Article
Environmental Sciences
Nguyen-Xuan Hau, Masaki Sano, Takeshi Nakatsuka, Shin-Hao Chen, I. -Ching Chen
Summary: The monsoon precipitation in East Asia is affected by ENSO and PDO, but the long-term relationship between them is not well understood. In this study, tree ring data from Taiwan were used to reconstruct the EASM precipitation from 1533 to 2011. It was found that PDO has consistently modulated the ENSO-EASM relationship over the past 500 years, but the modulation effects may become less predictable under warming.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Weiyi Sun, Jian Liu, Bin Wang, Deliang Chen, Lingfeng Wan, Jing Wang
Summary: This study investigates the influence of solar activity on the Asian summer monsoon (ASM) at different time scales. Simulation results suggest that solar forcing can significantly affect ASM precipitation on a 300-600-year periodicity during the middle-late Holocene. Proxy data also support this multi-centennial variation. The western North Pacific circulation system plays a key role in modulating the ASM variation, through enhancing the south Asia-WNP monsoon trough.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Seogyeong Kim, Kyung-Ja Ha
Summary: Understanding the variabilities of East Asian summer rainfall (EASR) and Western North Pacific summer rainfall (WNPSR) is essential for controlling energy and water supply. The study found that interannual variation is dominant in both indices, while decadal variation is more significant in WNPSR than in EASR. This suggests that there are differing mechanisms in adjusting rainfall during monsoon events between decadal and interannual variabilities.
Article
Meteorology & Atmospheric Sciences
Feng Shi, Hugues Goosse, Jianping Li, Qiuzhen Yin, Fredrik Charpentier Ljungqvist, Tao Lian, Cheng Sun, Lin Wang, Zhiwei Wu, Juan Li, Sen Zhao, Chenxi Xu, Wei Liu, Ting Liu, Takeshi Nakatsuka, Zhengtang Guo
Summary: This study investigates the variability of the East Asian summer monsoon (EASM) by analyzing climate data from the past millennium. The findings suggest that the Pacific-Japan teleconnection pattern is closely associated with the interdecadal to multidecadal variability of the EASM.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Geography, Physical
Fang Wang, Binggui Cai, Chuan-Chou Shen, Hai Cheng, Miaofa Li, Tingting Li, Ming Tan, R. Lawrence Edwards
Summary: By analyzing a stalagmite record from northeastern China, this study reconstructed the East Asian Summer Monsoon (EASM) and regional precipitation between 5.82 and 4.77 kyr B.P. The findings suggest synchronous variations of the EASM across monsoonal China on decadal to centennial scales, and highlight the significant role of El Niño in modulating the EASM during the mid-Holocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Multidisciplinary Sciences
Fei Liu, Chaochao Gao, Jing Chai, Alan Robock, Bin Wang, Jinbao Li, Xu Zhang, Gang Huang, Wenjie Dong
Summary: The study shows that the East Asian summer monsoon significantly intensifies in the first summer after tropical volcanic eruptions, with a higher frequency of El Ninos being a contributing factor.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Paul-Arthur Monerie, Jon Robson, Cassien D. Ndiaye, Cenyao Song, Andrew G. Turner
Summary: Monsoons have significant impacts on global population, affecting economy, agriculture, and human health. This study explores the ability of climate models to predict variations in summer monsoon precipitation. The multi-model ensemble-mean shows skill in predicting precipitation from one to 6-9 years ahead, with different levels of skill depending on the model, monsoon domain, and lead-time. The study identifies regions with better prediction performance and emphasizes the importance of simulating externally forced changes and Pacific Ocean temperatures for improved monsoon predictions.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Geography, Physical
Xingxing Liu, Hu Yang, Shugang Kang, Jef Vandenberghe, Li Ai, Zhengguo Shi, Peng Cheng, Jianghu Lan, Xulong Wang, Youbin Sun
Summary: The Younger Dryas period during the last deglaciation in the Northern Hemisphere experienced multiple rapid climate changes, with a persistent centennial-scale East Asian winter monsoon variability driven by North Atlantic sea ice variation. This variability is closely related to a northward shift of the atmospheric polar front and sea ice retreat induced by the resumption of the Atlantic meridional overturning circulation. Results suggest that the AMOC-induced sea ice change in the North Atlantic plays a dominant role in transmitting abrupt climate signals over the Northern Hemisphere.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Jing Yang, Tao Zhu, Frederic Vitart
Summary: Previous studies suggest that the intraseasonal variations along the subtropical westerly jet (SJ) in boreal summer frequently affect subseasonal variations over East Asia (EA). This study found that the prediction skills for surface air temperature (SAT) over EA are significantly higher during summer with stronger intraseasonal oscillation along the SJ. The enhanced quasi-biweekly waves and their energy dispersion along the SJ contribute to more regular quasi-biweekly variations of downstream SAT, thus increasing regional predictability.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Geography, Physical
Xingxing Liu, Hu Yang, Shugang Kang, Jef Vandenberghe, Li Ai, Zhengguo Shi, Peng Cheng, Jianghu Lan, Xulong Wang, Youbin Sun
Summary: By analyzing loess samples from the western Chinese Loess Plateau, researchers discovered centennial-scale winter monsoon variability during the Younger Dryas (YD) event. This variability, believed to be caused by variations in North Atlantic sea ice, was transmitted through fast atmospheric processes between the subpolar and mid-latitude regions. Additionally, the study found a decrease in centennial-scale winter monsoon variability during the mid-YD period, which was associated with a shift in the atmospheric polar front and sea ice retreat induced by the resumption of the Atlantic meridional overturning circulation (AMOC).
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Environmental Sciences
Chenwei Fang, Jim M. Haywood, Ju Liang, Ben T. Johnson, Ying Chen, Bin Zhu
Summary: Using the UK Earth System Model version 1 (UKESM1), this study finds that reductions in carbonaceous aerosol and SO2 emissions can significantly impact the South Asian summer monsoon and East Asian summer monsoon, leading to changes in the large-scale circulation over Asia. Reductions in carbonaceous aerosols extend and intensify the summer rainy season in South Asia and East Asia, while reductions in SO2 result in a shorter and weaker rainy season. Overall, decreasing both types of aerosol emissions enhances monsoon precipitation and 850 hPa circulation.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Yuheng Tang, Anmin Duan
Summary: The study utilizes convolutional neural networks and transfer learning to predict the East Asian summer monsoon, demonstrating highly consistent and quantitatively strong predictive features in signal contribution.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Shu Gui, Ruowen Yang, Feng Zeng, Jinxin Cheng
Summary: This study investigates the interdecadal variability of the interface between the Indian summer monsoon and the East Asian summer monsoon. Results suggest that this variability is closely linked to two air-sea coupled modes, which influence the strength of the East Asian summer monsoon by affecting the western North Pacific subtropical high and causing cyclonic and anticyclonic anomalies. In recent decades, the impact of one of these modes has weakened, while the other has become more influential on this variability.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Shu Gui, Ruowen Yang, Feng Zeng, Jinxin Cheng
Summary: This study investigates the interdecadal variability of the interface between the Indian summer monsoon and the East Asian summer monsoon. Results suggest that this variability is characterized by a zonal movement associated with variations between the Indian summer monsoon and the East Asian summer monsoon. This variability is closely linked to two air-sea coupled modes, resembling the Asian-Pacific Oscillation and the North Atlantic tripole pattern. Modeling results confirm the influence of these patterns on the interdecadal variability.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Chao He, Wen Zhou, Tim Li, Tianjun Zhou, Yuhao Wang
Summary: Anthropogenic emissions decreased during the COVID-19 pandemic, leading to an enhanced East Asian summer monsoon (EASM) in terms of precipitation and southerly wind at lower troposphere. This enhancement is a fast response to reduced aerosols and is supported by both observational and simulated evidence. The mechanism behind the enhancement is the enhanced zonal thermal contrast between Asian continent and the western North Pacific in the troposphere, due to reduced aerosol concentration over Asian continent and associated latent heating feedback.
Article
Multidisciplinary Sciences
Moriaki Yasuhara, Chih-Lin Wei, Michal Kucera, Mark J. Costello, Derek P. Tittensor, Wolfgang Kiessling, Timothy C. Bonebrake, Clay R. Tabor, Ran Feng, Andres Baselga, Kerstin Kretschmer, Buntarou Kusumoto, Yasuhiro Kubota
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Paleontology
Moriaki Yasuhara, Hisayo Okahashi, Huai-Hsuan May Huang, Yuanyuan Hong, Hokuto Iwatani, Rachel Wai Ching Chu, Gene Hunt
Summary: This study systematically describes Quaternary deep-sea ostracodes from the equatorial Atlantic Ocean, revealing a distinctive tropical fauna component that may have originated from the Cretaceous and early Cenozoic greenhouse conditions. The results show that deep-sea ostracodes now concentrate in low latitudes.
JOURNAL OF PALEONTOLOGY
(2021)
Article
Geography, Physical
Gerald Auer, Benjamin Petrick, Toshihiro Yoshimura, Briony L. Mamo, Lars Reuning, Hideko Takayanagi, David De Vleeschouwer, Alfredo Martinez-Garcia
Summary: A study reveals significant changes in productivity patterns in the eastern Indian Ocean during the Middle Pleistocene Transition, possibly due to the shoaling of nutrient-rich lower-thermocline waters.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Oceanography
C. Fontanier, B. Deflandre, S. Rigaud, B. Mamo, N. Dubosq, B. Lamarque, D. Langlet, S. Schmidt, P. Lebleu, D. Poirier, M. A. Cordier, A. Gremare
Summary: Live (Rose Bengal stained) shelf foraminiferal faunas along the West-Gironde Mud Patch (WGMP) in the Bay of Biscay, NE Atlantic were studied to understand the ecological patterns controlled by complex environmental conditions.
CONTINENTAL SHELF RESEARCH
(2022)
Article
Multidisciplinary Sciences
Susumu Tanabe, Toshimichi Nakanishi, Rei Nakashima
Summary: This study analyzed radiocarbon data from sediment samples along the north coast of Tokyo Bay in Japan and found evidence of reworking. The study revealed that the percentage of reworked samples and their average age offsets increased with the depth of the water environment. By using radiocarbon samples as a proxy for clastic material, the researchers determined that channel erosion played a smaller role in clastic removal in terrestrial and intertidal environments over short timescales, while storm winnowing and floods were responsible for transporting a significant amount of clastics to deeper water over longer timescales.
SCIENTIFIC REPORTS
(2022)
Article
Ecology
Johannes De Groeve, Buntarou Kusumoto, Erik Koene, W. Daniel Kissling, Arie C. Seijmonsbergen, Bert W. Hoeksema, Moriaki Yasuhara, Sietze J. Norder, Sri Yudawati Cahyarini, Alexandra van Der Geer, Hanneke J. M. Meijer, Yasuhiro Kubota, Kenneth F. Rijsdijk
Summary: This study presents a novel geophysically corrected global historical coastline position raster, which allows for the calculation of global and regional coastline retreat rates and land loss rates. Additionally, 53 shelf sea rasters were generated to calculate shelf sea expansion rates.
GLOBAL ECOLOGY AND BIOGEOGRAPHY
(2022)
Article
Environmental Sciences
Koji Seto, Kota Katsuki, Akira Tsujimoto, Junko Kitagawa, Kazuyoshi Yamada, Yoshiaki Suzuki
Summary: This study reconstructs the environmental and ecosystem changes in Lake Hiruga, Japan since the mid-18th century. The findings highlight the strong impacts of anthropogenic tunnel construction and natural hazards on the lagoon ecosystem, including changes in sediment composition and shifts in phytoplankton taxa.
JOURNAL OF PALEOLIMNOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Penghui Zhang, Huai-Hsuan M. Huang, Yuanyuan Hong, Skye Yunshu Tian, Jian Liu, Yong Il Lee, Jianwen Chen, Jie Liang, He Wang, Moriaki Yasuhara
Summary: This study analyzed fossil ostracods from the northwestern Pacific Ocean and found that the intensity of the East Asian winter monsoon affected the formation of Yellow Sea Bottom Cold Water and the southward migration of Arctic ostracods.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Ara Cho, Kaoru Kashima, Hannah Baranes, Caroline Ladlow, Kota Katsuki, Jonathan D. D. Woodruff
Summary: This paper investigates the paleoenvironmental change and distinguishes between tsunami and typhoon deposits by analyzing diatoms in sediment cores from two coastal lakes in southern Japan. The variation in diatom assemblages provides evidence of different origins of event deposits. The findings highlight the importance of tracking paleoenvironmental change for assessing natural hazards.
Article
Geography, Physical
Hiroto Kajita, Yuta Isaji, Rintaro Kato, Yoko Nishikura, Masafumi Murayama, Naohiko Ohkouchi, Shouye Yang, Hongbo Zheng, Ke Wang, Toshimichi Nakanishi, Takenori Sasaki, Ayumi Maeda, Atsushi Suzuki, Toshiro Yamanaka, Hodaka Kawahata
Summary: Climate change during the Holocene had a significant impact on human migration and development in Japan. The cultivation of paddy rice skills by people from mainland China led to population growth and changes in civilization in Japan. Analysis of sediment cores from China and Japan revealed similar temperature fluctuations over the past 7000 years, indicating the potential role of climate change in the migration of paddy rice farmers to Japan.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geology
Rachel Wai Ching Chu, Moriaki Yasuhara, Karoline Myrvang Riise, Hirofumi Asahi, Huai-Hsuan May Huang, Laura J. Cotton, Yuanyuan Hong, Tine L. Rasmussen
Summary: We reconstructed the history of methane seepage activity during the late Quaternary and examined the faunal response to deglacial climatic changes by analyzing fossil ostracode fauna paired with benthic foraminiferal δ13C values. The study found that the presence of the ostracode species Rosaliella svalbardensis in sediment assemblages was closely related to the intensity of methane seepage, while changes in other taxa were more influenced by global climate changes. Therefore, Rosaliella svalbardensis has the potential to be a useful proxy for past methane release.
Article
Geosciences, Multidisciplinary
Tatsuhiko Yamaguchi, Futoshi Nanayama, Toshimichi Nakanishi, Tomohiro Tsuji, Michiharu Ikeda, Yasuo Kondo, Michiko Miwa, Yohei Hamada
Summary: The study found evidence of middle Holocene tsunami events and deformation in sedimentary cores from southwestern Shikoku Island. By estimating relative sea level changes and vertical tectonic movement rates, the study revealed variations in tsunami events and crustal deformation in the region over the past millennia.
Article
Geosciences, Multidisciplinary
Futoshi Nanayama, Tomohiro Tsuji, Tatsuhiko Yamaguchi, Yasuo Kondo, Michiharu Ikeda, Toshimichi Nakanishi, Michiko Miwa, Chuki Hongo, Akira Furusawa, Mitsuhiro Kuwahata
Summary: The study confirms that the tsunami deposits near Kyushu Island and Shikoku Island originated from the 7.3 ka Kikai caldera eruption. These deposits contain material from outside the local environment and benthic organisms indicating habitats beyond the immediate area.
Article
Geosciences, Multidisciplinary
Susumu Tanabe, Yoshiro Ishihara, Toshimichi Nakanishi, Jan Stafleu, Freek S. Busschers
Summary: The study found that the thickness of soft mud in the Tokyo area is the main factor affecting the wooden house damage ratio, while the thickness of incised-valley fills has a smaller impact. The highest wooden house damage ratio occurs when the thickness of soft mud reaches 20 meters.
Article
Biology
Hideyuki Doi, Moriaki Yasuhara, Masayuki Ushio
Summary: The factors influencing deep-sea biodiversity include seafloor POC flux and temperature, with temperature being found to influence species richness over long time scales. Future climate change may affect deep-sea ecosystems through changes in deep-water circulation rather than surface productivity.