Observation of Bottom‐Trapped Topographic Rossby Waves on the Shelf Break of the Chukchi Sea
Name
JGR Oceans - 2020 - Ku - Observation of Bottom‐Trapped Topographic Rossby Waves on the Shelf Break of the Chukchi Sea.pdf
Description
Published version
Size
9.65 MB
Format
Adobe PDF
Checksum (MD5)
4c2e4990288eeefff0c5e8602cc939a5
Author(s)
Ku, Ahyoung
Seung, Young Ho
Jeon, Chanhyung
Choi, Youngseok
Yoshizawa, Eri
Shimada, Koji
Cho, Kyoung‐Ho
Park, Jae‐Hun
Date Issued
June 10, 2020
Journal
Journal of Geophysical Research: Oceans
Publisher
American Geophysical Union
Citation
Ku, A., Seung, Y. H., Jeon, C., Choi, Y., Yoshizawa, E., Shimada, K., et al. (2020). Observation of bottom-trapped topographic Rossby waves on the shelf break of the Chukchi Sea. Journal of Geophysical Research: Oceans, 125, e2019JC015436.
Version
Final published version
Abstract
This study investigates topographic Rossby waves (TRWs) with a period of approximately 35 hr 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 1 year from August 2014 to August 2015. The observations reveal that the bottom‐intensified upslope 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 upslope (downslope) currents. Theoretical estimates of the wavelength, angle of wavenumber vector, and bottom‐trapping depth confirmed that the observed near 35‐hr 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.
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DOI of Published Version
https://doi.org/10.1029/2019jc015436
