introduction earth has ever been exposed to environmental hazards. the hazards are continually occurring in the world in the recent years. among them, atmospheric elements have created many human and financial losses in different regions. one of the hazards is dust events and in its severe case is dust storm. it happens more frequently in arid and semiarid regions in deserts and their surroundi...

daily precipitation data from aphrodite's resources with a spatial resolution of 0.25*0.25 degree for 57 years have been used to detect the trend of precipitation in afghanistan. first of all, monthly, seasonally, and yearly maps and regional mean time series calculated. according to the annual map, mean annual precipitation of the country is about 256 mm. there are two precipitation maxim...

Abstract The identification of hydro-meteorological trends is essential for analyzing climate change and river discharge at the watershed level. Ajora-Woybo in Ethiopia was studied long-term rainfall, temperature, annual, monthly, seasonal time scales. rainfall temperature data extend 1990 to 2020, whereas span from1990 2015. Pettitt Standard Normal Homogeneity Test (SNHT) tests were used deter...

the aim of this research is the study of trends in annual precipitation changes in some selected stations located in the sefid rood basin, applying the man-kendall non-parametric technique. the method is one of the most frequently used non-parametric techniques for trend analysis of precipitation on an annual scale. six synoptic stations located in the sefid rood basin were selected for the ana...

where it is assumed that the expected value of X(t) is zero. There is no commonly accepted precise definition for trend, but it is usually spoken of as a nonrandom (deterministic) smooth function representing long-term movement or systematic variations in a series (for example, Priestley (1981) refers to a trend as “. . . a tendency to increase (or decrease) steadily over time . . . [or to] flu...

The movement of people into and out the Zimbabwean borders has become a topical issue in every sector country. main devastating is when lot skilled professionals leave country to other countries search greener pastures without ploughing back home left origin with few or no personnel drive economy forward. Zimbabwe one developing that have suffered “brain drain” for past decades currently there ...

An upward trend in Ontario tornado frequency (about 1.6 tornadoes/decade with the statistically significant level at least at 95%) is identified using three independent approaches. The first method is the conventional linear regression method that had no disturbance to the original tornado time series. The second approach is to employ the Mann-Kendall test with consideration of removing a lag o...