An oceanographic nowcast/forecast system for the Red Sea
An oceanographic nowcast/forecast system for the Red Sea
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DOI：
10.1029/97jc01919
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发表时间：
1997-11-15
影响因子：
3.6
通讯作者：
Kantha, LH
中科院分区：
文献类型：
--
作者：
Clifford, M;Horton, C;Kantha, LH
我们描述了应用程序的临近预报/预报系统的三维电流，温度和盐度的红海。该建模系统是围绕一个高分辨率（6 × 7公里）的连续方程数值环流模式与完整的热力学和嵌入式湍流封闭子模型。它与包含气象预报和遥感及现场温度和盐度数据的近实时数据库相连接。每天的温度和盐度数据摄取到模型中使用轻推的客观分析技术。由于红海是一个相对狭窄的盆地，周围有典型的高和复杂的地形，单层大气边界层子模式已被用来增加有效分辨率的原始40公里分辨率的气象场，考虑到地形转向的低层风。为了验证建模系统，两个非常完整的水文调查的红海进行，他们的结果进行了说明。调查和模拟系统的即时预报都表明，红海的环流模式是多变的，往往由一系列涡旋或亚涡旋组成，主要是反气旋。在第一次调查之前，风倾向于沿着轴，而在第二次调查之前，风倾向于交叉轴。当风是交叉轴时，红海环流更像是漩涡。通过强迫建模系统与地形和无地形转向风，我们能够建立复杂的涡结构是风场的响应，风场可以是高度结构化的，涡度丰富，因为与高和可变的相邻地形的相互作用，当风更多的沿着轴，有较少的相互作用与相邻地形，因此，有较少的涡在红海。
We describe the application of a nowcast/forecast system for three-dimensional currents, temperature, and salinity to the Red Sea. The modeling system is constructed around a high-resolution (6 x 7 km) primitive-equation numerical circulation model with complete thermodynamics and an imbedded turbulence closure submodel. It is coupled to near-real-time databases containing meteorological forecasts and remotely sensed and in situ temperature and salinity data. The temperature and salinity data are ingested into the model daily using a nudged objective analysis technique. Because the Red Sea is a relatively narrow basin bounded by typically high and complex orography, a single-layer atmospheric boundary layer submodel has been used to increase the effective resolution of the original 40-km resolution meteorological fields by taking into account orographic steering of the low-level winds. In order to validate the modeling system, two very complete hydrographic surveys of the Red Sea were undertaken, and their results are described. Both the surveys and the modeling system nowcasts demonstrate that the circulation pattern of the Red Sea is variable and often composed of a series of eddies or subgyres, mainly anticyclones. Immediately before one survey, the winds tended to be along axis, while just before the second, they tended to be cross axis. The Red Sea circulation was much more eddy-like when the winds were cross-axis. By forcing the modeling system with and without orographically steered winds we were able to establish that the complex eddy structure is a response to a wind field which can be highly structured and vorticity rich because of interaction with the high and variable adjacent orography, When the winds are more along axis, there is less interaction with the adjacent orography, and consequently, there are fewer eddies im the Red Sea.