The assessment of aridity in Leskovac basin, Serbia (1981-2010)

Abstract

In the paper, the aridity is defined on the basis of four climate indices: De Martonne's index of aridity, Lang's Rain Factor and Gračanin's Rain factor for the vegetation period and hydrothermal coefficient of Seljaninov. While the annual value of the drought index (I DM) shows humid characteristics, the monthly values show the variability of the conditions. The summer months (July and August) are classified as semi-arid months, while the winter months (December-February) are extremely humid. The spatial distribution of the isoarids indicates that the northern part of the basin has the characteristics of a semiarid climate, while the southeastern parts are more humid. The analysis of mean annual values of the drought index indicates in semiarid conditions (1990 and 2000), but also the humid conditions (2005 and 2009). A positive linear trend indicates that there is a tendency towards humid conditions. The significance test confirms the existence of a statistically significant trend. During the vegetation period, semi-arid conditions are present (July-August). April is slightly humid, and October is moderately arid. The Lang's Rain Factor (KFg) characterizes basin climate as semiarid, while the Gračanin rain factor for the vegetation period (KFm) indicates a moisture deficit in the summer months. Hydrothermal coefficient Seljaninova (HTC) indicates a lack of moisture in July and August. Vegetation period is characterized as insufficiently humid. Irrigation is one of the most important measures for solving drought problems, since the yield varies from year to year.

Biomass and Protein Yields of Field Peas and Oats Intercrop Affected by Sowing Norms and Nitrogen Fertilizer at Two Different Stages of Growth

“…Gračanin rain factor (GRF) [28] represents a relationship between the sum of monthly precipitations and the mean monthly temperatures for each month. The formula is calculated with GRF = SMP/AMT; SMP-the sum of monthly precipitations; AMT-average monthly temperatures.…”

Analysis of air temperature trends: City of Podgorica (Montenegro)

“…A similar trend continued in the next century, so the four warmest years since instrumental measurements were recorded in the second decade of the 21 st century -2015century - , 2016century - , 2017century - and 2018century - (WMO, 2019. Previous research into climate change in the wider region and in Southeast Europe has addressed similar issues (Jovanović et al, 2002;Unkašević & Tošić, 2013;Tosić et al, 2016;Trbić et al, 2017;Gavrilov et al, 2015;Gavrilov et al, 2016;Gavrilov et al, 2018;Ivanović et al, 2016;Popov et al, 2017; * Corresponding author: nikola.bacevic@pr.ac.rs al., 2018;Vukoičić et al, 2018;Papić et al, 2019) and aridity as an indicator of climate change (Hrnjak et al, 2014;Radaković et al, 2017;Milentijević et al, 2018). A statistically significant upward trend in the average annual air temperature was also observed in the urban area (Savić et al, 2013;Bačević et al, 2018).…”

Climate Change Projections of Aridity Conditions in the Iberian Peninsula

“…Many previous studies have used aridity indices in different regions, as they measure the degree to which a region's climate lacks effective and life-promoting moisture [7]. Spatial and temporal variations of several indices were analyzed for Bahrain [8], Bangladesh [9], Turkey [10][11][12][13], Greece [7], Romania [14][15][16][17], Ethiopia [18,19], Iran [20][21][22], Pakistan [23], IP [24][25][26], Iraq [27,28], Extremadura in southwestern Spain [29], Serbia [30][31][32], India [33,34], the Middle East and North Africa [35], Calabria in Southern Italy [36], and southeastern Europe [37]. However, these studies were conducted over historical periods and do not project potential shifts under future climate change scenarios.…”