کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4539149 1626618 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Light absorption properties of CDOM in the Changjiang (Yangtze) estuarine and coastal waters: An alternative approach for DOC estimation
ترجمه فارسی عنوان
خواص جذب نور CDOM در دهانه رودخانه Changjiang (یانگ تسه) و آب‌های ساحلی: یک روش جایگزین برای تخمین DOC
کلمات کلیدی
جذب نور؛ CDOM؛ DOC؛ شوری؛خور Changjiang (یانگ تسه)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


• Spatial-temporal variations of CDOM properties in the Changjiang estuarine and coastal waters are characterized.
• Inter-comparison on the variation of CDOM and DOC among world's major estuarine and coastal waters is presented.
• Controlling factors of the distribution of CDOM properties in the estuary are analyzed.
• A robust non-linear model to retrieve DOC concentration is proposed.

Field measurements of CDOM absorption properties and DOC concentrations were collected in the Changjiang estuarine and coastal waters from 2011 to 2013. CDOM absorption coefficient at 355 nm (ag (355)) was found to be inversely correlated with salinity, with Pearson's coefficients r of −0.901 and −0.826 for summer and winter observations, respectively. Analysis results of the relationships between salinity and CDOM optical properties (i.e., absorption coefficient and spectral slope) suggested that terrigenous inputs dominated CDOM sources in the Changjiang estuary, but the proportion of terrigenous CDOM declined with increasing salinity. The level of CDOM in the Changjiang estuary was lower compared to some of the major estuaries in the world, which could be attributed to several controlling factors such as vegetation cover in the drainage basin, the origin of recharged streams and high sediment load in the Changjiang estuary. We further evaluated the relationships between CDOM and DOC and their mixing behavior among world's major estuaries. An empirical model was finally developed to estimate DOC concentration from ag (355) and spectral slope S275-295 using a non-linear regression. This empirical relationship was calibrated using the Cal dataset, and was validated with the Val dataset, resulting in an acceptable error with the R2 of 0.746, the RMSE of 20.99 μmol/L and the rMAD of 14.46%.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 181, 5 November 2016, Pages 302–311
نویسندگان
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