Article
Geosciences, Multidisciplinary
Aaron Match, Edwin P. Gerber
Summary: In response to global warming, ozone reductions in the tropical lower stratosphere are caused by both strengthening upwelling and tropospheric expansion, making it challenging to determine their relative contributions.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Jinpeng Lu, Sijia Lou, Xin Huang, Lian Xue, Ke Ding, Tengyu Liu, Yue Ma, Wuke Wang, Aijun Ding
Summary: The HTHH eruption in January 15, 2022, was one of the most explosive volcanic events of the 21st century so far. Satellite-based measurements showed that 0.4 Tg of sulfur dioxide (SO2) was injected into the stratosphere during the eruption. The study investigates the changes in stratospheric chemical compositions one year after the eruption and examines the key processes that affect ozone (O-3) concentrations, including the oxidation of injected SO2 into sulfate and the transport of sulfate aerosols by the Brewer-Dobson circulation.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Mengchu Tao, Paul Konopka, Jonathon S. Wright, Yi Liu, Jianchun Bian, Sean M. Davis, Yue Jia, Felix Ploeger
Summary: According to satellite observations and atmospheric model simulations, stratospheric water vapor concentrations exhibit robust multidecadal variability, which is stronger in the northern hemisphere at mid-stratosphere levels.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Venugopal Veenus, Siddarth Shankar Das, Liji M. M. David
Summary: This study quantifies the changes in the intensity of Brewer-Dobson Circulation (BDC) during sudden stratospheric warming (SSW) and their impacts on the tropical stratospheric thermal structure and ozone distribution. The results show an increase in planetary wave activity and BDC intensity before the central date of SSW. Ozone anomalies are observed in different regions, with positive anomalies in the tropical upper stratosphere and negative anomalies in the tropical lower stratosphere.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Felix Ploeger, Hella Garny
Summary: This study investigates the impact of ozone recovery on the stratospheric Brewer-Dobson circulation (BDC) and finds a hemispheric asymmetry in atmospheric circulation changes, which has significant effects on chemical composition. The study reveals that although climate models predict a decrease in circulation and age-of-air trends due to ozone recovery, the hemispherically asymmetric signal is small compared to internal variability. Therefore, the observed circulation trends are not contradictory to the expectations from climate models.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Yifeng Peng, Pengfei Yu, Robert W. Portmann, Karen H. Rosenlof, Jiankai Zhang, Cheng-Cheng Liu, Jiangtao Li, Wenshou Tian
Summary: The Pinatubo eruption in 1991 released 10-20 Tg of SO2 into the stratosphere, forming sulfate aerosols. Our modeling results show that volcanic heating significantly affects the chemistry in the tropical stratosphere, including NOx and HOx catalytic cycles. The simulated ozone tendency in the tropics is positive at 20 mb and negative at 10 mb. The study finds that three months after the eruption, the ozone tendency due to homogeneous chemistry becomes more important than heterogeneous chemistry.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
M. Prignon, S. Chabrillat, M. Friedrich, D. Smale, S. E. Strahan, P. F. Bernath, M. P. Chipperfield, S. S. Dhomse, W. Feng, D. Minganti, C. Servais, E. Mahieu
Summary: Based on ground-based and satellite measurements, it is found that inorganic fluorine is accumulating less rapidly in the Southern Hemisphere than in the Northern Hemisphere over the past 20 years, which may be linked to changes in the Brewer-Dobson circulation.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Meteorology & Atmospheric Sciences
Xin Zhang, Xingying Zhang, Lihua Zhou, Xifeng Cao, Zhili Deng, Yuhan Jiang
Summary: The positive trend of tropospheric column ozone (TCO) in China has been confirmed in rapidly developing city clusters such as BTH, YRD, and PRD. This study analyzes the connection between TCO and Brewer-Dobson circulation (BDC) and Hadley circulation (HC) in these clusters. It reveals that both BDC and HC have significant causal effects on TCO variations. The intensity of BDC is the most important influencing factor for TCO changes in each region, particularly in YRD. TCO shows a significant positive trend in BTH, YRD, and PRD during 2005-2020.
ATMOSPHERIC RESEARCH
(2023)
Article
Meteorology & Atmospheric Sciences
Yetong Li, Yan Xia, Fei Xie, Yingying Yan
Summary: Surface ozone, a major air pollutant, is influenced by stratosphere-troposphere exchange (STE) which contributes to both the decrease and increase of surface ozone in the Southern and Northern Hemispheres, respectively. Additionally, global warming is expected to worsen surface ozone pollution in the future.
ATMOSPHERIC RESEARCH
(2024)
Article
Meteorology & Atmospheric Sciences
Daniele Minganti, Simon Chabrillat, Quentin Errera, Maxime Prignon, Douglas E. Kinnison, Rolando R. Garcia, Marta Abalos, Justin Alsing, Matthias Schneider, Dan Smale, Nicholas Jones, Emmanuel Mahieu
Summary: This study evaluates the trends in nitrous oxide (N2O) using two different versions of a climate model and compares them with measurements from ground-based instruments. The results highlight the discrepancies between the model and measurements, and the sensitivity tests reveal the role of stratospheric transport in driving the trends.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Environmental Sciences
Yihang Hu, Wenshou Tian, Jiankai Zhang, Tao Wang, Mian Xu
Summary: This study investigates the trends of Antarctic stratospheric planetary wave activities in early austral spring since the early 2000s using multiple reanalysis datasets and modeling simulations. The study finds that the stratospheric planetary wave activities in September have weakened significantly since the year 2000, mainly due to the weakening of the tropospheric wave sources in the extratropical Southern Hemisphere. The impact of ozone recovery and sea surface temperature on the weakening of stratospheric wave activity is also examined.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
Marie Bouillon, Sarah Safieddine, Cathy Clerbaux
Summary: Sudden Stratospheric Warming events (SSW) are extreme phenomena that have significant impacts on stratospheric temperature and ozone concentrations. This study finds that during major SSWs, temperature anomalies propagate from the upper stratosphere to the lower stratosphere, with the maximum anomaly at 200 hPa correlated to the maximum anomaly at 10 hPa. Negative temperature anomalies are observed in Europe and Russia, while positive anomalies are observed in Canada and Greenland at 750 hPa. Cold air outbreaks following major SSWs contribute to temperature anomalies as low as -15 K. Additionally, major SSWs lead to higher springtime ozone concentrations, and the ozone anomaly in March is correlated to the duration of the positive temperature anomaly at 10 hPa.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Geosciences, Multidisciplinary
Peixuan Zhang, Yuzhong Zhang, Ruosi Liang, Wei Chen, Xinchun Xie
Summary: This study quantifies the annual anomalies of stratosphere-troposphere CH4 fluxes and finds that although the STE process has a minor impact on the inter-annual variability of surface CH4 growth rates globally, it has a considerable impact in polar regions.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Mingcheng Wang, Qiang Fu, Anna Hall, Aodhan Sweeney
Summary: This study investigates the Stratosphere-Troposphere exchange (STE) of air mass and ozone using ERA5 and MERRA2 reanalyses from 1980 to 2022. The annual-mean ozone STEs in ERA5 and MERRA2 show differences, mainly attributed to diabatic heating and ozone concentration differences. Significant differences are also found in the ozone exchange during summer and autumn, mainly due to the seasonal breathing of the lowermost stratosphere ozone mass. El Niño-Southern Oscillation, quasi-biennial oscillation, and Brewer-Dobson circulation are identified as factors explaining the variability in global ozone exchange.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
John R. Albers, Amy H. Butler, Andrew O. Langford, Dillon Elsbury, Melissa L. Breeden
Summary: Research suggests that ENSO affects the amount of STT ozone in the Pacific-North American region, primarily through modulating lower stratospheric ozone and the Pacific tropospheric jet. These findings help explain the utility of ENSO as a subseasonal predictor for free-tropospheric ozone and the likelihood of stratospheric ozone intrusion events leading to surface air quality standard exceedances in the region.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Yan Xia, Fei Xie, Xiao Lu
Summary: Surface ozone in the Arctic was significantly enhanced during the 2020-2021 winter after the onset of sudden stratospheric warming (SSW). The enhanced ozone is primarily due to the strengthening of stratosphere-to-troposphere transport associated with SSW. The SSW also leads to positive anomalies in surface ozone in the northern midlatitudes, which are related to cold air outbreaks.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Haotian Zhang, Chuanfeng Zhao, Yan Xia, Yikun Yang
Summary: This study investigates the spatial distribution of ice clouds and liquid-bearing clouds over the Greenland ice sheet (GrIS) and their effects on surface radiative forcing. The results show that the spatial and temporal variations in clouds over the GrIS are closely related to the North Atlantic Oscillation (NAO). Different regions of the GrIS exhibit different responses of clouds to changes in the atmospheric circulation field during the NAO.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Fei Xie, Yan Xia, Wuhu Feng, Yingli Niu
Summary: Excessive exposure to UV radiation harms humans and ecosystems. Surface UV radiation has been increasing significantly in the tropics and Northern Hemisphere mid-latitudes from 2010-2020, due to total column ozone depletion. The decline in stratospheric ozone after 2010 may be related to increased emissions of nitrous oxide (N2O) leading to an increase in stratospheric nitrogen oxides.
ADVANCES IN ATMOSPHERIC SCIENCES
(2023)
Article
Engineering, Ocean
Ziying Yang, Jiping Liu, Chao-Yuan Yang, Yongyun Hu
Summary: This study develops single-layer and three-hidden-layer neural networks to correct the bias in sea surface temperature forecast products from the NCEP CFSv2. The results show that both neural networks can significantly reduce the bias in the Pacific and Atlantic Oceans, with the three-hidden-layer network showing better agreement with observations in certain subregions.
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
Jiawenjing Lan, Jun Yang, Yongyun Hu, Xiang Li, Jiaqi Guo, Qifan Lin, Jing Han, Jian Zhang, Shuang Wang, Ji Nie
Summary: Through using the Community Earth System Model version 1.2.2 (CESM1.2.2), it was found that the upper-tropospheric equatorial winds on ancient Earth changed to westerly flows in certain periods, forming equatorial superrotation. This phenomenon generally occurred in a warmer climate, with the tropical atmospheric circulation shifting upward in altitude, relatively stronger stationary and/or transient eddies, and relatively weaker Hadley cells, due to the changes of the three factors, especially CO2 concentration and land-sea configuration.
JOURNAL OF THE ATMOSPHERIC SCIENCES
(2023)
Article
Geography, Physical
Jian Zhang, Yongyun Hu, Chenguang Zhu, Sascha Flogel, Xiaomin Fang, Jimin Sun
Summary: This study uses the CESM 1.2.2 model to simulate the effects of global cooling and the closure of the Tethyan Seaway on the climates of North Africa and South Asia. The results show that global cooling leads to a decrease in precipitation over both regions, while the closure of the Tethyan Seaway results in a decrease in precipitation over North Africa but an increase over South Asia. The opposite effects are due to increased moisture transport from North Africa to South Asia when the Tethyan Seaway is closed. Furthermore, the study suggests that the narrowing and subsequent closure of the Tethyan Seaway contribute to the formation of the Sahara desert and the strengthening of the South Asian monsoon during the Middle Miocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Multidisciplinary Sciences
Xiujuan Bao, Yongyun Hu, Christopher R. Scotese, Xiang Li, Jiaqi Guo, Jiawenjing Lan, Qifan Lin, Shuai Yuan, Mengyu Wei, Zhibo Li, Kai Man, Zihan Yin, Jing Han, Jian Zhang, Qiang Wei, Yonggang Liu, Jun Yang, Ji Nie
Summary: Quantitative relationships between coals and evaporites with temperature and precipitation can be established from geological records and climate simulations. The study reveals that before 250 Ma, coal records indicate a median temperature of 25 degrees C and precipitation of 1300 mm yr(-1). Afterward, coal records appear with temperatures between 0 degrees C and 21 degrees C and precipitation of 900 mm yr(-1). Evaporite records were associated with a median temperature of 27 degrees C and precipitation of 800 mm yr(-1). The most remarkable finding is the constant net precipitation associated with coal and evaporite records across time.
NATIONAL SCIENCE REVIEW
(2023)
Article
Multidisciplinary Sciences
Shiyan Zhang, Yongyun Hu, Jun Yang, Xiang Li, Wanying Kang, Jian Zhang, Yonggang Liu, Ji Nie
Summary: The Hadley circulation during the Pangea era is weaker and wider than the present, and this weakening and widening is attributed to increased tropical and subtropical static stability. The poleward shifts of the winter cell's ascending branches are associated with the geographic configuration of the supercontinent Pangea.
Editorial Material
Meteorology & Atmospheric Sciences
Minghua Zhang, Yafang Cheng, Rong Fu, Filippo Giorgi, Ruby Leung, Xin-Zhong Liang, Wahid Mellouki, William Randel, Nicole Riemer, Robert Rogers, Lynn Russell, Ping Yang, Yun Qian, Yongyun Hu, Xiushu Qie
Summary: The editorial board of JGR Atmospheres expresses gratitude to the reviewers who reviewed papers in 2022.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Editorial Material
Multidisciplinary Sciences
Yongyun Hu
CHINESE SCIENCE BULLETIN-CHINESE
(2023)
Article
Geosciences, Multidisciplinary
Yan Xia, Yongyun Hu, Yi Huang, Jianchun Bian, Chuanfeng Zhao, Jintai Lin, Fei Xie, Chunjiang Zhou
Summary: Heavy summer precipitation over the southern slope of the Tibetan Plateau has significant impacts on water resources and hydrological disasters in South Asia. The trends of this precipitation have shown an increase from 1979 to 1996, followed by a decrease from 1996 to 2022, which are not well understood. This study suggests that stratospheric ozone plays a significant role in the long-term trends of summer precipitation in this region by affecting deep convection and precipitation over the southern slope of the Tibetan Plateau. It is crucial for future water resource management in South Asia to consider the potential reduction in summer precipitation due to ozone recovery.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Yongyun Hu, Xiang Li, William R. Boos, Jiaqi Guo, Jiawenjing Lan, Qifan Lin, Jing Han, Jian Zhang, Xiujuan Bao, Shuai Yuan, Qiang Wei, Yonggang Liu, Jun Yang, Ji Nie, Zhengtang Guo
Summary: This study used a large set of simulations of global climate over the past 250 million years to reveal the evolution of the monsoon system and found that global-mean temperature variations have little impact on it. The changes in the global land monsoon are primarily governed by continental area, latitudinal location, and fragmentation.
Editorial Material
Geography, Physical
Jimin Sun, Wenjiao Xiao, Brian F. Windley, Yongyun Hu
Summary: This Special Issue consists of sixteen papers that cover the interplay between tectonics and climate in Inner Asia during the Cenozoic Era. These papers provide new insights into Cenozoic tectonism, climate changes, and their possible inter-relationships, improving our understanding of the coupling between lithosphere and surface processes. The articles will be of broad interest to interdisciplinary scholars in geosciences.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jian Zhang, Sascha Floegel, Yongyun Hu, Anni Zhao, Runjian Chu, Chenguang Zhu, Chengshan Wang
Summary: The East Asian coastal mountains played a significant role in amplifying the influence of orbital forcing and solar insolation on East Asian climate during the Cretaceous period.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
Yuchen Lian, Xianyu Tan, Yongyun Hu
Summary: Observations show the existence of quasi-quadrennial oscillation (QQO) in Jupiter's equatorial stratosphere, which is caused by the downward propagation of alternating jets. A 3D general circulation model simulation suggests that injecting thermal disturbances can generate waves and result in the QQO and multiple jet streams. The evolution of potential vorticity favors the formation and migration of off-equatorial jets, which strengthen the deep equatorial jets and prolong the QQO-like oscillations.
ASTROPHYSICAL JOURNAL
(2023)
