frequent in summer. The findings provide a basis for decision-making and mitigating the negative impacts of ECEs.
POLISH JOURNAL OF ENVIRONMENTAL STUDIES
(2023)
Article
Meteorology & Atmospheric Sciences
Siqi Zhang, Guoyu Ren, Xiang Zheng, Jiajun He, Xiubao Sun, Yuyu Ren, Xiaoying Xue, Guowei Yang
Summary: This study analyzed meteorological records from 10 cities in the Yangtze River Basin from 1901 to 2020 and found that the anomalies of annual mean temperature showed a significant upward trend, especially in the last 40 years. Most stations observed a slight decrease before 1961, whereas they experienced a significant increase in the last 60 years. The extreme temperature indices also showed significant trends as well as clear periodic variability.
WEATHER AND CLIMATE EXTREMES
(2023)
Article
Environmental Sciences
Guoyu Ren, Yunjian Zhan, Yuyu Ren, Kangmin Wen, Yingxian Zhang, Xiubao Sun, Panfeng Zhang, Xiang Zheng, Yun Qin, Siqi Zhang, Jiajun He
Summary: Asia, with a population of 4.7 billion, is the largest continent in the world and attracts significant attention for its climate change. However, there is a lack of observational studies on long-term climate change in Asia as a whole. This study analyzed the trends of surface air temperature and precipitation in Asia and China from 1901 to 2020 using updated and homogenized observational data. The results showed a significant increase in annual mean surface air temperature in both Asia and China, while annual precipitation in China did not undergo significant change.
Article
Environmental Sciences
Siqi Zhang, Guoyu Ren, Yunjian Zhan, Cunjie Zhang, Yuyu Ren
Summary: In order to understand the long-term change and variability of extreme precipitation in the Yangtze River Basin and its response to global climate warming, this study analyzed precipitation patterns over the past 120 years. The results show that while the Upper Reaches experienced a decrease in total annual precipitation and daily precipitation intensity, the Middle and Lower Reaches exhibited an upward trend. Overall, precipitation amount and intensity increased, while the number of precipitation days slightly decreased over the entire basin. Additionally, the study found that the observed changes in extreme precipitation events were influenced by urbanization around the stations and the East Asian monsoon.
Article
Environmental Sciences
Xiubao Sun, Guoyu Ren, Yuyu Ren, Wei Lin, Panfeng Zhang, Siqi Zhang, Xiaoying Xue
Summary: Land surface air temperature in Asia has been increasing significantly since the 1950s, with a higher warming rate compared to the global and Northern Hemisphere cases. The warming in Asia is characterized by a greater increase in minimum temperature as compared to maximum temperature, resulting in a decline in diurnal temperature range. The warming trend in Asia exhibits a spatial pattern with a gradual increase in warming from low to high latitudes.
Article
Environmental Sciences
Kangmin Wen, Guoyu Ren, Yuyu Ren, Lijuan Cao, Yun Qin, Panfeng Zhang, Jiajun He, Xiaoying Xue, Xiubao Sun
Summary: Based on the analysis of meteorological observations in China, it is found that the long-term surface climate warming in the Chinese mainland is still uncertain. The study reveals that the average, maximum, and minimum temperatures in China have been increasing, while the diurnal temperature range has been decreasing.
Article
Environmental Sciences
Fanchao Meng, Guoyu Ren, Ruixue Zhang
Summary: The heating and cooling energy consumption of urban buildings in the Beijing-Tianjin-Hebei urban agglomeration is influenced by the urban heat island (UHI) effect, but there is insufficient research on this impact. By studying three cities of varied sizes in the region, it was found that as the UHI intensity increased, the heating load difference between urban and rural areas decreased, while the cooling load difference increased. During peak energy load periods, the contribution of the UHI to residential building loads varied among the cities. Differentiated energy supplies for heating and cooling are necessary in different sized cities.
Article
Meteorology & Atmospheric Sciences
Xiaodan Zhang, Guoyu Ren, Takehiko Mikami, Jun Matsumoto, Guowei Yang
Summary: Using historical data, this study analyzed the co-drought probabilities between the water source and receiving areas of the South-to-North Water Diversion project. The results showed a relatively high possibility of co-drought occurrence at different time scales. Furthermore, severe droughts in one area were often accompanied by droughts in the other area.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Studies
Yanlin Mao, Guoyu Ren, Suonam Kealdrup Tysa
Summary: Increasing evidence shows that rapid urbanization affects precipitation and atmospheric instability in urban areas, mainly due to urban heat island and urban building-induced dynamic effects. This study focuses on the impact of urbanization on diurnal variations of rainfall in terms of initiating time, frequency, amount, and intensity. Results from a meteorological observation network in the Wuhan area, China, indicate that urban areas experience higher frequency and concentration of rainfall during nighttime and afternoon compared to rural areas. Moreover, stronger short-duration rainfall events occur in urban areas, particularly during nighttime, with an increase in urban heat island intensity.