Evaluation of Different WRF Parametrizations over the Region of Iași with Remote Sensing Techniques

Roșu, Iulian-Alin; Ferrarese, S.; Radinschi, Irina; Ciocan, Vasilică; Cazacu, Marius Mihai

doi:10.3390/atmos10090559

Cited by 9 publications

(5 citation statements)

References 48 publications

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“…The technical specifications of the main components of the lidar platform used in our study are an Nd:YAG laser component producing laser pulses at a frequency of 30 Hz, with a wavelength of 532 nm, the laser beam diameter of 6 mm, and a pulse energy of 100 mJ and a Newtonian LightBridge telescope with a primary mirror diameter of 406 mm. The lidar platform utilized in the study has a spatial resolution of 3.75 m and both technical details and results from previous measurement campaigns were reported in the scientific literature in independent studies [23,24] and in our previous studies [13,14,22,24]. The profile is calculated by software written in Python 3.6 [22].…”

Section: Resultsmentioning

confidence: 99%

Towards Possible Laminar Channels through Turbulent Atmospheres in a Multifractal Paradigm

et al. 2021

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In this paper, developments are made towards simulating complex atmospheric behavior using turbulent energy cascade staging models developed through scale relativity theories. Such theoretical considerations imply gauges that describe atmospheric parameters as multifractal functions undertaking scale symmetry breaking at each stage of the turbulent energy cascade. It is found that gauges of higher complexity (in this case, a Riccati-type gauge) can exhibit more complex behavior accordingly, such as both dilation and contraction, but properly parameterizing the solutions formed by these gauges in terms of turbulent staging can be challenging given the multiple constants and parameters. However, it is found that a logistic-type approximation of the multifractal equations of motion that describe turbulent atmospheric entities can be coupled with a model produced by a simpler gauge, and this combination can reveal instances of laminar, or otherwise non-chaotic, behavior in a given turbulent flow at certain scales. Employing the theory with elastic lidar data, quasi-laminar behavior is found in the vicinity of the planetary boundary layer height, and laminar channels are revealed throughout an atmospheric column—these might be used to reveal complex vertical transport behavior in the atmospheric column.

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Section: Resultsmentioning

confidence: 99%

Towards Possible Laminar Channels through Turbulent Atmospheres in a Multifractal Paradigm

et al. 2021

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“…The technical specifications of the main components of the lidar platform utilized in the study are as follows: the laser component is a Nd:YAG, producing pulses of laser at a frequency of 30 Hz, with a wavelength of 532 nm, laser beam diameter of 6 mm, and a pulse energy of 100 mJ; meanwhile, the optical component is a Newtonian LightBridge telescope with a primary mirror diameter of 406 mm. The lidar platform utilized in the study has a spatial resolution of 3.75 m and both technical details and results from previous measurement campaigns were reported in the scientific literature in independent studies [16,17] and in our previous studies [5,15,18]. The profile is calculated by software written in Python 3.6 [15].…”

Section: Correspondences Of the Model With Experimental Datamentioning

confidence: 99%

Multifractal Model of Atmospheric Turbulence Applied to Elastic Lidar Data

2021

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This paper shall present a multifractal interpretation of turbulent atmospheric entities, considering them a complex system whose dynamics are manifested on continuous yet non-differentiable multifractal curves. By bringing forth theoretical considerations regarding multifractal structures through non-differentiable functions in the form of an adaptation of scale relativity theory, the minimal vortex of an instance of turbulent flow is considered. In this manner, the spontaneous breaking of scale invariance becomes a mechanism for atmospheric turbulence generation. This then leads to a general equation for the non-differentiable vortex itself, with its component velocity fields, and to a vortex turbulent energy dissipation—all of which are plotted and studied. Once the structure of the non-differentiable multifractal structure is mathematically described, an improved phenomenological turbulence model and relations between turbulent energy dissipation and the minimal vortex are employed together, exemplifying the codependency of such models. Using turbulent medium wave propagation theory, certain relations are then extrapolated which allow the obtaining of the inner and outer length scales of the turbulent flow using lidar data. Finally, these altitude profiles are compiled and assembled into timeseries to exemplify the theory and to compare the results with known literature. This model is a generalization of our recent results published under the title “On a Multifractal Approach of Turbulent Atmosphere Dynamics”.

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“…In summary, there have been relatively few studies on central heating. For the statistical correlation method, the cumulative effect of central heating has not been considered, and for the numerical model simulation, the lack of detailed land surface parameters limited the model's performance [27,28]. Since central heating usually lasts for several months, the air temperature changes significantly [29].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Central Heating on the Urban Thermal Environment Based on Multi-Temporal Remote Sensing Images

Chen

Zhan

et al. 2022

Remote Sensing

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Research on the impact of anthropogenic heat discharge in a thermal environment is significant in climate change research. Central heating is more common in the winter in Northeast China as an anthropogenic heat. This study investigates the impact of central heating on the thermal environment in Shenyang, Changchun, and Harbin based on multi-temporal land surface temperature retrieval from remote sensing. An equivalent heat island index method was proposed to overcome the problem of the method based on a single-phase image, which cannot evaluate all the central heating season changes. The method improves the comprehensiveness of a thermal environment evaluation by considering the long-term heat accumulation. The results indicated a significant increase in equivalent heat island areas at night with 22.1%, 17.3%, and 19.5% over Shenyang, Changchun, and Harbin. The increase was significantly positively correlated with the central heating supply (with an R-value of 0.89 for Shenyang, 0.93 for Changchun, and 0.86 for Harbin; p < 0.05). The impact of central heating has a more significant effect than the air temperature. The results provide a reference for future studies of urban thermal environment changes.

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Evaluation of Different WRF Parametrizations over the Region of Iași with Remote Sensing Techniques

Cited by 9 publications

References 48 publications

Towards Possible Laminar Channels through Turbulent Atmospheres in a Multifractal Paradigm

Towards Possible Laminar Channels through Turbulent Atmospheres in a Multifractal Paradigm

Multifractal Model of Atmospheric Turbulence Applied to Elastic Lidar Data

The Impact of Central Heating on the Urban Thermal Environment Based on Multi-Temporal Remote Sensing Images

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