under a Creative Commons License. Ocean Science Unpredictability of internal M2
Abstract. Current observations from a shelf sea, continental slopes and the abyssal North-East Atlantic Ocean are all dominated by the semidiurnal lunar (M2) tide. It is shown that motions at M2 vary at usually large barotropic and coherent baroclinic scales,>50 km horizontally and>0.5 H verti...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.382.5705 2023-05-15T17:38:35+02:00 under a Creative Commons License. Ocean Science Unpredictability of internal M2 H. Van Haren The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.5705 http://hal.archives-ouvertes.fr/docs/00/29/83/39/PDF/os-3-337-2007.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.5705 http://hal.archives-ouvertes.fr/docs/00/29/83/39/PDF/os-3-337-2007.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://hal.archives-ouvertes.fr/docs/00/29/83/39/PDF/os-3-337-2007.pdf text ftciteseerx 2016-09-18T00:26:19Z Abstract. Current observations from a shelf sea, continental slopes and the abyssal North-East Atlantic Ocean are all dominated by the semidiurnal lunar (M2) tide. It is shown that motions at M2 vary at usually large barotropic and coherent baroclinic scales,>50 km horizontally and>0.5 H vertically. H represents the waterdepth. Such M2-scales are observed even close to topography, the potential source of baroclinic, “internal ” tidal waves. In contrast, incoherent smallscale, ∼10 km horizontally and ∼0.1 H vertically, baroclinic motions are dominated around f, the local inertial frequency, and/or near 2�≈S2, the semidiurnal solar tidal frequency. � represents the Earth’s rotational vector. This confirms earlier suggestions that small-scale baroclinic M2-motions generally do not exist in the ocean in any predictable manner, except in beams very near, <10 km horizontally, to their source. As a result, M2-motions are not directly important for generating shear and internal wave induced mixing. Indirectly however, they may contribute to ocean mixing if transfer to small-scale motions at f and/or S2 and at high internal wave frequencies can be proven. Also far from topography, smallscale motions are found at either one or both of the latter frequencies. Different suggestions for the scales at these particular frequencies are discussed, ranging from the variability of “background ” density gradients and associated divergence and focusing of internal wave rays to the removal of the internal tidal energy by non-linear interactions. Near f and S2 particular short-wave inertio-gravity wave bounds are found in the limits of strong and very weak stratification, which are often observed in small-scale layers. 1 Text North East Atlantic Unknown |
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Abstract. Current observations from a shelf sea, continental slopes and the abyssal North-East Atlantic Ocean are all dominated by the semidiurnal lunar (M2) tide. It is shown that motions at M2 vary at usually large barotropic and coherent baroclinic scales,>50 km horizontally and>0.5 H vertically. H represents the waterdepth. Such M2-scales are observed even close to topography, the potential source of baroclinic, “internal ” tidal waves. In contrast, incoherent smallscale, ∼10 km horizontally and ∼0.1 H vertically, baroclinic motions are dominated around f, the local inertial frequency, and/or near 2�≈S2, the semidiurnal solar tidal frequency. � represents the Earth’s rotational vector. This confirms earlier suggestions that small-scale baroclinic M2-motions generally do not exist in the ocean in any predictable manner, except in beams very near, <10 km horizontally, to their source. As a result, M2-motions are not directly important for generating shear and internal wave induced mixing. Indirectly however, they may contribute to ocean mixing if transfer to small-scale motions at f and/or S2 and at high internal wave frequencies can be proven. Also far from topography, smallscale motions are found at either one or both of the latter frequencies. Different suggestions for the scales at these particular frequencies are discussed, ranging from the variability of “background ” density gradients and associated divergence and focusing of internal wave rays to the removal of the internal tidal energy by non-linear interactions. Near f and S2 particular short-wave inertio-gravity wave bounds are found in the limits of strong and very weak stratification, which are often observed in small-scale layers. 1 |
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The Pennsylvania State University CiteSeerX Archives |
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H. Van Haren |
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H. Van Haren under a Creative Commons License. Ocean Science Unpredictability of internal M2 |
author_facet |
H. Van Haren |
author_sort |
H. Van Haren |
title |
under a Creative Commons License. Ocean Science Unpredictability of internal M2 |
title_short |
under a Creative Commons License. Ocean Science Unpredictability of internal M2 |
title_full |
under a Creative Commons License. Ocean Science Unpredictability of internal M2 |
title_fullStr |
under a Creative Commons License. Ocean Science Unpredictability of internal M2 |
title_full_unstemmed |
under a Creative Commons License. Ocean Science Unpredictability of internal M2 |
title_sort |
under a creative commons license. ocean science unpredictability of internal m2 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.5705 http://hal.archives-ouvertes.fr/docs/00/29/83/39/PDF/os-3-337-2007.pdf |
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North East Atlantic |
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North East Atlantic |
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http://hal.archives-ouvertes.fr/docs/00/29/83/39/PDF/os-3-337-2007.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.382.5705 http://hal.archives-ouvertes.fr/docs/00/29/83/39/PDF/os-3-337-2007.pdf |
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