 |
| Titel |
Lagrangian transport in a microtidal coastal area: the Bay of Palma, island of Mallorca, Spain |
| VerfasserIn |
I. Hernández-Carrasco, C. López, A. Orfila, E. Hernández-García |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 5 ; Nr. 20, no. 5 (2013-10-31), S.921-933 |
| Datensatznummer |
250086066
|
| Publikation (Nr.) |
 copernicus.org/npg-20-921-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Coastal transport in the Bay of Palma, a small region in the island of
Mallorca, Spain, is characterized in terms of Lagrangian descriptors. The
data sets used for this study are the output for two months (one in autumn
and one in summer) of a high resolution numerical model, ROMS (Regional Ocean Model System), forced
atmospherically and with a spatial resolution of 300 m. The two months were
selected because of their different wind regime, which is the main driver of the
sea dynamics in this area. Finite-size Lyapunov exponents (FSLEs)
were used to locate semi-persistent Lagrangian coherent structures (LCS) and to understand the different flow
regimes in the bay. The different wind directions and regularity in the two
months have a clear impact on the surface bay dynamics, whereas only
topographic features appear clearly in the bottom structures. The fluid
interchange between the bay and the open ocean was studied by computing
particle trajectories and residence time (RT) maps. The escape rate of
particles out of the bay is qualitatively different, with a 32% greater
escape rate of particles to the ocean in October than in July, owing to the
different geometric characteristics of the flow. We show that LCSs separate
regions with different transport properties by displaying spatial
distributions of residence times on synoptic Lagrangian maps together with
the location of the LCSs. Correlations between the time-dependent behavior of
FSLE and RT are also investigated, showing a negative dependence when the
stirring characterized by FSLE values moves particles in the direction of
escape. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|