کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6384764 1626636 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
18-year variability of ultraviolet radiation penetration in the mid-latitude coastal waters of the western boundary Pacific
ترجمه فارسی عنوان
تغییرات 18 ساله نفوذ اشعه ماوراء بنفش در آبهای ساحلی میانه ای از مرزهای غربی اقیانوس آرام
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی
The 18-year time-series shows in situ ultraviolet radiation (UVR) and photosynthetically active radiation (PAR) diffuse attenuation coefficient Kd(λ) have recurrent seasonal variability of high/low attenuation during summer/winter months, respectively, dependent on variability in water column stratification and concentrations of bio-optical properties. The mid-latitude coastal survey station displayed significant seasonality of the mixed layer depth (MLD) between 12 and 82 m which modified the distribution of chlorophyll a (4.6-24.9 mg m−2) and absorption of colored dissolved organic matter [aCDOM(320 nm) 0.043-1.34 m−1]. The median Kd(320 nm) displayed significant seasonality at 0.19-0.74 m−1 (C.V. = 44.1%) and seasonal variability within the euphotic layer [Z10%(320 nm) = 7-20%]. High attenuation of UVR with relatively moderate attenuation of PAR was consistently observed during the summer months when increased concentrations of terrestrially derived CDOM coupled with a shallow MLD were present. The winter season showed the opposite of low UVR and PAR attenuation due to a relatively deeper MLD coupled with low concentrations of bio-optical properties. Although the long term Kd(λ) did not vary significantly during the time-series, analysis of the interannual variability suggests there are positive and negative phases following the Pacific Decadal Oscillation (PDO) vis-a-vis variability in bio-optical properties (p < 0.001).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 160, 5 July 2015, Pages 1-9
نویسندگان
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