Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ground-based radar interferometry for monitoring of landfast sea ice dynamics
Abstract In this work, we evaluate landfast sea ice dynamics using ground-based radar interferometry. During two field campaigns in Utqiaġvik, Alaska, we collected three ∼24-h series of measurements on 16 May 2012 and 21–23 April 2021 using the Gamma portable radar interferometer (GPRI). These data enable examination of progressive strain of landfast ice on the sub-cm scale. The results indicate near spatially uniform divergence strains exceeding 10−6 in response to an increase in offshore winds from 0 to 7 m s−1. Exceptions to uniform divergence are grounded ridges with either negligible or reduced motion. We also track uniform vertical shifts in response to cm-scale sea level change correlated with NOAA model tidal predictions. We evaluate and take steps to remove contributions from moisture variability, thereby reducing potential errors from atmospheric effects to less than 5 mm. The results suggest that the GPRI can be a valuable tool for monitoring ice-covered coastal zones. The system has possible applications for monitoring tides and ocean surges and tracking small-scale deformation of otherwise stationary ice that can lead to fracture and destabilization.
Highlights We resolve wind-induced ice strain over kilometers with cm-scale accuracy. We track vertical displacement of sea ice in microtidal environment. We obtain minute-scale temporal resolution and sub-meter range resolution. Allows accurate location and timing of episodic events e.g., cracks and detachments. Atmospheric effects can be mitigated by removing phase change from static targets.
Ground-based radar interferometry for monitoring of landfast sea ice dynamics
Abstract In this work, we evaluate landfast sea ice dynamics using ground-based radar interferometry. During two field campaigns in Utqiaġvik, Alaska, we collected three ∼24-h series of measurements on 16 May 2012 and 21–23 April 2021 using the Gamma portable radar interferometer (GPRI). These data enable examination of progressive strain of landfast ice on the sub-cm scale. The results indicate near spatially uniform divergence strains exceeding 10−6 in response to an increase in offshore winds from 0 to 7 m s−1. Exceptions to uniform divergence are grounded ridges with either negligible or reduced motion. We also track uniform vertical shifts in response to cm-scale sea level change correlated with NOAA model tidal predictions. We evaluate and take steps to remove contributions from moisture variability, thereby reducing potential errors from atmospheric effects to less than 5 mm. The results suggest that the GPRI can be a valuable tool for monitoring ice-covered coastal zones. The system has possible applications for monitoring tides and ocean surges and tracking small-scale deformation of otherwise stationary ice that can lead to fracture and destabilization.
Highlights We resolve wind-induced ice strain over kilometers with cm-scale accuracy. We track vertical displacement of sea ice in microtidal environment. We obtain minute-scale temporal resolution and sub-meter range resolution. Allows accurate location and timing of episodic events e.g., cracks and detachments. Atmospheric effects can be mitigated by removing phase change from static targets.
Ground-based radar interferometry for monitoring of landfast sea ice dynamics
Dammann, Dyre Oliver (Autor:in) / Johnson, Mark A. (Autor:in) / Mahoney, Andrew R. (Autor:in) / Fedders, Emily R. (Autor:in) / Ito, Masato (Autor:in) / Hutchings, Jennifer K. (Autor:in) / Polashenski, Christopher M. (Autor:in) / Fahnstock, Mark (Autor:in)
13.01.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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