Article
Oceanography
D. G. Babb, R. J. Galley, S. Kirillov, J. C. Landy, S. E. L. Howell, J. C. Stroeve, W. Meier, J. K. Ehn, D. G. Barber
Summary: The loss of multiyear sea ice in the Arctic Ocean has occurred primarily through two stepwise reductions: in 1989 and in 2006-2008. The first reduction was due to high export of multiyear ice, while the second reduction was a result of both high export and melt, as well as limited replenishment of multiyear ice. Although currently stable, reduced retention of older multiyear ice has led to a younger and thinner multiyear ice pack, potentially setting the stage for another reduction.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Richard Davy, Philipp Griewank
Summary: Evidence from gridded observations and climate reanalysis show that Arctic amplification peaked in the early 2000s, coinciding with the maximum loss of sea ice area, thickness, and volume. Based on CMIP6 projections and the CESM2 large ensemble, it is unlikely that Arctic amplification will be as high again in the 21st century, except under the lowest emissions scenarios where global temperatures stabilize while the Arctic continues to warm.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
J. Harper, J. Saito, N. Humphrey
Summary: High rainfall on the Greenland Ice Sheet is changing the thermal and structural composition of the surface layer. A 4-day cold-season warm/rain event caused significant changes in the firn column, with rapid warming and refreezing of liquid water. It took up to 8 weeks for the heat fluxes and water refreezing to return to normal, impacting the evolution and runoff characteristics of the ice sheet.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
L. C. Hahn, K. C. Armour, D. S. Battisti, A. Donohoe, R. Fajber
Summary: Arctic warming is influenced by both winter CO2 peaks and summer forcing through seasonal ocean heat storage. Winter dry heat transport reduction is driven by Arctic sea-ice loss and warming, while summer moist heat transport increase is driven by sub-Arctic warming and moistening. Intermodel spread in Arctic warming controls the spread in seasonal poleward heat transport.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Mika Rantanen, Alexey Yu Karpechko, Antti Lipponen, Kalle Nordling, Otto Hyvarinen, Kimmo Ruosteenoja, Timo Vihma, Ari Laaksonen
Summary: Analyses of observations and climate simulations suggest that Arctic Amplification has been stronger than expected and underestimated in climate models. The warming in the Arctic has been nearly four times faster than the global average over the past 43 years, which is a higher ratio than previously reported. This finding indicates the urgency and severity of Arctic warming.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Gaelle F. Gilson, Hester Jiskoot, Soukeyna Gueye, John H. van Boxel
Summary: This study presents a comprehensive climatology of coastal fog along the East Greenland coast. Results indicate that the fog in the warm season is mainly advection fog, while in the cold season, it is primarily mixed-phase fog.
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
(2023)
Article
Meteorology & Atmospheric Sciences
Caiyan Kang, Qigang Wu, Yonghong Yao, Yibing Chen, Xing Chen, Steven R. Schroeder
Summary: This study investigates the impact of Arctic sea ice loss on the Eastern Hemisphere westerly wind and finds that the weakening of the winter westerly wind is strongly correlated with sea ice anomalies in the Barents-Kara Seas. Arctic sea ice loss in winter contributes to Arctic warming and weakens the winter polar front jet, while in summer, the strengthening of the polar front jet is mainly controlled by greenhouse gases and sea surface temperature changes outside the Arctic.
Article
Meteorology & Atmospheric Sciences
Amy Solomon, Celine Heuze, Benjamin Rabe, Sheldon Bacon, Laurent Bertino, Patrick Heimbach, Jun Inoue, Doroteaciro Iovino, Ruth Mottram, Xiangdong Zhang, Yevgeny Aksenov, Ronan McAdam, An Nguyen, Roshin P. Raj, Han Tang
Summary: The Arctic climate system is undergoing rapid changes, leading to ecosystem changes in the Arctic Ocean. Variability of Arctic freshwater plays a critical role in the Arctic and global climate systems by impacting ocean stratification and sea ice formation or melt. The trend in Arctic freshwater content has stabilized in the 2010s compared to the 2000s, potentially due to increased compensation between different regions of the Arctic Ocean.
Article
Geochemistry & Geophysics
Shuai Gao, Kang Yang, Yao Lu, Xin Lu, Manchun Li
Summary: This study proposes a method using supraglacial rivers to match multitemporal images and measure ice flow velocities. By integrating image information and GIS operations, the summer and annual ice flow velocities can be accurately calculated and validated with other ice flow velocity products, demonstrating the high accuracy of this method.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Letter
Geosciences, Multidisciplinary
N. Jullien, A. J. Tedstone, H. Machguth, N. B. Karlsson, V. Helm
Summary: We analyzed airborne accumulation radar data from 2002 to 2018 to investigate changes in the extent and thickness of ice slabs in Greenland. It was found that ice slabs several meters thick were already present before 2002. Between 2012 and 2018, the ice slabs expanded inland by 13,400-17,600 km(2), or 37%-44%. The study also demonstrated that the extremely warm summer of 2012 led to the formation of near-surface ice layers at higher elevations, enabling the development of ice slabs with only moderate melting in subsequent summers.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Stephanie Hay, Matthew D. K. Priestley, Hao Yu, Jennifer L. Catto, James A. Screen
Summary: Using simulations from the Polar Amplification Model Intercomparison Project and a Lagrangian objective feature tracking algorithm, researchers found that extratropical cyclones shift equatorward and eastward, become weaker and slower, and there are fewer of them in the winter due to sea-ice loss. These changes are greatest in the Arctic but still significant in midlatitudes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Isabel J. Nias, Sophie Nowicki, Denis Felikson, Bryant Loomis
Summary: Mass loss from the Greenland Ice Sheet is a combination of surface mass balance and discharge due to ice dynamics. Perturbations to glacier termini result in immediate velocity and mass loss, as well as a diffusive response over time due to ice thickness evolution. Modeling the committed response of the ice sheet can provide estimates of its contribution to future sea level rise.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Environmental Sciences
Shaoyin Wang, Jiping Liu, Xinyu Li, Yufang Ye, Richard J. Greatbatch, Zhuoqi Chen, Xiao Cheng
Summary: The Greenland high has a significant influence on Greenland ice sheet melting and summer Arctic sea ice. In this study, it is found that an intensified Greenland high in early summer leads to a decline in sea ice concentration and thickness over the Beaufort Sea. This decline is primarily due to thermodynamic and mechanical redistribution processes. The intensified Greenland high increases subsidence over the Canadian Basin and easterly wind frequency over the Beaufort Sea, pushing the sea ice away from the coastlines and resulting in increased open water areas.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Meng Yang, Yubao Qiu, Lin Huang, Maoce Cheng, Jianguo Chen, Bin Cheng, Zhengxin Jiang
Summary: With global warming, the decrease in sea ice creates favorable conditions for Arctic activities. The study examines the temporal and spatial characteristics of sea surface temperature (SST) and sea ice concentration (SIC) in the Arctic above 60 degrees N and their relationship. It also calculates the melting and freezing time of sea ice. The results show variations in SST and SIC trends across different sea areas, with a significant negative correlation between Arctic SST and SIC. The study provides valuable information for predicting Arctic shipping and sea ice.
Article
Meteorology & Atmospheric Sciences
Fei Zheng, Ji-Ping Liu, Xiang-Hui Fang, Mi-Rong Song, Chao-Yuan Yang, Yuan Yuan, Ke-Xin Li, Ji Wang, Jiang Zhu
Summary: This study explores the physical factors that can improve the accuracy of seasonal climate predictions and identifies the key factors for predicting the 2020/21 La Nina phenomenon and Arctic sea ice loss.
ADVANCES IN ATMOSPHERIC SCIENCES
(2022)
Article
Meteorology & Atmospheric Sciences
Shiyan Zhang, Yongyun Hu, Jiping Liu
Summary: This study investigates the inter-model spreads of the climatological annual mean Hadley circulation in a set of 37 models. The results reveal significant differences in the simulation of the Hadley circulation among these models, even though they are driven by the same sea surface temperatures. The findings suggest that the discrepancies are mainly attributed to the cloud-convection parameterization schemes used in the models. Improvements in the cloud-convection parameterizations are crucial for simulating the Hadley circulation.
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)
Article
Multidisciplinary Sciences
Jing Han, Ji Nie, Yongyun Hu, William R. Boos, Yonggang Liu, Jun Yang, Shuai Yuan, Xiang Li, Jiaqi Guo, Jiawenjing Lan, Qifan Lin, Xiujuan Bao, Mengyu Wei, Zhibo Li, Kai Man, Zihan Yin
Summary: In this study, the migration of the intertropical convergence zone (ITCZ) in the past 540 million years was investigated using climate simulations. The results showed that continental configuration plays a major role in ITCZ migrations through two competing pathways: hemispheric radiation asymmetry and cross-equatorial ocean heat transport. The findings help to understand the influence of continental evolution on global ocean-atmosphere circulations.
Article
Geosciences, Multidisciplinary
Xiang Li, Yongyun Hu, Jun Yang, Mengyu Wei, Jiaqi Guo, Jiawenjing Lan, Qifan Lin, Shuai Yuan, Jian Zhang, Qiang Wei, Yonggang Liu, Ji Nie, Yan Xia, Shineng Hu
Summary: We simulated climate variations in the past 250 million years using the fully coupled Community Earth System Model. The results showed that greenhouse gases were the major driver in regulating global mean surface temperature variations, contributing up to 12.2 degrees C.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Editorial Material
Multidisciplinary Sciences
Yongyun Hu
CHINESE SCIENCE BULLETIN-CHINESE
(2023)
Article
Geochemistry & Geophysics
Ren Wei, Mingsong Li, Rui Zhang, Yongyun Hu, James G. Ogg, Guoyong Liu, He Huang, Xiangwu He, Shuai Yuan, Qifan Lin, Zhijun Jin
Summary: This study provides evidence for the involvement of continental aquifers in the global water cycle during icehouse episodes at the million-year scale. The analysis of lacustrine sedimentary sequences and paleoclimate simulations reveals the influence of groundwater aquifers on long-period obliquity cycles and sea-level fluctuations during the late Paleozoic ice age.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Ren Wei, Zhijun Jin, Rui Zhang, Mingsong Li, Yongyun Hu, Xiangwu He, Shuai Yuan
Summary: This study investigates the impact of orbital forcing on the global water cycle during the late Paleozoic ice age, revealing the importance of eccentricity in sea-level oscillations and its dominant role in climate changes and global hydrological cycles. The findings are based on analyses of coastal sedimentary records and paleoclimate simulations.
EARTH AND PLANETARY SCIENCE 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)