Estimation of sea-ice thickness and volume in the Sea of Okhotsk based on ICESat data

Nihashi, Sohey; Kurtz, Nathan T.; Markus, Thorsten; Ohshima, Kay I.; Tateyama, Kazutaka; Toyota, Takenobu

doi:10.1017/aog.2018.8


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Estimation of sea-ice thickness and volume in the Sea of Okhotsk based on ICESat data

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/71623

Title:	Estimation of sea-ice thickness and volume in the Sea of Okhotsk based on ICESat data
Authors:	Nihashi, Sohey Browse this author
	Kurtz, Nathan T. Browse this author
	Markus, Thorsten Browse this author
	Ohshima, Kay I. Browse this author →KAKEN DB
	Tateyama, Kazutaka Browse this author
	Toyota, Takenobu Browse this author →KAKEN DB
Keywords:	remote sensing
	sea ice
	sea-ice geophysics
Issue Date:	Jul-2018
Publisher:	Cambridge University Press
Journal Title:	Annals of glaciology
Volume:	59
Issue:	76
Start Page:	101
End Page:	111
Publisher DOI:	10.1017/aog.2018.8
Abstract:	Sea-ice thickness in the Sea ofOkhotsk is estimated for 2004-2008 from ICESat derived free-board under the assumption of hydrostatic balance. Total ice thickness including snow depth (htot) averaged over 2004-2008 is 95 cm. The interannual variability of htot is large; from 77.5 cm (2008) to 110.4 cm (2005). The mode of htot varies from 50-60 cm (2007 and 2008) to 70-80 cm (2005). Ice thickness derived from ICESat data is validated from a comparison with that observed by Electromagnetic Induction Instrument (EM) aboard the icebreaker Soya near Hokkaido, Japan. Annual maps of htot reveal that the spatial distribution of h(tot) is similar every year. Ice volume of 6.3 x 10(11) m(3) is estimated from the ICESat derived h(tot) and AMSR-E derived ice concentration. A comparison with ice area demonstrates that the ice volume cannot always be represented by the area solely, despite the fact that the area has been used as a proxy of the volume in the Sea of Okhotsk. The ice volume roughly corresponds to that of annual ice production in the major coastal polynyas estimated based on heat budget calculations. This also supports the validity of the estimation of sea-ice thickness and volume using ICESat data.
Rights:	http://creativecommons.org/licenses/by/4.0/
Type:	article
URI:	http://hdl.handle.net/2115/71623
Appears in Collections:	低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 豊田威信

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