Article
Meteorology & Atmospheric Sciences
Botao Zhou, Jin Qian, Jianwei Zhou, Tingting Han, Bo Sun
Summary: This study finds that the relationship between West China Autumn Rain (WCAR) and the Arctic Oscillation (AO) has strengthened in the mid-1980s, while it was weak in the earlier period. A strong positive phase of AO corresponds to abnormal atmospheric circulation that favors the increase of WCAR, and the change in AO structure may result in the unstable relationship between AO and atmospheric circulations.
ATMOSPHERIC RESEARCH
(2022)
Article
Environmental Sciences
Hui Shao, Yuandong Zhang, Fengxue Gu, Chunming Shi, Ning Miao, Shirong Liu
Summary: The study found that vegetation index, leaf area index, and gross primary production in southwest China experienced significant increases from 2000 to 2018. Temperature-related extreme climate indices had a greater impact on these ecosystem metrics compared to precipitation-related indices. Attention should be paid to the increasingly heavy precipitation and extreme high temperatures in the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Tao Wang, Wenshou Tian, Yufeng Lin, Xiaohua Gou, Hongwen Liu, Xuejia Wang, Fei Xie
Summary: Using multi-source observations and reanalysis data, this study reveals a significant weakening of the relationship between Arctic stratospheric ozone and North Pacific sea surface temperature since the 2000s. The study finds that the impact of stratospheric ozone on atmospheric circulation and sea surface temperature has changed over time, with a weaker influence observed in the post-2000 period compared to the pre-2000 period. The weakening of the ozone-related anomalies in the Asian region and the interference of the quasibiennial oscillation contribute to the changes in North Pacific wind patterns and sea surface temperature.
ATMOSPHERIC RESEARCH
(2023)
Article
Meteorology & Atmospheric Sciences
Ghyslaine Boschat, Ariaan Purich, Irina Rudeva, Julie Arblaster
Summary: The Southern Annular Mode (SAM) describes the annular or zonal component of large-scale atmospheric circulation in the Southern Hemisphere (SH) extratropics and affects surface climate across the SH. In addition to the dominant annular flow in austral summer, zonal wave 3 (ZW3) patterns with zonal asymmetries are evident in other seasons. This study explores the influence of both SAM and ZW3 on surface climate, finding that ZW3 modulates the impact of SAM and plays a significant role in the surface climate impacts of large-scale SH circulation states, particularly in nonsummer seasons.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Yong Liu, Shui Yu, Huopo Chen
Summary: Based on in situ observations, reanalysis, and model simulation, this study explores the variations in glaze dipole pattern in China and its underlying physical mechanism. The results show that the Pacific decadal oscillation plays an important role in the interdecadal variations of glaze dipole pattern, and the temperature difference between the south and the north of China also affects the glaze weather. Additionally, the differences in climatic conditions between the south and the north lead to the variations in glaze weather.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Hongjie Liang, Wen Zhou
Summary: Arctic summer sea ice has been declining in recent decades. This study investigates the Sea route and identifies three main modes: the LE-mode, L-mode, and E-mode. These modes exhibit different circulation patterns and cause earlier melt onset in different seas. The dominant modes have shifted over time, with the negative LE-mode dominant in the 1980s, positive LE-mode dominant in the early 1990s, and increased frequency of L-mode and E-mode since the mid-1990s.
JOURNAL OF CLIMATE
(2023)
Article
Green & Sustainable Science & Technology
Shuaifeng Song, Xiaodong Yan
Summary: This study analyzed the temporal and spatial distributions of extreme cooling events in winter in China and found that the frequency of EC events decreased over the years, with the Northeast region experiencing the highest frequency. The research also revealed a significant negative correlation between EC events and the Arctic Oscillation index in China, with AO accounting for approximately 21% of the variance in EC events. The study suggests that changes in mid-high latitude atmospheric circulation anomalies associated with the AO are responsible for EC events, providing theoretical guidance for their prediction and simulation.
Article
Meteorology & Atmospheric Sciences
Sonja Murto, Lukas Papritz, Gabriele Messori, Rodrigo Caballero, Gunilla Svensson, Heini Wernli
Summary: In recent decades, the Arctic has experienced rapid winter warming, largely due to the inflow of warm, moist air from lower latitudes. This study highlights the significance of turbulent fluxes and downward longwave radiation in determining surface energy budget anomalies over Arctic sea ice, emphasizing the need for accurate representation of these processes in climate models.
JOURNAL OF CLIMATE
(2023)
Article
Environmental Sciences
Hao-Jhe Hong, Thomas Reichler
Summary: The study investigates the impact of natural circulation variability in the winter Arctic stratosphere on stratospheric ozone distribution. It reveals that sudden warmings and vortex intensifications lead to rapid increases and gradual decreases in Arctic ozone, while final warmings are followed by a sudden warming-like increase. In the tropics, ozone changes are influenced by the quasi-biennial oscillation, with small reductions observed during sudden warmings and final warmings after controlling for this effect.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Meteorology & Atmospheric Sciences
Qiyan Lin, Jiacan Yuan
Summary: This study aims to explore the atmospheric dynamic processes leading to the concurrence of humid heat extremes, which may exacerbate the risk from heat stress in today's interconnected world. In specific regions over the Northern Hemisphere midlatitudes, durations of humid heat extremes are found to be elevated simultaneously by amplified quasi-stationary waves. We further identify the physical connections between amplified quasi-stationary waves and humid heat extremes over targeted regions. This would help in better understanding the role of changing atmospheric circulations in the humid heat extremes.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Shoudong Zhao, Minghu Ding, Wenqian Zhang, Ting Wei, Wei Cheng, Junming Chen, Cunde Xiao
Summary: Research indicates that changes in extreme temperatures have a greater impact on ecosystems and human society than changes in climate averages. The Arctic, a hotspot of global warming, has recently experienced unprecedented heatwaves, which emphasizes the need to identify long-term variations in extreme temperatures. However, spatial imbalance of observations and arbitrarily chosen investigation periods limit our understanding of extreme temperatures in the Arctic region. This study establishes a comprehensive and quality-controlled observation network for surface temperatures in the Arctic lands and combines in situ and reanalysis data to assess changes in extreme temperatures from 1979 to 2020. The results demonstrate an acceleration in the increase of extreme temperatures since the 2000s, particularly along the coast of Eurasia, and a larger magnitude of change for cold events compared to warm events.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Yijia Zhang, Zhicong Yin, Botao Zhou, Huijun Wang
Summary: This study found a close relationship between the warm Arctic-cold Eurasia (WACE) pattern in January and the weakened February haze pollution in North China. The warming signal in sea ice and the cooling signal in Eurasian soil temperatures contributed to the persistence of the WACE pattern from January to February. The combined signal of sea ice and soil temperature anomalies created an environment conducive to the dispersion of pollutants. The relationship between the WACE pattern and the cyclonic circulation anomaly could also be observed in the large-ensemble CMIP6 simulations. Furthermore, the relationship between the January WACE pattern and the reduction of February haze pollution has been prominently enhanced since the late 1990s, which corresponds to the deep Arctic warming that has emerged during that time.
JOURNAL OF CLIMATE
(2022)
Article
Geosciences, Multidisciplinary
Y. T. Eunice Lo, Dann M. Mitchell, Peter A. G. Watson, James A. Screen
Summary: Observed rapid Arctic warming and sea-ice loss are projected to continue unless greenhouse gas emissions are reduced to net-zero. This study examines the potential impacts of future sea-ice loss on winter temperature extremes across the Northern Hemisphere. The results suggest that cold extremes could become less severe at high and mid-latitudes in response to Arctic sea-ice loss, while warm extremes could become warmer at northern high latitudes but to a lesser extent than cold extremes. Additionally, the study compares the impacts of sea-ice loss to those of global sea surface temperature change and finds that the latter has a larger effect on temperature extremes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Xiaodan Chen, Aiguo Dai
Summary: Under the influence of increasing greenhouse gases, the Arctic warms at a faster rate compared to other regions, known as Arctic amplification. It is found that the impact of increased CO2 on meridional wind (upsilon) is more significant than the effect of Arctic amplification alone, especially in the northern extratropics. The changes in upsilon are associated with variations in zonal temperature gradients caused by CO2 forcing. Furthermore, the study reveals that both CO2 forcing and Arctic amplification affect the climatology of northerlies over different regions, leading to complex responses in zonal temperature gradients and upsilon.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Wenyu Zhou, L. Ruby Leung, Jian Lu
Summary: This study investigates the responses of the hydroclimate and extremes in the U.S. Midwest to global warming, and finds that future precipitation will have a seasonal variation, with increased precipitation in late spring and reduced precipitation in late summer. This leads to increased late-spring floods and intensified late-summer droughts.
JOURNAL OF CLIMATE
(2022)
Article
Environmental Sciences
Xiaofei Li, Jingning Guo, Feng Yu, Lekhendra Tripathee, Fangping Yan, Zhaofu Hu, Shaopeng Gao, Xiaobo He, Chaoliu Li, Shichang Kang
Summary: This study investigates the characteristics and roles of carbonaceous matter (CM) in the Tibetan Plateau River Basin using precipitation and glacier samples. The results show that CM significantly affects the carbon cycle and radiative forcing (RF) of glaciers. Various sources of CM were identified, and two major pollution source areas were identified as well. Moreover, the optical properties of CM varied among different sample types. The study also estimated the RF of CM relative to black carbon (BC) in different sample types.
ENVIRONMENTAL RESEARCH
(2023)
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
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
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
Y. J. Zhan, G. Y. Ren
Summary: Extreme precipitation in the monsoon region of China has significant impacts on human life and social production, and its long-term change is still unclear. This study analyzes the characteristics of extreme precipitation changes in eastern China over the past 120 years based on high-resolution data. The results show that there is no significant trend in precipitation amount and precipitation days, but there are quasi-periods and variations in extreme precipitation indices. The spatial patterns of extreme precipitation changes have also changed in different time periods.
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
Huijun Zheng, Xin Wan, Shichang Kang, Pengfei Chen, Quanlian Li, Linda Maharjan, Junming Guo
Summary: Organic aerosols have significant impacts on the Tibetan Plateau, a region highly sensitive to climate change. Studying the concentration and sources of organic molecular tracers, it was found that biomass burning plays a major role in non-monsoon seasons, with significant impacts from South Asian biomass burning in the western, southern, and southeastern regions.
ENVIRONMENTAL POLLUTION
(2024)
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
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.
Article
Environmental Sciences
Jinlei Chen, Shichang Kang, Adan Wu, Lihong Chen
Summary: The navigability of Arctic maritime passages has improved with the retreat of sea ice, but it also brings potential environmental and climate risks. This investigation studied shipping emissions and climate impacts along the Northern Sea Route under different global warming scenarios. The results show that ship energy consumption is 109 kWh under 2°C and 3°C global warming. Environmental impacts decrease with the use of clean fuel sources, and CO2 has the greatest climate impact.
ENVIRONMENTAL POLLUTION
(2024)
Article
Environmental Sciences
Wasim Sajjad, Barkat Ali, Hewen Niu, Nikhat Ilahi, Muhammad Rafiq, Ali Bahadur, Abhishek Banerjee, Shichang Kang
Summary: This study investigated the characteristics, prevalence of resistance genes, and tolerance genes in antibiotic-resistant bacteria (ARB) isolated from glacier debris and meltwater in China. The results showed that these bacteria exhibited resistance to multiple antibiotics and metals, with distinct resistance genes identified. The study also highlighted the horizontal transfer of resistance genes between different bacteria species and a strong positive correlation between antibiotic resistance genes and metals tolerance genes.
ENVIRONMENTAL RESEARCH
(2023)