Abstract
Ice motion is an essential element for accurately evaluating glacier mass balance. Interferometric synthetic aperture radar (InSAR) has been widely applied for monitoring ice motion with high precision and wide coverage in the Antarctic. However, the ionospheric effects can significantly impact InSAR-based ice-motion measurements. At low radar frequencies in particular, the ionospheric effects have been regarded as a serious source of noise in L-band SAR data. The split-spectrum method (SSM) is commonly used for correcting the ionospheric effects of the InSAR technique. However, it requires spatial filtering with the relatively large factors used to scale the sub-bands’ interferograms, which often results in an unwrapped phase error. In this paper, a reformulation of the split-spectrum method (RSSM) is introduced to correct the ionospheric effects in the Grove Mountains of East Antarctica, which have slow ice flow and frequent ionosphere changes. The results show that RSSM can effectively correct the ionospheric effects of InSAR-based ice-motion measurements. To evaluate the ability of ionospheric correction using RSSM, the result of ionospheric correction derived from SSM is compared with the results of RSSM. In addition, ionosphere-corrected ice motion is also compared with GPS and MEaSUREs. The results show that the ionosphere-corrected ice velocities are in good agreement with GPS observations and MEaSUREs. The average ice velocity from the InSAR time series is compared to that from MEaSUREs, and the average ionosphere-corrected ice velocity error reduces 43.9% in SSM and 51.1% in RSSM, respectively. The ionosphere-corrected ice velocity error is the most significant, reducing 86.9% in SSM and 90.4% in RSSM from 1 November 2007 to 19 December 2007. The results show that the ability of RSSM to correct ionospheric effects is slightly better than that of SSM. Therefore, we deduce that the RSSM offers a feasible way to correct ionospheric effects in InSAR-based ice-motion measurements in Antarctica.
Highlights
This agreement demonstrates that the ionospheric correction for 14 of We ice motion can improve the accuracy of the Interferometric synthetic aperture radar (InSAR)-based ice-motion measurements
A large number of ALOS PALSAR data covering Antarctica are available for free downdownload, which greatly facilitates the use of InSAR ice-motion measurements in Antarcload, which greatly facilitates the use of InSAR ice-motion measurements in Antarctica, tica, but the ionospheric effects restrain its abilities and development, especially in regions but the ionospheric effects restrain its abilities and development, especially in regions with with slow ice motion
We present the reformulation of the split-spectrum method (RSSM) for the correction of ionospheric slow ice motion
Summary
The working Group I report of the Sixth Assessment Report (AR6) of the Intergovernmental Panel on Climate Change (IPCC) was released in August 2021. AR6 indicates that the components of the cryosphere have rapidly been shrinking under climate warming over recent years. The rapid shrinking of the cryosphere makes it the most significant potential contributor to rising global mean sea levels [1,2]. Ice motion is a fundamental observation required to predict the behavior of the cryosphere and global climate change in the future [3,4]. Large-scale ice-motion measurements in Antarctica are vital for determining the mass balance of ice sheets [5].
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