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腸腳腛腁腚Scientific Note 膋膂腬膍腙腁腖腍腭腋腈膖腵腠腟腗腑腜腡腝膦膓膐膚腎 腦腯腍腇腉腐膚腹腱腏膈膉膄膝膜膕膇腍腊腆腌 腀腒腌腐腛 + 腁腑腊腋 + 腏腇 + 腃腔腉腂 , 腎腘 - 腄腑 , 腈腚腙腓 . 腍腔腖腕 / Characteristics of sea ice thickness and snow depth distributions of the land-fast ice during summer in Lu ¨tzow-Holmbukta, Antarctica, revealed from ship-based observations Shotaro Uto + , Haruhito Shimoda + , Koh Izumiyama + , Shuki Ushio , , Shigeru Aoki - , Gen Hashida , , Hiroyuki Wakabayashi . and Fumihiko Nishio / ,**. / +* 膗腾膛; ,**. 1 1 膗腾膣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 Lu ¨tzow-Holmbukta. Probability density functions of annual total thickness (ice thicknesssnow depth) derived from video observations are categorized into 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 of this location, while multi-year ice mostly develops onshore. Ice thickness and snow depth gradually decrease toward the coast within about ,* km o#shore, probably due to 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 Lu ¨tzow-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. + 腨膂腰膀腣膌腸腳膁National Maritime Research Institute, 0 -2 + Shinkawa, Mitaka-shi, Tokyo +2+ ***.. , 膃膞腓腔腘腝腸腳腮腺腼膤腵膏腸腳膁National Institute of Polar Research, Research Organization of Information and Systems, Kaga +-chome, Itabashi-ku, Tokyo +1- 2/+/. - 膟腨膔膎腪膒腥腧腪腸腳膁Institute of Low Temperature Science, Hokkaido University, Kita-+3, Nishi-2, Kita-ku, Sapporo *0* *2+3. . 腤膑腻腶腸腳腩膙腮腺膏腲腬膍膢膠膆膅腕腢腖腁Earth Observation Research and Application Center, Japan Aerospace Exploration Agency, + 2 +* Harumi, Chuo-ku, Tokyo +*. 0*,-. / 膊膡膎腪腫腴腠腞腁腚腕腢腓腢腒腸腳腕腢腖腁Center for Environmental Remote Sensing, Chiba University, + -- Yayoi, Inage, Chiba ,0- 2/,,. 膖腵腽膥 , Vol. .2, No. -, +0/ +13, ,**. Nankyoku Shiryo ˆ (Antarctic Record), Vol. .2, No. -, +0/ +13, ,**. ,**. National Institute of Polar Research 165

Transcript of ˘ˇˆ˙˝˛˚ ˜ !#˛$%&’()*+,- ./0ˇˆ ˙˝˛ ˚˜ !"# $%&’() *+,-. /0 12 345 6 ˚7 $8...

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�������Scientific Note

����� ������������������� !"#�$%&'()*+,- ./0

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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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