Boundary-Layer Meteorology最新文献_第3页

Uncertainties of Drag Coefficient Estimates Above Sea Ice from Field Data 从实地数据估算海冰上阻力系数的不确定性

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-02-14 DOI: 10.1007/s10546-023-00851-9

Sébastien Blein, Virginie Guemas, Ian M. Brooks, Andrew D. Elvidge, Ian A. Renfrew

{"title":"Uncertainties of Drag Coefficient Estimates Above Sea Ice from Field Data","authors":"Sébastien Blein, Virginie Guemas, Ian M. Brooks, Andrew D. Elvidge, Ian A. Renfrew","doi":"10.1007/s10546-023-00851-9","DOIUrl":"https://doi.org/10.1007/s10546-023-00851-9","url":null,"abstract":"Surface turbulent exchanges play a key role on sea ice dynamics, on ocean and sea ice heat budgets and on the polar atmosphere. Uncertainties in parameterizations of surface turbulent fluxes are mostly held by the transfer coefficients and estimates of those transfer coefficients from field data are required for parameterization development. Measurement errors propagate through the computation of transfer coefficients and contribute to its total error together with the uncertainties in the empirical stability functions used to correct for stability effects. Here we propose a methodology to assess their contributions individually to each coefficient estimate as well as the total drag coefficient uncertainty and we apply this methodology on the example of the SHEBA campaign. We conclude that for most common drag coefficient values (between (1.0times 10^{-3}) and (2.5times 10^{-3})), the relative total uncertainty ranges from 25 and 50(%). For stable or unstable conditions with a stability parameter (|zeta |>1) on average, the total uncertainty in the neutral drag coefficient exceeds the neutral drag coefficient value itself, while for (|zeta |<1) the total uncertainty is around 25(%) of the drag coefficient. For closer-to-neutral conditions, this uncertainty is dominated by measurement uncertainties in surface turbulent momentum fluxes which should therefore be the target of efforts in uncertainty reduction. We also propose an objective data-screening procedure for field data, which consists of retaining data for which the relative error on neutral drag coefficient does not exceed a given threshold. This method, in addition to the commonly used flux quality control procedure, allows for a reduction of the drag coefficient dispersion compared to other data-screening methods, which we take as an indication of better dataset quality.\u0000","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"30 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139766126","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

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-02-04 DOI: 10.1007/s10546-023-00854-6

G. H. Urbancic, I. Stiperski, A. A. M. Holtslag, S. Mosso, T. Vihma

{"title":"A Novel Similarity Approach for Describing the Bulk Shear in the Atmospheric Surface Layer","authors":"G. H. Urbancic, I. Stiperski, A. A. M. Holtslag, S. Mosso, T. Vihma","doi":"10.1007/s10546-023-00854-6","DOIUrl":"https://doi.org/10.1007/s10546-023-00854-6","url":null,"abstract":"The Monin–Obukhov Similarity Theory (MOST) is a cornerstone of boundary layer meteorology and the basis of most parameterizations of the atmospheric surface layer. Due to its significance for observations and modelling, we generalize the dimensional analysis of MOST by considering the bulk gradient directly, enabling the study of any sublayer of the atmospheric surface layer. This results in a family of similarity relations describing all gradients from the local gradient to the full-layer bulk gradient. By applying the profiles derived from the law-of-the-wall and MOST, we are able to derive analytic expressions for this family of similarity relations. Under stable conditions, we discover that the log-linear profile of Businger–Dyer generalizes from the local to the bulk shear where the slope is dependent on the choice of the layer. The simplicity of the general log-linear relation allows for estimating the influence of stability on the non-dimensional gradients. It is shown that bulk gradients are less sensitive to stability than the local gradient. By correctly filtering cases where the full-layer bulk gradient is influenced by stability, we demonstrate that MOST is compatible with the Hockey-Stick Transition. For unstable conditions, the Kader and Yaglom (J Fluid Mech 212(151):637-662, 1990) model represents the local gradient well but was not successful in representing the bulk gradient, demonstrating the need for further analysis of scaling relations for the unstable atmospheric surface layer.\u0000","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"33 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139678933","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

Assessing the Internal Variability of Large-Eddy Simulations for Microscale Pollutant Dispersion Prediction in an Idealized Urban Environment 评估理想化城市环境中用于微尺度污染物扩散预测的大型埃迪模拟的内部可变性

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-27 DOI: 10.1007/s10546-023-00853-7

引用次数: 0

Quantification of Approaching Wind Uncertainty in Flow over Realistic Plant Canopies 逼近风力的不确定性在流经真实植物顶篷时的量化

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-27 DOI: 10.1007/s10546-023-00848-4

Beatrice Giacomini, Marco G. Giometto

{"title":"Quantification of Approaching Wind Uncertainty in Flow over Realistic Plant Canopies","authors":"Beatrice Giacomini, Marco G. Giometto","doi":"10.1007/s10546-023-00848-4","DOIUrl":"https://doi.org/10.1007/s10546-023-00848-4","url":null,"abstract":"Numerical simulations and in-situ measurements represent two important and synergistic pillars for the study of flow and transport in plant canopies. Due to model limitations and parameter uncertainty, the alignment of model predictions with actual observations is challenging in practice. The present work proposes a Bayesian uncertainty quantification (UQ) framework that estimates the approaching wind angle parameter for large-eddy simulation (LES) of flow in plant canopies by assimilating data from in-situ measurements. The framework is applied to LES of flow within and above realistic plant canopy, with plant area density derived from light detection and ranging measurements. Uncertainty on approaching wind direction is characterized via a Markov chain Monte Carlo procedure, and propagated through Monte Carlo sampling to wind speed and resolved Reynolds stresses. Given the substantial computational cost of LES, a surrogate model based on an exiguous number of LESs is used for flow simulations within the UQ framework. As a result of the analysis, the UQ solution is given by probability density functions of selected flow statistics at different heights. Profiles of mean ± standard deviation for the considered flow statistics exhibit excellent agreement with corresponding observations, proving that the proposed approach is able to calibrate the approaching wind angle parameter, and that the quantified uncertainty captures discrepancies between observations and model results. Overall, the present work highlights the potential of UQ to enhance predictions of exchange processes between vegetation canopy and atmosphere.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"130 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139587423","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

Influence of Street Trees on Turbulent Fluctuations and Transport Processes in an Urban Canyon: A Wind Tunnel Study 行道树对城市峡谷湍流波动和传输过程的影响：风洞研究

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-22 DOI: 10.1007/s10546-023-00843-9

Annika Vittoria Del Ponte, Sofia Fellini, Massimo Marro, Maarten van Reeuwijk, Luca Ridolfi, Pietro Salizzoni

{"title":"Influence of Street Trees on Turbulent Fluctuations and Transport Processes in an Urban Canyon: A Wind Tunnel Study","authors":"Annika Vittoria Del Ponte, Sofia Fellini, Massimo Marro, Maarten van Reeuwijk, Luca Ridolfi, Pietro Salizzoni","doi":"10.1007/s10546-023-00843-9","DOIUrl":"https://doi.org/10.1007/s10546-023-00843-9","url":null,"abstract":"The presence of vegetation within urban canyons leads to non-trivial patterns of the concentration of airborne pollutants, as a result of the complex structure of the velocity field. To investigate the relationship between concentration, velocity fields and vegetation density, we have performed wind-tunnel experiments in a reduced-scale street canyon, oriented perpendicular to the external wind flow, within which we placed a steady ground-level line source of a passive tracer. The aerodynamic behavior of vegetation was reproduced by inserting plastic miniatures of trees along the two long sides of the canyon, according to three different densities. The canyon ventilation was investigated by acquiring one-point simultaneous statistics of concentration and velocity over a dense grid of points within the canyon. The results show that the presence of trees hinders the upward mean vertical velocity at the rooftop, causes a reduction of the turbulent kinetic energy inside the canyon, and reduces the energy content of the large scales. The scalar concentration is conversely characterized by an enhanced level of turbulent fluctuations, whose magnitude is not dampened increasing the tree density. Within the canyon, high tree density inhibits turbulent mass fluxes, which are instead enhanced at roof level, where the mean component of the scalar flux is however hindered. A statistical analysis of concentration time series reveals that the lognormal distribution is suitable to model concentration fluctuations and extreme events, in dispersing plumes emitted by a linear source.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"26 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139558532","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

Turbulence in the Strongly Heterogeneous Near-Surface Boundary Layer over Patchy Snow 成片积雪上强异质近地表边界层中的湍流

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-22 DOI: 10.1007/s10546-023-00856-4

Michael Haugeneder, Michael Lehning, Ivana Stiperski, Dylan Reynolds, Rebecca Mott

{"title":"Turbulence in the Strongly Heterogeneous Near-Surface Boundary Layer over Patchy Snow","authors":"Michael Haugeneder, Michael Lehning, Ivana Stiperski, Dylan Reynolds, Rebecca Mott","doi":"10.1007/s10546-023-00856-4","DOIUrl":"https://doi.org/10.1007/s10546-023-00856-4","url":null,"abstract":"The near-surface boundary layer above patchy snow cover in mountainous terrain is characterized by a highly complex interplay of various flows on multiple scales. In this study, we present data from a comprehensive field campaign that cover a period of 21 days of the ablation season in an alpine valley, from continuous snow cover until complete melt out. We recorded near-surface eddy covariance data at different heights and investigated spectral decompositions. The topographic setting led to the categorisation of flows into up and down valley flows, with a down valley Föhn event in the middle of the observation period. Our findings reveal that the snow cover fraction is a major driver for the structure and dynamics of the atmospheric layer adjacent to the snow surface. With bare ground emerging, stable internal boundary layers (SIBL) developed over the snow. As the snow coverage decreased, the depth of the SIBL decreased below 1 m and spectra of air temperature variance showed a transition towards turbulent time scales, which were caused by the intermittent advection of shallow plumes of warm air over the snow surface. The intermittent advection could also be observed visually with high spatio-temporal resolution measurements using a thermal infrared camera. While the shallow advection only affected the lowest measurement level at 0.3 m, the measurements above at 1 m, 2 m, and 3 m indicate that the distribution of eddy size and, thus, the turbulence structure, did not distinctly change with height.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"26 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139558536","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

Effect of Urban Morphology and an Upstream Tall Building on the Scale Interaction Between the Overlying Boundary Layer and a Street Canyon 城市形态和上游高楼对上覆边界层与街道峡谷之间的尺度相互作用的影响

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-19 DOI: 10.1007/s10546-023-00844-8

引用次数: 0

A Study of Intermittent Turbulence in Stable Arctic Boundary Layers 稳定北极边界层中的间歇性湍流研究

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-12 DOI: 10.1007/s10546-023-00847-5

Brian J. Butterworth, Gijs Boer, Dale Lawrence

引用次数: 1

Impact of Uncertainties in the Atmospheric Boundary Layer Height on the Numerical Simulation of Chemical Species 大气边界层高度的不确定性对化学物质数值模拟的影响

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-12 DOI: 10.1007/s10546-023-00846-6

Shuzhan Ren, Craig A. Stroud

{"title":"Impact of Uncertainties in the Atmospheric Boundary Layer Height on the Numerical Simulation of Chemical Species","authors":"Shuzhan Ren, Craig A. Stroud","doi":"10.1007/s10546-023-00846-6","DOIUrl":"https://doi.org/10.1007/s10546-023-00846-6","url":null,"abstract":"Uncertainties in the atmospheric boundary layer height (ABL-H) are associated either with the uncertainties in meteorological fields or the definition of the ABL-H. When the ABL-H is involved in ABL parameterization schemes these uncertainties can have impacts on numerical simulation of chemical species. The impacts are examined numerically by employing a 1-D diffusion model with the K-profile scheme and 3-D air quality forecast model with the turbulent kinetic energy (TKE)-based scheme. The dependency on the ABL-H in the two schemes is very different. Sensitivity tests with the 1-D model show that the over-estimated/under-estimated ABL-H leads to the decrease/increase of concentration of tracers under both stable and unstable conditions due to the increase/decrease of the volume of tracers within the ABL. Under unstable conditions, the over-estimated/under-estimated ABL-H also enhances/weakens the vertical diffusivity, and leads to the decrease/increase of the concentration of tracers for the negative/positive vertical gradient of tracer. These impacts result in a little change with height within the ABL. The impacts of the ABL-H through the counter-gradient term and entrainment flux are much smaller than the impact through changing the volume of the ABL and vertical diffusivity in the ABL. Sensitivity tests with the 3-D numerical model with the TKE scheme show that over urban areas the over-estimated/under-estimated ABL-H leads to the increase/decrease of TKE in the whole ABL but does not always lead to stronger/weaker diffusivity and lower/higher concentrations of chemical species.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"87 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139460258","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

Effect of Small-Scale Topographical Variations and Fetch from Roughness Elements on the Stable Boundary Layer Turbulence Statistics 小尺度地形变化和粗糙度要素褶皱对稳定边界层湍流统计的影响

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-12 DOI: 10.1007/s10546-023-00855-5

S. Bhimireddy, Jielun Sun, Junming Wang, D. Kristovich, A. Hiscox

引用次数: 0