Article
Geosciences, Multidisciplinary
Xueqing Wang, Xiu-Qun Yang
Summary: This study analyzes the impact of El Nino/Southern Oscillation (ENSO) on the Pacific-North American (PNA) teleconnection pattern in wintertime. It finds that the asymmetry of ENSO has become more pronounced in recent decades. The study quantifies the extratropical asymmetric impact on the amplitude of the PNA pattern and attributes the amplification mainly to increases in asymmetry of Rossby wave source (RWS) anomalies over key regions in the North Pacific.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geography, Physical
Linlin Gao, Yang Deng, Xiaoya Yan, Qian Li, Yu Zhang, Xiaohua Gou
Summary: Research shows that the recent decline in streamflow of the Bailong River is unprecedented over the past few centuries, with the most severe decreases occurring in the 1990s and 2000s. Higher temperatures and declining precipitation are the main factors leading to the decrease in streamflow, with temperature having a stronger influence compared to precipitation. Continued warming is likely to result in a further decline in the river's streamflow, impacting local water supply, societal well-being, and economic development.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Environmental Sciences
Ya Wang, Kaiming Hu, Gang Huang, Weichen Tao
Summary: The asymmetric impacts of El Nino and La Nina on the Pacific-North American teleconnection pattern are influenced by the varying tropical convective heating and discrepancy of the subtropical jet stream. This leads to the eastward (westward) shift of the STJ during El Nino (La Nina) years, ultimately contributing to the asymmetry of the teleconnection pattern.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Daniel A. Bishop, A. Park Williams, Richard Seager, Edward R. Cook, Dorothy M. Peteet, Benjamin Cook, Mukund P. Rao, David W. Stahle
Summary: Instrumental records show a significant trend towards drying in western North America and wetting in eastern North America over the past century. Recent observations reveal a notable shift in aridity gradient, with the period from 2001 to 2020 experiencing the largest aridity gradient since 1400 CE, indicating substantial changes in water availability across the continent.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Jose Villanueva-Diaz, Arian Correa-Diaz, Luis Ubaldo Castruita-Esparza, Jesus Valentin Gutierrez-Garcia, Aldo Rafael Martinez-Sifuentes, Fatima del Rocio Reyes-Camarillo
Summary: A dendrochronological network was established in Cumbres de Majalca National Park, Mexico, to reconstruct historical runoff patterns and assess the impact of ocean-atmosphere phenomena. The study found a common signal in the ring-width chronologies between different conifer species, with P. leiophylla showing the highest correlation with streamflow records. The analysis revealed periods of low and high runoff, with a significant correlation between interannual streamflow variability and ENSO indices.
Article
Meteorology & Atmospheric Sciences
Sarah M. Larson, Yuko Okumura, Katinka Bellomo, Melissa L. Breeden
Summary: Careful attribution of the role of El Nino-Southern Oscillation (ENSO) is necessary for identifying the origins of wintertime climate variations in the Northern Hemisphere. This study uses coupled model experiments to investigate how ENSO affects the responses of Aleutian low variability to sea surface temperature (SST) and precipitation in North America. The results show that ENSO modulates the SST anomalies induced by non-ENSO Aleutian low variability, leading to wet precipitation anomalies in the southeastern United States.
JOURNAL OF CLIMATE
(2022)
Article
Geosciences, Multidisciplinary
Qiang Ma, Jianing Wang, Fan Wang, Yilong Lyu, Zhixiang Zhang
Summary: The Pacific Decadal Oscillation (PDO) influences the El Nino-Southern Oscillation and can modulate the equatorial intermediate currents. This modulation is achieved through the propagation of reflected Kelvin-to-Rossby waves triggered by anomalous westerly wind.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Haili Wang, Chunzai Wang
Summary: Based on observational data, this study finds that there are large-scale anomalous cyclones and anticyclones in the western North Pacific (WNP), with similar occurrence numbers. The WNP anomalous cyclone is identified as an interannual circulatory anomaly that can persist from autumn to spring during La Niña years and from spring to summer during developing El Niño years. The central equatorial Pacific warming contributes to the WNP anomalous cyclone during developing El Niño years, while the combination of central equatorial Pacific cooling, tropical Indian Ocean cooling, and central WNP warming induces the WNP anomalous cyclone during La Niña years.
JOURNAL OF CLIMATE
(2023)
Article
Environmental Sciences
Nicola Maher, Jennifer E. Kay, Antonietta Capotondi
Summary: This study reveals the significant impact of the Pacific Decadal Oscillation (PDO) on the temperature and precipitation teleconnections of El Nino Southern Oscillation (ENSO) events over North America, with positive PDO enhancing El Nino teleconnections and diminishing La Nina teleconnections.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Zachary F. Johnson, Daniel R. Chavas, Hamish A. Ramsay
Summary: This study introduces a statistical framework for estimating the seasonal count of tropical cyclone (TC) landfalls and identifies the influences of El Nino-Southern Oscillation (ENSO) and the western extent of the Pacific subtropical high (WPSH) on landfall count. The study finds that ENSO modulates the zonal distribution of TC genesis, while the WPSH modulates the meridional distribution of landfall probability.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Wenxiu Zhong, Wenju Cai, Arnold Sullivan, Wansuo Duan, Song Yang
Summary: This article investigates the combined effects of the North Pacific Oscillation (NPO) and the South Pacific Oscillation (SPO) on the interannual wind in the western-central equatorial Pacific (WCEP). The NPO influences the WCEP interannual wind during the boreal winter-spring by modulating the Northwestern Pacific Intertropical Convergence Zone (NITCZ). As austral winter approaches, the SPO takes over this role and maintains the anomalous NITCZ. The NPO benefits long-lead prediction of the WCEP interannual wind and El Niño-Southern Oscillation (ENSO), while the SPO is the dominant extratropical predictor of ENSO amplitude.
JOURNAL OF CLIMATE
(2023)
Article
Geosciences, Multidisciplinary
Yi Liu, Ziguang Li, Xiaopei Lin, Jun-Chao Yang
Summary: The study suggests that under greenhouse warming, the connection between El Nino and the tropical North Atlantic will strengthen, leading to an increase in anomalous warming/cooling and related weather extremes in the future.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Yingying Zhao, Matthew Newman, Antonietta Capotondi, Emanuele Di Lorenzo, Daoxun Sun
Summary: The study shows that tropical regions contribute significantly to North Pacific climate variability, especially along the North American coast and within the Subtropical Front region northwest of Hawaii. Conversely, variability within the Kuroshio-Oyashio Extension region is less impacted by tropical regions. CMIP6 models tend to exhibit North Pacific variability that aligns more with the KOE pattern rather than the PDO pattern seen in observations.
JOURNAL OF CLIMATE
(2021)
Article
Meteorology & Atmospheric Sciences
Jae-Heung Park, Jong-Seong Kug, Young-Min Yang, Hyoeun Oh, Jiuwei Zhao, Yikai Wu
Summary: This study examined the impact of anomalous sea surface temperature in the north tropical Atlantic (NTA) on El Nino-Southern Oscillation (ENSO) and the diversity of this impact in climate models. The analysis found that the strength of NTA's effect on ENSO in the climate models was proportional to the intensity of the climatological subtropical North Pacific high system in boreal spring. The observed NTA effect on ENSO also became stronger during periods when the climatological subtropical North Pacific high intensified, indicating the importance of climatology in the NTA-ENSO connection.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Ingo Richter, Malte F. Stuecker, Naoya Takahashi, Niklas Schneider
Summary: Variations of sea-surface temperature in the subtropical North Pacific, known as the North Pacific Meridional Mode, may not be accurately captured by the current statistical technique of maximum covariance analysis. This raises the need for refined tools to diagnose variability in this region.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2022)
Article
Environmental Sciences
Jan Altman, Kerstin Treydte, Vit Pejcha, Tomas Cerny, Petr Petrik, Miroslav Srutek, Jong-Suk Song, Valerie Trouet, Jiri Dolezal
Article
Environmental Sciences
Guobao Xu, Xiaohong Liu, Weizhen Sun, Paul Szejner, Xiaomin Zeng, Kei Yoshimura, Valerie Trouet
ENVIRONMENTAL RESEARCH LETTERS
(2020)
Article
Environmental Sciences
Guobao Xu, Guoju Wu, Xiaohong Liu, Tuo Chen, Bo Wang, Amy Hudson, Valerie Trouet
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2020)
Article
Forestry
Nikolay Zafirov, Momchil Panayotov, Nickolay Tsvetanov, Ivona Nikolchova, Valerie Trouet
Article
Multidisciplinary Sciences
Bao Yang, Chun Qin, Achim Braeuning, Timothy J. Osborn, Valerie Trouet, Fredrik Charpentier Ljungqvist, Jan Esper, Lea Schneider, Jussi Griessinger, Ulf Buentgen, Sergio Rossi, Guanghui Dong, Mi Yan, Liang Ning, Jianglin Wang, Xiaofeng Wang, Suming Wang, Juerg Luterbacher, Edward R. Cook, Nils Chr Stenseth
Summary: This study presented a treering stable isotope chronology from the Tibetan Plateau to examine the variability of the Asian summer monsoon, identifying a megadrought in the second millennium BCE that significantly impacted the ecosystems and societies in northern China.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Forestry
Evrim A. Sahan, Nesibe Kose, Unal Akkemik, H. Tuncay Guner, Cagatay Tavsanoglu, Anil Bahar, Valerie Trouet, H. Nuzhet Dalfes
Summary: This study aims to improve the understanding of fire regime components in black pine forests in Turkey. By reconstructing a fire chronology based on tree rings, investigating the seasonality of fires, and comparing with documentary data, it was found that fire frequency declined sharply after the beginning of the 20th century due to increased fire suppression efforts. However, the seasonality of fires did not change over the past +350 years.
Article
Geosciences, Multidisciplinary
Pieter A. Zuidema, Flurin Babst, Peter Groenendijk, Valerie Trouet, Abrham Abiyu, Rodolfo Acuna-Soto, Eduardo Adenesky-Filho, Raquel Alfaro-Sanchez, Jose Roberto Vieira Aragao, Gabriel Assis-Pereira, Xue Bai, Ana Carolina Barbosa, Giovanna Battipaglia, Hans Beeckman, Paulo Cesar Botosso, Tim Bradley, Achim Braeuning, Roel Brienen, Brendan M. Buckley, J. Julio Camarero, Ana Carvalho, Gregorio Ceccantini, Librado R. Centeno-Erguera, Julian Cerano-Paredes, Alvaro Agustin Chavez-Duran, Bruno Barcante Ladvocat Cintra, Malcolm K. Cleaveland, Camille Couralet, Rosanne D'Arrigo, Jorge Ignacio del Valle, Oliver Duenisch, Brian J. Enquist, Karin Esemann-Quadros, Zewdu Eshetu, Ze-Xin Fan, M. Eugenia Ferrero, Esther Fichtler, Claudia Fontana, Kainana S. Francisco, Aster Gebrekirstos, Emanuel Gloor, Daniela Granato-Souza, Kristof Haneca, Grant Logan Harley, Ingo Heinrich, Gerd Helle, Janet G. Inga, Mahmuda Islam, Yu-mei Jiang, Mark Kaib, Zakia Hassan Khamisi, Marcin Koprowski, Bart Kruijt, Eva Layme, Rik Leemans, A. Joshua Leffler, Claudio Sergio Lisi, Neil J. Loader, Giuliano Maselli Locosselli, Lidio Lopez, Maria Lopez-Hernandez, Jose Luis Penetra Cerveira Lousada, Hooz A. Mendivelso, Mulugeta Mokria, Valdinez Ribeiro Montoia, Eddy Moors, Cristina Nabais, Justine Ngoma, Francisco de Carvalho Nogueira Junior, Juliano Morales Oliveira, Gabriela Morais Olmedo, Mariana Alves Pagotto, Shankar Panthi, Gonzalo Perez-De-Lis, Darwin Pucha-Cofrep, Nathsuda Pumijumnong, Mizanur Rahman, Jorge Andres Ramirez, Edilson Jimmy Requena-Rojas, Adauto de Souza Ribeiro, Iain Robertson, Fidel Alejandro Roig, Ernesto Alonso Rubio-Camacho, Ute Sass-Klaassen, Jochen Schongart, Paul R. Sheppard, Franziska Slotta, James H. Speer, Matthew D. Therrell, Benjamin Toirambe, Mario Tomazello-Filho, Max C. A. Torbenson, Ramzi Touchan, Alejandro Venegas-Gonzalez, Ricardo Villalba, Jose Villanueva-Diaz, Royd Vinya, Mart Vlam, Tommy Wils, Zhe-Kun Zhou
Summary: According to a pantropical tree-ring network, dry-season climate variability is a primary driver of tropical tree growth. The study found that woody biomass growth increases with dry-season precipitation and decreases with dry-season maximum temperature. The strength of these dry-season climate responses varies among sites and is influenced by drier, hotter, and more climatically variable regions.
Article
Meteorology & Atmospheric Sciences
Feng Chen, Yujiang Yuan, Valerie Trouet, Ulf Buntgen, Jan Esper, Fahu Chen, Shulong Yu, Miaogen Shen, Ruibo Zhang, Huaming Shang, Youping Chen, Heli Zhang
Summary: Understanding changes in water availability is crucial for Central Asia. However, long-term streamflow reconstructions are lacking. Based on a study of spruce tree rings from the Tien Shan Mountains, we found that periods of high streamflow coincided with the Mongol expansion and the rise of the Timurid Empire. Furthermore, we suggest that the streamflow variation may be linked to plague outbreaks in Central Asia and Europe's Black Death pandemics. We also discovered that low streamflow in the 20th century is unprecedented and worsened the Aral Sea crisis.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2022)
Letter
Multidisciplinary Sciences
Qichao Yao, Keyan Fang, Tinghai Ou, Feifei Zhou, Maosheng He, Ben Zheng, Jane Liu, Hang Xing, Valerie Trouet
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
Diana Zamora-Reyes, Ellie Broadman, Erica Bigio, Bryan Black, David Meko, Connie A. Woodhouse, Valerie Trouet
Summary: Year-to-year swings in winter precipitation extremes in California have caused significant damage through droughts, wildfires, and floods. Using tree-ring-based reconstructions, this study reveals a long-term trend of increasing hydroclimate variability in California, driven by rising magnitudes of wet and dry extremes in the 20th and 16th centuries respectively. These findings align with climate model simulations, emphasizing the need for collaboration between scientists and water resource managers in order to incorporate the increased variability and higher risks of compound events into decision-making and planning processes.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Hsun-Ming Hu, Chuan-Chou Shen, John C. H. Chiang, Valerie Trouet, Veronique Michel, Hsien-Chen Tsai, Patricia Valensi, Christoph Spoetl, Elisabetta Starnini, Marta Zunino, Wei-Yi Chien, Wen-Hui Sung, Yu-Tang Chien, Ping Chang, Robert Korty
Summary: This study focuses on the Little Ice Age (LIA), specifically the climate patterns and hydroclimatic conditions in Europe during the early LIA. By analyzing a new stalagmite record from northern Italy and other published data, researchers discovered a split in the climatological westerlies during the early LIA, possibly attributed to sea ice melting.
NATURE COMMUNICATIONS
(2022)
Correction
Multidisciplinary Sciences
Hsun-Ming Hu, Chuan-Chou Shen, John C. H. Chiang, Valerie Trouet, Veronique Michel, Hsien-Chen Tsai, Patricia Valensi, Christoph Spotl, Elisabetta Starnini, Marta Zunino, Wei-Yi Chien, Wen-Hui Sung, Yu-Tang Chien, Ping Chang, Robert Korty
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Hsun-Ming Hu, Valerie Trouet, Christoph Spoetl, Hsien-Chen Tsai, Wei-Yi Chien, Wen-Hui Sung, Veronique Michel, Jin-Yi Yu, Patricia Valensi, Xiuyang Jiang, Fucai Duan, Yongjin Wang, Horng-Sheng Mii, Yu-Min Chou, Mahjoor Ahmad Lone, Chung-Che Wu, Elisabetta Starnini, Marta Zunino, Takaaki K. Watanabe, Tsuyoshi Watanabe, Huang-Hsiung Hsu, G. W. K. Moore, Giovanni Zanchetta, Carlos Perez-Mejias, Shih-Yu Lee, Chuan-Chou Shen
Summary: The variability of the northern westerlies has significant impacts on modern and past climate evolution. However, the multi-scale behavior and underlying control mechanisms of these westerlies are not fully understood due to the complex dynamics of Atlantic sea-level pressures. By studying the multi-annually resolved record of westerly drift over the past 6,500 years from northern Italy, combined with other westerly-sensitive records, it is found that the regions affected by the westerlies in mainland Europe are non-stationary on multi-decadal to multi-centennial time scales, and the direction of the westerlies has changed in relation to the migrations of the North Atlantic centers of action since the middle Holocene. The findings suggest that the migrations of the North Atlantic dipole play a crucial role in modulating the westerly-affected domain over Europe, possibly influenced by Atlantic Ocean variability.
NATURE COMMUNICATIONS
(2022)
Correction
Multidisciplinary Sciences
Hsun-Ming Hu, Chuan-Chou Shen, John C. H. Chiang, Valerie Trouet, Veronique Michel, Hsien-Chen Tsai, Patricia Valensi, Christoph Spotl, Elisabetta Starnini, Marta Zunino, Wei-Yi Chien, Wen-Hui Sung, Yu-Tang Chien, Ping Chang, Robert Korty
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Justin T. Maxwell, Joshua C. Bregy, Scott M. Robeson, Paul A. Knapp, Peter T. Soule, Valerie Trouet
Summary: The study found that tropical cyclone precipitation extremes have increased in North America's coastal regions over the past few centuries, especially in the last 60 years, indicating a consistent trend with slower movement speeds of tropical cyclones under anthropogenic climate change.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)