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13 results for “eyewall”
Supplemental Data for "Eyewall Asymmetries and Their Contributions to the Intensification of an Idealized Tropical Cyclone Translating in Uniform Flow"
<p>The repository contains a set of files required to reproduce the idealized tropical cyclone simulation analyzed in the manuscript entitled "Eyewall asymmetries and their contributions to the intensification of an idealized tropical cyclone translating in uniform flow", submitted to the Journal of the Atmospheric Sciences. See the README file for brief descriptions about the content of each file within this repository.</p> <p>The simulation was produced with the Cloud Model 1 (CM1) version 19.7, and CM1 can be downloaded at https://www2.mmm.ucar.edu/people/bryan/cm1/. </p>
Supplemental Data for "The Sensitivity of Eyewall Replacement Cycles to Shortwave Radiation"
<p>The repository contains files to reproduce the simulations and analyses described in the manuscript "The Sensitivity of Eyewall Replacement Cycles to Shortwave Radiation" which has been published in the Journal of Geophysical Research: Atmospheres and can be found at <a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JD034016">https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JD034016</a>. Model configuration can also be found at <a href="https://doi.org/10.1175/JAS-D-18-0165.1">https://doi.org/10.1175/JAS-D-18-0165.1</a></p> <p> </p> <p><strong>Includes</strong></p> <p>input_sounding ----- Initial thermodynamic profile to initialize WRF</p> <p>namelist.input ----- Set of input parameters to run WRF</p> <p>wrfrst_* ----- WRF restart files for the 3 domains for two times (July 7 (96h restart) and July 5 (48h restart)</p> <p> </p>
Data from: Documenting the progressions of secondary eyewall formations
<p>Intense tropical cyclones can form secondary eyewalls (SEs) that contract towards the storm center and eventually replace the inner eyewall, a process known as an eyewall replacement cycle (ERC). However, SE formation does not guarantee an eventual ERC, and often, SEs follow differing evolutionary pathways. This study documents SE evolution and progressions observed in numerous tropical cyclones, and results in two new datasets using passive microwave imagery: a global subjectively labeled dataset of SEs and eyes and their uncertainties from 72 storms between 2016–19, and a dataset of 87 SE progressions that highlights the broad convective organization preceding and following a SE formation.</p> <p>The results show two primary SE pathways exist, No Replacement, known as Path 1, and Replacement, known as the Classic Path. Most interestingly, 53% of the most certain SE formations result in an eyewall replacement. The Classic Path is associated with stronger column average meridional wind, a faster poleward component of storm motion, more intense storms, weaker vertical wind shear, greater relative humidity, a larger storm wind field, and stronger cold air advection.</p> <p>This study highlights a greater number of potential SE pathways exist than previously thought. The results of this study detail several observational features of SE evolution that raise questions regarding the physical processes driving SE formations. Most importantly, environmental conditions and storm metrics identified here provide guidance for predictors in artificial intelligence applications for future tropical cyclone SE detection algorithms.</p>
Driving Forces of Extreme Updrafts Associated with Convective Bursts in the Eyewall of a Simulated Tropical Cyclone
<p>The model-simulated data used in this study are uploaded here. Due to the large number, the original simulation data are available on request (qnn_nancy@yahoo.com).</p>
The Maintenance of Long-Lived Concentric Eyewall in Simulated Typhoon Lekima (2019)
<p>The model-simulated data used in this study are uploaded here. Due to the large number, the original simulation data are available on request (qnn_nancy@yahoo.com).</p>
Data from: Barotropic instability during eyewall replacement
<div> <div>Prior to landfall in Puerto Rico, Hurricane Maria (2017) underwent an eyewall replacement cycle. The National Oceanic and Atmospheric Administration (NOAA) San Juan (TJUA) radar captured a robust outer convective ring with an inner ring first distorted into an ellipse and then disintegrated. To understand the dynamical processes during eyewall replacement, this work interprets the eyewall replacement event using the non-divergent barotopic model with a linear stability analysis and non-linear numerical simulations. For the linear stability analysis, the model's axisymmetric basic state vorticity distribution is piece-wise uniform in five regions: eye, inner eyewall, moat, outer eyewall, and far field. The stability of such structures is investigated by solving a simple eigenvalue/eigenvector problem. For the non-linear model, the evolution into a more stable structure is simulated using the non-linear barotropic model. Three types of instability and vorticity rearrangement are identified: (1) instability across the outer ring of enhanced vorticity, (2) instability across the low vorticity moat, and (3) instability across the inner ring of enhanced vorticity. This dataset includes (1) a loop of the NOAA TJUA radar during the landfall of Hurricane Maria (2017) in GIF format to show the convective evolution, (2) the output from the five-region linear stability analysis in NetCDF format, and (3) the output from the non-divergent barotropic model in NetCDF format and GIF format to show the vortex evolution. These data are provided without restrictions for further exploration into understanding barotropic instability during eyewall replacement.</div> </div>
Data from: Documenting the progressions of secondary eyewall formations
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Data from: Barotropic instability during eyewall replacement
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The roles of moat width and outer eyewall contraction in affecting the timescale of eyewall replacement cycle
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Data from: The role of outflow-layer inertial stability in governing the radial location of secondary eyewall formation in tropical cyclones
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Stronger Vertical Wind Shear Leads to Earlier Secondary Eyewall Formation
<p>file1(s100_azimuthal_uvrd.d) : S100's u、v wind and reflectivity </p> <p>fie2(s100_chi_vr.d): S100's the irrotational component of the radial velocity</p> <p>file3(s125_azimuthal_saturation_deficit.d): S125's column-integrated saturation deficit </p>
Radar Observations of Convective Processes Associated with Eyewall Formation during the Rapid Intensification of Typhoon Cempaka (2021)
<p>Dataset for Radar Observations of Convective Processes Associated with Eyewall Formation during the Rapid Intensification of Typhoon Cempaka (2021)</p>
Tropical Cyclone Secondary Eyewall Formation in Environmental Helicity
<p>original dataset</p>
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