Wind-Induced Topographic Rossby Waves in the Southwestern Slope of the Chukchi Abyssal Plain
Name
phoc-JPO-D-25-0006.1.pdf
Description
Published version
Size
30.84 MB
Format
Adobe PDF
Checksum (MD5)
9ac1b1ce8274613c9b84d08385411f6d
Author(s)
Ku, Ahyoung
Donohue, Kathleen A
Watts, D Randolph
Kim, Kiduk
Song, Hajin
Jeon, Chanhyung
Park, Taewook
Cho, Kyoung-Ho
Peacock, Thomas
Park, Jae-Hun
Date Issued
December 1, 2025
Journal
Journal of Physical Oceanography
Publisher
American Meteorological Society
Citation
Ku, A., and Coauthors, 2025: Wind-Induced Topographic Rossby Waves in the Southwestern Slope of the Chukchi Abyssal Plain. J. Phys. Oceanogr., 55, 2335–2347.
Version
Final published version
Abstract
Near-bottom currents collected over 1 year (August 2021–22) using a current- and pressure-recording inverted echo sounder (CPIES) at a depth of 1060 m showed fluctuations within a frequency band between 2 and 6.5 days near the southwestern slope of the Chukchi Abyssal Plain. The amplitude of the fluctuations was approximately 8 cm s−1 on average during the summer months and weakened to approximately 3 cm s−1 between February and June 2022. Similar fluctuations were reproduced by the data-assimilated Hybrid Coordinate Ocean Model (HYCOM), confirming that they were bottom intensified. Calculations of the bottom-trapping scale using HYCOM revealed that these fluctuations could be attributed to topographic Rossby waves (TRWs) with a length scale of approximately 50 km. The spatial distributions of TRWs in HYCOM and ray-tracing results suggest that TRWs likely propagated from the west-southwest. It is suggested that these TRWs were triggered by nonlocal wind stress curl (WSC), 220 km to the west along the continental slope, as the coherence in the TRW frequency band between the TRWs and WSC was significant. The weaker TRW signal from February to June 2022 was related to weaker WSC and higher sea ice concentration in the study area. The stronger TRWs from July to October occurred when the WSC was stronger and the sea ice concentration was lower in the study area. Our findings imply that changes in the Arctic WSC field or a longer sea ice–free season could trigger more energetic and frequent TRWs, observable down to 1000-m depth around the southwestern slope of the Chukchi Abyssal Plain.
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1175/JPO-D-25-0006.1
