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第347回 大気海洋物理学・気候力学セミナー のおしらせ

日　時：5月13日 (木) 10:30 - 12:00
Date ：Thu., 13 May 10:30 - 12:00
ツール：Zoom (Online)
Tool ：Zoom (Online)

注意事項 ：Zoomのミーティング情報が必要な場合は下記のメールアドレスまでお問い合わせください。
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発表者：周 宏瑋（大気海洋物理学・気候力学コース/D3）
Speaker：CHOU Hung-Wei (Faculty of Environmental Earth Science/D3)
題目：南極斜面流および周極深層水の大陸棚侵入に対する潮汐の効果の議論
Title :Discussion of possible tidal impacts on heat intrusion towards the Totten Ice Shelf by numerical simulation

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南極斜面流および周極深層水の大陸棚侵入に対する潮汐の効果の議論
Discussion of possible tidal impacts on heat intrusion towards the Totten Ice Shelf by numerical simulation
周 宏瑋 (CHOU Hung-Wei)
発表要旨：

The Totten Ice Shelf (TIS) suffers rapid basal melting in the East
Antarctic coast caused by warm modified Circumpolar Deep Water (mCDW)
intrusion through the continental slope. Previous studies indicate that
the Antarctic Slope Current (ASC), which is partially associated with
the Antarctic Slope Front (ASF) with strong potential vorticity (PV)
gradient, blocks the mCDW intrusion efficiently. However, because of
lacking sufficient observations, the mesoscale variability across the
shelf break, especially the tidal currents, is waiting to be revealed
for further mCDW intrusion rate evaluation. In this study, we
preliminary identify the tidal influences on the mCDW intrusion across
the TIS shelf break in high-resolution regional ocean models by MITgcm.
By comparing 20 years wind-driven only model (non-tidal case) and the
tidal boundary condition added model (tidal case) outputs, the TIS is
warmer in the tidal case associated with warmer but PV lowered ASC in
isopycnal layers 1027.70~1027.78 kg/m3. The 1.5 hours snapshots exhibit
tidally-generated topographic trapped waves propagating along with the
shelf break. We hypothesize that the tidally-generated trapped waves on
the shelf break diffuses the water through two sides of the slope by
mesoscale variabilities and further meditate the shelf break's PV
barrier to the mCDW intrusion. In the end, we would like to discuss the
model validation and numerical chaos issues of this study.
    

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