Study of probabilistic modeling of stratospheric ozone fluctuations over Pakistan and China regions

• Stratospheric ozone has an essential role in terrestrial life particularly in climatic variability and protects earth biosphere from the harmful UV radiations.
• Variation of ozone pattern, and its impact on surface of earth, is an important climatic problem facing society today.
• Trend analysis contributes the economic development and hydrological planning.
• Investigates and comparison the variation over Pakistan and China stratospheric ozone.
• China ozone thickness is more spread as compared to Pakistan.

Stratospheric ozone has an essential role in terrestrial life particularly in climatic variability and protects earth biosphere from the harmful UV radiations. The present study investigates the variation of the stratospheric ozone layer over Pakistan and China for the period from 1984 to 2010. For this purpose a probability distribution approach is applied. In this regard the adequacy of Normal, Gamma and Log-Normal distributions are tested with the help of Kolmogorov–Smirnov D-test. It is found that most of the months, Pakistan region follow Log-normal while China region exhibits Normal probaility distribution. In addition, mean and standard deviations of monthly ozone are also calculated. It gives more eminence to stratospheric ozone variability behavior. Furthermore, trend models are used to compute the ozone variations for the above mentioned regions.Most of the months show increasing trend except the decreasing trend in Februery and May for Pakistan and Januray and September for China. Trend analysis contributes the economic development and hydrological planning. This research is a part of a larger research project which compares the climatic variability of Pakistan with the climatic variability of neighboring countries and the other countries of the region which are considered important in this regard. Such comparisons will appear in other communications.