Article
Geosciences, Multidisciplinary
Murong Qi, Bo Han, Qinghua Yang, Renhao Wu, Changwei Liu, Gong Zhang, Xiaobo Zhang, Haitao Zhou, Jianqiao Chen, Dake Chen
Summary: This study examines the mechanism of the world's strongest quasi-biweekly oscillation (QBWO) in the South China Sea during the summer season. Through analyzing radiation fields, two modes of QBWO are identified with maximum positive irradiance anomalies of 90 W m(-2). The responses of sea surface turbulent heat fluxes to QBWO display different spatial patterns, mainly attributed to surface wind in Mode1 and air-sea thermal contrast in Mode2.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Oceanography
N. Anup, V. Vijith, A. K. Jithin, B. Rohith, P. Amol, P. A. Francis
Summary: This study investigates the variability and sources of Quasi-Biweekly oscillation in coastal sea level along the western boundary of the Bay of Bengal. The study revealed that the strong QB winds found in the northern BoB are one of the forcing factors that excite QB oscillation in sea level in the western BoB. Further analysis using numerical simulations shows that the QB sea level propagating from the equatorial Indian Ocean and QB oscillation generated by strong winds associated with the tropical cyclones formed in the BoB also contribute to QB coastal sea-level fluctuations in this region.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
Michael B. Natoli, Eric D. Maloney
Summary: The study found that the quasi-biweekly oscillation has a significant impact on the precipitation diurnal cycle in the Philippines, mainly by increasing moisture, cloudiness, and westerly winds during the transition to active large-scale convection.
MONTHLY WEATHER REVIEW
(2021)
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
Yicong Xia, Suxiang Yao, Tianle Sun, Ziyi Guo
Summary: Based on the analysis of observation and reanalysis data, this study identifies and analyzes the contributions of different time scales to persistent heavy rainfall events (PHREs) in the middle and lower reaches of the Yangtze River valley (MLYR). The results reveal that prolonged PHREs are dominated by quasi-biweekly precipitation, while normal PHREs depend on synoptic-scale components.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Xiaoqi Li, Ruidan Chen
Summary: The summer daily maximum temperature over South China exhibits a distinct quasi-biweekly oscillation, with three main sources of influence: tropical and mid-high-latitude antiphase coupling QBWO, mid-high latitude influence, and tropical and mid-high-latitude in-phase coupling QBWO. These climate variability signals are important for the prediction of the daily maximum temperature in South China.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
Yang Yang, Kuiping Li, Weidong Yu, Yongcan Zu, Lin Liu
Summary: Using 17 years of in situ buoy observations, this study investigates how sea surface temperature (SST) over the tropical western Pacific Ocean is modulated by the quasi-biweekly oscillation (QBWO) during boreal summer. The findings show that SST evolution lags behind the convection cycle, with the minimum and maximum SST occurring at different phases. Additionally, the study highlights the asymmetry in wind speed and SST between different phases, which is influenced by the background summer state and intraseasonal anomalies associated with El Nino events.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Zhiqing Xu, Ke Fan
Summary: This study investigated the differences in the changes in the quasi-biweekly oscillation (QBWO) intensity over the western North Pacific during the developing late-summer of three super El Nino events. The study found that the late-summer QBWO intensity was enhanced in these three years, with 2015 having the strongest intensity. The differences in the anomalous atmospheric conditions and sea surface temperature anomalies in the northwestern tropical Pacific played a crucial role in the differences in QBWO intensity. Additionally, the warming in the central and eastern North Pacific in 2015 contributed to the strongest QBWO intensity.
ATMOSPHERIC RESEARCH
(2023)
Article
Multidisciplinary Sciences
Eitarou Oka, Shusaku Sugimoto, Fumiaki Kobashi, Hatsumi Nishikawa, Sachie Kanada, Tomoe Nasuno, Ryuichi Kawamura, Masami Nonaka
Summary: In the subtropical North Pacific Ocean, the thickness variation of Subtropical Mode Water (STMW) affects the thermal structure above and has significant impacts on sea surface temperature, upper ocean heat content, and typhoon intensification rate, making it crucial for understanding climate change.
Article
Meteorology & Atmospheric Sciences
Bin Zheng, Ailan Lin, Yanyan Huang
Summary: This study compares and analyzes the spatiotemporal structures of the 10-30-day intraseasonal oscillations associated with multiple persistent rainfall (MPR) and isolated persistent rainfall (IPR) over South China. The results show that the leading phase of low-level moisture and air temperature perturbations is always before the anomalous precipitation. The moisture budget analysis reveals that the difference in moisture tendency between MPR and IPR is mainly due to meridional advection, influenced by higher-latitude disturbances. The low-level temperature anomalies are not the key factor causing the difference between MPR and IPR.
JOURNAL OF CLIMATE
(2023)
Article
Meteorology & Atmospheric Sciences
Julio C. Marin, Bradford S. Barrett, Diana Pozo
Summary: Tornadoes were reported in south-central Chile on 30 and 31 May 2019. High-resolution sensitivity simulations using the WRF model indicated that both topography and sea surface temperatures played important roles in the organization and severity of the storms that generated tornadoes in the region. Warmer sea surface temperatures increased instability and storm intensity, while lower topography weakened wind shear conditions that favored tornadoes.
ATMOSPHERIC RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
Hungjui Yu, Kristen L. Rasmussen, Hung-Chi Kuo
Summary: This study investigates the climatological features of cloud variability on quasi-2-day (Q2D) and diurnal cycle (DC) timescales using high-resolution satellite data from 1998 to 2019. The results show a distinct land-sea contrast in the distributions of Q2D and DC signals, with Q2D being more prominent over tropical ocean basins and land where organized convection is observed, while DC activity mainly occurs over land and mountainous regions. The study also reveals a strong correlation between Q2D variability and sea surface temperature, as well as with the Indian Ocean Dipole (IOD) and El Nino/Southern Oscillation (ENSO) phenomena, providing valuable insights into the global features of mesoscale convective systems.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Environmental Sciences
Bing Yang, Po Hu, Yijun Hou
Summary: Based on analysis of in situ observations, remote sensing, and data, the characteristics of near-inertial waves induced by tropical storm Noul in the South China Sea were studied. It was found that the near-inertial waves were influenced by a southwestward moving anticyclonic eddy and had comparable spectral density with internal tides. The downward propagation of near-inertial energy was concentrated in smaller wavenumber bands and influenced by mesoscale eddies.
Article
Environmental Sciences
Bin He, Fengqin Yan, Fenzhen Su, Vincent Lyne, Jiasheng Tang
Summary: The South China Sea is identified as one of the top global sustainable fisheries concerns. By characterizing the biogeographic zones and predicting fishing activities, the study provides a more accurate and comprehensive database for regulating and managing fishing activities worldwide.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Jun Nie, Jiabei Fang, Xiu-Qun Yang
Summary: This study investigates the evolution characteristics and mechanism of the subseasonal zonal oscillation of the western Pacific subtropical high (WPSH) in 10-25-day period and 25-50-day period, including the convection-circulation interaction and the air-sea interaction. It is found that the westward extension of the WPSH is mainly attributed to the convection-circulation interaction, while the significance of air-sea interaction varies in the two periods.
Article
Geosciences, Multidisciplinary
Yong Wang, Wenwen Xia, Xiaohong Liu, Shaocheng Xie, Wuyin Lin, Qi Tang, Hsi-Yen Ma, Yiquan Jiang, Bin Wang, Guang J. Zhang
Summary: The intensity of rainfall has profound impacts on aerosol burden, with light rain disproportionately controlling it. Improving the representation of convection can reduce the frequency of light rain, leading to an increase in aerosol burden globally.
Article
Meteorology & Atmospheric Sciences
Hongbo Liu, Ruojing Yan, Bin Wang, Guanghua Chen, Jian Ling, Shenming Fu
Summary: The dominant frequency modes of pre-summer extreme precipitation events over South China were studied. It was found that multiscale combined modes of different frequency bands accounted for the majority of the events, with low-frequency disturbances providing favorable background conditions and synoptic-scale disturbances ultimately inducing the extreme precipitation events.
ADVANCES IN ATMOSPHERIC SCIENCES
(2023)
Article
Engineering, Environmental
Wenwen Xia, Yong Wang, Siyu Chen, Jianping Huang, Bin Wang, Guang J. Zhang, Yue Zhang, Xiaohong Liu, Jianmin Ma, Peng Gong, Yiquan Jiang, Mingxuan Wu, Jinkai Xue, Linyi Wei, Tinghan Zhang
Summary: The study found that urban anthropogenic dust emissions have a significant impact on urban air pollution globally, especially exacerbating non-dust pollution in India and northern China. The estimated global total premature mortality due to anthropogenic dust is 0.8 million deaths per year, with more severe effects in populous regions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Jilin Wang, Juanjuan Liu, Bin Wang, Wei Cheng, Jiping Zhang
Summary: This study investigates the applicability of a previously proposed two-step inversion method in emergency response and source control of air pollution. The results show that the new method provides higher estimation accuracy and a more stable performance compared to two other existing algorithms.
ATMOSPHERIC AND OCEANIC SCIENCE LETTERS
(2022)
Article
Meteorology & Atmospheric Sciences
Lan Xu, Wei Cheng, Zhongren Deng, Juanjuan Liu, Bin Wang, Bin Lu, Shudong Wang, Li Dong
Summary: Assimilation of AGRI clear-sky radiance, along with conventional observations, improves the forecast accuracy of extreme rainfall events in Henan, especially for short-duration intense precipitation processes.
ADVANCES IN ATMOSPHERIC SCIENCES
(2023)
Article
Meteorology & Atmospheric Sciences
Yong Wang, Wenwen Xia, Guang J. Zhang, Bin Wang, Guangxing Lin
Summary: This study shows that correcting the rainfall intensity spectrum in global climate models can alter the radiative effects of aerosols and result in an increase in global premature mortality. However, this correction has little impact on anthropogenic aerosol forcing.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Meteorology & Atmospheric Sciences
Tianpei Qiu, Wenyu Huang, Jonathon S. Wright, Zifan Yang, Bin Wang
Summary: This study examines the impacts of wintertime western disturbances (WDs) on precipitation over the southeastern Tibetan Plateau (SETP). It finds that WDs, accompanied by warm temperature anomalies and cold temperature decreases, contribute to wintertime precipitation over the SETP. The intensity of WD-induced precipitation is mainly influenced by WD strength and moist static energy variations, while the size and latitudinal position of the WD play minor roles.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Meteorology & Atmospheric Sciences
Kun Xia, Lijuan Li, Yanli Tang, Bin Wang
Summary: This study investigates the impact of soil freezing-thawing processes on August rainfall in Southern China using a coupled land-atmosphere model. The results suggest that vertical moisture advection and its dynamic component play a crucial role in the long-term trends of August rainfall.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Meteorology & Atmospheric Sciences
Jing Wang, Jing Chen, Yongzhu Liu, Juanjuan Liu, Bin Wang, Xiaoli Li, FaJing Chen, Zhenhua Huo
Summary: In this study, a moist singular vector (MSV) was developed and evaluated through numerical experiments. The results showed that the linearized moist physical processes have an impact on the spread and structure of MSV, and they can improve the prediction performance of rainfall and atmospheric circulation field.
Article
Meteorology & Atmospheric Sciences
Shujun Zhu, Bin Wang, Lin Zhang, Juanjuan Liu, Yongzhu Liu, Jiandong Gong, Shiming Xu, Yong Wang, Wenyu Huang, Li Liu, Yujun He, Xiangjun Wu, Bin Zhao, Fajing Chen
Summary: This study developed an ensemble four-dimensional variational (En4DVar) hybrid data assimilation system and evaluated its performance in terms of analysis quality and forecast skill. The results showed that the En4DVar system has the ability to improve the accuracy of forecasts, mainly due to the flow-dependent ensemble covariance provided by 4DEnVar.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Meteorology & Atmospheric Sciences
Shujun Zhu, Bin Wang, Lin Zhang, Juanjuan Liu, Yongzhu Liu, Jiandong Gong, Shiming Xu, Yong Wang, Wenyu Huang, Li Liu, Yujun He, Xiangju Wu
Summary: A new 4DEnVar data assimilation system is developed based on GRAPES-GFS, which improves the performance of four-dimensional variational data assimilation algorithm through dimension-reduced projection technique and ensemble-sample-based localization method. Experimental results show that the new system has better forecast performance and higher forecast skills.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Meteorology & Atmospheric Sciences
Yujun He, Bin Wang, Lijuan Li, Juanjuan Liu, Yong Wang, Feifei Li
Summary: This study used the DRP-4DVar data assimilation method to make decadal predictions and found that the initialization of sea surface temperatures in the Atlantic and Mediterranean plays a crucial role in predicting Sahel rainfall, and the skill of this prediction system is significantly higher than other systems that only use ocean analysis data.
JOURNAL OF CLIMATE
(2023)
Article
Geosciences, Multidisciplinary
Ming Yin, Yilun Han, Yong Wang, Wenqi Sun, Jianbo Deng, Daoming Wei, Ying Kong, Bin Wang
Summary: All current global climate models (GCMs) only use grid-averaged surface heat fluxes to drive the atmosphere, which leads to simulation biases. To address this issue, researchers propose a novel parameterization scheme that considers the subgrid variations and partitioning of sensible and latent heat fluxes. This scheme is implemented into the NCAR Climate Earth System Model and improves the simulation of precipitation and decreases overestimations in certain regions.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2023)
