Linking scales of sea ice surface topography: evaluation of ICESat-2 measurements with coincident helicopter laser scanning during MOSAiC
-
Published:2023-03-31
Issue:3
Volume:17
Page:1411-1429
-
ISSN:1994-0424
-
Container-title:The Cryosphere
-
language:en
-
Short-container-title:The Cryosphere
Author:
Ricker RobertORCID, Fons Steven, Jutila ArttuORCID, Hutter NilsORCID, Duncan Kyle, Farrell Sinead L., Kurtz Nathan T., Fredensborg Hansen Renée MieORCID
Abstract
Abstract. Information about sea ice surface topography and related deformation is crucial for studies of sea ice mass balance, sea ice modeling, and ship navigation through the ice pack. The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2), part of the National Aeronautics and Space Administration (NASA) Earth Observing System, has been on orbit for over 4 years, sensing the sea ice surface topography with six laser beams capable of capturing individual features such as pressure ridges. To assess the capabilities and uncertainties of ICESat-2 products, coincident high-resolution measurements of sea ice surface topography are required. During the yearlong Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition in the Arctic Ocean, we successfully carried out a coincident underflight of ICESat-2 with a helicopter-based airborne laser scanner (ALS), achieving an overlap of more than 100 km. Despite the comparably short data set, the high-resolution centimeter-scale measurements of the ALS can be used to evaluate the performance of ICESat-2 products. Our goal is to investigate how the sea ice surface roughness and topography are represented in different ICESat-2 products as well as how sensitive ICESat-2 products are to leads and small cracks in the ice cover. Here, we compare the ALS measurements with ICESat-2's primary sea ice height product, ATL07, and the high-fidelity surface elevation product developed by the University of Maryland (UMD).
By applying a ridge-detection algorithm, we find that 16 % (4 %) of the number of obstacles in the ALS data set are found using the strong (weak) center beam in ATL07. Significantly higher detection rates of 42 % (30 %) are achieved when using the UMD product. While only one lead is indicated in ATL07 for the underflight, the ALS reveals many small, narrow, and only partly open cracks that appear to be overlooked by ATL07.
Funder
Framsenteret Norges Forskningsråd National Aeronautics and Space Administration Bundesministerium für Forschung und Technologie
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference42 articles.
1. Andersen, O. B.: DTU21 Mean Sea Surface, DTU Data [data set], https://doi.org/10.11583/DTU.19383221.v1,
2022. a 2. Andersen, O. B., Rose, S. K., Knudsen, P., and Stenseng, L.: The DTU18 MSS Mean
Sea Surface improvement from SAR altimetry,
https://ftp.space.dtu.dk/pub/DTU18/MSS_MATERIAL/PRESENTATIONS/DTU18MSS-V2.pdf (last access: 24 March 2023),
2018. a 3. Castellani, G., Lüpkes, C., Hendricks, S., and Gerdes, R.: Variability of
Arctic sea-ice topography and its impact on the atmospheric surface drag,
J. Geophys. Res.-Oceans, 119, 6743–6762,
https://doi.org/10.1002/2013JC009712, 2014. a, b 4. Di Bella, A., Skourup, H., Bouffard, J., and Parrinello, T.: Uncertainty
reduction of Arctic sea ice freeboard from CryoSat-2 interferometric mode,
Adv. Space Res., 62, 1251–1264, https://doi.org/10.1016/j.asr.2018.03.018,
2018. a 5. Duncan, K. and Farrell, S. L.: Determining Variability in Arctic Sea Ice
Pressure Ridge Topography with ICESat-2, Geophys. Res. Lett., 49,
e2022GL100272, https://doi.org/10.1029/2022GL100272, 2022. a, b, c, d, e, f, g
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|