کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4542030 1326749 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Seasonal observations of surface waters in two Gulf of Maine estuary-plume systems: Relationships between watershed attributes, optical measurements and surface pCO2
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Seasonal observations of surface waters in two Gulf of Maine estuary-plume systems: Relationships between watershed attributes, optical measurements and surface pCO2
چکیده انگلیسی

The partial pressure of carbon dioxide (pCO2) in estuary-plume systems is related to the internal processes of net organic metabolism and physical mixing, but is also strongly influenced by biogeochemical inputs from the land and ocean. Surface layer pCO2, stimulated fluorescence of chlorophyll (f-chl) and colored organic matter (f-com), and beam attenuation at 660 nm (c-660) were measured during three seasonal surveys of the Kennebec (ME) and Merrimack (MA) estuary-plume systems. These estuaries are both supplied by large New England Rivers and separated by less than 150 km, but significant differences were often observed in the distributions of surface pCO2 and optical variables. High pCO2 concentrations were generally associated with high f-com, while lower pCO2 concentrations were associated with high f-chl and c-660. Using simple regression models, optical measurements were used to estimate chlorophyll and total organic carbon concentrations. Results suggest that labile riverine carbon is responsible for sustaining supersaturated pCO2 conditions and that phytoplankton productivity, likely driven by inputs of riverine dissolved inorganic nitrogen, is responsible for pCO2 undersaturation. Although optical variables are often related to surface pCO2, the results suggest that efforts to retrieve pCO2 in complex waters using optical data may be enhanced using a site-specific, multivariate approach.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 77, Issue 2, 10 April 2008, Pages 245–252
نویسندگان
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