A5017083443- Tropical and Extratropical Cyclones Research
- Ocean Waves and Remote Sensing
- Meteorological Phenomena and Simulations
- Climate variability and models
- Arctic and Antarctic ice dynamics
- Muscle activation and electromyography studies
- Neuroscience and Neural Engineering
- Methane Hydrates and Related Phenomena
- Astronomical Observations and Instrumentation
- High Altitude and Hypoxia
- Flood Risk Assessment and Management
- Coastal and Marine Dynamics
- Advanced Cellulose Research Studies
- EEG and Brain-Computer Interfaces
- Atmospheric and Environmental Gas Dynamics
- Marine Bivalve and Aquaculture Studies
- Advanced Sensor and Energy Harvesting Materials
- Metallurgical Processes and Thermodynamics
- Marine Ecology and Invasive Species
- Cryospheric studies and observations
- Metallurgy and Material Forming
- Planarian Biology and Electrostimulation
- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Nanocomposite Films for Food Packaging
University of Bergen
2022-2025
Bjerknes Centre for Climate Research
2022-2025
Ningbo University
2024
Colorado State University
2019-2023
Pennsylvania State University
2012-2019
Chongqing University of Technology
2019
Jiangnan University
2013-2017
Harbin Institute of Technology
2011-2012
Shenzhen Institutes of Advanced Technology
2011
Chinese Academy of Sciences
2011
Abstract Through cloud-resolving simulations, this study examines the effect of vertical wind shear and system-scale flow asymmetry on predictability tropical cyclone (TC) intensity during different stages TC life cycle. A series ensemble experiments is performed with varying magnitudes shear, each initialized an idealized weak TC-like vortex, small-scale, small-amplitude random perturbations added to initial conditions. It found that environmental can significantly affect intrinsic...
Abstract The formation and predictability of sheared tropical cyclones (TCs) are explored through a series convection‐permitting ensemble simulations using the Weather Research Forecasting (WRF) model with different environmental vertical wind shear, sea‐surface temperature (SST), ambient moisture conditions. Small‐amplitude random perturbations introduced in lower troposphere as initial‐condition uncertainties to generate ensembles under conditions; composites each analyzed this study...
Abstract The effects of environmental shear on the dynamics and predictability tropical cyclones (TCs) are further explored through a series cloud‐permitting ensemble sensitivity experiments with small, random initial condition perturbations low‐level moisture fields. As an expansion earlier studies, it is found that larger magnitude, less predictable TCs, especially onset time rapid intensification (RI), until too large for TC formation. Systematic differences amongst members begin to arise...
Abstract This study examines the predictability and dynamics of tropical cyclone (TC) secondary eyewall formation (SEF), replacement cycles (ERC), intensity changes under moderate environmental shear through convection‐permitting ensemble simulations. Even with same shear, TC during formation, rapid intensification, SEF/ERC can be extremely sensitive to small, unobservable, random initial condition uncertainties, or computer's truncation error due chaotic nature moist convection. Through...
Abstract. While Arctic amplification is a robust feature of both observed and projected climate change, projections change are characterized by substantial uncertainty. To better understand the drivers this uncertainty, we performed coordinated set fully coupled experiments with second version Norwegian Earth System Model (NorESM2) in which selected processes key importance for have been modified. They include improved representation (1) mixed-phase clouds, (2) eddy upper ocean, (3)...
Abstract Cyclones at polar latitudes of the Atlantic‐Arctic corridor exhibit different thermodynamic characteristics. Midlatitude‐origin cyclones, which make up about 14% wintertime cyclones in region, are generally warm and moist. The more numerous Arctic‐origin display a wide range boundary‐layer equivalent potential temperature that depends on both moisture. This spread includes large positive negative anomalies, leading to weak signals composite means. Warm/moist (high‐) associated with...
Abstract This study explores the spatial and temporal changes in tropical cyclone (TC) thermodynamic dynamic structures before, near, during rapid intensification (RI) under different vertical wind shear conditions through four sets of convection-permitting ensemble simulations. A composite analysis TC structural evolution is performed by matching RI onset time each member. Without background flow, axisymmetric undergoes a gradual strengthening inner-core vorticity warm core throughout...
Electromyography (EMG) signals are commonly recorded using the Ag/AgCl gel electrodes in myoelectric prosthetic control. While a gelled electrode may provide high-quality EMG recordings, it is inconvenient clinical application of prosthesis. A novel type signal sensors-textile should be ideal control prostheses. However, unknown whether performance textile comparable to used classifying arm movements. In this study, custom-made bipolar were fabricated copper-based nickel-plated conductive...
Abstract. Abrupt changes in ocean biogeochemical variables occur as a result of human-induced climate forcing well those which are more gradual and over longer timescales. These abrupt have not yet been identified quantified to the same extent ones. We review synthesise biogeochemistry under climatic forcing. specifically address carbon oxygen cycles because related processes acidification deoxygenation provide important ecosystem hazards. Since depend also on physical environment, we...
Abstract The existence of physical solutions for the gradient wind balance is examined at top 12 simulated tropical cyclones. pressure field these storms, which depends on vertically integrated effect warm core and near surface low, found to violate balance—termed here as a state nonbalance. Using toy model, it shown that slight changes in relative location widths drastically increase isobaric curvature upper level maps leading While idealized storms return within several days, simulations...
This contribution summarizes the significant progress in a variety of topic areas related to internal tropical cyclone (TC) intensity change processes over 2018–2022 from WMO Tenth International Workshop on Tropical Cyclones (IWTC-10). These include surface and boundary layer processes; TC structure microphysical and, radiation interactions with TCs. Recent studies better frame uncertainty drag enthalpy coefficients at high wind speeds. parameters greatly impact it is therefore important...
Hurricane Patricia (2015) over the eastern Pacific was a record-breaking tropical cyclone (TC) under very favorable environment during its rapid intensification (RI) period, which makes it an optimal real case for studying RI dynamics and predictability. In this study, we performed ensemble Kalman filter analyses at Patricia's early development stage using both traditional observations Office of Naval Research Tropical Cyclone Intensity (TCI) field campaign data. It is shown that...
Abstract This study explores the dynamics and predictability of rapid intensification (RI) Super Typhoon Usagi (2013) through a 60‐member convection‐permitting ensemble using Weather Research Forecasting (WRF) model an Kalman filter (EnKF) data assimilation method. The surface maximum wind speed Usagi, which was intense category 4 western North Pacific tropical cyclone (TC), increased by 33 m s −1 over 24‐hr period. RI process captured WRF simulation initialized with global analysis but...
Abstract In this study w e explored why the different initial tropical cyclone structures can result in steady‐state maximum intensities model simulations with same environmental conditions. We discovered a linear relationsh ip between radius of wind ( r m ) and absolute angular momentum that passes through M simulated cyclones = aM + b . This nonnegligible intercept is found to be key making storm larger more intense. The sensitivity experiments show nonzero results mainly from horizontal...
Abstract The combination of moderate vertical wind shear (VWS) and dry environments can produce the most uncertain scenarios for tropical cyclone (TC) genesis intensification. We investigated sources increased uncertainty TC development under VWS using a set Weather Research Forecasting (WRF) ensemble simulations. Statistical analysis members precursor events time-lagged correlations indicates that successful is dependent on specific events. A deficiency in any these leads to failure...
Abstract The criteria and assumptions that were used to derive the steady-state tropical cyclone intensity structure theory of Emanuel Rotunno are assessed using three-dimensional convection-allowing simulations Weather Research Forecasting Model. One real-data case Hurricane Patricia (2015) two idealized with without vertical wind shear examined. In all three simulations, gradient balance is valid in inner-core region above boundary layer. angular momentum M saturation entropy surfaces s*...
Abstract This study revisits the axisymmetric tropical cyclone (TC) theory from D. K. Lilly’s unpublished manuscript (Lilly model) and compares it to TC simulations a nonhydrostatic cloud model. Analytic solutions of Lilly model are presented through simplifying assumptions. Sensitivity experiments varying sea surface, boundary layer tropopause temperatures, absolute angular momentum ( M ) at some outer radius in show that these variations influence radial structure tangential wind profile V...
Textile electrode is flexible, folding, washable and biocompatible with skin. With these advantages, the textile electrodes should be an ideal alternative for electromyogram (EMG) recordings in clinical applications. In this study, a system was used EMG signal its usability performance classifying different arm hand movements were evaluated through real-time pattern recognition control of virtual myoelectric arm. Our results showed that offline average classification accuracy over seven...
Abstract Intensity and size are important to characterize a tropical cyclone (TC), but there wide variety of ways that both metrics defined. TC intensity can refer either maximum sustained wind speed at some height level or central surface pressure minimum, may the radius wind, gale force be based on other criteria. While different definitions have useful applications, varying amounts redundant information covariations between variables make investigating physical relationships more...