Meteorology, Climatology, and Upper Atmospheric Composition for Infrasound Propagation Modeling

Drob, D. P.

doi:10.1007/978-3-319-75140-5_14

Cited by 23 publications

(13 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the observed fluctuations in Figure 8 are not directly related to gravity waves. Usually, variations in such periods correspond to phenomena with length scales of hundreds of meters to tens of kilometers (Drob, 2019; Stull, 2017). Moreover, the sensitivity of the infrasonic waves to various small‐scale atmospheric structures depends on the frequency spectrum.…”

Section: Discussionmentioning

confidence: 99%

“…The simulations are based on realistic atmospheric profiles that contain vertical variability of density, temperature, and winds; these are based on NASA's MERRA2 product (Gelaro et al., 2017). For convenience the profiles are retrieved via the ground‐to‐space (G2S) (Drob, 2019; Drob et al., 2003) experimental prototype server of NCPA (http://130.74.32.249/). The atmospheric profiles were extracted every 5 km between McAAP (midpoint between areas 1 and 2) and EOC (distance of 54 km) for each day at 16:34, 17:34, and 18:34 UTC (10:34 a.m., 11:34 a.m., and 12:34 p.m. local time).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Evidence for Short Temporal Atmospheric Variations Observed by Infrasonic Signals: 1. The Troposphere

Averbuch

Ronac‐Giannone

Arrowsmith

et al. 2022

Earth and Space Science

View full text Add to dashboard Cite

Infrasound monitoring is used in the forensic analysis of events, studying the physical processes of sources of interest, and probing the atmosphere. The dynamical nature of the atmosphere and the use of infrasound as a forensic tool lead to the following questions; (1) what is the timescale of atmospheric variability that affects infrasonic signals? (2) how do infrasound signals vary as a function of time? This study addresses these questions by monitoring a repetitive infrasound source and its corresponding tropospheric returns 54 km away. Source‐receiver empirical Green's functions are obtained every 20 s and used to demonstrate the effect of atmospheric temporal variability on infrasound propagation. In addition, observations are compared to predicted simulated signals based on realistic atmospheric conditions. Based on 127 events over 3 days, it is shown that infrasound properties change within tens of seconds. Particularly, phases can appear and disappear, the propagation time varies, and the signals' energy fluctuates. Such variations are attributed to changes in temperatures and winds. Furthermore, atmospheric models can partly explain the observed changes. Therefore, this study highlights the potential of high temporal infrasound‐based atmospheric sounding.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Evidence for Short Temporal Atmospheric Variations Observed by Infrasonic Signals: 1. The Troposphere

Averbuch

Ronac‐Giannone

Arrowsmith

et al. 2022

Earth and Space Science

View full text Add to dashboard Cite

show abstract

“…The use of formal propagation models requires atmospheric specifications from the ground to the upper atmosphere. As upper atmospheric specifications are typically limited to climatologies, this has implications for the accuracy of thermospheric returns (Assink et al, 2012;Drob, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…These waveguides change with time and location. The effective sound speed approximates the combined effect of wind and temperature on infrasound propagation in a horizontally layered atmosphere (c eff ), which is defined as the sum of the adiabatic sound speed (c T ) and the wind in the direction of propagation (Drob, 2019). The effective speed of sound ratio (c eff,ratio ) is a practical measure to quantify favourable ground-to-ground ducting con-…”

Section: Long-range Propagationmentioning

confidence: 99%

A Bird’s‐Eye View on Ambient Infrasonic Soundscapes

Ouden

Smets

Assink

et al. 2021

Geophysical Research Letters

View full text Add to dashboard Cite

The Southern hemisphere is characterized by its sparsity of in situ atmospheric observations due to large ocean volumes and consequently limited landmass. Meteo-France maintains and operates meteorological measurement facilities at some of the French Sub Antarctic and Antarctic lands. The Southern Oceans weather forecasts benefits from those in situ facilities in combination with remote satellite data (ERA5 Reanalysis, 2017;Levy & Brown, 1991). This study discusses the measurement of atmospheric pressure perturbations and their variations. Those observations have shown to be valuable for studying both infrasound and gravity waves (Blanc et al., 2018;Hupe, 2019;Marlton et al., 2019). Such observations can be retrieved from microbarometer arrays that are part of the global International Monitoring System (IMS). The IMS is in place to verify the Comprehensive Nuclear-Test-Ban Treaty (CTBT; Marty, 2019), and globally monitors the infrasonic wavefield.Deep oceanic ambient noise is globally the most omnipresent seismic and infrasound source. The sea state describes the energy of the ocean surface and is the driving force for four different seismo-acoustic wave contributions (Figure 1a). (a) Evanescent microbaroms at the ocean-air interface are a direct product of traveling ocean surface waves, unregarded the water depth nor bathymetry, and decays vertically (Hetzer et al., 2010;Waxler & Gilbert, 2006). (b) The primary microseisms are related to a traveling ocean waves as well; however, these are only generated at the seafloor whenever the surface wave is in phase with the ocean bathymetry (Ardhuin et al., 2015). Non-linear interaction of counter traveling ocean surface waves results Abstract A method is introduced to reconstruct microbarom soundscapes in absolute values. The soundscapes are compared to remote infrasound recordings from infrasound array I23FR (Kerguelen Island) and in situ recordings by the INFRA-EAR, a biologger deployed near the Crozet Islands. The reconstruction method accounts for all-acoustic contributions, divided into evanescent microbaroms (detectable directly above the source) and propagating microbaroms (detectable over long ranges). It is computed by integrating acoustic intensities over the ocean surface, convolved with the transfer function quantifying the propagation losses and propagation time. The reconstructed soundscapes are found within 2.7 dB for 85% of the measurements in the microbarom band of 0.1-0.3 Hz. Infrasonic soundscapes are essential for understanding the ambient infrasonic noise field and are a basic need for applications, such as atmospheric remote sensing, natural hazard monitoring, and verification of the Comprehensive Nuclear-Test-Ban Treaty.Plain Language Summary Microbaroms are omnipresent sources of low-frequency, inaudible sound, that is, infrasound. They have a characteristic and continuous signature within the infrasound spectrum and are often classified as ambient noise. The microbarom signals can be divided into a direct signal, only detectable close by the sou...

show abstract

“…So, this study aims to investigate the effect of some meteorological variables and conditions on radio waves and microwaves communication systems depending on real recorded data measured by hand. Without the air in the atmosphere, electromagnetic wave can't transport over all earth and make this wide communication, thus the atmospheric meteorological weather condition is considered as the most important factor that cause weaken in electromagnetic waves propagation [6]. Experiments referred to that the weather condition and the air directions caused by high or low pressure systems and geographic nature is widely effects on radio wave quality [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Some Meteorological Variables and Conditions on Mobile Phone and 'TV' Satellite Signal

Nemah¹,

Ahmed²,

Khaleed³

et al. 2021

Al-Mustansiriyah J. Sci.

View full text Add to dashboard Cite

The study aimed to seek for the effect of meteorological parameters and conditions on wave transport for both radio wave band that used by mobile phone communication and microwave band that used in 'TV' satellites by showing which atmospheric variable and conditions have a positive or negative effect on signal strength. Data of study was recorded perfectly from one selected point by hand using the same devices for all recording to exclude the error caused by changing device types. The results showed that atmospheric conditions had a noticeable effect on microwave signal band that used by 'TV' satellite especially when there was a rainy case, and for atmospheric 'UV' index it had a direct positive effect on radio waveband used by mobile phone because there was an increase in signal strength corresponding with increasing of 'UV' index (from 1 to 5 of UV index range). For temperature, the result showed inverse proportion with radio waveband signal, but relative humidity didn't show up any relations with both study band's signals. Day time variation of signals was recorded for both wavebands, the result of radio waveband signal fluctuated in semi sine wave shape but with decreasing trend along day time, and for 'TV' satellite microwave band signal the result recorded increasing trend along day time, and this may because of solar radiation activity but in general, the satellite band signal was higher affected by weather condition as compared with mobile phone radio wave signal band.

show abstract

Meteorology, Climatology, and Upper Atmospheric Composition for Infrasound Propagation Modeling

Cited by 23 publications

References 93 publications

Evidence for Short Temporal Atmospheric Variations Observed by Infrasonic Signals: 1. The Troposphere

Evidence for Short Temporal Atmospheric Variations Observed by Infrasonic Signals: 1. The Troposphere

A Bird’s‐Eye View on Ambient Infrasonic Soundscapes

Effect of Some Meteorological Variables and Conditions on Mobile Phone and 'TV' Satellite Signal

Contact Info

Product

Resources

About