Long Term Upwelling Activity along the Moroccan Atlantic Coast
| Autor: | HILMI, Karim, BESSA, Ismail, MAKAOUI, Ahmed, HOUSSA, Rachid, IDRISSI, Mohammed, ETTAHIRI, Omar, EL AOUNI, Anass |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| DOI: | 10.34874/imist.prsm/fsejournal-v11i1.29233 |
| Popis: | The long term activity of the upwelling along the Moroccan Atlantic coast between Cape Blanc (21��N) and Cape Spartel (36��N) is investigated in this work using a monthly Ekman Upwelling Index over the period 1967-2019 (53 years). Three stations that are representative of the upwelling���s activity along the Moroccan Atlantic coast from North to South were selected in this study for analysis: ST5 (31��N-10.5��W) between Cape Sim and Cape Ghir, ST7 (29��N-10.5�� W) between Cape Ghir and Cape Draa and ST12 (24.5��N-15.5��W) North Dakhla between Cape Boujdor and Cape Barbas. The results show a seasonal variability in the northern area between Cape Juby ��� Cape Spartel and a permanent activity mostly all the year in the southern area between Cape Juby - Cape Blanc. Strongest activities of upwelling were observed during summer seasons in the northern area, in particular over the period 1998-2003, and its activity slightly exceeded the average over the periods 1972-1977, 1980-1984, 2004-2008. The weakest upwelling activities in this region were observed in the fall-winter seasons, particularly during the periods 1967-1970, 1995-1998 and 2000-2005. In the southern area, the upwelling variations showed strong upwelling activity in summer over the periods 1967-1980 and 2009-2019, with annual and interannual variability between these two periods. This activity was slightly above average in summer over the 1981-2007 period, except for the years 1982-1983, 1988-1989, 1995-1997 and 2004-2007 where a relative downward trend was observed. Lower upwelling activities were observed in this area over the 2003-2010 period in fall /winter seasons. Frontiers in Science and Engineering, Vol 11, No 1 (2021): The Marine Environment of the Moroccan Atlantic Coast |
| Databáze: | OpenAIRE |
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