A circulação oceânica de larga-escala na região oeste do Atlântico Sul com base no modelo de circulação Global OCCAM
A circulação oceânica de larga-escala na região oeste do Atlântico Sul com base no modelo de circulação Global OCCAM
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全球OCCAM
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
N. F. R. Deiró
中科院分区：
文献类型：
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作者：
Mauro Cirano;M. M. Mata;Edmo J. D. Campos;N. F. R. Deiró
OCCAM(海洋环流和气候高级模拟项目)是巴西海洋学界普遍使用的全球海洋环流模式之一。在大多数情况下，它与区域数值模拟研究有关，在这些研究中，它为更高分辨率的模式提供初始条件和边界条件。这项工作的目的是以水团的概念为基础，利用：i)来自NODC(国家海洋数据中心)的气候温度和盐度数据，以及ii)与水团有关的体积输送，并根据文献中提供的数值，每年比较OCCAM。选定的比较等级代表了南大西洋主要水团和相关洋流的核心，根据其体积输送情况进行了描述。结果表明，该模式能较真实地反映研究区主要洋流及相关水团的垂直结构。例如，在副热带环流的赤道部分，模式显示了南赤道气流分叉随深度增加而向南的纬向迁移。根据模式，对于热带水位，分叉发生在90s-15oS之间，南大西洋中央水平面移动到25oS，南极中间水平面移动到25oS-30oS之间。北大西洋深水是温盐环流的一部分，在模式中被表示为研究区域的净向南输送在15Sv到20Sv之间，与文献值一致。
The OCCAM (Ocean Circulation and Climate Advanced Modeling Project) is one of the global ocean circulation models which has been commonly used by the Brazilian oceanographic community. In most cases it is associated to regional numerical modeling studies, where it provides initial and boundary conditions for higher resolution models. The aim of this work, based on the concept of water masses, is to compare on an annual basis, the OCCAM with the use of: i) climatological temperature and salinity data from the NODC (National Oceanographic Data Center) and ii) volume transports associated with the water masses and based on values available in the literature. The selected levels of comparison were chosen to represent the core of the main water masses of the South Atlantic and the associated currents, described based on their volume transports. The main results indicate that the model is capable of representing realistically the vertical structure of the main currents and the associated water masses for the study region. In the equatorial portion of the subtropical gyre the model shows, for example, the southward zonal migration of the South Equatorial Current bifurcation with the increase of depth. According to the model and for the Tropical Water level, the bifurcation occurs between 9oS-15oS, moving to 25oS at the level of the South Atlantic Central Water and between 25oS-30oS at the level of the Antarctic Intermediate Water. The North Atlantic Deep Water, which is part of the thermohaline circulation, is represented in the model with a net southward transport between 15 Sv and 20 Sv for the region of study and is in agreement with the literature values.