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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Numerical study of the role of land-air-sea interactions for the northeasterly monsoon circulations over Indian Ocean during INDOEX
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Numerical study of the role of land-air-sea interactions for the northeasterly monsoon circulations over Indian Ocean during INDOEX

机译：INDOEX期间海陆气相互作用对印度洋东北季风环流的作用的数值研究

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One of the principal objectives of the Indian Ocean Experiment (INDOEX) was to study the aerosol transport from the Indian subcontinent to the pristine oceanic environment. The underlying hypothesis for INDOEX is that, during the northeasterly monsoon, the intruding aerosols and other anthropogenic pollutants can entrain into the Inter Tropical Convergence Zone (ITCZ) and the Equatorial Indian Ocean and finally into the clouds, The altered clouds influence the radiative transfer processes at the regional and possibly global scale. The driving mechanism for the regional transport was the boundary layer circulation. In this study, it was hypothesized that the circulation pattern, which affects the regional transport, was strongly influenced by the land-air-sea interactions. To test this, a zonally symmetric version of a primitive equation numerical weather prediction model, called the Advanced Regional Prediction System (ARPS), was used. A number of numerical experiments were performed for a 2-D domain ranging from 14 degreesN to 16 degreesS centered over 76 degreesE, In the experiments, the influence of land-sea interaction (differential heating), topography (Western Chats), and the thermal gradients (SST and land surface temperature) on the coastal circulations over Equatorial Indian Ocean were studied. Results indicated a strong land-air-sea interaction and feedback teleconnection between the local and large scale features. Interestingly, the model generated land influence to the order of 1000 km offshore in the simulation domain, consistent with different observations. Results suggest that the oceanic environment in the northeast monsoon over Arabian Sea and the Indian Ocean can display significant diurnal variability and heterogeneity due to topography and surface temperature gradients, and that the local features have interactive feedback on the large scale circulations and transport. [References: 15]
机译：印度洋实验（INDOEX）的主要目标之一是研究从印度次大陆到原始海洋环境的气溶胶传输。 INDOEX的基本假设是，在东北季风期间，侵入的气溶胶和其他人为污染物可以夹带进入热带辐合带（ITCZ）和赤道印度洋，最后进入云层，改变后的云层会影响辐射传输过程在区域甚至全球范围内。区域运输的驱动机制是边界层环流。在这项研究中，假设影响陆地运输的环流模式受到陆地-空气-海洋相互作用的强烈影响。为了对此进行测试，使用了称为高级区域预报系统（ARPS）的原始方程式数值天气预报模型的区域对称形式。在以76度E为中心的14DN到16°S范围内的2-D区域进行了许多数值实验。在实验中，陆地-海洋相互作用（差异加热），地形（Western Chats）和热研究了赤道​​印度洋沿岸环流的梯度（海表温度和地表温度）。结果表明，本地和大规模特征之间强烈的海陆空互动和反馈遥相关。有趣的是，该模型在模拟域中产生了对海上1000公里数量级的陆地影响，这与不同的观测结果一致。结果表明，由于地形和地表温度梯度的影响，阿拉伯季风东北风和印度洋上空的海洋环境可能表现出明显的昼夜变化和非均质性，而且局部特征对大规模的环流和运输具有交互反馈。 [参考：15]

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