2016
DOI: 10.1007/s10546-016-0168-3
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The Variability of Refractivity in the Atmospheric Boundary Layer of a Tropical Island Volcano Measured by Ground-Based Interferometric Radar

Abstract: For 24 h we measured continuously the variability of atmospheric refractivity over a volcano on the tropical island of Montserrat using a ground-based radar interferometer. We observed variations in phase that we interpret as due to changing water vapour on the propagation path between the radar and the volcano and we present them here in the context of the behaviour of the atmospheric boundary layer over the island. The water vapour behaviour was forced by diurnal processes, the passage of a synoptic-scale sy… Show more

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Cited by 7 publications
(6 citation statements)
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“…Troughs of dry upper tropospheric air also occur in the eastern Caribbean (e.g. Wadge et al, 2016). From our perspective the most significant impact that these events have is their disruption of the ABL, particularly the speed and direction of the wind over the island.…”
Section: The Study Site: Montserrat Lesser Antillesmentioning
confidence: 85%
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“…Troughs of dry upper tropospheric air also occur in the eastern Caribbean (e.g. Wadge et al, 2016). From our perspective the most significant impact that these events have is their disruption of the ABL, particularly the speed and direction of the wind over the island.…”
Section: The Study Site: Montserrat Lesser Antillesmentioning
confidence: 85%
“…Radiosondederived specific humidity profiles for the days of radar imaging are discussed in section 5.1. A strong diurnal cycle of water vapour variability was observed on 4-5 August, 2013 in the ground radar interferometer measurements of Wadge et al (2016) over Montserrat. The windward slopes of the mountains were heated first at sunrise and a rapidly mixing layer driven by convective heating developed over about 2 hours.…”
Section: The Study Site: Montserrat Lesser Antillesmentioning
confidence: 94%
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“…The GPRI signals exclusively penetrate air close to the ground, which can hold more moisture than air aloft. Therefore, although the GPRI signal penetrates less atmosphere than spaceborne SAR, ∆Φ atm can be substantial [33]. With that said, the moisture content will strongly depend on temperature, hence for sea ice, ∆Φ atm is expected to be most pronounced during spring/summer.…”
Section: Interferometric Conceptsmentioning
confidence: 99%
“…The correction of atmospheric phase contributions is particularly difficult over topography that varies on a short spatial scale, for example, in measuring the slip rate of major faults [e.g., Elliott et al , ; Doin et al , ]. Volcanic settings introduce additional challenges for both empirical and predictive atmospheric mitigation, as high topography can induce turbulence on the scale of kilometers, and volcanic plumes may also contain water vapor [e.g., Wadge et al , ].…”
Section: Introductionmentioning
confidence: 99%