Variability of topographic Rossby waves observed on the shelfbreak of the Chukchi Sea
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Title
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Variability of topographic Rossby waves observed on the shelfbreak of the Chukchi Sea
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Other Titles
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척치해 대륙붕단에서 관측된 지형적 로스비파의 변동성
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Authors
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Ku, Ahyoung
Park, Jae-Hun
Seung, Young Ho
Jeon, Chanhyung
Choi, Youngseok
Shimada, Koji
Cho, Kyoung-Ho
Yoshizawa, Eri
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Keywords
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Topographic Rossby Waves; slope current; western Arctic Ocean
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Issue Date
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2020
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Citation
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Ku, Ahyoung, et al. 2020. Variability of topographic Rossby waves observed on the shelfbreak of the Chukchi Sea. Ocean Sciences Meeting 2020. San Diego Convention Center. 2020.02.16~2020.02.21.
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Abstract
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One-year-long current measurements from August 2014 at 193 m in the Chukchi Sea shelfbreak (74.80oN, 167.89oW) showed subinertial topographic Rossby waves (TRWs) around 35-hour period. The mooring was equipped with an upward-looking acoustic Doppler current profiler (ADCP, RDI WHS 600 kHz) at 58 m and a downward-looking ADCP (RDI WHS 300 kHz) at 63 m, 29 temperature sensors, and four salinity sensors. The observations reveal a feature of TRWs such as bottom-intensified up-slope current fluctuations significantly coherent with near-bottom temperature fluctuations with a phase lag of approximately 90o at 35 h. Theoretical estimates of wavelength, angle of wavenumber vector, and bottom-trapping depth confirm that the observed near 35-h TRWs are plausible in the study area. Energetic TRWs are observed in September and October, during the sea-ice free season, while weak TRWs in other sea-ice covered months. Overall, TRW events coincide with strong wind-stress events around the study area, suggesting that the TRWs are triggered by atmospheric forcings. These findings imply that increasing sea-ice loss can result in the generation of more energetic TRWs, which could play an important role in water exchange between the shallow continental shelf and deep ocean.
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URI
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https://repository.kopri.re.kr/handle/201206/12624
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Conference Name
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Ocean Sciences Meeting 2020
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Conference Place
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San Diego Convention Center
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Conference Date
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2020.02.16~2020.02.21
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Type
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Proceeding
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Indexed
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Pro(초록)국외
- Appears in Collections
- 2020-2020, Korea-Arctic Ocean Observing System(K-AOOS) (20-20) / Kang, Sung-Ho (PM20040)
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