Boundary-Layer Meteorology最新文献_第4页

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

A Model for Low-Frequency, Anisotropic Wind Fluctuations and Coherences in the Marine Atmosphere 海洋大气低频各向异性风波动和相干模型

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-11 DOI: 10.1007/s10546-023-00850-w

Abdul Haseeb Syed, Jakob Mann

{"title":"A Model for Low-Frequency, Anisotropic Wind Fluctuations and Coherences in the Marine Atmosphere","authors":"Abdul Haseeb Syed, Jakob Mann","doi":"10.1007/s10546-023-00850-w","DOIUrl":"https://doi.org/10.1007/s10546-023-00850-w","url":null,"abstract":"To assess dynamic loads, large offshore wind turbines need detailed and reliable statistical information on the inflow turbulence. We present a model that includes low frequencies down to (sim 1) hr(^{-1}) using the observed (S(f) propto f^{-5/3}) in that range. The presented model contains a parameter representing the anisotropy of the two-dimensional, incompressible turbulence, and it assumes the low-frequency fluctuations to be homogeneous in the vertical direction. Combined with a three-dimensional model for the smaller scales, the model can predict correlations between different points. We have validated the model against two offshore wind data sets: a nacelle-mounted, forward-looking Doppler lidar with four beams at the Hywind Scotland offshore wind farm and sonic anemometer measurements at the FINO1 research platform in the North Sea. One-point auto spectra and two-point cross spectra were calculated after splitting the data into different atmospheric stability classes. The relative strength of the 2D low-frequency fluctuations to the 3D fluctuations was higher under stable conditions. The combined 2D+3D model was able to fit the measured spectra with good accuracy and could then predict the two-point cross spectra, co-coherences, and phase angles between wind fluctuations at different lateral and vertical separations. Good agreement was found between the measured and predicted values, albeit with exceptions. The model can generate stochastic wind fields for investigating wake meandering in wind farms or dynamic loads on floating wind turbines.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"30 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139421832","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

Transfer Efficiency and Organization in Turbulent Transport over Alpine Tundra. 阿尔卑斯苔原上湍流传输的传输效率和组织。

IF 2.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-01 Epub Date: 2024-08-28 DOI: 10.1007/s10546-024-00879-5

Laura Mack, Terje Koren Berntsen, Nikki Vercauteren, Norbert Pirk

{"title":"Transfer Efficiency and Organization in Turbulent Transport over Alpine Tundra.","authors":"Laura Mack, Terje Koren Berntsen, Nikki Vercauteren, Norbert Pirk","doi":"10.1007/s10546-024-00879-5","DOIUrl":"10.1007/s10546-024-00879-5","url":null,"abstract":"The exchange of momentum, heat and trace gases between atmosphere and surface is mainly controlled by turbulent fluxes. Turbulent mixing is usually parametrized using Monin-Obukhov similarity theory (MOST), which was derived for steady turbulence over homogeneous and flat surfaces, but is nevertheless routinely applied to unsteady turbulence over non-homogeneous surfaces. We study four years of eddy-covariance measurements at a highly heterogeneous alpine valley site in Finse, Norway, to gain insights into the validity of MOST, the turbulent transport mechanisms and the contributing coherent structures. The site exhibits a bimodal topography-following flux footprint, with the two dominant wind sectors characterized by organized and strongly negative momentum flux, but different anisotropy and contributions of submeso-scale motions, leading to a failure of eddy-diffusivity closures and different transfer efficiencies for different scalars. The quadrant analysis of the momentum flux reveals that under stable conditions sweeps transport more momentum than the more frequently occurring ejections, while the opposite is observed under unstable stratification. From quadrant analysis, we derive the ratio of the amount of disorganized to organized structures, that we refer to as organization ratio (OR). We find an invertible relation between transfer efficiency and corresponding organization ratio with an algebraic sigmoid function. The organization ratio further explains the scatter around scaling functions used in MOST and thus indicates that coherent structures modify MOST. Our results highlight the critical role of coherent structures in turbulent transport in heterogeneous tundra environments and may help to find new parametrizations for numerical weather prediction or climate models.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"190 9","pages":"38"},"PeriodicalIF":2.3,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11358334/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142104270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using the Sensible Heat Flux Eddy Covariance-Based Exchange Coefficient to Calculate Latent Heat Flux from Moisture Mean Gradients Over Snow. 利用基于涡协方差的显热通量交换系数计算雪上湿度平均梯度的潜热通量。

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2024-01-01 Epub Date: 2024-05-04 DOI: 10.1007/s10546-024-00864-y

Sergi González-Herrero, Armin Sigmund, Michael Haugeneder, Océane Hames, Hendrik Huwald, Joel Fiddes, Michael Lehning

{"title":"Using the Sensible Heat Flux Eddy Covariance-Based Exchange Coefficient to Calculate Latent Heat Flux from Moisture Mean Gradients Over Snow.","authors":"Sergi González-Herrero, Armin Sigmund, Michael Haugeneder, Océane Hames, Hendrik Huwald, Joel Fiddes, Michael Lehning","doi":"10.1007/s10546-024-00864-y","DOIUrl":"https://doi.org/10.1007/s10546-024-00864-y","url":null,"abstract":"In absence of the high-frequency measurements of wind components, sonic temperature and water vapour required by the eddy covariance (EC) method, Monin-Obukhov similarity theory (MOST) is often used to calculate heat fluxes. However, MOST requires assumptions of stability corrections and roughness lengths. In most environments and weather situations, roughness length and stability corrections have high uncertainty. Here, we revisit the modified Bowen-ratio method, which we call C-method, to calculate the latent heat flux over snow. In the absence of high-frequency water vapour measurements, we use sonic anemometer data, which have become much more standard. This method uses the exchange coefficient for sensible heat flux to estimate latent-heat flux. Theory predicts the two exchange coefficients to be equal and the method avoids assuming roughness lengths and stability corrections. We apply this method to two datasets from high mountain (Alps) and polar (Antarctica) environments and compare it with MOST and the three-layer model (3LM). We show that roughness length has a great impact on heat fluxes calculated using MOST and that different calculation methods over snow lead to very different results. Instead, the 3LM leads to good results, in part due to the fact that it avoids roughness length assumptions to calculate heat fluxes. The C-method presented performs overall better or comparable to established MOST with different stability corrections and provides results comparable to the direct EC method. An application of this method is provided for a new station installed in the Pamir mountains.Supplementary information: The online version contains supplementary material available at 10.1007/s10546-024-00864-y.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"190 5","pages":"24"},"PeriodicalIF":4.3,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11068579/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140853132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Arctic Fjord Breeze: Characteristics of a Combined Sea Breeze and Valley Wind in a Svalbard Fjord Valley 北极峡湾风：斯瓦尔巴特峡湾山谷中海风和山谷风结合的特点

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2023-12-08 DOI: 10.1007/s10546-023-00840-y

Matthias Henkies, Knut Vilhelm Høyland, Aleksey Shestov, Christiane Duscha, Anna Sjöblom

{"title":"The Arctic Fjord Breeze: Characteristics of a Combined Sea Breeze and Valley Wind in a Svalbard Fjord Valley","authors":"Matthias Henkies, Knut Vilhelm Høyland, Aleksey Shestov, Christiane Duscha, Anna Sjöblom","doi":"10.1007/s10546-023-00840-y","DOIUrl":"https://doi.org/10.1007/s10546-023-00840-y","url":null,"abstract":"Thermally-driven circulations are a frequent meteorological phenomenon in complex Arctic terrain, but the Arctic fjord breeze, a combined sea-breeze and up-valley wind, has received little attention. A field campaign was conducted in the valley Adventdalen in Svalbard in summer 2022 using a Scanning Doppler Lidar and automatic weather stations. It is shown that a local up-valley circulation occurred frequently in this valley, and that it was driven by the temperature and pressure gradient between valley and fjord, i.e., a fjord breeze. The fjord breeze existed in both large-scale up-valley and down-valley winds. Its strength, extent and depth varied due to the diurnal cycle of solar irradiation as well as the interaction with large-scale winds. In contrast to typical lower-latitude breezes, the Arctic fjord breeze could persist over several days. The breeze was found to be relatively strong even under small horizontal temperature contrasts and opposing large-scale winds, possibly due to an increase in the thermal pressure gradient by the surrounding topography.\u0000","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"5 1","pages":""},"PeriodicalIF":4.3,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138556880","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

The Surface Energy Budget of a Wheat Crop: Estimates of Storage 小麦作物的表面能量收支:储量估算

IF 4.3 3区地球科学

Boundary-Layer Meteorology Pub Date : 2023-11-21 DOI: 10.1007/s10546-023-00834-w

J. R. Garratt

引用次数: 0

The Performance of GRAMM-SCI and WRF in Simulating the Surface-Energy Budget and Thermally Driven Winds in an Alpine Valley gram - sci和WRF模拟高山山谷地表能量收支和热驱动风的性能

3区地球科学

Boundary-Layer Meteorology Pub Date : 2023-11-10 DOI: 10.1007/s10546-023-00835-9

Gaspard Simonet, Dietmar Oettl, Manuela Lehner

{"title":"The Performance of GRAMM-SCI and WRF in Simulating the Surface-Energy Budget and Thermally Driven Winds in an Alpine Valley","authors":"Gaspard Simonet, Dietmar Oettl, Manuela Lehner","doi":"10.1007/s10546-023-00835-9","DOIUrl":"https://doi.org/10.1007/s10546-023-00835-9","url":null,"abstract":"Abstract Using WRF as a benchmark, GRAMM-SCI simulations are performed for a case study of thermally driven valley- and slope winds in the Inn Valley, Austria. A clear-sky, synoptically undisturbed day was selected when large spatial heterogeneities occur in the components of the surface-energy budget driven by local terrain and land-use characteristics. The models are evaluated mainly against observations from four eddy-covariance stations in the valley. While both models are able to capture the main characteristics of the surface-energy budget and the locally driven wind field, a few overall deficiencies are identified: (i) Since the surface-energy budget is closed in the models, whereas large residuals are observed, the models generally tend to overestimate the daytime sensible and latent heat fluxes. (ii) The partitioning of the available energy into sensible and latent heat fluxes remains relatively constant in the simulations, whereas the observed Bowen ratio decreases continuously throughout the day because of a temporal shift between the maxima in sensible and latent heat fluxes, which is not captured by the models. (iii) The comparison between model results and observations is hampered by differences between the real land use and the vegetation type in the model. Recent modifications of the land-surface scheme in GRAMM-SCI improve the representation of nighttime katabatic winds over forested areas, reducing the modeled wind speeds to more realistic values.","PeriodicalId":9153,"journal":{"name":"Boundary-Layer Meteorology","volume":"17 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092366","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

Investigation of a Geometric Parameter Corresponding to the Turbulent Length Scale Within an Urban Canopy Layer 城市冠层湍流长度尺度的几何参数研究

3区地球科学

Boundary-Layer Meteorology Pub Date : 2023-10-30 DOI: 10.1007/s10546-023-00832-y

Takuto Sato, Hiroyuki Kusaka

引用次数: 0