智利中部近海迈波河和拉佩尔河羽流的年际变化建模

IF 4.1 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
J. Salcedo-Castro, A. Olita, Freddy Saavedra, G. Saldías, Raúl C. Cruz-Gómez, Cristian D. De la Torre Martínez
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引用次数: 0

摘要

摘要。河流羽流对沿海环境有直接影响,影响沿海浮游生物和底栖生物群落,包括渔业资源。一般来说,河流羽流动力学的主要驱动力是河流流量和沿岸风应力,潮汐和地形起次要作用。在智利中部,流入东太平洋的河流在陆地上的路径相对较短,坡度高,雪雨混合。本研究旨在了解智利中部沿海/陆架地区Maipo河和Rapel河羽流的年际变化及其对当地海洋动力学的影响。采用水平分辨率为1 km,水平分辨率为20 sigma的沿海和区域海洋群落(CROCO)模式,模拟了2003-2011年期间的海洋动态。结果表明,烟柱的覆盖面积和沿海海洋盐度与河流流量有较强的相关性。主要的东北风控制了羽流向西北的方向。然而,冬季的东南风可以扭转羽流的方向,促进它们附着在海岸上并向南移动。研究结果还显示,在研究期间,智利中部地区的严重干旱与盐渍化趋势有关。这种盐化决定了当地动力的变化,这种变化在未来的气候变化情景中可能会更加频繁,因为智利中部地区雨水和河流流量严重不足。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling the interannual variability in Maipo and Rapel river plumes off central Chile
Abstract. River plumes have a direct influence on coastal environments, impacting coastal planktonic and benthic communities, including fishery resources. In general, the main drivers of river plume dynamics are the river discharge and the alongshore wind stress, whereas the tides and topography play a secondary role. In central Chile, rivers flowing into the eastern Pacific have a relatively short path on land, with a high slope and a mixed snow–rain regime. This study aims to understand the interannual variability in the plumes of the Maipo and Rapel rivers in the coastal/shelf area off central Chile and their influence on local ocean dynamics. We used the Coastal and Regional Ocean Community (CROCO) model, with 1 km horizontal resolution and 20 sigma levels, to simulate the ocean dynamics for the period 2003–2011. The results show that the plume's area coverage and coastal ocean salinity are strongly correlated with the river discharges. The predominant northeastward winds control the plumes' orientation toward the northwest. However, episodes of southeastward winds in winter can reverse the plumes' direction, promoting their attachment to the coast and southward transport. Results also show a salification trend linked to the severe droughts hitting central Chile during the studied period. This salification determines a change in local dynamics which could be more frequent in future scenarios of climate change with a significant lack of rain and river discharges along central Chile.
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来源期刊
Ocean Science
Ocean Science 地学-海洋学
CiteScore
5.90
自引率
6.20%
发文量
78
审稿时长
6-12 weeks
期刊介绍: Ocean Science (OS) is a not-for-profit international open-access scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on all aspects of ocean science: experimental, theoretical, and laboratory. The primary objective is to publish a very high-quality scientific journal with free Internet-based access for researchers and other interested people throughout the world. Electronic submission of articles is used to keep publication costs to a minimum. The costs will be covered by a moderate per-page charge paid by the authors. The peer-review process also makes use of the Internet. It includes an 8-week online discussion period with the original submitted manuscript and all comments. If accepted, the final revised paper will be published online. Ocean Science covers the following fields: ocean physics (i.e. ocean structure, circulation, tides, and internal waves); ocean chemistry; biological oceanography; air–sea interactions; ocean models – physical, chemical, biological, and biochemical; coastal and shelf edge processes; paleooceanography.
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