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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Application of three-dimensional triple nested mesoscale model for assessing the transport and boundary layer variability over the Indian Ocean during INDOEX
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Application of three-dimensional triple nested mesoscale model for assessing the transport and boundary layer variability over the Indian Ocean during INDOEX

机译：三维三层嵌套中尺度模型在INDOEX期间评估印度洋上的输运和边界层变化的应用

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摘要

A three-dimensional triple nested domain version of MM5 was applied for INDOEX region (40.12 degreesN-32.04 degreesS; 32.10 degreesE-117.90 degreesE) to study the regional flow patterns and associated transport using backward and forward trajectories. The model was integrated for 48h period starting 00 UTC 5 March 1999, From the simulations a mapping of the temporal and spatial variations in the marine boundary layer (MBL) heights were obtained. The boundary layer heights were verified using actual ship-based sounding from RV Ronald H, Brown and a good agreement was found. The model simulated significant variability in the MBL heights both spatially and temporally. During the daytime, the continental boundary layer was similar to 1500 m deep while over the ocean, the MBL was shallow (similar to 300 m) near the coast, and it increased steadily towards the ITCZ where MBL heights of similar to 1000 m were encountered. During night there was a reversal with the continental boundary layer heights averaging less than 500 m while over the ocean, particularly over the ITCZ, the MBL heights were similar to 1000 to 1500 m, This variability in the MBL heights significantly affected the transport pattern over the INDOEX region. Both the backward and forward trajectories showed distinct characteristics depending on the source region (eastern or western coastal landmass, equator, or near ITCZ), Near the coast, there was an evidence for localized circulation in which the air parcels were trapped along the coast. For the open oceans (both near the ITCZ as well as equator) the air parcel trajectories continued over a significant distance. Results suggest that MM5 can be successfully applied for diagnostic studies related to INDOEX, and that the boundary layer heights and the variations in the air parcel transport need to be considered for interpreting the surface measurements. [References: 8]
机译：将MM5的三维三重嵌套域版本应用于INDOEX区域（北纬40.12度至32.04度;东经32.10度至117.90度），以使用后向和前向轨迹研究区域流型和相关的传输。该模型在1999年3月5日UTC时间开始的48小时内进行了集成，从模拟中获得了海洋边界层（MBL）高度的时空变化的映射。边界层的高度使用RV Ronald H，Brown的实际舰船测深仪进行了验证，并找到了很好的协议。该模型模拟了MBL高度在空间和时间上的显着变化。在白天，大陆边界层深约1500 m，而在海洋上空，MBL在海岸附近很浅（约300 m），并且向着ITCZ稳步增加，在ITCZ遇到MBL高度约1000 m 。在夜间，大陆边界层高度平均下降了不到500 m，而在海洋上，特别是在ITCZ上，MBL高度类似于1000到1500m。MBL高度的这种变化显着影响了整个运输模式。 INDOEX区域。后退和前进轨迹都显示出不同的特征，具体取决于源区域（东部或西部沿海陆地，赤道或ITCZ附近）。在海岸附近，有证据表明局部循环是空气包裹在海岸中。对于大洋（在ITCZ和赤道附近），航空包裹的轨迹在相当长的一段距离上持续。结果表明，MM5可以成功地用于与INDOEX相关的诊断研究，并且在解释表面测量结果时需要考虑边界层高度和空运的变化。 [参考：8]

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