Article
Meteorology & Atmospheric Sciences
Yi Li, Youmin Tang, Xiaojing Li, Xiangzhou Song, Qiang Wang
Summary: Conventionally, the threat of tropical cyclones (TCs) has been assessed based on TC intensity. However, damage caused by TCs is strongly influenced by forecasting ability, which is often limited for rapidly intensifying TCs. In this study, we introduce the concept of TC potential threat (PT) by combining the TC lifetime maximum intensity and intensification rate. We find that approximately 10% of TCs exhibit high PT and pose significant forecast errors. Additionally, the number of TCs with high PT has increased by 22% per decade over the past 41 years, attributed to rising subsurface ocean temperatures. Our findings provide insights into the TC threat and highlight its increase due to global warming and internal climate variability.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Multidisciplinary Sciences
Joseph Basconcillo, Il-Ju Moon
Summary: The recent increase in Christmas typhoons is mainly associated with the shift of the Pacific Decadal Oscillation to its positive phase, leading to favorable changes in large-scale environmental conditions for tropical cyclone development. Additionally, the poleward shift of the Intertropical Convergence Zone and the recent recovery of the Siberian High have contributed to the increased occurrence of tropical cyclones.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Canbo Xiao, Wei Fan, Ying Chen, Yao Zhang, Kai Tang, Nianzhi Jiao
Summary: This study suggests that implementing artificial downwelling and upwelling in the Western Subarctic North Pacific can effectively combat deoxygenation, with downwelling being more effective. The oxygenation process takes around 40 years to complete with no further improvement thereafter, reaching a new equilibrium state.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Zhanhong Ma, Zheliang Zhang, Jianfang Fei, Huizan Wang
Summary: This study investigates the impact of tropical cyclones on the structural characteristics of oceanic eddies in the western North Pacific. The results show that the strength and size of both warm-core and cold-core eddies are modulated by the passage of tropical cyclones, with changes in amplitude, circulation speed, and mixed-layer depth. Additionally, tropical cyclones can prolong the lifetimes of eddies and impact air-sea energy exchange through altering sea surface temperature response.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Meteorology & Atmospheric Sciences
Na Li, Ziniu Xiao, Liang Zhao
Summary: This study reveals that the occurrence of long-lived heatwaves is strongly associated with the joint actions of the South Asian high and the western North Pacific subtropical high. A significant interdecadal shift around 2004/05 towards increased heatwave occurrence is consistent with the enhanced subtropical high systems. The study highlights the important roles of large-scale dynamic systems in regional climate extremes and their future changes.
JOURNAL OF CLIMATE
(2021)
Article
Geosciences, Multidisciplinary
Casey R. Patrizio, David W. J. Thompson
Summary: Previous research has shown that the extratropical atmospheric circulation is influenced by sea-surface temperature (SST) variability in the western North Pacific. However, the relative contributions of oceanic and atmospheric processes to the SST anomalies and their impact on the atmospheric circulation are not well understood. In this study, a simple stochastic climate model was used to separate SST variability in the Kuroshio-Oyashio Extension region into components forced by oceanic and atmospheric processes. The results indicate that only the ocean-forced SST variability is associated with significant atmospheric anomalies that occur one month later. These findings suggest that ocean dynamical processes in the western North Pacific play an important role in influencing the variability of the extratropical circulation.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Zhenzhen Wang, Renguang Wu, Yuqi Wang
Summary: This study investigates the independent impacts of the East Asian winter monsoon (EAWM) on winter precipitation anomalies over East Asia and the western North Pacific. The results show that strong EAWM years lead to a south-north dipole pattern of precipitation anomalies in these regions. Observations and model simulations suggest that both vertical motion and horizontal moisture transport play important roles in the formation of the precipitation anomaly pattern.
Article
Meteorology & Atmospheric Sciences
Zizhen Dong, Lin Wang
Summary: This study investigates the characteristics and climate impacts of the quasi-biweekly oscillation (QBWO) over the western North Pacific (WNP) in boreal winter. The wintertime convection over the WNP is influenced by significant biweekly variability, with a leading mode of northwestward-propagating convection dipole. When the convection-active center of this QBWO is located to the east of the Philippines, it can induce upper-tropospheric divergence and excite a Rossby wave train propagating towards North America, leading to cold anomalies over central North America in the following week.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Ho-Nam Cheung, Nour-Eddine Omrani, Fumiaki Ogawa, Noel Keenlyside, Hisashi Nakamura, Wen Zhou
Summary: Atmospheric blocking is important for extreme weather events, but current climate models underestimate its frequency, particularly around the North Atlantic. This study shows that the mid-latitude Pacific oceanic front plays a crucial role in climatological Atlantic blocking activity. The front strengthens the Pacific jet, which extends towards the North Atlantic, reinforcing the Atlantic circulation response and increasing Euro-Atlantic blocking.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Environmental Sciences
Sheng Lin, Wen-Zhou Zhang, Yuntao Wang, Fei Chai
Summary: This study reveals the significant impact of interactions between typhoons and eddies on the upper ocean responses, particularly the enhanced sea surface cooling due to the presence of eddies. It also highlights the important roles of vertical mixing and advection of eddy-related currents in sea surface cooling.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Shengyi Qian, Haibo Hu, Xuanjuan Ren, Xiu-Qun Yang, Peilong Yu, Kefeng Mao
Summary: This paper investigates the characteristics and mechanism of subseasonal variation of the Western Pacific jet stream (WPJS) in winter. The subseasonal variability of WPJS is formed by the merging of upstream atmospheric disturbances in the East Asian polar-front jet and subtropical jet over the Northwestern Pacific, with a significant period of 40-60 days. The positive phase events of subseasonal WPJS are accompanied by a southward shift in the convergence position of upstream atmospheric disturbances, as well as local enhancement and eastward extension of the subseasonal WPJS. On the other hand, during negative phase events, the subseasonal WPJS divides into southern and northern westerly branches.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Hua Li, Shengping He, Ke Fan, Yong Liu, Xing Yuan
Summary: The study shows that the winter sea surface temperature anomalies in the North Pacific Ocean have a significant impact on the mei-yu withdrawal date over East Asia, especially intensifying since the early 1990s. The enhanced interannual variability of the North Pacific SST anomalies may be attributed to the more persistent anomalies during the time period 1990-2016.
JOURNAL OF CLIMATE
(2021)
Article
Meteorology & Atmospheric Sciences
Chang-Hyun Park, Seok-Woo Son, Yuna Lim, Jung Choi
Summary: The study found that the quasi-biennial oscillation (QBO) has a negative impact on the surface air temperature in the Northern Hemisphere extratropics, especially in February and March. This impact is likely mediated by the subtropical jet and is accompanied by anomalies in zonal wind and circulation, resulting in the advection of cold air to East Asia and the western North Pacific.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Ornithology
Stephanie A. Cunningham, Qing Zhao, Mitch D. Weegman
Summary: Using a Bayesian integrated population model (IPM), this study analyzed demographic data of Greater White-fronted Geese and found that the ban on rice field burning and subsequent flooding were the primary drivers of the population increase, while the effects of climate change and density dependence were not strong enough to suppress this benefit.
Article
Geosciences, Multidisciplinary
Wengui Liang, Minghua Zhang
Summary: This study investigates the mechanisms of increased winter precipitation in the eastern North America under a warmer climate. The research shows that enhanced moisture convergence in the southeast United States is mainly caused by local thermodynamics due to increased moisture, while in the north it is primarily due to the increase of moisture gradient associated with the spatial distribution of temperature and eddy temperature in the region.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Eitarou Oka, Kodai Yamada, Daisuke Sasano, Kazutaka Enyo, Toshiya Nakano, Masao Ishii
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Environmental Sciences
Chunmao Zhu, Yugo Kanaya, Hisayuki Yoshikawa-Inoue, Tomohisa Irino, Osamu Seki, Yasunori Tohjima
ENVIRONMENTAL POLLUTION
(2019)
Article
Geosciences, Multidisciplinary
Hisashi Ono, Naohiro Kosugi, Katsuya Toyama, Hiroyuki Tsujino, Atsushi Kojima, Kazutaka Enyo, Yosuke Iida, Toshiya Nakano, Masao Ishii
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Ecology
Oanh Thi Ngoc Bui, Sohiko Kameyama, Yusuke Kawaguchi, Shigeto Nishino, Urumu Tsunogai, Hisayuki Yoshikawa-Inoue
Article
Oceanography
Taku Wagawa, Shin-ichi Ito, Shigeho Kakehi, Yugo Shimizu, Kazuyuki Uehara, Tsurane Kuragano, Toshiya Nakano
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2020)
Article
Oceanography
Shintaro Takao, Shin-Ichiro Nakaoka, Fuminori Hashihama, Keishi Shimada, Hisayuki Yoshikawa-Inoue, Toru Hirawake, Jota Kanda, Gen Hashida, Koji Suzuki
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2020)
Article
Environmental Sciences
Masao Ishii, Keith B. Rodgers, Hisayuki Y. Inoue, Katsuya Toyama, Daisuke Sasano, Naohiro Kosugi, Hisashi Ono, Kazutaka Enyo, Toshiya Nakano, Daniele Iudicone, Bruno Blanke, Olivier Aumont, Richard A. Feely
GLOBAL BIOGEOCHEMICAL CYCLES
(2020)
Article
Oceanography
Shinya Kouketsu, Daisuke Sasano, Satoshi Osafune, Michio Aoyama
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2020)
Article
Ecology
Yasunori Tohjima, Jiye Zeng, Tomoko Shirai, Yosuke Niwa, Shigeyuki Ishidoya, Fumikazu Taketani, Daisuke Sasano, Naohiro Kosugi, Sohiko Kameyama, Hisahiro Takashima, Hideki Nara, Shinji Morimoto
Summary: Observations and simulations show that methane emissions from the East Siberian Arctic Shelf (ESAS) are lower than previously estimated, with the optimized emissions positively correlated with sea surface temperature and negatively correlated with ice concentration in the ESAS region.
Article
Environmental Sciences
Sakae Toyoda, Takahito Kakimoto, Kushi Kudo, Naohiro Yoshida, Daisuke Sasano, Naohiro Kosugi, Masao Ishii, Sohiko Kameyama, Mahomi Inagawa, Hisayuki Yoshikawa-Inoue, Shigeto Nishino, Akihiko Murata, Shigeyuki Ishidoya, Shinji Morimoto
Summary: Ocean-atmosphere gas exchange in the Arctic Ocean is sensitive to global warming because the decrease of sea-ice covered area enhances the exchange. The isotopic signatures of dissolved N2O in the Chukchi Sea shelf indicate a mixture of N2O produced in the bottom water and that of atmospheric origin.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Geosciences, Multidisciplinary
Bo Qiu, Toshiya Nakano, Shuiming Chen, Patrice Klein
Summary: Understanding the transfer of energy in ocean circulation across different lengthscales is crucial for comprehending its equilibrium and variability. Recent advancements in high-resolution numerical simulations have enhanced our understanding of kinetic energy cascades, although observational evidence remains limited. This study uses repeat ship-board velocity measurements to demonstrate the presence of balanced and unbalanced oceanic motions and their contribution to the directional energy cascades, influencing the length scale separating the cascades.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Ecology
Lothar Stramma, Sunke Schmidtko, Steven J. Bograd, Tsuneo Ono, Tetjana Ross, Daisuke Sasano, Frank A. Whitney
