KOPRI Repository

Variability of topographic Rossby waves observed on the shelfbreak of the Chukchi Sea

Cited 0 time in wos
Cited 0 time in scopus
Title
Variability of topographic Rossby waves observed on the shelfbreak of the Chukchi Sea
Other Titles
척치해 대륙붕단에서 관측된 지형적 로스비파의 변동성
Authors
Ku, Ahyoung
Park, Jae-Hun
Seung, Young Ho
Jeon, Chanhyung
Choi, Youngseok
Shimada, Koji
Cho, Kyoung-Ho
Yoshizawa, Eri
Keywords
Topographic Rossby Wavesslope currentwestern Arctic Ocean
Issue Date
2020
Citation
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.
Abstract
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.
URI
https://repository.kopri.re.kr/handle/201206/12624
Conference Name
Ocean Sciences Meeting 2020
Conference Place
San Diego Convention Center
Conference Date
2020.02.16~2020.02.21
Type
Proceeding
Indexed
Pro(초록)국외
Appears in Collections  
2020-2020, Korea-Arctic Ocean Observing System(K-AOOS) (20-20) / Kang, Sung-Ho (PM20040)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse