Internal waves and temperature fronts on slopes
Time series measurements from an array of temperature miniloggers in a line at constant depth along the sloping boundary of a lake are used to describe the `internal surf zone' where internal waves interact with the sloping boundary. More small positive temperature time derivatives are reco...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
1999-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/17/1227/1999/angeo-17-1227-1999.pdf |
| _version_ | 1819236198095257600 |
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| author | S. A. Thorpe S. A. Thorpe U. Lemmin |
| author_facet | S. A. Thorpe S. A. Thorpe U. Lemmin |
| author_sort | S. A. Thorpe |
| collection | DOAJ |
| description | Time series measurements from an array of
temperature miniloggers in a line at constant depth along the sloping boundary
of a lake are used to describe the `internal surf zone' where internal waves
interact with the sloping boundary. More small positive temperature time
derivatives are recorded than negative, but there are more large negative values
than positive, giving the overall distribution of temperature time derivatives a
small negative skewness. This is consistent with the internal wave dynamics;
fronts form during the up-slope phase of the motion, bringing cold water up the
slope, and the return flow may become unstable, leading to small advecting
billows and weak warm fronts. The data are analysed to detect `events', periods
in which the temperature derivatives exceed a set threshold. The speed and
distance travelled by `events' are described. The motion along the slope may be
a consequence of (a) instabilities advected by the flow (b) internal waves
propagating along-slope or (c) internal waves approaching the slope from oblique
directions. The propagation of several of the observed 'events' can only be
explained by (c), evidence that the internal surf zone has some, but possibly
not all, the characteristics of the conventional 'surface wave' surf zone, with
waves steepening as they approach the slope at oblique angles.<br><br><b>Key words.</b> Oceanography: general (benthic boundary
layers; limnology), Oceanography: physical (internal and inertial waves) |
| first_indexed | 2024-12-23T13:00:37Z |
| format | Article |
| id | doaj.art-c9796a4c5987417fbf6fb8aca14bd6e9 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-23T13:00:37Z |
| publishDate | 1999-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-c9796a4c5987417fbf6fb8aca14bd6e92022-12-21T17:46:02ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761999-09-01171227123410.1007/s00585-999-1227-6Internal waves and temperature fronts on slopesS. A. Thorpe0S. A. Thorpe1U. Lemmin2Fax: +44 1703 593059; e-mail: sxt@soc.soton.ac.ukSOES, Southampton Oceanography Centre, European Way, Southampton, SO14 3ZH, UKLRH, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, SwitzerlandTime series measurements from an array of temperature miniloggers in a line at constant depth along the sloping boundary of a lake are used to describe the `internal surf zone' where internal waves interact with the sloping boundary. More small positive temperature time derivatives are recorded than negative, but there are more large negative values than positive, giving the overall distribution of temperature time derivatives a small negative skewness. This is consistent with the internal wave dynamics; fronts form during the up-slope phase of the motion, bringing cold water up the slope, and the return flow may become unstable, leading to small advecting billows and weak warm fronts. The data are analysed to detect `events', periods in which the temperature derivatives exceed a set threshold. The speed and distance travelled by `events' are described. The motion along the slope may be a consequence of (a) instabilities advected by the flow (b) internal waves propagating along-slope or (c) internal waves approaching the slope from oblique directions. The propagation of several of the observed 'events' can only be explained by (c), evidence that the internal surf zone has some, but possibly not all, the characteristics of the conventional 'surface wave' surf zone, with waves steepening as they approach the slope at oblique angles.<br><br><b>Key words.</b> Oceanography: general (benthic boundary layers; limnology), Oceanography: physical (internal and inertial waves)https://www.ann-geophys.net/17/1227/1999/angeo-17-1227-1999.pdf |
| spellingShingle | S. A. Thorpe S. A. Thorpe U. Lemmin Internal waves and temperature fronts on slopes Annales Geophysicae |
| title | Internal waves and temperature fronts on slopes |
| title_full | Internal waves and temperature fronts on slopes |
| title_fullStr | Internal waves and temperature fronts on slopes |
| title_full_unstemmed | Internal waves and temperature fronts on slopes |
| title_short | Internal waves and temperature fronts on slopes |
| title_sort | internal waves and temperature fronts on slopes |
| url | https://www.ann-geophys.net/17/1227/1999/angeo-17-1227-1999.pdf |
| work_keys_str_mv | AT sathorpe internalwavesandtemperaturefrontsonslopes AT sathorpe internalwavesandtemperaturefrontsonslopes AT ulemmin internalwavesandtemperaturefrontsonslopes |