Spatial pattern of temperature and precipitation trends in Guilan Province
Subject Areas : ClimatologyLeila Haqparast Mozhdehi 1 , bahman ramzani gourabi 2 , Atosa Bigdeli 3 , Yosof Zinolabedini 4
1 - PhD student, Department of Geography, Rasht Branch, Islamic Azad University, Rasht, Iran
2 - Geography Department, Faculty of Humanities, Azad University of Rasht, Gilan, Iran
3 - Assistant Professor, Department of Geography, Rasht Branch, Islamic Azad University, Rasht, Iran
4 - Associate Professor, Department of Geography, Rasht Branch, Islamic Azad University, Rasht, Iran
Keywords: Temperature and precipitation, trend, spatial pattern, cluster, Guilan province,
Abstract :
Spatial and temporal changes in temperature and precipitation are influenced by local and global conditions and affect ecological life and sustainable management of water resources. In this study, data were first received from the European Centre for Medium-Range Weather Forecasts (ECMWF) with a spatial resolution of 〖0.25〗^°×〖0.25〗^° for 44 years (1980 to 2023). Then, the trend of temperature and precipitation changes was determined using the Mann-Kendall trend test and the local Moran I statistic (ALMI) was used to identify the type of their spatial pattern. The results of this test on the average monthly temperature showed that there is a positive increasing trend in the months of January, February, March, May, June, July, August, September, October and December at a significance level of α=0.05. Also, precipitation in May, June and August follows a negative trend. In this regard, the spatial pattern of temperature and precipitation showed that the high-high (HH) and low-low (LL) cluster patterns in trending months have formed as separate nuclei in different parts of the province, from the plain to the mountains and from east to west. As a result, non-random behavior dominates the spatial distribution pattern of temperature and precipitation in these months across Guilan province.
