Article
Geography, Physical
Honghao Niu, Mengzhen Li, Laurent Marquer, Teija Alenius, Frank M. Chambers, Dorothy Sack, Guizai Gao, Jiangyong Wang, Meng Meng, Linlin Liu, Lina Song, Anyi Xu, Dongmei Jie
Summary: Studying the interactions between paleoecology and climate variations in semi-arid areas, such as the Songnen grasslands in northeastern China, provides insights into how future vegetation changes and hydrological variations may impact semi-arid ecosystems. This study presents a high resolution palaeoecological dataset covering the past 7300 years and reveals the dynamics of vegetation and water levels in the Dabusu peatlands. By comparing these features with regional climate change, the study suggests that East Asian Summer Monsoon circulations might be the main driving force controlling the regional paleovegetation dynamics and hydrological variations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Qin Wen, Mi Yan, Zhengyu Liu, Jian Liu
Summary: In this study, sensitivity experiments were conducted in a climate model to investigate the impacts of insolation changes on the East Asian winter monsoon and Australian summer monsoon during the early and middle Holocene. The results showed that the East Asian winter monsoon is enhanced due to local insolation changes, while the Australian summer monsoon is enhanced due to remote forcing from both the Northern Hemisphere low latitude and Southern Hemisphere high latitude.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Qian Liu, Guixing Chen
Summary: The study reveals that the East Asian winter monsoon undergoes spatial variations in the low-level East Asian stream, with evident zonal shifts between two channels over land and coast, influenced by changes in the strength of cold airmass streams from Siberia or Bering Sea, associated with phase changes in upper-tropospheric atmospheric teleconnections. At both interdecadal and interannual timescales, atmospheric teleconnections like the North Atlantic Oscillation and Pacific/North American teleconnection play significant roles in modulating the zonal shift and width change of the East Asian stream.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Geography, Physical
Jing Wu, Wei-he Ren, Qiao-yu Cui, Yu-zhen Ma, Laurent Marquer, Hong-wei Meng, Ze-yang Zhu, Guo-qiang Chu, Jia-qi Liu
Summary: The East Asian winter monsoon system is an active component of global winter atmospheric circulation, having a major impact on the Eurasian climate in winter. By using the northern boundary of temperate pine forest as a proxy indicator for EAWM intensity, the expansion of temperate pine forest has been linked to a weakening of the EAWM.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Yonaton Goldsmith, Hai Xu, Adi Torfstein, Jianghu Lan, Yunping Song, Jin Zhang, Kang'en Zhou, Jun Cheng, Yehouda Enzel
Summary: Rain-belt migration, particularly monsoon migration, is a key aspect of climate change that is not well understood. This study presents new lake-level records and compilation data from closed-basin lakes in East Asia and India, indicating that approximately 6,000 years ago, there was a significant southward contraction of the Indo-East Asian monsoon systems, resulting in a drastic reduction in water availability in the region.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Xiaosen Zhang, Jianbao Liu, Kathleen M. Ruhland, Xin Jia, Jane M. Reed, Yanling Li, Zhongwei Shen, Jiaju Zhao, Jie Chen, Haipeng Wang, Xin Wang, John P. Smol, Fahu Chen
Summary: Through the study of high-resolution lake sediment records from northern China, it is found that the rise of the Earth's crust has led to significant changes in lake temperatures, which corresponds to the increase in mid-Holocene warm-season temperatures in China. Combined with reliable pollen-inferred precipitation data from northern China, it can be independently verified that the East Asian thermal and summer monsoon reached their maxima synchronously during the mid-Holocene, indicating that the interaction between heat and temperature is the most probable mechanism for the East Asian summer monsoon throughout the Holocene.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geosciences, Multidisciplinary
Jiapeng Miao, Dabang Jiang
Summary: The study found that internal variability, particularly the Atlantic Multidecadal Oscillation, plays a dominant role in multidecadal variations in East Asian surface air temperature since 1880. External forcings also have an impact on temperature changes, but mainly due to offsetting effects between different forcing agents.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Wogu Zhong, Zhiwei Wu
Summary: The subseasonal strength reversal of the East Asian winter monsoon (EAWM) is a leading mode of its month-to-month variation, characterized by a weaker EAWM in early winter and a stronger EAWM in late winter. This study identifies the influences of the November Baffin Bay sea ice concentration anomaly and the central-eastern North America temperature anomaly on the SR-EAWM.
Article
Geography, Physical
Jiang Dong, Anchun Li, Zhengyao Lu, Xiting Liu, Shiming Wan, Hong Yan, Zhaojie Yu, Xuguang Feng, Xuefa Shi
Summary: The study reveals an anti-phase coupling between the East Asian winter monsoon (EAWM) and El Nino (EN) on a millennial timescale since 5.8 ka, with the intensified EAWM potentially reducing equatorial western Pacific precipitation and favoring the formation of subsequent intensive EN activities. This interaction has implications for understanding millennial-scale climate oscillations and may represent periodic atmospheric exchange between high- and low-latitude climate systems by mediating the EAWM.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geography, Physical
Kevin L. Garas, Tsuyoshi Watanabe, Atsuko Yamazaki
Summary: Through the study of ancient corals from Kikai Island in Southern Japan, the seasonal variability of the East Asian Monsoon and its impact on sea surface temperature, sea surface salinity, and rainfall were investigated.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geography, Physical
Ara Cho, Jaesoo Lim, Youngeun Kim, Ung San Ahn
Summary: Understanding the natural variability of the East Asian monsoon system is crucial for predicting future climate changes. This study evaluated changes in climate based on diatom variations in Jeju Island and suggested that historically, high-latitude climate change controlled the East Asian winter monsoon.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Chi -Hua Wu, Chein-Jung Shiu, Yi-Ying Chen, I-Chun Tsai, Shih-Yu Lee
Summary: In this study, the authors investigated the climatic changes in the East Asian winter monsoon circulation and assessed the impact of global warming on these changes. The research focused on the interannual fluctuation in the upper-level westerly jet stream and its relationship with the underlying monsoon circulation. Evaluating the changes in the relationships among various circulation patterns in the context of present and future global warming may help identify the natural and anthropogenic effects on monsoon dynamics.
ATMOSPHERIC RESEARCH
(2023)
Article
Geography, Physical
Xiaohao Wen, Matt W. Telfer, Baosheng Li, Wei Wang, Tim Daley, Chen Wang, Mengyuan Tian, Mingkun Qiu
Summary: This paper examines the sediment characteristics of the Salawusu River Valley in north central China, specifically focusing on the Holocene Dagouwan Formation. It finds that the sediment features in the region are influenced by monsoonal activity and have undergone different geological processes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Jian Shi
Summary: The relationship between ENSO and the East Asian winter monsoon (EAWM) is complex and influenced by the Pacific decadal oscillation (PDO) and Atlantic multidecadal oscillation (AMO). These two oscillations modulate different aspects of the decadal relationship between ENSO and EAWM, helping to clarify discrepancies among previous studies based on specific and regional EAWM indices.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Zhenqing Zhang, Qiang Yao, Qinghai Xu, Ming Jiang, Tingchun Zhu
Summary: The study shows that the wetland evolution in the Sanjiang Plain has been significantly influenced by the East Asian summer monsoon circulation. A transition from a shallow-water lake to a wetland occurred around 4.5 ka BP, coinciding with a decline in the strength of the monsoon. The wetland development over the past 4.5 ka BP has been closely linked to variations in the East Asian summer monsoon.
Article
Environmental Sciences
Z. Xue, C. A. Wilson, K. H. Xu, S. J. Bentley, H. Liu
Summary: The study provides the first assessment of the characteristics and rate of sediment infilling in the South Pelto dredge pit on Ship Shoal in Louisiana. Sedimentation rate varied seasonally from 0.02 to 0.15 cm/day, with sediments likely sourced from the Atchafalaya and Mississippi River plumes as well as ambient inner continental shelf and proximal bays. Restoring quality sand on Ship Shoal is not renewable, with infilling rate and material slower and finer than previously predicted.
ESTUARIES AND COASTS
(2022)
Article
Geosciences, Multidisciplinary
Yi Tang, Shiming Wan, Peter D. Clift, Debo Zhao, Zhaokai Xu, Jin Zhang, Zehua Song, Hualong Jin, Mengjun Li, Xuefa Shi, Anchun Li
Summary: This study reveals the evolution of the westerlies using eolian deposition records in the North Pacific. The results show that the westerlies have shifted northward since 23 Ma and remained relatively stable since 9 Ma. The uplift of the Tibetan Plateau is believed to be the main driver of the poleward shift of the westerlies.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Zhaojie Yu, Christophe Colin, David J. Wilson, Germain Bayon, Zehua Song, Sophie Sepulcre, Arnaud Dapoigny, Yuanlong Li, Shiming Wan
Summary: This study provides new evidence for the relationship between ocean circulation and monsoon systems over orbital to sub-millennial timescales. The results indicate that Indian Summer Monsoon weakening coincided with enhanced northward Antarctic Intermediate Water (AAIW) advection during the last deglaciation, while the Early Holocene was characterized by enhanced monsoon strength but persistently strong AAIW inflow. These findings indicate asynchronous changes in the global atmosphere-ocean-climate system.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Wei Wang, Christophe Colin, Zhaokai Xu, Dhongil Lim, Shiming Wan, Tiegang Li
Summary: The Eocene period was characterized by global plate reorganization and a transition from a warm climate to a cool climate. The sedimentary history in the Southern Ocean during this period is important for understanding the environmental changes caused by the separation of Australia and Antarctica and global cooling. This study presents a detailed record of sediment from the Mentelle Basin off southwestern Australia, revealing the provenance and paleoenvironmental evolution during the Eocene. The results show that sediments mainly originated from southwestern Australia and the Naturaliste Plateau. Provenance variations indicate increased volcanic materials from the Naturaliste Plateau due to the separation of Australia and Antarctica. Changes in sediment provenance during the middle Eocene were mainly driven by paleoclimate changes rather than tectonic processes. Warm reversal in the southern latitudes lasting for 5 million years during the Eocene provides an exception to the short-lived hyperthermals observed throughout this period. The late Eocene was characterized by tectonic processes leading to rapid detritus accumulation and a shift in sediment provenance.
GLOBAL AND PLANETARY CHANGE
(2022)
Editorial Material
Geosciences, Multidisciplinary
Yibo Yang, Junsheng Nie, Yunfa Miao, Shiming Wan, Tara N. Jonell
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Zhaojie Yu, Xiaojie Tang, Christophe Colin, David J. Wilson, Xinquan Zhou, Lina Song, Fengming Chang, Shuai Zhang, Franck Bassinot, Shiming Wan
Summary: This study presents sub-millennial clay mineralogy and elemental records from the Indo-Pacific Warm Pool (IPWP) to investigate the past changes and spatial heterogeneity of precipitation within the IPWP. It reveals millennial-scale fluctuations in precipitation, with lower precipitation during Heinrich Stadials 1-4 corresponding to El Nino-like conditions, and higher precipitation during warm interstadials accompanied by La Nina-like conditions. The study also supports the hypothesis of a stronger-than-modern Walker circulation during the Last Glacial Maximum and highlights the dominant influences of the ENSO-like system and the migration of the Intertropical Convergence Zone on precipitation within the IPWP.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Marine
Nazanin Chaichitehrani, Chunyan Li, Kehui Xu, Erin L. Hestir, Mohammad Nabi Allahdadi
Summary: A coupled Flow-Wave-Sediment model was used to study the hydrodynamics, sedimentation, and bottom boundary layer dynamics over the Sandy Point Dredge Pit (SPDP) in the northern Gulf of Mexico. The presence of SPDP decreased surface current speed while its effect on wave characteristics was minor. Sediments from the Mississippi River contributed significantly to the sedimentation over the SPDP.
Article
Soil Science
Yadav Sapkota, Kehui Xu, Kanchan Maiti, Patrick Inglett, John R. R. White
Summary: The Mississippi River Deltaic Plain is experiencing significant wetland and soil organic matter loss due to high relative sea level rise, limited sediment supply, and marsh edge erosion. This study aimed to understand the rates of soil organic matter accumulation over the past 1000 years in eroding coastal wetlands. Soil cores were collected from four sites in Barataria Basin, LA and analyzed for various properties. The results showed the need for considering deeper soil profiles to estimate carbon stocks in deltaic environments. The study also revealed the impact of long-term and short-term accumulation rates on wetland elevation and the potential limitation of carbon sequestration in the absence of restoration efforts.
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
(2023)
Article
Geography, Physical
Mengjun Li, Shiming Wan, Christophe Colin, Hualong Jin, Debo Zhao, Wenqiang Pei, Wenjun Jiao, Yi Tang, Yang Tan, Xuefa Shi, Anchun Li
Summary: By reconstructing the long-term evolution of terrestrial C3-C4 plants biomass in South China since the late Eocene, this study reveals the stepwise expansions of C4 plants and identifies the drying and enhanced seasonality of precipitation as the driving forces for ecological evolution in South China during the early Miocene.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geosciences, Multidisciplinary
Weibo Lai, Xiting Liu, Jiwei Tian, Houjie Wang, Jin Zhang, Jie Huang, Shiming Wan
Summary: This study analyzed sediment samples from the southern slope of the Mariana Trench and found that the mineral composition of the trench sediments mainly includes quartz, feldspar, mica, pyrite, apatite, and clay minerals. During the Last Glacial Maximum, increased input of volcanic matter led to changes in mineral composition and the formation of laminated diatom mats, indicating the sensitivity of trench sediment mineralogy to paleoclimate and paleoceanography.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geography, Physical
Wenqiang Pei, Shiming Wan, Peter D. Clift, Guanqiang Cai, Debo Zhao, Jin Zhang, Wenjun Jiao, Mengshan Ju, Zehua Song, Anchun Li
Summary: Recent studies have shown widespread anthropogenic impacts on weathering processes during the late Holocene, but the specific mechanism linking enhanced chemical weathering to human activity remains unclear. This study provides a comprehensive analysis of sediment provenance, chemical weathering, vegetation type, and evidence of human activity in the Pearl River estuary over the past 7,000 years to investigate the interactions between weathering, climate, and human activity. The results indicate a significant increase in chemical weathering intensity since approximately 3,000 years ago, which cannot be explained by natural factors such as changes in provenance or climate but is strongly correlated with increased human activity. The study also highlights the importance of farming-related biogeochemical effects in intensifying chemical weathering processes.
QUATERNARY SCIENCE REVIEWS
(2023)
News Item
Multidisciplinary Sciences
Shilun Yang, Tjeerd J. Bouma, Kehui Xu, Benwei Shi, Haifei Yang, Wenxiang Zhang, Xiangxin Luo, Peng Li, Yuanguang Huang, Min Tian, Leicheng Guo, Zhijun Dai
Article
Green & Sustainable Science & Technology
Douglas A. A. Edmonds, Stephan C. C. Toby, Christopher G. G. Siverd, Robert Twilley, Samuel J. J. Bentley, Scott Hagen, Kehui Xu
Summary: Land loss in the Mississippi River Delta is caused by human activities that alter sediment budget, including dam building, levee construction, and subsurface resource extraction. A numerical model analysis reveals that the installation of flood-protection levees and the extraction of subsurface resources have been the primary drivers of land loss in the Barataria Basin within the delta. Additionally, the impact of dams on sediment supply reduction may not be as detrimental to sediment diversions and coastal restoration as previously thought.
NATURE SUSTAINABILITY
(2023)
Article
Environmental Sciences
Debo Zhao, Zhengyao Lu, Shiming Wan, Hai Cheng, Xuefa Shi, Anchun Li
Summary: By combining rainfall proxy records with multi-model simulations, this study identifies dominant 23 ka rainfall cycle in northern China and 100 ka rainfall cycle in southern China and Southeast Asia. It is proposed that rainfall in the north is primarily driven by insolation, while rainfall in the south is largely forced by high-latitude ice sheets. This study provides new insights into the Asian hydroclimate conditions associated with high-low-latitude climate interactions.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Wenjun Jiao, Shiming Wan, Yong-Xiang Li, Debo Zhao, Chang Liu, Hualong Jin, Mengjun Li, Zhaojie Yu, Jin Zhang, Wenqiang Pei, Anchun Li
Summary: This study presents new magnetic proxy records from sediment samples in the northern South China Sea, providing insights into the evolution of the summer monsoon in southern China during the Eocene-Oligocene transition. The results indicate a weakening of the East Asian summer monsoon during this period, which was related to global cooling rather than tectonic processes. Prior to this transition, the summer monsoon intensified, likely driven by the enhancement of the Atlantic Meridional Overturning Circulation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
