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Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific
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| Zeitschriftentitel: | Journal of Physical Oceanography |
|---|---|
| Personen und Körperschaften: | , , , , , |
| In: | Journal of Physical Oceanography, 47, 2017, 6, S. 1221-1242 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
| veröffentlicht: |
American Meteorological Society
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| Schlagwörter: |
| author_facet |
Srinivasan, Kaushik McWilliams, James C. Renault, Lionel Hristova, Hristina G. Molemaker, Jeroen Kessler, William S. Srinivasan, Kaushik McWilliams, James C. Renault, Lionel Hristova, Hristina G. Molemaker, Jeroen Kessler, William S. |
|---|---|
| author |
Srinivasan, Kaushik McWilliams, James C. Renault, Lionel Hristova, Hristina G. Molemaker, Jeroen Kessler, William S. |
| spellingShingle |
Srinivasan, Kaushik McWilliams, James C. Renault, Lionel Hristova, Hristina G. Molemaker, Jeroen Kessler, William S. Journal of Physical Oceanography Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific Oceanography |
| author_sort |
srinivasan, kaushik |
| spelling |
Srinivasan, Kaushik McWilliams, James C. Renault, Lionel Hristova, Hristina G. Molemaker, Jeroen Kessler, William S. 0022-3670 1520-0485 American Meteorological Society Oceanography http://dx.doi.org/10.1175/jpo-d-16-0216.1 <jats:title>Abstract</jats:title><jats:p>The distribution and strength of submesoscale (SM) surface layer fronts and filaments generated through mixed layer baroclinic energy conversion and submesoscale coherent vortices (SCVs) generated by topographic drag are analyzed in numerical simulations of the near-surface southwestern Pacific, north of 16°S. In the Coral Sea a strong seasonal cycle in the surface heat flux leads to a winter SM “soup” consisting of baroclinic mixed layer eddies (MLEs), fronts, and filaments similar to those seen in other regions farther away from the equator. However, a strong wind stress seasonal cycle, largely in sync with the surface heat flux cycle, is also a source of SM processes. SM restratification fluxes show distinctive signatures corresponding to both surface cooling and wind stress. The winter peak in SM activity in the Coral Sea is not in phase with the summer dominance of the mesoscale eddy kinetic energy in the region, implying that local surface layer forcing effects are more important for SM generation than the nonlocal eddy deformation field. In the topographically complex Solomon and Bismarck Seas, a combination of equatorial proximity and boundary drag generates SCVs with large-vorticity Rossby numbers (Ro ~ 10). River outflows in the Bismarck and Solomon Seas make a contribution to SM generation, although they are considerably weaker than the topographic effects. Mean to eddy kinetic energy conversions implicate barotropic instability in SM topographic wakes, with the strongest values seen north of the Vitiaz Strait along the coast of Papua New Guinea.</jats:p> Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific Journal of Physical Oceanography |
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American Meteorological Society, 2017 |
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American Meteorological Society, 2017 |
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0022-3670 1520-0485 |
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Journal of Physical Oceanography |
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| title |
Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_unstemmed |
Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_full |
Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_fullStr |
Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_full_unstemmed |
Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_short |
Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_sort |
topographic and mixed layer submesoscale currents in the near-surface southwestern tropical pacific |
| topic |
Oceanography |
| url |
http://dx.doi.org/10.1175/jpo-d-16-0216.1 |
| publishDate |
2017 |
| physical |
1221-1242 |
| description |
<jats:title>Abstract</jats:title><jats:p>The distribution and strength of submesoscale (SM) surface layer fronts and filaments generated through mixed layer baroclinic energy conversion and submesoscale coherent vortices (SCVs) generated by topographic drag are analyzed in numerical simulations of the near-surface southwestern Pacific, north of 16°S. In the Coral Sea a strong seasonal cycle in the surface heat flux leads to a winter SM “soup” consisting of baroclinic mixed layer eddies (MLEs), fronts, and filaments similar to those seen in other regions farther away from the equator. However, a strong wind stress seasonal cycle, largely in sync with the surface heat flux cycle, is also a source of SM processes. SM restratification fluxes show distinctive signatures corresponding to both surface cooling and wind stress. The winter peak in SM activity in the Coral Sea is not in phase with the summer dominance of the mesoscale eddy kinetic energy in the region, implying that local surface layer forcing effects are more important for SM generation than the nonlocal eddy deformation field. In the topographically complex Solomon and Bismarck Seas, a combination of equatorial proximity and boundary drag generates SCVs with large-vorticity Rossby numbers (Ro ~ 10). River outflows in the Bismarck and Solomon Seas make a contribution to SM generation, although they are considerably weaker than the topographic effects. Mean to eddy kinetic energy conversions implicate barotropic instability in SM topographic wakes, with the strongest values seen north of the Vitiaz Strait along the coast of Papua New Guinea.</jats:p> |
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| author | Srinivasan, Kaushik, McWilliams, James C., Renault, Lionel, Hristova, Hristina G., Molemaker, Jeroen, Kessler, William S. |
| author_facet | Srinivasan, Kaushik, McWilliams, James C., Renault, Lionel, Hristova, Hristina G., Molemaker, Jeroen, Kessler, William S., Srinivasan, Kaushik, McWilliams, James C., Renault, Lionel, Hristova, Hristina G., Molemaker, Jeroen, Kessler, William S. |
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| description | <jats:title>Abstract</jats:title><jats:p>The distribution and strength of submesoscale (SM) surface layer fronts and filaments generated through mixed layer baroclinic energy conversion and submesoscale coherent vortices (SCVs) generated by topographic drag are analyzed in numerical simulations of the near-surface southwestern Pacific, north of 16°S. In the Coral Sea a strong seasonal cycle in the surface heat flux leads to a winter SM “soup” consisting of baroclinic mixed layer eddies (MLEs), fronts, and filaments similar to those seen in other regions farther away from the equator. However, a strong wind stress seasonal cycle, largely in sync with the surface heat flux cycle, is also a source of SM processes. SM restratification fluxes show distinctive signatures corresponding to both surface cooling and wind stress. The winter peak in SM activity in the Coral Sea is not in phase with the summer dominance of the mesoscale eddy kinetic energy in the region, implying that local surface layer forcing effects are more important for SM generation than the nonlocal eddy deformation field. In the topographically complex Solomon and Bismarck Seas, a combination of equatorial proximity and boundary drag generates SCVs with large-vorticity Rossby numbers (Ro ~ 10). River outflows in the Bismarck and Solomon Seas make a contribution to SM generation, although they are considerably weaker than the topographic effects. Mean to eddy kinetic energy conversions implicate barotropic instability in SM topographic wakes, with the strongest values seen north of the Vitiaz Strait along the coast of Papua New Guinea.</jats:p> |
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| imprint_str_mv | American Meteorological Society, 2017 |
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| issn | 0022-3670, 1520-0485 |
| issn_str_mv | 0022-3670, 1520-0485 |
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| spelling | Srinivasan, Kaushik McWilliams, James C. Renault, Lionel Hristova, Hristina G. Molemaker, Jeroen Kessler, William S. 0022-3670 1520-0485 American Meteorological Society Oceanography http://dx.doi.org/10.1175/jpo-d-16-0216.1 <jats:title>Abstract</jats:title><jats:p>The distribution and strength of submesoscale (SM) surface layer fronts and filaments generated through mixed layer baroclinic energy conversion and submesoscale coherent vortices (SCVs) generated by topographic drag are analyzed in numerical simulations of the near-surface southwestern Pacific, north of 16°S. In the Coral Sea a strong seasonal cycle in the surface heat flux leads to a winter SM “soup” consisting of baroclinic mixed layer eddies (MLEs), fronts, and filaments similar to those seen in other regions farther away from the equator. However, a strong wind stress seasonal cycle, largely in sync with the surface heat flux cycle, is also a source of SM processes. SM restratification fluxes show distinctive signatures corresponding to both surface cooling and wind stress. The winter peak in SM activity in the Coral Sea is not in phase with the summer dominance of the mesoscale eddy kinetic energy in the region, implying that local surface layer forcing effects are more important for SM generation than the nonlocal eddy deformation field. In the topographically complex Solomon and Bismarck Seas, a combination of equatorial proximity and boundary drag generates SCVs with large-vorticity Rossby numbers (Ro ~ 10). River outflows in the Bismarck and Solomon Seas make a contribution to SM generation, although they are considerably weaker than the topographic effects. Mean to eddy kinetic energy conversions implicate barotropic instability in SM topographic wakes, with the strongest values seen north of the Vitiaz Strait along the coast of Papua New Guinea.</jats:p> Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific Journal of Physical Oceanography |
| spellingShingle | Srinivasan, Kaushik, McWilliams, James C., Renault, Lionel, Hristova, Hristina G., Molemaker, Jeroen, Kessler, William S., Journal of Physical Oceanography, Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific, Oceanography |
| title | Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_full | Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_fullStr | Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_full_unstemmed | Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_short | Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| title_sort | topographic and mixed layer submesoscale currents in the near-surface southwestern tropical pacific |
| title_unstemmed | Topographic and Mixed Layer Submesoscale Currents in the Near-Surface Southwestern Tropical Pacific |
| topic | Oceanography |
| url | http://dx.doi.org/10.1175/jpo-d-16-0216.1 |