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Observation of Bottom­Trapped Topographic Rossby Waves on the Shelf Break of the Chukchi Sea

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Title
Observation of Bottom­Trapped Topographic Rossby Waves on the Shelf Break of the Chukchi Sea
Other Titles
척치해 대륭붕단에서의 bottom-trapped 지형적 로스비파 관측
Authors
Ku, Ahyoung
Seung, Young Ho
Jeon, Chanhyung
Choi, Youngseok
Yoshizawa, Eri
Shimada, Koji
Cho, Kyoung-Ho
Park, Jae­Hun
Subject
Oceanography
Keywords
bottom-intensified fluctuations; topographic Rossby waves; wind forcing influence
Issue Date
2020-07
Citation
Ku, Ahyoung, et al. 2020. "Observation of Bottom­Trapped Topographic Rossby Waves on the Shelf Break of the Chukchi Sea". JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 125(7): 1-14.
Abstract
This study investigates topographic Rossby waves (TRWs) with a period of approximately 35 h using a mooring observation at 194 m depth on the shelf break of the Chukchi Sea in the Arctic Ocean. We measured velocity, temperature, and salinity for about one year from August 2014 to August 2015. The observations reveal that the bottom-intensified up-slope current fluctuations were significantly coherent with near-bottom temperature fluctuations, with a phase lag of approximately 90°. Near the seafloor, the temperature increased with depth. Therefore, the temperature increases (decreases) with the up-slope (down-slope) currents. Theoretical estimates of the wavelength, angle of wavenumber vector, and bottom-trapping depth confirmed that the observed near 35-h TRWs are indeed plausible in the study area. Energetic TRWs were observed in September and October, during the sea-ice free season, whereas weak TRWs were observed in months with sea ice cover. The TRW events coincided with local wind-stress events, suggesting that the TRWs were triggered by atmospheric forcing. These findings imply that a longer ice-free season may allow for a more frequent occurrence of energetic TRWs, which may enhance the water exchange between the shallow continental shelf and the deep ocean.
URI
https://repository.kopri.re.kr/handle/201206/11960
DOI
http://dx.doi.org/10.1029/2019JC015436
Appears in Collections  
2020-2020, Korea-Arctic Ocean Observing System(K-AOOS) (20-20) / Kang, Sung-Ho (PM20040)
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