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1 ACTA GEOGRAPHICA SLOVENICA GEOGRAFSKI ZBORNIK
2 ACTA GEOGRAPHICA SLOVENICA GEOGRAFSKI ZBORNIK Contents Ivan Čanjevac, Danijel OrešIć Changes in discharge regimes of rivers in Croatia 7 jaka PleČkO, nejc Bezak, Marjeta škapin rugelj, Mojca šraj Does it really rain more often on weekends than on weekdays: a case study for Slovenia 19 katja vintar Mally Regional Differences in Slovenia from the Viewpoint of Achieving Europe s Sustainable Development 31 Petra rus, janez nared, štefan BOjnec Forms, areas, and spatial characteristics of intermunicipal cooperation in the Ljubljana Urban Region 47 jadwiga gałka, anna Warych-juras Suburbanization and migration in Polish metropolitan areas during political transition 63 ewa skowronek, andrzej tucki, edward huijbens, Marta jóźwik What is the tourist landscape? Aspects and features of the concept 73 Irene BOllatI, emmanuel reynard, Davide cagnin, Manuela PelfInI The enhancement of cultural landscapes in mountain environments: An artificial channel history (Torrent-Neuf, Canton Valais, Switzerland) and the role of trees as natural archives of water flow changes 87 Piotr raźniak, sławomir DOrOckI, anna WInIarczyk-raźnIak Eastern European cities as command and control centers in a time of economic crisis 101 jani kozina Demographic characteristics of creative workers: under-activated development potentials in Slovenia? 111 jurij senegačnik Classification of regional and thematic approaches in school textbooks on the geography of Europe 123 ISSN
3 ACTA GEOGRAPHICA SLOVENICA ISSN: COBISS: UDC/UDK: 91 Geografski inštitut Antona Melika ZRC SAZU 2018 International editorial board/mednarodni uredniški odbor: Michael Bründl (Switzerland), Rok Ciglič (Slovenia), Matej Gabrovec (Slovenia), Peter Jordan (Austria), Drago Kladnik (Slovenia), Blaž Komac (Slovenia), Andrej Kranjc (Slovenia), Dénes Lóczy (Hungary), Simon McCharty (United Kingdom), Slobodan Marković (Serbia), Milan Orožen Adamič (Slovenija), Drago Perko (Slovenia), Marjan Ravbar (Slovenia), Aleš Smrekar (Slovenia), Annett Steinführer (Germany), Mimi Urbanc (Slovenia), Matija Zorn (Slovenia). Editor-in-Chief/glavni urednik: Blaž Komac; Executive editor/odgovorni urednik: Drago Perko; Chief editor for physical geography/glavni urednik za fizično geografijo: Matija Zorn; Chief editor for human geography/glavna urednica za humano geografijo: Mimi Urbanc; Chief editor for regional geography/glavni urednik za regionalno geografijo: Drago Kladnik; Chief editor for spatial planning/glavni urednik za regionaln o planiranje: Janez Nared; janez.nared@zrc-sazu.si Chief editor for urban geography/glavni urednik za urbano geografijo: David Bole; david.bole@zrc-sazu.si Chief editor for geographic information systems/glavni urednik za geografske informacijske sisteme: Rok Ciglič; rok.ciglic@zrc-sazu.si Chief editor for environmental protection/glavni urednik za varstvo okolja: Aleš Smrekar; ales.smrekar@zrc.sazu Editorial assistant/uredniški pomočnik: Matjaž Geršič; matjaz.gersic@zrc.sazu Published by/izdajatelj: Geografski inštitut Antona Melika ZRC SAZU Issued by/založnik: Založba ZRC Co-issued by/sozaložnik: Slovenska akademija znanosti in umetnosti Address/Naslov: Geografski inštitut Antona Melika ZRC SAZU, Gosposka ulica 13, SI 1000 Ljubljana, Slovenija The papers are available on-line/prispevki so dostopni na medmrežju: (ISSN: ) Ordering/naročanje: Založba ZRC Novi trg 2, p. p. 306, SI 1001 Ljubljana, Slovenija Phone/telefon: +386 (0) Fax/faks: +386 (0) /e-pošta: zalozba@zrc-sazu.si Annual subscription/letna naročnina: 20 for individuals/za posameznike, 28 for institutions/za ustanove. Single issue/cena posamezne številke: 12,50 for individuals/za posameznike, 16 for institutions/za ustanove. Cartography/kartografija: Geografski inštitut Antona Melika ZRC SAZU Translations/prevodi: DEKS, d. o. o. DTP/prelom: SYNCOMP, d. o. o. Printed by/tiskarna: Collegium Graphicum d. o. o. Print run/naklada: 400 copies/izvodov The journal is subsidized by the Slovenian Research Agency/revija izhaja s podporo Javne agencije za raziskovalno dejavnost Republike Slovenije. The journal is indexed also in/revija je vključena tudi v: SCIE Science citation index expanded, Scopus, JCR Journal Citation Report/Science Edition, ERIH PLUS, GEOBASE Journals, Current geographical publications, EBSCOhost, Geoscience e-journals, Georef, FRANCIS, SJR (SCImago Journal & Country Rank), OCLC WorldCat, and Google scholar, CrossRef. Front cover photography: Alpine environment has witnessed changes in discharge regimes that depend on the changes in precipitation and temperature regimes, land use and human influence (photograph: Matej Lipar). Fotografija na naslovnici: Pretočni režimi se v alpskih pokrajinah spreminjajo zaradi sprememb v padavinskem in temperaturnem režimu ter sprememb rabe zemljišč in človeških vplivov (fotografija: Matej Lipar).
4 Acta geographica Slovenica, 58-2, 2018, DOES IT REALLY RAIN MORE OFTEN ON WEEKENDS THAN ON WEEKDAYS? A CASE STUDY FOR SLOVENIA Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj NEJC BEZAK Climate conditions in Slovenia are changing as indicated by an increasing number of extreme events.
5 Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj, Does it really rain more often on weekends than on weekdays? DOI: UDC: (497.4) 504.5:502.3(497.4) COBISS: 1.01 Does it really rain more often on weekends than on weekdays? A case study for Slovenia ABSTRACT: The article presents the results of precipitation and aerosol (PM 10 ) data analyses in Slovenia. Analyses of rainfall data for some areas of Slovenia, such as the Ljubljana Basin, Zasavje, Šalek Valley, Celje Basin, and the coastal area, suggest that rain on the weekend is more frequent than on weekdays; nevertheless, these deviations are not statistically significant. A comparison of three separate decades showed that the pattern of weekly rainfall in the 21st century is different than that in the last period of the 20th century. The weekly cycle of PM 10 for the considered stations is quite similar to that of some of the more contaminated regions of the world. Furthermore, the connection between PM 10 and precipitation in most of the analyzed cases was statistically significant. KEY WORDS: precipitation, air pollution, weekly precipitation cycle, PM 10, statistical tests, Slovenia Ali res pogo ste je dežu je ob kon cih ted na kot med ted nom? Ana li za za Slo ve ni jo POVZETEK: Pris pe vek pri ka zu je ana li zo podat kov o pa da vi nah in del cih v zra ku (PM 10 ). Za neka te ra območja v Slo ve ni ji, kot so Ljub ljan ska kot li na, Zasav je, Šaleš ka doli na, Celj ska kot li na ter obal no območ je, je glede na ana li zi ra ne podat ke o pa da vi nah zna čil no, da več krat dežu je ob kon cih ted na kot med ted nom, ven - dar odsto pa nja niso sta ti stič no zna čil na. Pri mer ja va treh deset let nih obdo bij poka že, da je vzo rec teden ske raz po re di tve pada vin v 21. sto let ju dru ga čen kot v zad njem obdob ju 20. sto let ja. Teden ski cikel del cev PM 10 na obrav na va nih meril nih mestih je pre cej podo ben kot v ne ka te rih bolj one sna že nih regi jah sve ta. Poleg tega je pove za va med del ci PM 10 in koli či na mi pada vin v ve či ni ana li zi ra nih pri me rov sta ti stič no zna čil na. KLJUČNE BESEDE: pada vi ne, one sna že nje zra ka, teden ska raz po re di tev pada vin, PM 10, sta ti stič ni testi, Slo ve ni ja Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj Univerza v Ljubljani, Fakulteta za gradbeništvo in geodezijo plecko.jaka@gmail.com, nejc.bezak@fgg.uni-lj.si, Marjeta.Skapin-Rugelj@fgg.uni-lj.si, mojca.sraj@fgg.uni-lj.si The paper was submitted for publication on July 13 th, Ured niš tvo je pre je lo pris pe vek 13. ju li ja
6 1 Introduction We often have the feeling that it rains more frequently during weekends when the majority of people are not working. Since the beginning of the 20th century, the modern society has mostly adopted a 5-day work week cycle, and Saturday and Sunday are considered as non-working days (Arts 2008; Cerveny and Balling 1998). On these days sunny weather is usually preferred. The theory about the impact of human weekly cycle on the rainfall pattern has a logical explanation and was the topic of many studies (e.g., Gongetal. 2007; Shultz et al. 2007; Bell et al. 2008; DeLisi et al. 2011; Stjern 2011). The theory is related to anthropogenic influence that became more pronounced over the last century with daily commuting and development of heavy industry (Gong et al. 2007; Arts 2008; Bell et al. 2008; DeLisi et al. 2011; Stjern 2011). Higher air pollution may increase the amount of aerosols in the air, which influences the probability of rainfall occurrence (Bell et al. 2008). This means that the accumulation of small solid particles (PM 10 ) in the air, which may increase during the weekends, could trigger the changes in the atmospheric circulations that can result in non-uniform weekly rainfall patterns (Gong et al. 2007). Several studies dealing with this phenomenon have been carried out in recent years (Bell et al. 2008; DeLisi et al. 2011; Gong et al. 2007; Seibert et al. 2013; Shultz et al. 2007). In most of these studies, data on rainfall and PM 10 particles (particles with a diameter up to 10 µm) were used, and their conclusions depended on the location of the study and the selected data. Shultz et al. (2007) analyzed precipitation records from 219 stations in the United States with more than 40 years of measurements. They found that neither the amount nor the occurrence of rainfall differs statistically significantly from the uniform distribution as a function of the day of the week. Similar conclusions were drawn also by DeLisi et al. (2011) who analyzed data from seven stations along the east coast of the United States. Furthermore, Seibert et al. (2013) analyzed data from 376 stations in Switzerland and the main conclusion was that in some areas and on particular days of the week there was 10 to 20% more rainfall than on other days. Moreover, Gong et al. (2007) found that the significant weekly cycle of PM 10 and, consequently, rainfall is characteristic of urban regions in China, one of the most polluted areas in the world. In Slovenia, no study about weekly rainfall patterns has been conducted so far. However, some analyzes of seasonal characteristics of rainfall and discharge series were performed (Srebernič 2005; Bezak et al. 2015a, 2015b). The main aim of this study was to test if it really rains more often on weekends than on weekdays in Slovenia, and to find out which parts of Slovenia are those where rainfall distribution during the week is significantly non-uniform. Other aims of the study were as follows: (i) to analyze the weekly rainfall distribution in Slovenia and the differences among seasons, (ii) to compare weekly rainfall patterns among various 10-year periods ( ), and (iii) to analyze the concentration of PM 10 particles in the air and how this relates to the weekly rainfall pattern. 2 Data and methods Acta geographica Slovenica, 58-2, 2018 Daily rainfall data from 13 rainfall stations in Slovenia (Table 1) from 1980 onwards were used to analyze the weekly rainfall pattern (ARSO 2015). Any day with at least 0.1 mm of recorded rainfall was defined as a rainy day. The complete daily rainfall series was divided into 4 periods, i.e., , , , and , which were compared in the study. Furthermore, the differences in the seasonal pattern of the weekly rainfall distribution were analyzed. December, January, and February were assumed as winter months; March, April, and May as spring months; June, July, and August as summer months; and September, October, and November as autumn months. Moreover, PM 10 particles were analyzed in this study (the data were provided by the Slovenian Environment Agency; Table 2). Figure 1 shows the location of the considered stations where rainfall and PM 10 particles were recorded. Various parametric and nonparametric tests can be used to detect the changes in the time series (e.g., Kendall 1975; Maidment 1993; Esterby 1996; Rao and Hamed 2001; Kundzewicz and Robson 2004; Khaliq et al. 2009; Bezak et al. 2015a). The nonparametric χ 2 test (Haan 2002) was used in the study to test the hypothesis about a non-uniform rainfall pattern. The main advantage of the χ 2 test is that it can be applied to both continuous and discrete variables (Haan 2002) and is mostly used for hypothesis testing about distribution of samples (Turk 2012). In our study the following null hypothesis was used (H 0 ): rainfall distribution during the week is uniform, while the alternative hypothesis was (H A ): rainfall distribution 21
7 Kolpa Pesnica Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj, Does it really rain more often on weekends than on weekdays? Ščavnica Murska Sobota Mura Ledava Drava Meža Maribor Kredarica Savinja Velenje Dravinja Soča Idrijca Sora Sava Savinja Trbovlje Celje Šempas Vipava Ljubljanica Ljubljana Litija PivkaMirna Sava Krka Novo mesto Sotla Rainfal Rainfal and PM km J A D R A N S K O M O R J E Portorož Dragonja Kozina Reka Ilirska Bistrica Content by: Nejc Bezak Map by: Nejc Bezak Source: Geodetska uprava Republike Slovenije, Geografski inštitut Antona Melika ZRC SAZU Figure 1: Location of the selected stations. Table 1: Considered rainfall stations. Station name Station type Study period Ljubljana Bežigrad meteorological Kredarica meteorological Maribor letališče meteorological Murska Sobota Rakičan meteorological Celje Medlog meteorological Portorož letališče meteorological Novo mesto meteorological Velenje climatological Ilirska Bistrica climatological Kozina rainfall Šempas rainfall Litija Grbin rainfall Trbovlje rainfall Table 2: Stations with recorded PM 10 concentrations. Station name Station type Study period Ljubljana Urban Maribor center Urban (traffic) Murska Sobota Rakičan Rural Celje Urban Novo mesto Urban Koper Urban Nova Gorica Urban
8 during the week is non-uniform. Data about the number of days with rainfall were normalized against the total number of days. The χ 2 distribution with 6 degrees of freedom was used according to the number of days in the week (7). Furthermore, graphical presentations were used for analyzing the weekly rainfall distribution, where normalized data were shown together with the value of 3 standard deviations. The nonparametric Mann-Whitney test was selected for comparing the various periods. The null hypothesis (H 0 ) was: the tested samples are drawn from the same distribution, and the alternative hypothesis (H A ) was: the tested samples are not drawn from the same distribution. A significance level of 0.05 was selected. Moreover, critical value U krit was equal to 8 since both samples have 7 elements (H 0 can be rejected if test statistic U is smaller than U krit ). Pearson and Spearman correlation coefficients were used to analyze the connection between rainfall and PM 10 values. 3 Results and discussion 3.1 Weekly rainfall pattern Acta geographica Slovenica, 58-2, 2018 For 13 rainfall stations in Slovenia (Table 1), the number of rainy days on each day was determined for different periods. Table 3 shows an example of weekly rainfall distribution for station Ljubljana-Bežigrad. Days with the maximum number of rainy days in each period are shown in bold text. Furthermore, the calculated values were normalized and also presented graphically. Figure 2 shows weekly rainfall distribution for different seasons for the Ljubljana-Bežigrad station together with the values of 3 standard deviations. As shown in Figure 2, for the period Sunday was the day with the maximum number of rainy days for spring, summer, and autumn. Similar results were obtained for both the last period and the entire study period. Table 3: Weekly distribution of rainy days for different periods for the Ljubljana-Bežigrad station. Period Monday Tuesday Wednesday Thursday Friday Saturday Sunday Total The summary of the results of the basic statistical analyses (standard deviation) and the χ 2 test for all analyzed stations are given in Table 4. The days on the weekends with the maximum number of occurrences are indicated in bold text. Table 4 also shows the deviations of the results regarding the (2 and 3 times) standard deviation values. For 10 of 13 analyzed stations, there was at least 1 time period when the maximum number of rainy days was on weekends, particularly at Ljubljana-Bežigrad, Portorož, Velenje, and Trbolje stations. For the Ljubljana-Bežigrad station for 2 of 4 periods the weekends were found as the rainiest. In the first period ( ), the rain on Sundays was 9.7% more frequent than on other days. Sunday was also the rainiest day for the entire period ( ) and the number of rainy days was 5.3% more frequent. For the Portorož station, for 3 of 4 time periods the deviation exceeded the value of 2 standard deviations and, in the last study period, even the value of 3 standard deviations. The rainfall in the first, second and fourth study periods was 6.7%, 6.9%, and 11.2%, respectively, more frequent on Sundays than on other days of the week. Similar results were obtained for the entire study period where the percentage was 4.8. Sunday was the day with the maximum number of rainy days also for the Velenje station for the period where the deviation exceeded the value of 3 standard deviations. In this period, the rain on Sunday was 9.0% more frequent that on other days. For the Trbovlje station, the rain on Sunday was by 4.6% and 4.1% more frequent than that during other days for the periods and , respectively. These results are in accordance with other studies that concluded that non-uniform weekly rainfall distribution is more explicit for more polluted areas (Gong et al. 2007; Stjern 2011). The Šalek Valley and Zasavje are regarded as areas with relatively high pollution, Ljubljana Basin is the largest urban area in Slovenia, and the pollution at the Portorož station can be attributed to the influence of Trieste, Italy. 23
9 Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj, Does it really rain more often on weekends than on weekdays? Winter Spring Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun Summer Autumn Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun Ave 3*st. dev. Ave + 3*st. dev. Figure 2: Normalized values of rainy days for different seasons for the Ljubljana-Bežigrad meteorological station. These results are, to some extent, similar to those derived for Switzerland where in some cases the deviations were up to 20% (Seibert et al. 2013). Furthermore, the χ 2 test was applied to test whether the null hypothesis could be rejected with a significance level of The null hypothesis could not be rejected for any of the 13 analyzed stations and for any of the study periods. Moreover, the same test was applied to compare the distribution of rainy days on weekends and on weekdays (H 0 : on weekends and on weekdays the frequency of rainy days is the same; H A : on weekends and on weekdays the frequency of rainy days is not the same), but, for all the considered stations and periods, the null hypothesis could not be rejected with the selected significance level (Plečko 2015). 3.2 Changes in the rainfall pattern among different periods In the next step, we tested if the weekly rainfall pattern changed from 1980 to The Mann-Whitney test was applied and the following 10-year periods were tested: and ; and ; and and We compared the weekly rainfall pattern for the total period 24
10 Acta geographica Slovenica, 58-2, 2018 Table 4: Summary of the results for the weekly rainfall pattern for the analyzed stations in Slovenia and the calculated p-values of the χ 2 test. Station Period Day with max. Deviation Deviation p-value number of occurrences (2 times the standard deviation) (3 times the standard deviation) Ljubljana Sunday YES NO Thursday NO NO Tuesday YES NO Sunday YES NO Sunday NO NO 0.59 Maribor Sunday NO NO Tuesday NO NO Tuesday YES NO Tuesday YES NO Tuesday NO NO 0.29 Murska Sobota Sunday NO NO Tuesday NO NO Tuesday NO NO Tuesday YES NO Tuesday NO NO 0.68 Celje Saturday YES NO Thursday NO NO Monday YES NO Sunday, Monday YES NO Saturday NO NO 0.74 Novo mesto Tuesday YES YES Friday YES NO Tuesday YES NO Monday YES YES Tuesday NO NO 0.92 Kozina Tuesday NO NO Thursday YES NO Tuesday YES YES Sunday YES YES Tuesday NO NO 0.91 Šempas Tuesday YES NO Thursday YES YES Monday YES NO Sunday YES YES Sunday NO NO 0.89 Kredarica Monday YES NO Friday NO NO Thursday NO NO Sunday YES NO Tuesday NO NO 0.67 Portorož Sunday YES NO Sunday YES NO Monday YES NO Sunday YES YES Sunday NO NO 0.83 Velenje Sunday YES YES Monday YES NO Sunday, Monday NO NO 0.89 Ilirska Bistrica Friday YES NO Thursday YES NO Friday NO NO 0.93 Litija Thursday NO NO Thursday YES NO Thursday NO NO 0.95 Trbovlje Sunday NO NO Sunday NO NO
11 Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj, Does it really rain more often on weekends than on weekdays? and the individual seasons. Table 5 shows the results for the complete period, while Plečko (2015) presented the results for different seasons. It can be seen that for 7 stations the changes in the weekly rainfall pattern between and periods were statistically significant and for 4 stations the same conclusions were made for the and periods. The presented results indicate notable differences among the study periods, among which the last decade, i.e. the beginning of the 21 th century, stands out, which indicates changes in Slovenia's climate characteristics. Table 5: Summary of the Mann-Whitney test results used to detect changes between different time periods. Station Period Test results Test statistic U Ljubljana and H 0 could not be rejected 14 was rejected 5 was rejected 6 Maribor and H 0 could not be rejected 10 could not be rejected 16 could not be rejected 15,5 Murska Sobota and H 0 could not be rejected 19,5 could not be rejected 12 was rejected 3 Celje and H 0 could not be rejected 14,5 was rejected 7 could not be rejected 8 Novo mesto and H 0 could not be rejected 24 was rejected 6 was rejected 4,5 Kozina and H 0 could not be rejected 17,5 was rejected 7 could not be rejected 11,5 Šempas and H 0 was rejected 6 could not be rejected 15 could not be rejected 16 Kredarica and H 0 could not be rejected 18,5 was rejected 7 could not be rejected 12 Portorož and H 0 was rejected 0 could not be rejected 10 was rejected 0 Velenje and H 0 could not be rejected 17,5 Ilirska Bistrica and H 0 could not be rejected 14 Litija and H 0 could not be rejected Connection between PM 10 particles and rainfall In the last step of the study, the connection between the measured values of PM 10 particles in the air and rainfall was analyzed. Comparisons were made only for the time periods when PM 10 measurements are available (Table 2). Weekly distribution of PM 10 particles is shown in Table 6 and for the selected stations in Figure 3. It can be seen that Sunday was the day with the minimum PM 10 values for all stations. However, the day with the maximum PM 10 values was always in the second part of the week. A similar pattern in PM 10 particles distribution is also characteristic of much more polluted areas such as major urban regions in east China (Gong et al. 2007). Gong et al. (2007) noted that the characteristic pattern in PM 10 particles (i.e., gradual increase until the middle or the end of the working week, and minimum values on weekends) is accompanied by some other meteorological parameters such as wind speed in the troposphere, which 26
12 Acta geographica Slovenica, 58-2, 2018 is on average higher when PM 10 concentrations are smaller. Further, increased PM 10 concentrations could influence solar radiation, higher maximum temperatures, and the number of rainfall events (Gongetal. 2007). Table 6: Days with maximum and minimum PM 10 concentrations for the selected stations in Slovenia. Station Period Day with maximum PM 10 Day with minimum PM 10 Ljubljana-Bežigrad Friday Sunday Maribor-letališče Thursday Sunday Murska Sobota-Rakičan Thursday Sunday Celje-Medlog Wednesday Sunday Novo mesto Wednesday, Thursday, Friday Sunday Kozina Friday Sunday Šempas Friday Sunday Pearson (r) and Spearman (r) correlation coefficients were used to detect the relationship between the daily PM 10 values and the daily rainfall values in the selected seasons (Table 7). The calculated Pearson's PM10 concentrations [µg/m 3 ] Ljubljana Maribor Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun PM10 concentrations [µg/m 3 ] Celje Kozina Mon Tue Wed Thu Fri Sat Sun Mon Tue Wed Thu Fri Sat Sun Average daily values Average + st. dev. A verage st. dev. Figure 3: Weekly distribution of PM 10 concentrations at Ljubljana, Maribor, Celje, and Kozina stations. 27
13 Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj, Does it really rain more often on weekends than on weekdays? correlation coefficients indicate a negative and relatively weak linear correlation between the analyzed variables, however the calculated p-values demonstrate that the correlation is statistically significant (significance level 0.05) for all tested stations and all seasons with the exception of the Celje station where the relationship was not statistically significant for autumn, and the Novo mesto station where the relationship was not statistically significant for spring and autumn. Moreover, similar results were obtained with the use of the Spearman's correlation coefficient where the relationship was statistically significant (significance level 0.05) for all tested stations and all seasons. We can conclude that in Slovenia PM 10 directly and indirectly impact the rainfall occurrence and that rain events wash out large amounts of PM 10 particles from the air. However, hourly data would be needed to identify the relationship between PM 10 and rainfall more accurate, but such data on PM 10 are currently not available. Table 7: Calculated Pearson (r) and Spearman (r) correlation coefficient values between rainfall and PM 10 particles for various seasons and the corresponding p-values. Station Season r p-value r p-value Ljubljana winter 0.30 ~ ~0 spring 0.22 ~ ~0 summer 0.37 ~ ~0 autumn 0.35 ~ ~0 Maribor winter 0.22 ~ ~0 spring 0.25 ~ ~0 summer 0.32 ~ ~0 autumn 0.34 ~ ~0 Murska Sobota winter 0.26 ~ ~0 spring 0.19 ~ ~0 summer 0.25 ~ ~0 autumn 0.28 ~ ~0 Celje winter 0.26 ~ ~0 spring summer ~0 autumn Novo mesto winter 0.26 ~ ~0 spring summer ~0 autumn Kozina winter 0.22 ~ ~0 spring 0.24 ~ ~0 summer 0.24 ~ ~0 autumn 0.31 ~ ~0 Šempas winter 0.28 ~ ~0 spring 0.26 ~ ~0 summer 0.31 ~ ~0 autumn 0.33 ~ ~0 4 Conclusion The weekly rainfall pattern in Slovenia depends on the region and the analyzed time period as well as on the season and the pollution of individual regions. For the Trbovlje, Velenje, Portorož, and Ljubljana stations the differences between weekends and weekdays were larger than those for other analyzed stations. In some cases, the number of occurrences of rainfall exceeds the value of 3 standard deviations. However, using the χ 2 test, a statistically significant non-uniform rainfall pattern was found neither for the tested stations nor for seasons. The comparison between different time periods shows that the weekly rainfall pattern at the beginning of the 21 st century differs from that in the last decade of the 20 th century. A pos- 28
14 sible reason could be the decreasing air pollution values as a consequence of abandonment of heavy industry and wood heating, and the passing of adequate laws (Gosak 2014). However, the exceeding values of PM 10 are still relatively frequent (Gosak 2014). The weekly pattern of PM 10 particles in Slovenia is similar to that in some other more or less polluted areas in the world. Consequently, some level of connection between the rainfall values and PM 10 concentrations was detected for the tested stations, which was in most cases statistically significant. To sum up, the answer to the title question is as follows: For some areas in Slovenia such as the Ljubljana Basin, Celje Basin, coastal area, Zasavje and Šalek Valley, the possibility of rain on weekends is, indeed, larger than on weekdays, but the detected deviations are not statistically significant. ACKNOWLEDGEMENT: We would like to thank the Slovenian Environment Agency for data provision. 5 References Acta geographica Slovenica, 58-2, 2018 ARSO, 2015: Arhiv meritev. Internet: ( ). Arts, I. 2008: Structural time series analysis of meteorological data: In search of weekly cycles in Europe. Graduation thesis, Vrije Universiteit. Amsterdam. Bell, T. L., Rosenfeld, D., Kim, K. M., Yoo, J. M., Lee, M. I., Hahnenberger, M. 2008: Midweek increase in U.S. summer rain and storm heights suggests air pollution invigorates rainstorms. Journal of geophysical research 113-D2. DOI: Bezak, N., Brilly, M., Šraj, M. 2015a: Flood frequency analyses, statistical trends and seasonality analyses of discharge data: a case study of the Litija station on the Sava River. Journal of Flood Risk Management (in press). DOI: Bezak, N., Horvat, A., Šraj, M. 2015b: Analysis of flood events in Slovenian streams. Journal of Hydrology and Hydromechanics 63. DOI: Cerveny, R. S., Balling Jr., R. C. 1998: Weekly cycles of air pollutants, precipitation and tropical cyclones in the coastal NW Atlantic region. Nature 394. DOI: DeLisi, M. P., Cope, A. M., Franklin, J. K. 2001: Weekly precipitation cycles along the northeast corridor? Weather and forecasting 16. DOI: Esterby, S. R. 1996: Review of methods for the detection and estimation of trends with emphasis on water quality applications. Hydrological Processes 10. DOI: 10:2<127::aid-hyp354>3.0.co;2-8 Gong, D., Ho, C., Chen, D., Qian, Y., Choi, Y., Kim, J. 2007: Weekly cycle of aerosol-meteorology interaction over China. Journal of geophysical research 112. DOI: Gosak, N. 2014: Analiza onesnaženosti zraka z delci v Sloveniji. Magistrsko delo, Fakulteta za strojništvo Univerze v Mariboru. Maribor. Haan, C. T. 2002: Statistical methods in hydrology. Ames. Kendall, M. G. 1975: Multivariate analysis. London. Khaliq, M. N., Ouarda, T. B. M. J., Gachon, P., Sushama, L., St-Hilaire, A. 2009: Identification of hydrological trends in the presence of serial and cross correlations: A review of selected methods and their application to annual flow regimes of Canadian rivers. Journal of Hydrology 368. DOI: /j.jhydrol Kundzewicz, Z. W., Robson, A. 2004: Change detection in hydrological records a review of the methodology. Hydrological Sciences Journal DOI: Maidment, M. 1993: Handbook of Hydrology. New York. Plečko, J. 2015: Analiza tedenske razporeditve padavin za izbrane padavinske postaje v Sloveniji. Diplomsko delo, Fakulteta za gradbeništvo in geodezijo Univerze v Ljubljani. Ljubljana. Rao, A. R., Hamed, K. H. 2001: Flood frequency analysis. New York. Schultz, D., M., Mikkonen, S., Laaksonen, A., Richman, M. B. 2007: Weekly precipitation cycles? Lack of evidence from United States surface stations. Geophysical research letters DOI: /2007gl Seibert, J., Addor, N., Ewen, T. 2013: Does it really always rain on the weekend? Weekly precipitation cycles in Switzerland. Geophysical research abstracts
15 Jaka Plečko, Nejc Bezak, Marjeta Škapin Rugelj, Mojca Šraj, Does it really rain more often on weekends than on weekdays? Stjern, C. W. 2011: Weekly cycles in precipitation and other meteorological variables in a polluted region of Europe. Atmospheric Chemistry and Physics 11. DOI: acp Srebrnič, T. 2005: Časovna razporeditev padavin in pretokov v Sloveniji z analizo sezonskosti. Diplomsko delo, Fakulteta za gradbeništvo in geodezijo Univerze v Ljubljani. Ljubljana. Turk, G. 2012: Verjetnostni račun in statistika. Ljubljana. 30
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