جستجوی مقالات مرتبط با کلیدواژه "بارش دوره سرد" در نشریات گروه "جغرافیا"

Atmospheric rivers (ARs) are integrated and concentrated moisture paths that can influence precipitation in different countries. In this research, we aim to quantify the spatial distribution of ARs for 147 synoptic stations in Iran, their precipitation contributions, and their relation to total precipitation for six cold months of the year for 25 years (1995-2020). In this regard, the atmospheric rivers were identified based on the geographical location of each station and its precipitation characteristics. Then statistical analysis was used to determine the precipitation share and spatial distribution. As a result, on average, 8% of all studied times are associated with atmospheric rivers throughout the country. In addition, approximately 51% of the events identified have resulted in precipitation. In terms of location, most of the stations on the western slopes of Zagros and some coastal stations in the south have experienced all these events as rainy. This phenomenon is estimated to have provided between 6 and 69 percent of the country's total rainfall during six months of cold weather. There is a maximum share of this in the country's southern regions, and this share has decreased with the increase in latitude. Furthermore, the rise in AR precipitation is associated with an increase in total monthly rainfall in 84% of the studied stations. There is a spatial dissimilarity in the rain-affected by the phenomenon at different times.