期刊
DYNAMICS OF ATMOSPHERES AND OCEANS
卷 85, 期 -, 页码 1-15出版社
ELSEVIER
DOI: 10.1016/j.dynatmoce.2018.10.002
关键词
ROMS; Western Tropical North Atlantic; Amazon River discharge; Ocean circulation; Mixed layer; Barrier layer; Oceanic heat content
资金
- Agencia Nacional do Petraleo (ANP) [PRH-47]
- Brazilian Research Network on Global Climate Change, FINEP/Rede CLIMA Grant [01.13.0353-00]
- Brazilian National Institute of Science and Technology for Tropical Marine Environments-INCT AmbTropic (CNPq/FAPESB) [565054/2010-4, 8936/2011]
- Brazilian Research Network on Global Climate Change - Rede CLIMA (FINEP) [01.13.0353-00]
- Project Modeling the light field in the waters of Equatorial Atlantic under the effects of the Amazon River discharge: implication to biogeochemical processes and primary production, MEC/MCTI/CAPES/CNPq/FAPs Grant [401326/2012-8]
- Project ProdPluma - Modelo Regional de Produtividade Primkiria da Pluma do Amazonas (CNPq) [460687/20140]
- Project Simulating the Amazon River Plume and its Impact using Climate Models [CAPES-TAMU 003440/2015-00]
This study focuses on analysing the potential impact of the Amazon and Pat a Rivers on the salinity, temperature and hydrodynamics of the Western Tropical North Atlantic (WTNA) region between 60.5 degrees-24 degrees W and 5 degrees S-16 degrees N. The Regional Ocean Model System (ROMS) was used to simulate ocean circulation with 0.25 degrees horizontal resolution and 32 vertical levels. Two numerical experiments were performed considering river discharge and river input. Temperature and salinity distributions obtained numerically were compared with Simple Ocean Data Assimilation (SODA) and in situ observations from the Prediction Research Moored Array in the Tropical Atlantic (PIRATA) buoys located at 38 degrees W8 degrees N and 38 degrees W12 degrees N. Surface currents were compared with Surface Currents from Diagnostic model (SCUD). Once we verified that model results agreed with observations, scenarios with and without river discharges were compared. The difference between both simulations in the Sea Surface Temperature distribution was smaller than 2 degrees C, whereas the Sea Surface Salinity (SSS) changed by approximately 8 psu in the plume area close to the coast from August to December and reaching SSS differences of approximately 4 psu in the region of the North Equatorial Counter Current (NECC). The surface current velocities are stronger in the experiment with river discharge, mainly in the NECC area from September to December and close to the coast in June to August. The results show that river discharges also cause a phase shift in the zonal currents, anticipating the retroflection of the North Brazil Current by two months and enhancing eastward NECC transport, which is in agreement with observations. The Mixed Layer Depth and Isothermal Layer Depth in the presence of river discharge is 20-50 m shallower over the entire extension of the Amazon plume compared with the situation without continental inflows. As a consequence, stronger Barrier Layers develop in the river plumes, reducing the Oceanic Heat Content in the WTNA.
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