Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern Pacific
Abstract Tropical instability waves (TIWs) in the equatorial eastern Pacific exhibit 25–40‐day westward‐propagating fluctuations with seasonal and interannual variations, which are stronger during July–December and La Niña periods. There is evidence that the instability of the equatorial currents th...
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| Format: | Article |
| Language: | English |
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Wiley
2022-08-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL098327 |
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| author | Kang‐Nyeong Lee Chanhyung Jeon YoungHo Seung Hong‐Ryeol Shin Seung‐Kyu Son Jae‐Hun Park |
| author_facet | Kang‐Nyeong Lee Chanhyung Jeon YoungHo Seung Hong‐Ryeol Shin Seung‐Kyu Son Jae‐Hun Park |
| author_sort | Kang‐Nyeong Lee |
| collection | DOAJ |
| description | Abstract Tropical instability waves (TIWs) in the equatorial eastern Pacific exhibit 25–40‐day westward‐propagating fluctuations with seasonal and interannual variations, which are stronger during July–December and La Niña periods. There is evidence that the instability of the equatorial currents that generates TIWs also induce radiation of barotropic Rossby waves (BTRWTIW). Long‐term near‐bottom current measurements at 10.5°N and 131.3°W during 2004–2013 revealed a spectral peak at 25–40 days, where significant coherences were found with satellite‐measured sea surface height with maxima approximately 5°N. Simulated deep currents from a data‐assimilated ocean model concur with the observed near‐bottom currents, and both currents vary seasonally and interannually, consistent with the typical characteristics of TIW. Further analyses using 25–40‐day bandpass‐filtered barotropic velocity data from the model revealed that they reasonably satisfied the theoretical dispersion relation of BTRWTIW. The in situ and model analysis support the conclusion that BTRWTIW propagate north of 10°N in the northeastern Pacific. |
| format | Article |
| id | doaj-art-435ca14f1a9d4e1b865e1f7616c874e6 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
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| series | Geophysical Research Letters |
| spelling | doaj-art-435ca14f1a9d4e1b865e1f7616c874e62025-08-20T02:11:38ZengWileyGeophysical Research Letters0094-82761944-80072022-08-014915n/an/a10.1029/2022GL098327Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern PacificKang‐Nyeong Lee0Chanhyung Jeon1YoungHo Seung2Hong‐Ryeol Shin3Seung‐Kyu Son4Jae‐Hun Park5Department of Ocean Sciences Inha University Incheon South KoreaDepartment of Oceanography Pusan National University Busan South KoreaDepartment of Ocean Sciences Inha University Incheon South KoreaDepartment of Atmospheric Sciences Kongju National University Gongju‐si South KoreaDeep‐Sea and Seabed Mineral Resources Research Center Korea Institute of Ocean Science & Technology Busan South KoreaDepartment of Ocean Sciences Inha University Incheon South KoreaAbstract Tropical instability waves (TIWs) in the equatorial eastern Pacific exhibit 25–40‐day westward‐propagating fluctuations with seasonal and interannual variations, which are stronger during July–December and La Niña periods. There is evidence that the instability of the equatorial currents that generates TIWs also induce radiation of barotropic Rossby waves (BTRWTIW). Long‐term near‐bottom current measurements at 10.5°N and 131.3°W during 2004–2013 revealed a spectral peak at 25–40 days, where significant coherences were found with satellite‐measured sea surface height with maxima approximately 5°N. Simulated deep currents from a data‐assimilated ocean model concur with the observed near‐bottom currents, and both currents vary seasonally and interannually, consistent with the typical characteristics of TIW. Further analyses using 25–40‐day bandpass‐filtered barotropic velocity data from the model revealed that they reasonably satisfied the theoretical dispersion relation of BTRWTIW. The in situ and model analysis support the conclusion that BTRWTIW propagate north of 10°N in the northeastern Pacific.https://doi.org/10.1029/2022GL098327in situ near‐bottom currenttropical instability wavesbarotropic Rossby wavesinterannual variation |
| spellingShingle | Kang‐Nyeong Lee Chanhyung Jeon YoungHo Seung Hong‐Ryeol Shin Seung‐Kyu Son Jae‐Hun Park Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern Pacific Geophysical Research Letters in situ near‐bottom current tropical instability waves barotropic Rossby waves interannual variation |
| title | Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern Pacific |
| title_full | Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern Pacific |
| title_fullStr | Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern Pacific |
| title_full_unstemmed | Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern Pacific |
| title_short | Observational Evidence of Generation and Propagation of Barotropic Rossby Waves Induced by Tropical Instability Waves in the Northeastern Pacific |
| title_sort | observational evidence of generation and propagation of barotropic rossby waves induced by tropical instability waves in the northeastern pacific |
| topic | in situ near‐bottom current tropical instability waves barotropic Rossby waves interannual variation |
| url | https://doi.org/10.1029/2022GL098327 |
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