Article
Engineering, Environmental
Daniele de A. Miranda, Juliana Leonel, Jonathan P. Benskin, Jana Johansson, Vanessa Hatje
Summary: The study found that the distribution of PFAS in the Western Tropical Atlantic Ocean varied with depth and longitude sectors. PFAS mainly existed in the form of perfluoroalkyl carboxylic acids, and the origin of different water masses was also an important factor affecting PFAS concentrations and profiles.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Oceanography
Yuan Cao, Xidong Wang, Caixia Shao
Summary: A mixing length theory considering the characteristics of tropical cyclones and upper ocean stratification is used to estimate the diapycnal diffusivity induced by tropical cyclones (TC) and to investigate its trend, interannual, and interdecadal variability globally and in each basin. The results show that El Nino and Southern Oscillation primarily modulate the variability of TC-induced diapycnal diffusivity by regulating ocean stratification. Additionally, the relationship between TC-induced diapycnal diffusivity and dominant climate modes such as Pacific Decadal Oscillation and North Atlantic Oscillation may interact on interdecadal timescales.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Mechanics
Ryosuke Kurashina, Pavel Berloff, Igor Shevchenko
Summary: This study examines the influence of flow nonlinearity in western boundary layers on wind-driven ocean gyres. Nonlinear effects are found to play a crucial role in shaping the circulation patterns, particularly in balancing potential vorticity between gyres downstream. Furthermore, Lagrangian particle analysis reveals inter-gyre exchange mechanisms that weaken the eastward jet extension.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Oceanography
Fanglou Liao, Xinfeng Liang, Yun Li, Michael Spall
Summary: The study reveals robust subsurface upwelling systems associated with Western boundary currents, which have significant climate and ecological implications. However, this process has been largely overlooked, calling for further research.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Meteorology & Atmospheric Sciences
Xi Cao, Renguang Wu, Jing Xu, Yifeng Dai, Mingyu Bi, Xiaoqing Lan, Xiping Zhang
Summary: There was a distinct difference in the occurrence of tropical cyclones over the western North Pacific in August of 1996 and 2014. In 1996, a wave train induced favorable conditions for tropical cyclone formation, while in 2014, the environmental conditions were hostile to the formation of tropical cyclones.
ATMOSPHERIC RESEARCH
(2022)
Article
Astronomy & Astrophysics
Ying Li, Shanshan Zhao, Dajun Zhao, Ge Gao, Hongxiong Xu, Yundi Jiang
Summary: Based on the analysis of provincial-level TC disaster losses data from 2001 to 2020 in China, it was found that the areas impacted by TCs expanded significantly in the past decade, especially in Northeast China and Fujian province. Causal analysis indicated that increased influential TC frequency and TC precipitation led to the increase in damage for northern China, while more westward influential TCs resulted in the increase in TC disasters for southwestern China. The reduction in TC disasters in southeastern China was related to the northward shift in the northwestward influential TC track. Therefore, more attention should be paid to TC prediction and early warning in northern China, especially Northeast China, where TC disasters are growing but there is greater vulnerability and insufficient capacity for TC prevention and mitigation.
EARTH AND SPACE SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Eleanor G. G. Casas, Dandan Tao, Michael M. M. Bell
Summary: Intensity and size are important metrics to characterize tropical cyclones, but there are various ways to define them. In this study, a new set of orthogonal metrics for TC intensity and size are calculated using aircraft observations and Best Track information. These new metrics simplify the dimensional space and allow for visualization and contextualization of key structural changes in tropical cyclones. Additionally, a new parameter that measures wind decay outside the radius of maximum tangential velocity is introduced and found to be useful for identifying TC maturity. The utility of the new phase space is demonstrated through comparisons of observed and modeled tropical cyclones.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Nanda Kishore Reddy Busireddy, Kumar Ankur, Krishna K. Osuri, Dev Niyogi
Summary: This study models the sensitivity of tropical cyclone parameters to ocean warming, finding that it affects the direction, size, intensity, rainfall, and destructive potential of cyclones. The simulations reveal that ocean warming causes cyclones to shift in direction and change in size and intensity. The study also shows that the radius of 34-knot wind is more sensitive to sea surface temperature warming than the radius of maximum winds. Additionally, heavy rainfall extends to greater distances around cyclone centers with sea surface temperature warming.
ATMOSPHERIC RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Jun Gao, Haikun Zhao, Philip J. Klotzbach, Fengpeng Sun, Graciela B. Raga, Chao Wang, Zhanhong Ma
Summary: This study investigates the inter-annual changes in tropical cyclone season onset over the western North Pacific in neutral ENSO conditions. The study finds that the onset of the season is earlier in early years compared to late years. There are also differences in cyclone counts and genesis locations between different seasons. These seasonal changes are closely associated with changes in the large-scale environmental pattern, driven by the seasonal evolution of sea surface temperature anomalies.
Article
Geosciences, Multidisciplinary
Jiuwei Zhao, Fang Wang, Ruifen Zhan, Yipeng Guo, Xin Huang, Chao Liu
Summary: The global tropical cyclone (TC) genesis frequency (TCGF) shows a parabolic relation with spatio-uniform climate changes in sea surface temperature (SST) from -15 K to 5 K, with a peak in the 5 K-cooler climate. This parabolic relation is observed in all TC basins except the eastern North Pacific, where TCGF continues to increase with changing climate. TCGF can be measured as the product of TC seeds frequency and TC survival rate (SR). Analysis reveals that the parabolic structure in global TCGF depends on TC seeds rather than TC SR, with TC seeds showing consistent changes with TCGF possibly linked to low-level relative humidity.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Peng Zhang, Zhiwei Wu, Zhiwei Zhu, Rui Jin
Summary: Research has found a close link between the Chukchi-Beaufort (C-B) and Greenland (GL) sea ice variability and the frequency of tropical cyclone formation in the western North Pacific (WNP). Excessive sea ice leads to the southeastward propagation of Rossby wave trains, resulting in anomalous low pressure over WNP and favorable conditions for tropical cyclone formation. The presence of sea ice serves as a significant precursor for predicting tropical cyclone formation.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Karthik Balaguru, Gregory R. Foltz, L. Ruby Leung, Samson M. Hagos
Summary: Tropical cyclones are often accompanied by strong winds and torrential rains. The competition between the stabilizing effect of rainfall and wind-induced mixing, as well as the degree to which it modulates TC-induced sea surface cooling, remain unknown. This study shows that heavy rains under weak TCs can significantly reduce the magnitude of cold wakes induced by them, with the ocean surface freshening and cooling less.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Eleanor G. Casas, Dandan Tao, Michael M. Bell
Summary: Intensity and size are important metrics in characterizing tropical cyclone (TC), but their definitions can vary. This study introduces new orthogonal metrics of TC intensity and size using aircraft observations and Best Track information. These new metrics simplify the co-varying parameters into a two-dimensional phase space, allowing for visualization and historical contextualization of key TC structural changes. Additionally, a new parameter for wind decay outside the radius of maximum tangential velocity is introduced and shown to be useful for identifying TC maturity. The utility of the new phase space is demonstrated by comparing the structural evolution of Hurricane Rita (2005) and Hurricane Charley (2004) using observations and modeling simulations of Hurricane Rita with different initial conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Yao Ha, Zhong Zhong, Haikun Zhao, Yimin Zhu, Yao Yao, Yijia Hu
Summary: This paper presents the results of an observational study on the contribution of tropical cyclones (TCs) in the western North Pacific (WNP) to synoptic-scale transient eddy activity (STEA) in the North Pacific during autumn and early winter from 1979 to 2019. The study finds that WNP TCs entering the mid-latitudinal North Pacific have a significant positive effect on the strength of STEA, especially over the Kuroshio/Oyashio Extensions (KOE) and regions east of Japan. The intensity of TCs is highly indicative of subsequent STEA, with a stronger impact observed in the upper troposphere.
ADVANCES IN ATMOSPHERIC SCIENCES
(2022)
Article
Astronomy & Astrophysics
Xiaoning Wu, Kevin A. Reed, Patrick Callaghan, Julio T. Bacmeister
Summary: High-resolution climate models can realistically simulate tropical cyclones. However, the simulated number and location of TCs in the Western North Pacific region are different from observations. The lack of mid-level moisture is identified as the leading cause of the simulated WNP TC genesis deficit, and improving the large-scale environment can lead to better simulation of TCs.
EARTH AND SPACE SCIENCE
(2022)
Article
Environmental Sciences
Sok Kuh Kang, Young Ho Seung, Kyeong Ok Kim, Eun Jin Kim, Kyung Tae Jung
JOURNAL OF COASTAL RESEARCH
(2017)
Article
Marine & Freshwater Biology
Kyung-Hee Oh, Seok Lee, Sok-Kuh Kang, Kyu-Min Song
OCEAN SCIENCE JOURNAL
(2017)
Article
Oceanography
Jae-Hyoung Park, SungHyun Nam
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2018)
Article
Multidisciplinary Sciences
Chanhyung Jeon, Jae-Hun Park, Hirohiko Nakamura, Ayako Nishina, Xiao-Hua Zhu, Dong Guk Kim, Hong Sik Min, Sok Kuh Kang, Hanna Na, Naoki Hirose
SCIENTIFIC REPORTS
(2019)
Article
Environmental Sciences
Sok Kuh Kang, Kyeong Ok Kim, Eun Jin Kim, Young Ho Seung, Jae Kwi So
JOURNAL OF COASTAL RESEARCH
(2019)
Article
Geosciences, Multidisciplinary
Jae-Hyoung Park, Da-Eun Yeo, KyungJae Lee, Hojun Lee, Seung-Woo Lee, Suyun Noh, Seongjung Kim, JiYun Shin, Yeon Choi, SungHyun Nam
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geosciences, Multidisciplinary
Minkyoung Kim, Young-Il Kim, Jeomshik Hwang, Ki Young Choi, Chang Joon Kim, Yeongjin Ryu, Ji-Eun Park, Kyung-Ae Park, Jae-Hyoung Park, SungHyun Nam, Negar Haghipour, Timothy Eglinton
FRONTIERS IN EARTH SCIENCE
(2020)
Article
Marine & Freshwater Biology
Gyundo Pak, Jae-Hyoung Park, Seok-Joon Lee, Young-Gyu Park, You-Soon Chang
OCEAN SCIENCE JOURNAL
(2020)
Article
Environmental Sciences
Sung-Hun Kim, Il-Ju Moon, Seong-Hee Won, Hyoun-Woo Kang, Sok Kuh Kang
Summary: The study used a decision-tree algorithm to reduce the predictand variance for tropical cyclones in the western North Pacific, finding that pre-existing ocean thermal structures along the track and the latitude of a tropical cyclone’s position play significant roles in determining its intensity.
Article
Oceanography
F. Azminuddin, D. Jeon, Y. H. Kim, C. J. Jang, J. H. Park
Summary: The study reveals the existence of the Subtropical Deep Countercurrent (STDCC) in the subtropical northwest Pacific, characterized by eastward-flowing deep water currents located between 19 degrees-25 degrees N with a meridional scale of 200-300 km. The STDCC is found below 1,000 m with its core between 1,250 and 2,000 m, deeper than the North Equatorial Undercurrent's density layer, and is closely related to the westward-propagating eddies.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Environmental Sciences
Sok Kuh Kang, M. G. G. Foreman, Kyeong Ok Kim, Eun Jin Kim, Hanna Kim, Hyoun Woo Kang, Eung Kim, Seok Lee, Kyung Tae Jung
Summary: In April 16, 2014, a ship sank accidentally off the southwestern tip of the Korean peninsula, leading to casualties drifting northward. Analysis showed that dominant M2-driven tidal residual currents near the accident area caused the northward scattering pattern observed.
JOURNAL OF COASTAL RESEARCH
(2021)
Article
Ecology
Young-Tae Son, Jae-Hyoung Park, SungHyun Nam
