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Parameterizations of Boundary Layer Mass Fluxes in High-Wind Conditions for Tropical Cyclone Simulations 热带气旋模拟中大风条件下边界层质量通量的参数化
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-09 DOI: 10.1175/jas-d-23-0086.1
Xiaomin Chen, Frank D. Marks
{"title":"Parameterizations of Boundary Layer Mass Fluxes in High-Wind Conditions for Tropical Cyclone Simulations","authors":"Xiaomin Chen, Frank D. Marks","doi":"10.1175/jas-d-23-0086.1","DOIUrl":"https://doi.org/10.1175/jas-d-23-0086.1","url":null,"abstract":"Abstract Development of accurate planetary boundary layer (PBL) parameterizations in high-wind conditions is crucial for improving tropical cyclone (TC) forecasts. Given that Eddy-Diffusivity Mass-Flux (EDMF)-type PBL schemes are designed for non-hurricane boundary layers, this study examines the uncertainty of MF parameterizations in hurricane conditions by performing three-dimensional idealized simulations. Results show that the surface-driven MF plays a dominant role in the nonlocal turbulent fluxes and is comparable to the magnitude of downgradient momentum fluxes in the middle portion of TC boundary layers outside the radius of maximum wind (RMW); in contrast, the stratocumulus-top-driven MF is comparably negligible and exerts a marginal impact on TC simulations. To represent the impact of vertical wind shear on damping rising thermal plumes, a new approach of tapering surface-driven MF based on the surface stability parameter is proposed, aiming to retain the surface-driven MF only in unstable boundary layers. Compared to a traditional approach of MF tapering based on 10-m wind speeds, the new approach is physically more appealing as both shear and buoyancy forcings are considered and the width of the effective zone responds to diurnal variations of surface buoyancy forcing. Compared to the experiments retaining the original MF components, using either approach of MF tapering can lead to a stronger and more compact inner core due to enhanced boundary layer inflow outside the RMW; nevertheless, the radius of gale-force wind and inflow layer depth are only notably reduced using the new approach. Comparison to observations and further discussions on MF parameterizations in high-wind conditions are provided.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"133 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135242996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanisms of Low-Level Jet Formation in the U.S. Mid-Atlantic Offshore 美国中大西洋近海低空急流形成机制
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-09 DOI: 10.1175/jas-d-23-0079.1
Emily de Jong, Eliot Quon, Shashank Yellapantula
{"title":"Mechanisms of Low-Level Jet Formation in the U.S. Mid-Atlantic Offshore","authors":"Emily de Jong, Eliot Quon, Shashank Yellapantula","doi":"10.1175/jas-d-23-0079.1","DOIUrl":"https://doi.org/10.1175/jas-d-23-0079.1","url":null,"abstract":"Abstract Low-level jets (LLJs), in which the wind speed attains a local maximum at low altitudes, have been found to occur in the U.S. mid-Atlantic offshore, a region of active wind energy deployment as of 2023. In contrast to widely studied regions such as the U.S. Southern Great Plains and the California coastline, the mechanisms that underlie LLJs in the U.S. mid-Atlantic are poorly understood. This work analyzes floating lidar data from buoys deployed in the New York Bight to understand the characteristics and causes of coastal LLJs in the region. Application of the Hilbert–Huang Transform, a frequency analysis technique, to LLJ case studies reveals that mid-Atlantic jets frequently occur during times of adjustment in synoptic-scale motions, such as large-scale temperature and pressure gradients or frontal passages, and that they do not coincide with motions at the native inertial oscillation frequency. Subsequent analysis with theoretical models of inertial oscillation and thermal winds further reveals that these jets can form in the stationary geostrophic wind profile from horizontal temperature gradients alone—in contrast to cganonical LLJs, which arise from low-level inertial motions. Here, inertial oscillation can further modulate the intensity and altitude of the wind speed maximum. Statistical evidence indicates that these oscillations arise from stable stratification and the associated frictional decoupling due to warmer air flowing over a cold sea surface during the springtime land–sea breeze. These results improve our conceptual understanding of mid-Atlantic jets and may be used to better predict low-level wind speed maxima.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":" 19","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135241450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influences of cloud vertical overlapping on the calculated cloud albedo and their validation with satellite observations 云垂直重叠对计算云反照率的影响及其与卫星观测的验证
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-08 DOI: 10.1175/jas-d-22-0219.1
Hua Zhang, Haibo Wang, Yangang Liu, Xianwen Jing, Yi Liu
{"title":"Influences of cloud vertical overlapping on the calculated cloud albedo and their validation with satellite observations","authors":"Hua Zhang, Haibo Wang, Yangang Liu, Xianwen Jing, Yi Liu","doi":"10.1175/jas-d-22-0219.1","DOIUrl":"https://doi.org/10.1175/jas-d-22-0219.1","url":null,"abstract":"Abstract Cloud albedo is expected to influence cloud radiative forcing in addition to cloud fraction, and inadequate description of the cloud overlapping effects on the cloud fraction may influence the simulated cloud fraction, and thus the relative cloud radiative forcing (RCRF) and cloud albedo. In this study, we first present a new formula by extending that presented previously in Liu et al. (2011) to consider multilayer clouds directly in the relationship between cloud albedo, cloud fraction and RCRF, and then quantitatively evaluate the effects of different cloud vertical overlapping structures, represented by the decorrelation length scales ( L cf ), on the simulated cloud albedos. We use the BCC_AGCM2.0_CUACE/Aero model with simultaneous validation by observations from the Clouds and the Earth's Radiation Energy System (CERES) satellite. When L cf < 4 km (i.e., the cloud overlap is closer to the random overlap), the simulated cloud albedos are generally in good agreement with the satellite-based albedos for December–February and June–August; when L cf ≥ 4 km (i.e., the cloud vertical overlap is closer to the maximum overlap), the difference between simulated and observed cloud albedos became larger, due mainly to significant differences in cloud fractions and RCRF. Further quantitative analysis shows that the relative Euclidean distance, which represents the degree of overall model–observation disagreement, increases with the L cf for all three variables (cloud albedo, cloud fraction and RCRF), indicating the importance of cloud vertical overlapping in determining the accuracy of the calculated cloud albedo for multilayer clouds.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"116 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Balanced Convective Circulations in a Stratified Atmosphere. Part I: A Framework for Assessing Radiation, the Coriolis Force, and Drag 分层大气中平衡的对流环流。第一部分:评估辐射、科里奥利力和阻力的框架
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-08 DOI: 10.1175/jas-d-22-0254.1
David H. Marsico, Joseph A. Biello, Matthew R. Igel
{"title":"Balanced Convective Circulations in a Stratified Atmosphere. Part I: A Framework for Assessing Radiation, the Coriolis Force, and Drag","authors":"David H. Marsico, Joseph A. Biello, Matthew R. Igel","doi":"10.1175/jas-d-22-0254.1","DOIUrl":"https://doi.org/10.1175/jas-d-22-0254.1","url":null,"abstract":"Abstract The so-called traditional approximation, wherein the component of the Coriolis force proportional to the cosine of latitude is ignored, is frequently made in order to simplify the equations of atmospheric circulation. For velocity fields whose vertical component is comparable to their horizontal component (such as convective circulations), and in the tropics where the sine of latitude vanishes, the traditional approximation is not justified. We introduce a framework for studying the effect of diabatic heating on circulations in the presence of both traditional and non-traditional terms in the Coriolis force. The framework is intended to describe steady convective circulations on an f-plane in the presence of radiation and momentum damping. We derive a single elliptic equation for the horizontal velocity potential, which is a generalization of the weak temperature Gradient (WTG) approximation. The elliptic operator depends on latitude, radiative damping, and momentum damping coefficients. We show how all other dynamical fields can be diagnosed from this velocity potential; the horizontal velocity induced by the Coriolis force has a particularly simple expression in terms of the velocity potential. Limiting examples occur at the equator, where only the non-traditional terms are present, at the poles, where only the traditional terms appear, and in the absence of radiative damping where the WTG approximation is recovered. We discuss how the framework will be used to construct dynamical, nonlinear convective models, in order to diagnose their consequent upscale momentum and temperature fluxes.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"106 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135341958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Atmosphere-Ocean Coupled Energy Budgets of Tropical Convective Discharge-Recharge Cycles 热带对流放电-补给循环的大气-海洋耦合能量收支
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-02 DOI: 10.1175/jas-d-23-0061.1
Brandon Wolding, Adam Rydbeck, Juliana Dias, Fiaz Ahmed, Maria Gehne, George Kiladis, Emily M. Riley Dellaripa, Xingchao Chen, Isabel L. McCoy
{"title":"Atmosphere-Ocean Coupled Energy Budgets of Tropical Convective Discharge-Recharge Cycles","authors":"Brandon Wolding, Adam Rydbeck, Juliana Dias, Fiaz Ahmed, Maria Gehne, George Kiladis, Emily M. Riley Dellaripa, Xingchao Chen, Isabel L. McCoy","doi":"10.1175/jas-d-23-0061.1","DOIUrl":"https://doi.org/10.1175/jas-d-23-0061.1","url":null,"abstract":"Abstract An energy budget combining atmospheric moist static energy (MSE) and upper ocean heat content (OHC) is used to examine the processes impacting day-to-day convective variability in the tropical Indian and western Pacific oceans. Feedbacks arising from atmospheric and oceanic transport processes, surface fluxes, and radiation drive the cyclical amplification and decay of convection around suppressed and enhanced convective equilibrium states, referred to as shallow and deep convective discharge-recharge (D-R) cycles respectively. The shallow convective D-R cycle is characterized by alternating enhancements of shallow cumulus and stratocumulus, often in the presence of extensive cirrus clouds. The deep convective D-R cycle is characterized by sequential increases in shallow cumulus, congestus, narrow deep precipitation, wide deep precipitation, a mix of detached anvil and alto-stratus and alto-cumulus, and once again shallow cumulus cloud types. Transitions from the shallow to deep D-R cycle are favored by a positive “column process” feedback, while discharge of convective instability and OHC by mesoscale convective systems (MCSs) contributes to transitions from the deep to shallow D-R cycle. Variability in the processes impacting MSE is comparable in magnitude to, but considerably more balanced than, variability in the processes impacting OHC. Variations in the quantity of atmosphere-ocean coupled static energy (MSE+OHC) result primarily from atmospheric and oceanic transport processes, but are mainly realized as changes in OHC. MCSs are unique in their ability to rapidly discharge both lower tropospheric convective instability and OHC.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"8 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135973250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
AMS Publications Support for Open, Transparent, and Equitable Research AMS出版物支持开放、透明和公平的研究
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-01 DOI: 10.1175/jas-d-23-0158.1
Douglas Schuster, Michael Friedman
{"title":"AMS Publications Support for Open, Transparent, and Equitable Research","authors":"Douglas Schuster, Michael Friedman","doi":"10.1175/jas-d-23-0158.1","DOIUrl":"https://doi.org/10.1175/jas-d-23-0158.1","url":null,"abstract":"© 2023 American Meteorological Society. This published article is licensed under the terms of the default AMS reuse license. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"202 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
TC Worlds in a Three-Level Model 三级模型中的TC世界
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-01 DOI: 10.1175/jas-d-22-0089.1
Stephen T. Garner
{"title":"TC Worlds in a Three-Level Model","authors":"Stephen T. Garner","doi":"10.1175/jas-d-22-0089.1","DOIUrl":"https://doi.org/10.1175/jas-d-22-0089.1","url":null,"abstract":"Abstract Three-level and thee-layer models of tropical cyclones (TCs) have provided a more conceptual view of TC dynamics than conventional numerical models. They have been purpose-built, with special treatments of boundary layers and/or convection. We show that a further simplification with minimal parameterization and a seamless connection to higher resolution captures TCs about as well. The framework of radiative–convective equilibrium avoids ambiguities from temporal and spatial boundaries. For the TCs, the minimal grid provides one level for outflow and one level for most of the inflow. A version with 10 levels is used for comparison. For the same average pressure intensity, the wind field is slightly broader around the three-level vortices, with stronger subsidence in the core and 25% more mass and moisture flux. However, thermodynamic efficiency, mechanical efficiency, and TC counts are about the same. Across runs with different surface temperatures and cooling rates, global energy scaling makes reasonable predictions of the maximum velocity allowing for variations in the effective forcing/dissipation area and surface humidity. TC count is inconsistent with theories for size as a function of Coriolis parameter. An overturning circuit is isolated within a composite vortex and analyzed using energy and entropy budgets to mirror analytical models. Effective radiation and dissipation temperatures are less extreme than often assumed in such models, yielding a smaller thermodynamic efficiency near the global value of ∼0.1. The pressure deficit arises mostly from inflow enthalpy increase, as expected, but dissipation reduces the contribution from an outflow pressure increase. The influence of ambient CAPE makes up most of the difference.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"140 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sensitivity of Banner Cloud Formation to Orography and the Ambient Atmosphere: Transition From Idealized to More Realistic Scenarios 旗云形成对地形和周围大气的敏感性:从理想化到更现实的情景过渡
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-01 DOI: 10.1175/jas-d-23-0106.1
Marius Levin Thomas, Volkmar Wirth
{"title":"Sensitivity of Banner Cloud Formation to Orography and the Ambient Atmosphere: Transition From Idealized to More Realistic Scenarios","authors":"Marius Levin Thomas, Volkmar Wirth","doi":"10.1175/jas-d-23-0106.1","DOIUrl":"https://doi.org/10.1175/jas-d-23-0106.1","url":null,"abstract":"Abstract Banner clouds are clouds in the lee of steep mountains or sharp ridges on otherwise cloud-free days. Previous studies investigated various aspects of banner cloud formation in numerical simulations, most of which were based on idealized orography and a neutrally stratified ambient atmosphere. The present study extends these simulations in two important directions by 1) examining the impact of various types of orography ranging from an idealized pyramid to the realistic orography of Mount Matterhorn and 2) accounting for an ambient atmosphere that turns from neutral to stably stratified below the mountain summit. Not surprisingly, realistic orography introduces asymmetries in the spanwise direction. At the same time, banner cloud occurrence remains associated with a coherent area of strong uplift, although this region does not have to be located exclusively in the lee of the mountain any longer. In the case of Mount Matterhorn with a westerly ambient flow, a large fraction of air parcels rises along the southern face of the mountain, before they reach the lee and are lifted into the banner cloud. The presence of a shallow boundary layer with its top below the mountain summit introduces more complex behavior compared to a neutrally stratified boundary layer; in particular, it introduces a dependence on wind speed, because strong wind is associated with strong turbulence that is able to raise the boundary layer height and, thus, facilitates the formation of a banner cloud.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"6 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134995898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Observations of boundary-layer convergence lines and associated updrafts in the US Southern Great Plains 美国南部大平原边界层辐合线及相关上升气流的观测
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-11-01 DOI: 10.1175/jas-d-23-0089.1
Shanhe Liu, Kapil D. Sindhu, Daniel J. Kirshbaum
{"title":"Observations of boundary-layer convergence lines and associated updrafts in the US Southern Great Plains","authors":"Shanhe Liu, Kapil D. Sindhu, Daniel J. Kirshbaum","doi":"10.1175/jas-d-23-0089.1","DOIUrl":"https://doi.org/10.1175/jas-d-23-0089.1","url":null,"abstract":"Abstract Boundary-layer convergence lines (CLs) are highly effective at deep-convection initiation (DCI), suggesting that their associated updraft properties differ from those of more widespread turbulent updrafts in the planetary boundary layer (PBL). This study exploits observations at the Atmospheric Radiation Measurement Southern Great Plains (ARM-SGP) observatory in Oklahoma from 2011-2016 to quantify CL properties and their relation to turbulent PBL eddies preceding CL arrival. Two independent methods for estimating CL properties are developed at two locations in the SGP region, both relying on the assumption of a 2D circulation in the CL-normal plane but using different combinations of instruments. The first (the radar method) relies mainly on scanning radar data and is applied to 61 CLs passing near a high-resolution scanning radar based in Nardin, OK, while the second (the surface method) relies mainly on surface wind data and is applied to 68 CLs crossing the SGP facility in nearby Lamont, OK. Mean daytime (10:00-19:00 LST) CL width (∼2 km) and convergence magnitude (∼0.003 s−1) are similar for both methods, and mean daytime CL depth is ∼ 0.75 km. The two methods disagree at night (00:00-10:00 LST and 19:00-24:00 LST), where the surface method estimates wider and weaker CLs than the radar method. This difference may stem from the radar beam overshooting the shallow, highly stable nocturnal PBL. The largest CL updrafts are slightly wider (∼ 20%) and stronger (∼ 40%) than the largest PBL updrafts in the pre-CL period, generating 50-100% larger updraft mass fluxes over most of the PBL depth.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"76 11-12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135272612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantifying the environmental effects on tropical cyclone intensity change using a simple dynamically based dynamical system model 用简单的基于动态的动力系统模型量化环境对热带气旋强度变化的影响
3区 地球科学
Journal of the Atmospheric Sciences Pub Date : 2023-10-31 DOI: 10.1175/jas-d-23-0058.1
Jing Xu, Yuqing Wang, Chi Yang
{"title":"Quantifying the environmental effects on tropical cyclone intensity change using a simple dynamically based dynamical system model","authors":"Jing Xu, Yuqing Wang, Chi Yang","doi":"10.1175/jas-d-23-0058.1","DOIUrl":"https://doi.org/10.1175/jas-d-23-0058.1","url":null,"abstract":"Abstract Accurate prediction of tropical cyclone (TC) intensity is quite challenging due to multiple competing processes among the TC internal dynamics and the environment. Most previous studies have evaluated the environmental effects on TC intensity change from both internal dynamics and external influence. This study quantifies the environmental effects on TC intensity change using a simple dynamically based dynamical system (DBDS) model recently developed. In this simple model, the environmental effects are uniquely represented by a ventilation parameter B , which can be expressed as multiplicative of individual ventilation parameters of the corresponding environmental effects. Their individual ventilation parameters imply their relative importance to the bulk environmental ventilation effect and thus to the TC intensity change. Six environmental factors known to affect TC intensity change are evaluated in the DBDS model using machine learning approaches with the best-track data for TCs over the North Atlantic, central, eastern and western North Pacific and the statistical hurricane intensity prediction scheme (SHIPS) dataset during 1982–2021. Results show that the deep-layer vertical wind shear (VWS) is the dominant ventilation factor to reduce the intrinsic TC intensification rate or to drive the TC weakening, with its ventilation parameter ranging between 0.5–0.8 when environmental VWS between 200 and 850 hPa is larger than 8 m s −1 . Other environmental factors are generally secondary, with their respective ventilation parameters over 0.8. An interesting result is the strong dependence of the environmental effects on the stage of TC development.","PeriodicalId":17231,"journal":{"name":"Journal of the Atmospheric Sciences","volume":"123 20","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135813243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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