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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Upwelling in the Northern Black Sea: Description, Mechanisms and Impact on Chlorophyll-A concentrationкнига
- Автор: Polonsky A.
- Год издания: 2013
- Место издания: Nova Science Publishers, Inc New York, USA
- Объём: 76 страниц
- Монография
- Аннотация: Upwelling manifestations in the Nothern Black Sea are described using long-term hydrometeorological routine observations and satellite data on the sea surface temperature and chlorophyll-A concentration for the warm season (May through October). It is shown that upwelling in the Nothern Black Sea coastal zone is mostly due to rundown or/and Ekman mechanisms and is generated locally under certain wind conditions. During upwelling development, the sea surface cooling exceeds 5°C per 12 hours. Typical duration of an upwelling event is several days. The maximum cooling (up to 22°C) is observed in the coastal regions with narrow shelf. The typical number of upwelling events is one to four per warm season. There is also a rarer type of frontal upwelling which is generated at the edge of meandering Rim current and does not depend on the local wind. So, upwelling in the Northern Black Sea is a sporadic short-term event. However, climatic variations of regional temperature regime depend significantly on the upwelling parameters which are characterized by intense interannual-to-multidecadal variability. In general, long-term weakening of the rundown winds leads to positive trend of surface temperature in the warm season which reaches about 3°C per 50 yrs in some subregions. Upwelling events are accompanied by significant changes of chlorophyll-A concentration in the surface layer of the Northern Black Sea. Lead-lag relation between variations of the sea surface temperature and chlorophyll-A concentration varies from one sub-region to another and crucially depends on the vertical structure of chlorophyll-A concentration.
- Добавил в систему: Полонский Александр Борисович