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Characteristics of sea ice thickness and snow depth distributions of the
land-fast ice during summer in Lutzow-Holmbukta, Antarctica,
revealed from ship-based observations
Shotaro Uto+, Haruhito Shimoda+, Koh Izumiyama+, Shuki Ushio,, Shigeru Aoki-,
Gen Hashida,, Hiroyuki Wakabayashi. and Fumihiko Nishio/
1,**.2 /3 +*456; ,**.2 13 14578
Abstract: Sea ice observations have been conducted onboard the Antarctic Re-
search Vessel “Shirase” since +321. The authors summarize these data to investigate
spatial and inter-annual variability of sea ice thickness and snow depth of the summer
land-fast ice in Lutzow-Holmbukta. Probability density functions of annual total
thickness (ice thickness9snow depth) derived from video observations are categorizedinto two types, i.e. a thin-ice and a thick-ice type. The total thickness distributions
observed by the electro-magnetic inductive method have a clear discontinuity, which
reflects the past break-up of the land-fast ice. Thin first-year ice develops o#shore ofthis location, while multi-year ice mostly develops onshore. Ice thickness and snow
depth gradually decrease toward the coast within about ,* km o#shore, probably dueto snow drift driven by the strong northeasterly wind. It is concluded that the past
breakup of the land-fast ice as well as snow depth have dominant influence on the
spatial distribution of ice thickness in Lutzow-Holmbukta. The extent of break-up
varies significantly year by year. The smaller extent enhances the development of
thick multi-year ice, while the larger extent, coupled with the influence of snow drift,
enhances reduction or extinction of thick multi-year ice.
+ :�;<=>��?@ National Maritime Research Institute, 0�-2�+ Shinkawa, Mitaka-shi, Tokyo +2+�***..
, AB�CDE���FGHI�J��?@ National Institute of Polar Research, Research Organizationof Information and Systems, Kaga +-chome, Itabashi-ku, Tokyo +1-�2/+/.
- K:LMNOPQN��?@ Institute of Low Temperature Science, Hokkaido University, Kita-+3,Nishi-2, Kita-ku, Sapporo *0*�*2+3.
. RSTU��VWFGJXYZ[\]^��@ Earth Observation Research and Application
Center, Japan Aerospace Exploration Agency, +�2�+* Harumi, Chuo-ku, Tokyo +*.�0*,-./ _`MNab�c��]^C^d��]^��@ Center for Environmental Remote Sensing, Chiba
University, +�-- Yayoi, Inage, Chiba ,0-�2/,,.
��ef , Vol. .2, No. -, +0/�+13, ,**.Nankyoku Shiryo (Antarctic Record), Vol. .2, No. -, +0/�+13, ,**.� ,**. National Institute of Polar Research
165
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yz{| �,**-": �A��34��Y��X�h����`�]+32*��,**-�����\�5], 34��G .1G --2�-.2.
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