Search Results - "Ackley, Stephen F"

Monitoring lake level changes on the Tibetan Plateau using ICESat altimetry data (2003–2009) by Zhang, Guoqing, Xie, Hongjie, Kang, Shichang, Yi, Donghui, Ackley, Stephen F.

“…In this study, ICESat altimetry data are used to provide precise lake elevations of the Tibetan Plateau (TP) during the period of 2003–2009. Among the 261…”
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Thickness distribution of Antarctic sea ice by Worby, Anthony P., Geiger, Cathleen A., Paget, Matthew J., Van Woert, Michael L., Ackley, Stephen F., DeLiberty, Tracy L.

“…Ship‐based observations are used to describe regional and seasonal changes in the thickness distribution and characteristics of sea ice and snow cover…”
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Sea-ice freeboard and thickness in the Ross Sea from airborne (IceBridge 2013) and satellite (ICESat 2003–2008) observations by Tian, Liuxi, Xie, Hongjie, Ackley, Stephen F., Tang, Jiakui, Mestas-Nuñez, Alberto M., Wang, Xianwei

“…NASA's Operation IceBridge mission flew over the Ross Sea, Antarctica (20 and 27 November 2013) and collected data with Airborne Topographic Mapper (ATM) and…”
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Snow-ice contribution to the structure of sea ice in the Amundsen Sea, Antarctica by Tian, Lijun, Gao, Yongli, Weissling, Blake, Ackley, Stephen F.

“…The widespread occurrence of snow-ice formation on the pack ice plays a critical role in the mass balance of Antarctic sea ice. The stable isotope composition,…”
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Seasonal and Interannual Variations in Sea Ice Thickness in the Weddell Sea, Antarctica (2019–2022) Using ICESat-2 by Joshi, Mansi, Mestas-Nuñez, Alberto M., Ackley, Stephen F., Arndt, Stefanie, Macdonald, Grant J., Haas, Christian

“…The sea ice extent in the Weddell Sea exhibited a positive trend from the start of satellite observations in 1978 until 2016 but has shown a decreasing trend…”
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Ice Production in Ross Ice Shelf Polynyas during 2017–2018 from Sentinel–1 SAR Images by Dai, Liyun, Xie, Hongjie, Ackley, Stephen F., Mestas-Nuñez, Alberto M.

“…High sea ice production (SIP) generates high-salinity water, thus, influencing the global thermohaline circulation. Estimation from passive microwave data and…”
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Calibrating a Viscoelastic Sea Ice Model for Wave Propagation in the Arctic Fall Marginal Ice Zone by Cheng, Sukun, Rogers, W. Erick, Thomson, Jim, Smith, Madison, Doble, Martin J., Wadhams, Peter, Kohout, Alison L., Lund, Björn, Persson, Ola P.G., Collins, Clarence O., Ackley, Stephen F., Montiel, Fabien, Shen, Hayley H.

“…This paper presents a wave‐in‐ice model calibration study. Data used were collected in the thin ice of the advancing autumn marginal ice zone of the western…”
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Weekly Mapping of Sea Ice Freeboard in the Ross Sea from ICESat-2 by Koo, YoungHyun, Xie, Hongjie, Kurtz, Nathan T, Ackley, Stephen F

“…NASA’s ICESat-2 has been providing sea ice freeboard measurements across the polar regions since October 2018. In spite of the outstanding spatial resolution…”
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Sea Ice Freeboard in the Ross Sea from Airborne Altimetry IcePod 2016–2017 and a Comparison with IceBridge 2013 and ICESat 2003–2008 by Tian, Liuxi, Xie, Hongjie, Ackley, Stephen F., Tinto, Kirsty J., Bell, Robin E., Zappa, Christopher J., Gao, Yongli, Mestas-Nuñez, Alberto M.

“…As part of the Polynyas and Ice Production in the Ross Sea (PIPERS) project, the IcePod system onboard the LC-130 aircraft based at McMurdo Station was flown…”
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Sea ice thickness estimations from ICESat Altimetry over the Bellingshausen and Amundsen Seas, 2003-2009 by Xie, Hongjie, Tekeli, Ahmet Emre, Ackley, Stephen F., Yi, Donghui, Zwally, H. Jay

“…Sea ice thicknesses derived from NASA's Ice, Cloud, and Land Elevation Satellite (ICESat) altimetry data are examined using two different approaches, buoyancy…”
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Thermodynamic and Dynamic Variations in Sea Ice Thickness of the Ross Sea, Antarctica, Driven by Atmospheric Circulation by Koo, Younghyun, Xie, Hongjie, Ackley, Stephen F.

“…Atmospheric circulation has significant impacts on sea ice drifting patterns and mass balance, as wind drag induces pressure ridges and leads on the sea ice…”
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Estimation of thermodynamic and dynamic contributions to sea ice growth in the Central Arctic using ICESat-2 and MOSAiC SIMBA buoy data by Koo, YoungHyun, Lei, Ruibo, Cheng, Yubing, Cheng, Bin, Xie, Hongjie, Hoppmann, Mario, Kurtz, Nathan T., Ackley, Stephen F., Mestas-Nuñez, Alberto M.

“…The fine spatial resolution of the ICESat-2 (IS2) satellite altimeter allows monitoring the evolution of sea ice thickness with detailed dynamic information…”
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Wave rafting and the equilibrium pancake ice cover thickness by Dai, Mingrui, Shen, Hayley H., Hopkins, Mark A., Ackley, Stephen F.

“…Pancake ice, the circular floes formed during ice growth in a wave field, forms in many polar and subpolar seas. Vertical thin sections of cores taken from the…”
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Limiting diameter of pancake ice by Shen, Hayley H., Ackley, Stephen F., Yuan, Yong

“…Two mechanisms have been hypothesized to limit the diameter of pancake ice, one due to bending failure and the other due to tensile failure. We conducted two…”
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Object-based detection of Arctic sea ice and melt ponds using high spatial resolution aerial photographs by Miao, Xin, Xie, Hongjie, Ackley, Stephen F., Perovich, Donald K., Ke, Changqing

“…High resolution aerial photographs used to detect and classify sea ice features can provide accurate physical parameters to refine, validate, and improve…”
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Evolution of the dynamics, area, and ice production of the Amundsen Sea Polynya, Antarctica, 2016–2021 by Macdonald, Grant J, Ackley, Stephen F, Mestas-Nuñez, Alberto M, Blanco-Cabanillas, AdriÃ

“…Polynyas are key sites of ice production during the winter and are important sites of biological activity and carbon sequestration during the summer. The…”
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Semi-automated tracking of iceberg B43 using Sentinel-1 SAR images via Google Earth Engine by Koo, YoungHyun, Xie, Hongjie, Ackley, Stephen F, Mestas-Nuñez, Alberto M, Macdonald, Grant J, Hyun, Chang-Uk

“…Sentinel-1 C-band synthetic aperture radar (SAR) images can be used to observe the drift of icebergs over the Southern Ocean with around 1–3 d of temporal…”
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Assessing Scale Dependence on Local Sea Level Retrievals from Laser Altimetry Data over Sea Ice by Tian, Liuxi, Xie, Hongjie, Ackley, Stephen F., Mestas-Nuñez, Alberto M.

“…The measurement of sea ice elevation above sea level or the “freeboard” depends upon an accurate retrieval of the local sea level. The local sea level has been…”
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Object-Based Arctic Sea Ice Ridge Detection From High-Spatial-Resolution Imagery by Xin Miao, Hongjie Xie, Ackley, Stephen F., Songfeng Zheng

“…High-spatial-resolution aerial photographs can provide detailed distribution of sea ice features. However, very few studies have ever considered shadows on the…”
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A method to automatically determine sea level for referencing snow freeboards and computing sea ice thicknesses from NASA IceBridge airborne LIDAR by Wang, Xianwei, Xie, Hongjie, Ke, Yanan, Ackley, Stephen F., Liu, Lin

“…The NASA IceBridge flights have obtained critical observations for Earth's polar ice since ICESat stopped collecting data in 2009. This study develops an…”
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