کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
8885925 1627245 2018 42 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of riverine freshwater forcing on the sea surface salinity simulations in the Indian Ocean
ترجمه فارسی عنوان
تأثیر آب شیرین آب رودخانه بر روی شبیه سازی شوری سطح دریا در اقیانوس
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تولید محتوا
با 10 درصد تخفیف ویژه دانشیاری
کلمات کلیدی
شوری سطح آب تخلیه رودخانه، خلیج بنگال، اقیانوس هند، پر آب شیرین، بودجه نمک،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی
A regional ocean circulation model with eddy-permitting resolution (1/8°) is used to examine the impact of continental (riverine) freshwater discharge on the sea surface salinity (SSS) simulations over the Indian Ocean (IO). The daily climatological atmospheric forcing and monthly river discharges are used to force the ocean model. All the rivers draining into the IO from the Indian subcontinent, Africa, Australia, and Indonesia are incorporated in the model. The validation of numerical simulations shows the model's capability in simulating the surface circulation and space and time variability of SSS over the IO. Two numerical experiments are carried out with different freshwater forcing to identify the impact of river discharges on the salinity variability. The first one, i.e. No-River Experiment (NR-Expt), treats the evaporation (E) and precipitation (P) as the surface freshwater flux (E-P). The riverine freshwater discharge (R) is added to the surface freshwater flux in the second experiment, i.e. River Experiment (R-Expt). The model simulated SSS in the R-Expt shows a better agreement with the observed SSS from Aquarius satellite and buoys, as compared to the NR-Expt. The mixed layer salt budget analysis highlights the dominant contributions from E-P and horizontal advection terms in controlling the mixed layer salinity (MLS) over most of the IO domain. Seasonal variability in the salinity and salt budget terms over the ten hydrologically different regions in the northern and southern tropical IO are analyzed. The northern BoB (N-BoB) found to have the largest impact of river discharges on the SSS and MLS simulations during the southwest monsoon (June-September) season. Freshening up to −4psu with salinity tendency up to −0.05 psu/day is simulated in the N-BoB when river discharges are incorporated in the model. The effect of river discharges on the MLS in the southeastern AS appears in the late winter and pre-monsoon seasons. The eastern equatorial IO (EEIO) acts as a source of low-saline waters in the IO. As compared to the northern IO, the southern tropical IO regions exhibit smaller seasonal variability in the MLS and salinity budget terms. The effect of river discharges on the salinity budget terms is noticed with various temporal scales in the hydrologically different regions over the IO. The sector-wise inter-comparison of the salt budget terms derived from the NR-Expt and R-Expt provides insight into the relative impact of rivers in regulating the salinity variability in different parts of the northern and southern tropical IO.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Marine Systems - Volume 185, September 2018, Pages 40-58
نویسندگان
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