Spaceborne thermal infrared observations of Arctic sea ice leads at 30 m resolution

IF 4.4 2区地球科学 Q1 GEOGRAPHY, PHYSICAL

Cryosphere Pub Date : 2023-07-14 DOI:10.5194/tc-17-2829-2023

Yujia Qiu, Xiaoming Li, Huadong Guo

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引用次数: 2

Abstract

Abstract. Sea ice leads play an important role in the heat exchange between the ocean and the overlying atmosphere, particularly narrow leads with widths of less than 100 m. We present a method for detecting sea ice leads in the Arctic using high-resolution infrared images from the Thermal Infrared Spectrometer (TIS) on board the Sustainable Development Science Satellite 1 (SDGSAT-1), with a resolution of 30 m in a swath of 300 km. With the spatial resolution of leads observed by infrared remote sensing increasing to tens of meters, focused on the Beaufort Sea cases in April 2022, the TIS-detected leads achieve good agreement with Sentinel-2 visible images. For the three infrared bands of the TIS, the B2 (10.3–11.3 µm) and B3 (11.5–12.5 µm) bands show similar performance in detecting leads. The B1 band (8.0–10.5 µm) can be usefully complementary to the other two bands, as a result of different temperature measurement sensitivity. Combining the detected results from the three TIS bands, the TIS is able to detect more leads with widths less than hundreds of meters compared to the Moderate Resolution Imaging Spectroradiometer (MODIS). Our results demonstrate that SDGSAT-1 TIS data at 30 m resolution can effectively observe previously unresolvable sea ice leads, providing new insight into the contribution of narrow leads to rapid sea ice changes in the Arctic.

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对北极海冰的星载热红外观测以30米分辨率领先

摘要海冰引线在海洋和上覆大气之间的热交换中起着重要作用，尤其是宽度小于100的狭窄引线 m.我们提出了一种利用可持续发展科学卫星1号（SDGSAT-1）上的热红外光谱仪（TIS）的高分辨率红外图像探测北极海冰铅的方法，分辨率为30 300米 2022年4月，随着红外遥感观测到的铅的空间分辨率提高到几十米，重点放在博福特海案例上，TIS探测到的铅与Sentinel-2可见图像达到了良好的一致性。对于TIS的三个红外波段，B2（10.3–11.3 µm）和B3（11.5–12.5 µm）波段在检测引线方面显示出类似的性能。B1频段（8.0–10.5 µm）可以有效地补充其他两个波段，这是不同温度测量灵敏度的结果。结合三个TIS波段的探测结果，与中分辨率成像光谱仪（MODIS）相比，TIS能够探测到更多宽度小于数百米的导线。我们的结果表明，SDGSAT-1 TIS数据在30 m分辨率可以有效地观测到以前无法解决的海冰引线，为窄引线对北极海冰快速变化的贡献提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cryosphere GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

8.70

自引率

17.30%

发文量

240

审稿时长

4-8 weeks

期刊介绍： The Cryosphere (TC) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of frozen water and ground on Earth and on other planetary bodies. The main subject areas are the following: ice sheets and glaciers; planetary ice bodies; permafrost and seasonally frozen ground; seasonal snow cover; sea ice; river and lake ice; remote sensing, numerical modelling, in situ and laboratory studies of the above and including studies of the interaction of the cryosphere with the rest of the climate system.