Parashar D C, Kulshrestha U C, Jain M
Chemistry Division, National Physical Laboratory, New Delhi, India.
Environ Monit Assess. 2001 Jan;66(1):47-61. doi: 10.1023/a:1026424013890.
In India, rain water and atmospheric aerosols are observed to be alkaline in nature due to the influence of soil-derived particles which are rich in components like Ca and Mg. These components increase the neutralization potential of rain water and have a greater influence at rural site compared to urban site. However, if there are continuous rains, the concentration of crustal components becomes lower resulting in lower pH of rain water. Unlike the characteristics of rain water on continent, the pH of rain water has been observed to be acidic in all the events over the Indian Ocean during Pre-campaigns of Indian Ocean Experiment (INDOEX). The possible reason for acidic rains over Indian Ocean could be the anthropogenic contribution from continent transported by NE winds coming towards the ocean during this period.
在印度，由于富含钙和镁等成分的土壤衍生颗粒的影响，雨水和大气气溶胶在本质上呈碱性。这些成分增加了雨水的中和潜力，与城市地区相比，在农村地区的影响更大。然而，如果持续降雨，地壳成分的浓度会降低，导致雨水的pH值降低。与大陆上雨水的特征不同，在印度洋实验（INDOEX）的预实验期间，在印度洋上空的所有降雨事件中，雨水的pH值都被观测到呈酸性。印度洋上空酸雨的可能原因可能是在此期间从大陆由东北风输送到海洋的人为贡献。
