Spatiotemporal Variation of Sea Ice Freeboard in the Antarctic Weddell Sea Based on CryoSat-2 Altimeter Data

GAO Xiang; PANG Xiaoping; JI Qing

doi:10.13203/j.whugis20180504

Volume 46 Issue 1

Jan. 2021

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Geomatics and Information Science of Wuhan University > 2021 > 46(1): 125-132. > DOI: 10.13203/j.whugis20180504

GAO Xiang, PANG Xiaoping, JI Qing. Spatiotemporal Variation of Sea Ice Freeboard in the Antarctic Weddell Sea Based on CryoSat-2 Altimeter Data[J]. Geomatics and Information Science of Wuhan University, 2021, 46(1): 125-132. DOI: 10.13203/j.whugis20180504

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Spatiotemporal Variation of Sea Ice Freeboard in the Antarctic Weddell Sea Based on CryoSat-2 Altimeter Data

GAO Xiang^1,,
PANG Xiaoping^{1, 2},
JI Qing^{1, 2, ,}

1.
Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China
2.
Key Laboratory of Polar Surveying and Mapping Science, Ministry of Natural Resources, Wuhan 430079, China

Funds:

The National Natural Science Foundation of China 41606215

The National Natural Science Foundation of China 41576188

the National Key Research and Development Program of China 2017YFA0603104

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Author Bio:
GAO Xiang, PhD, specializes in sea ice remote sensing. E-mail: xgao@whu.edu.cn
Corresponding author:
JI Qing, PhD, associate professor. E-mail: jiqing@whu.edu.cn
Received Date: December 26, 2019
Published Date: January 04, 2021

Graphical Abstract

Abstract

Abstract

In order to improve the estimation accuracy of freeboard of Antarctic sea ice, this paper combined CryoSat-2 altimeter data, ASPeCt ship observational data and IceBridge airborne altimeter data to explore the optimal parameters for freeboard estimation using the minimum method, as well as analyzed spatiotemporal variation of sea ice freeboard from May to October, 2011-2017 in the Weddell sea. The result indicates that the optimal parameter scheme for retrieving freeboard is to apply the average of the lowest 5% measurements as local sea surface height after eliminating the gross data using 0.8 times standard deviation within 10 km segment. Over the past seven years, sea ice freeboard in the Weddell sea presents a slightly thinning trend, and monthly average freeboard ranges from 17.9 cm to 27.4 cm. The distribution of sea ice freeboard of the Weddell sea is characterized by the thick sea ice located in the west Weddell sea and near the Antarctic Peninsula, while thin sea ice distributed in the east Weddell sea. This study could be beneficial for further studying the response of the Antarctic sea ice thickness to climate change.
- CryoSat-2 altimeter data,
- the Weddell sea,
- sea ice freeboard,
- spatiotemporal variation

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References

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Spatiotemporal Variation of Sea Ice Freeboard in the Antarctic Weddell Sea Based on CryoSat-2 Altimeter Data

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