Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source
Although the semidiurnal internal tide dominates internal motions at all sites studied to date off Mexico, a diurnal signal was detected on the shelf of the California Current System off Baja California Sur, even though the barotropic tide is exponentially stronger in the semidiurnal frequency alon...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Universidad Autónoma de Baja California
2017-12-01
|
| Series: | Ciencias Marinas |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2785 |
| _version_ | 1827330984407728128 |
|---|---|
| author | Lydia Betty Ladah James J Leichter Anatoliy Filonov Iryna Tereshchenko |
| author_facet | Lydia Betty Ladah James J Leichter Anatoliy Filonov Iryna Tereshchenko |
| author_sort | Lydia Betty Ladah |
| collection | DOAJ |
| description |
Although the semidiurnal internal tide dominates internal motions at all sites studied to date off Mexico, a diurnal signal was detected on the shelf of the California Current System off Baja California Sur, even though the barotropic tide is exponentially stronger in the semidiurnal frequency along this coastline. In this study, diurnal thermocline shoaling events were measured in kelp beds in late summer and fall of 2004, very near their southern limit in the Northern Hemisphere. Sub-thermocline water bathed the base of the kelp beds at a diurnal frequency. Nitrate concentrations up to 1.4 µmol·L–1 were found in this sub-thermocline water of almost 20 ºC entering the kelp beds, which is a much greater concentration of nitrate at this temperature than is typical for the California Current. Nitrate-rich pulses lasted from 35 min to 19 h and reduced bottom temperatures up to 5 ºC in 1 h. The periodicity of temperature variability at the moorings showed significant coherence with the diurnal variability in zonal winds (>95% confidence interval) and was not coherent with the semidiurnal tide. We propose that windforced, diurnal internal motions may provide an important nutrient source for primary producers during reduced upwelling periods and merit further study as a fertilization source in the southern part of the California Current System.
|
| first_indexed | 2024-03-07T16:26:24Z |
| format | Article |
| id | doaj.art-3364be6567984d71955b32d7f7896f44 |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:26:24Z |
| publishDate | 2017-12-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-3364be6567984d71955b32d7f7896f442024-03-03T17:43:42ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532017-12-0143410.7773/cm.v43i4.2785Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient sourceLydia Betty Ladah0James J Leichter1Anatoliy Filonov2Iryna Tereshchenko3Centro de Investigación Científica y de Educación Superior de Ensenada.Scripps Institution of Oceanography.Universidad de Guadalajara.Universidad de Guadalajara. Although the semidiurnal internal tide dominates internal motions at all sites studied to date off Mexico, a diurnal signal was detected on the shelf of the California Current System off Baja California Sur, even though the barotropic tide is exponentially stronger in the semidiurnal frequency along this coastline. In this study, diurnal thermocline shoaling events were measured in kelp beds in late summer and fall of 2004, very near their southern limit in the Northern Hemisphere. Sub-thermocline water bathed the base of the kelp beds at a diurnal frequency. Nitrate concentrations up to 1.4 µmol·L–1 were found in this sub-thermocline water of almost 20 ºC entering the kelp beds, which is a much greater concentration of nitrate at this temperature than is typical for the California Current. Nitrate-rich pulses lasted from 35 min to 19 h and reduced bottom temperatures up to 5 ºC in 1 h. The periodicity of temperature variability at the moorings showed significant coherence with the diurnal variability in zonal winds (>95% confidence interval) and was not coherent with the semidiurnal tide. We propose that windforced, diurnal internal motions may provide an important nutrient source for primary producers during reduced upwelling periods and merit further study as a fertilization source in the southern part of the California Current System. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2785 |
| spellingShingle | Lydia Betty Ladah James J Leichter Anatoliy Filonov Iryna Tereshchenko Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source Ciencias Marinas |
| title | Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source |
| title_full | Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source |
| title_fullStr | Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source |
| title_full_unstemmed | Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source |
| title_short | Diurnal frequency internal waves in the southern part of the California Current ecosystem as a nutrient source |
| title_sort | diurnal frequency internal waves in the southern part of the california current ecosystem as a nutrient source |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2785 |
| work_keys_str_mv | AT lydiabettyladah diurnalfrequencyinternalwavesinthesouthernpartofthecaliforniacurrentecosystemasanutrientsource AT jamesjleichter diurnalfrequencyinternalwavesinthesouthernpartofthecaliforniacurrentecosystemasanutrientsource AT anatoliyfilonov diurnalfrequencyinternalwavesinthesouthernpartofthecaliforniacurrentecosystemasanutrientsource AT irynatereshchenko diurnalfrequencyinternalwavesinthesouthernpartofthecaliforniacurrentecosystemasanutrientsource |