کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6386830 1627288 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Atmospheric outflow of nutrients to the Bay of Bengal: Impact of anthropogenic sources
ترجمه فارسی عنوان
خروج جوی مواد مغذی در خلیج بنگال: تاثیر منابع آلودگی
کلمات کلیدی
خروجی جوی، مواد مغذی دشت هند گنگی، خلیج بنگال، سوختن زیست توده، انتشارات، نیتروژن آلی، فسفر قابل حل، آهن قابل حل
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی


- Nutrients in the atmospheric outflow from Indo-Gangetic Plain to the Bay of Bengal
- All nutrients show pronounced temporal variability in the outflow.
- The inorganic nitrogen dominates the total soluble nitrogen.
- Biomass burning emissions are a significant source of nutrients in the outflow.

The air-sea deposition of nutrients (N, P and Fe) to the oceanic regions located downwind of pollution sources in south and south-east Asia is gaining considerable attention in the present-day scenario of climate change. We report here a case study on the atmospheric outflow of nutrients from the Indo-Gangetic Plain (IGP) to the Bay of Bengal (BoB). Air mass back trajectories suggest conspicuous downwind transport of chemical constituents from the IGP to the BoB during the late NE-monsoon (January-April); thus, representing BoB as one of the unique oceanic regions influenced by anthropogenic sources over a short span of 3-4 months. During the course of this study (November'09-March'10), nutrient (NO3−, NH4+, NOrg, PO43 − and Fews) concentrations in the atmospheric outflow show pronounced temporal variability. The inorganic nitrogen (NH4+-N: ~ 90% of NInorg) dominates the total soluble nitrogen (NTot). Although the contribution of organic nitrogen is not significant, the mass ratio of NOrg/NTot in the outflow varied from 0.07 to 0.40. The abundances of PInorg and Fews varied from 0.4 to 4.8 nmol m− 3 and 0.2 to 0.6 nmol m− 3, respectively. The high abundance of K+ and significant (P-value < 0.05) correlation with PInorg and Fews suggest their significant contribution from biomass burning emissions (BBEs). The characteristic mass ratios of nutrients (NInorg/NTot: 0.92 ± 0.13, NOrg/NTot: 0.21 ± 0.11, and PInorg/nss-Ca2 +: 0.35 ± 0.23) in the IGP-outflow show striking similarity with those reported over the BoB. These results have implications to further increase in the atmospheric deposition of nutrients and their impact on biogeochemistry of surface Bay of Bengal.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Marine Systems - Volume 141, January 2015, Pages 34-44
نویسندگان
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