在ARMEX期间阿拉伯海上空离子浓度和电导率的测量
Measurements of the ion concentrations and conductivity over the Arabian Sea during the ARMEX
摘要：
在2002年和2003年的季风和前季风季节期间，在阿拉伯海季风实验（ARMEX）期间，ORV Sagarkanya的四次巡航中对阿拉伯海上空的小、中、大离子浓度和两极的大气导电度进行了测量。总的季节平均值，以及极电导率是高得多，在季风比前季风季节。然而，令人惊讶的是，小离子的浓度较少，大离子和中等离子的浓度在季风期间比前季风季节更多。在前季风季节观测到的日变化表明，夜间的小离子浓度约一个数量级高于白天的值。相反，白天浓度的中型和大型离子远高于其夜间值。在季风季节没有观察到这样的离子浓度的日变化。还研究了不同类型的离子浓度的变化，随着距离海岸线在不同的季节和离子浓度的变化与各种类型的降水发生在ORV Sagarkanya。用离子-气溶胶附着过程来解释季风前的观测结果是足够的。然而，假设阿拉伯海上每秒10至20米的强烈西南风表面风导致波浪破碎，从而导致气泡破碎过程，从而产生高度带电的大离子，以解释季风季节的观测结果。
英文摘要：
Measurements of the small-, intermediate-, and large-ion concentrations and the atmospheric electric conductivity of both polarities have been made over the Arabian Sea on four cruises of ORV Sagarkanya during the Arabian Sea Monsoon Experiment (ARMEX)during the monsoon and pre-monsoon seasons of 2002 and 2003. Seasonally averaged values of the total as well as polar conductivity are much higher during the monsoon than pre-monsoon season. Surprisingly, however, the concentration of small ions are less and those of large and intermediate ions are more during the monsoon than pre-monsoon season. The diurnal variations observed during the pre-monsoon season show that the nighttime small ion concentrations are about an order of magnitude higher than their daytime values. On the contrary, the daytime concentrations of the intermediate and large ions are much higher than those of their nighttime values. No such diurnal variations in ion concentrations are observed in monsoon season. Also examined are the variations in ion concentrations of different categories with distance from the coastline in different seasons and the ion-concentration changes associated with the precipitation of various types that occurred over ORV Sagarkanya. It is sufficient to invoke the ion-aerosol attachment process to explain our pre-monsoon observations. However, the generation of highly charged large ions by the bubble-breaking process caused by the wave breaking due to strong southwesterly surface winds ten to twenty meter per second over the Arabian Sea is postulated to explain the monsoon season observations.
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