کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4551221 1627611 2010 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nutrient characteristics of the water masses and their seasonal variability in the eastern equatorial Indian Ocean
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
پیش نمایش صفحه اول مقاله
Nutrient characteristics of the water masses and their seasonal variability in the eastern equatorial Indian Ocean
چکیده انگلیسی

Nutrient characteristics of four water masses in the light of their thermohaline properties are examined in the eastern Equatorial Indian Ocean during winter, spring and summer monsoon. The presence of low salinity water mass with “Surface enrichments” of inorganic nutrients was observed relative to 20 m in the mixed layer. Lowest oxygen levels of 19 μM at 3°N in the euphotic zone indicate mixing of low oxygen high salinity Arabian Sea waters with the equatorial Indian Ocean. The seasonal variability of nutrients was regulated by seasonally varying physical processes like thermocline elevation, meridional and zonal transport, the equatorial undercurrent and biological processes of uptake and remineralisation. Circulation of Arabian Sea high salinity waters with nitrate deficit could also be seen from low N/P ratio with a minimum of 8.9 in spring and a maximum of 13.6 in winter. This large deviation from Redfield N/P ratio indicates the presence of denitrified high salinity waters with a seasonal nitrate deficit ranging from −4.85 to 1.52 in the Eastern Equatorial Indian Ocean.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Environmental Research - Volume 70, Issues 3–4, September–October 2010, Pages 272–282
نویسندگان
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