Abstract
This contribution provides the basics of the climatology of the Polish Tatra Mountains in a nutshell, with particular reference to intense precipitation and its relation to atmospheric circulation. Variability of various precipitation characteristics, including selected indices of intense precipitation in Zakopane and at Kasprowy Wierch, is illustrated in this paper. None of the trends in these characteristics and indices calculated for the entire time interval exhibit a statistical significance, but short-time fluctuations are evident. The occurrence of intense precipitation in the Tatra Mountains is strongly related to three circulation types. These situations (Nc, NEc, Bc) are associated with cyclones following track Vb after van Bebber. In addition to changing frequencies of circulation, this study also reveals an increase in the frequency of the circulation types associated with extreme precipitation.
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1 Introduction
The Polish-Swiss research project FLORIST (Flood risk on the northern foothills of the Tatra Mountains; Kundzewicz et al. 2013) deals with the evaluation of flood hazard and risk on the northern foothills of the Tatra Mountains, where considerable potential exists for flood generation. One of the competence clusters on which the project is focused is observation-based climatology of climatic extremes (Heino et al. 1999). One of the topical areas of the FLORIST project is the analysis of change in intense precipitation and “wet” weather circulation patterns occurring in the study area. The project aims at creating a comprehensive information database on past torrential disasters and floods in the northern foothills of the Tatra Mountains and their triggers as well as on change detection in intense precipitation and in circulation patterns. The aim of this paper is to recognize long-term changes in flood precipitation and its linkage to atmospheric circulation at the stations located in the Polish Tatra Mountains.
This contribution discusses the long-term changes in the warm half-year (May–October) and summer season precipitation as causing flood events and in selected high precipitation indices (maximum daily precipitation, maximum 3- and 5-day precipitation totals, number of days with precipitation ≥30 and ≥50 mm). The relations between the occurrence of high daily precipitation totals (≥30 and ≥50 mm) and atmospheric circulation are documented, and the weather patterns favouring the occurrence of the very highest precipitation (≥100 mm 24 h−1) are analysed. The climate conditions of the Tatra Mountains undergo rapid changes with altitude. Interconnection between this specific climate and orography is conductive to generate floods which affect wide areas of Poland. The basics of Tatra Mountains climate and the statistics of high precipitation, presented in the following as a background for further investigations, were drawn from material published in the past (e.g. Hess 1965; Konček 1974; Niedźwiedź 1992; Cebulak and Niedźwiedź 1998; Niedźwiedź 2003a; Ustrnul and Czekierda 2009). In addition, we analyse meteorological data from two synoptic stations of the Institute of Meteorology and Water Management–State Research Institute (IMGW–PIB) with the longest series of daily precipitation totals. Part of data for the period 2000–2012 has been obtained from the SYNOP messages database OGIMET (Valor 2013).
2 The basics of the Tatra Mountains climate
The topography and climate of Poland play an important role in the spatial and temporal distribution of flood hazards. The Tatra Mountains (Tatry in Polish and Slovak) are the highest range of the massive arc of the Carpathian Mountains, spreading over a distance of about 1,300 km and passing through several Central and Eastern European countries. The Polish Tatra Mountains, located in the southernmost part of the country (Fig. 1), record the highest precipitation totals in Poland, due to orographic effects, and largely contribute to flood generation, thereby affecting large areas of the Polish foothills and lowlands to the north.
The Tatra Mountains are an important barrier to the movement of air masses. Air temperature is the most important climatic element, which strongly depends on elevation and exerts a considerable influence upon the vegetation and landscape (Hess 1965; Niedźwiedź 1992). For example, on the northern slopes of the Tatra Mountains, mean annual temperature ranges from about 6 °C at elevations of 600–650 m at the bottom of the Nowy Targ Basin to −4 °C on the highest peaks of the Tatra ridge (Tables 1 and 2). Hess (1965) proposed to divide the region in six distinct vertical climatic belts of 2 K width, based on mean annual temperature. The upper treeline (1,550 m above sea level (a.s.l.)) is consistent with the annual isotherm of 2 °C. The subalpine belt with Pinus mugo covers elevations from 1,550 to 1,850 m, where the mean annual temperature drops to 0 °C. A belt of alpine meadows extends from 1,850 to 2,200 m a.s.l. Above 2,200 m (semi-nival belt), bare rock and lichens predominate, and snow precipitation is more frequent than rainfall. Here, the duration of snow cover extends 230 days per year. The altitudinal range determining the vertical climate and vegetation zones is distinctly different between the northern and southern sides of the Tatra Mountains. Borders of particular vertical climatic zones are consistently higher, by 50–200 m, on the southern side of Tatra Mountains.
The greatest annual temperature range (ATR), defined as the difference between the mean temperatures of the warmest and coolest months, is 21.5 K in Nowy Targ Basin and decreases to <16 K on the mountain peaks above 2,000 m (Table 2). Absolute temperatures on the northern foothills of the Tatra Mountains range from less than −40 °C in 1928/1929, the coldest winter of the twentieth century (Poronin −40.4 °C on 10 February 1929), to 35 °C in Nowy Targ in summer (Table 2). In Nowy Targ, the largest difference between absolute minimum (−36 °C) and maximum (35 °C) temperatures ever recorded is 71 K. On the summit of Lomnicky štít (2,635 m), the difference between absolute minimum (−30.5 °C) and maximum (+17.8 °C) temperatures is 48.3 K, and temperatures may fall below 0 °C during 286 days per year. The longest period with uninterrupted negative temperatures was 198 days (i.e. ice days with T max < 0 °C), and freeze-thaw conditions (with T max > 0 °C and T min ≤ 0 °C) have been recorded on 88 days (Niedźwiedź 1992). At altitudes close to 2,000 m, the average number of ice days has decreased from 151 for the period 1951–1980 to 141 days for the period 1981–2012. During the last 62 years, it varied from 107 days in 1989 to 177 days in 1952.
The number of days with snow cover in the Tatra Mountains increases with altitude at a rate of 9 days 100 m−1 and varies from less than 120 days at the mountain base to about 220–290 days on the highest peaks (Hess 1965). On the Kasprowy Wierch summit, snow cover lasts 221 days on average (1951–2012) and varied from 184 days in 1984 to 254 days in 1974. Between 2001 and 2012, the average duration of snow cover was 7 days shorter as compared to the entire period. In Zakopane, the average duration of snow cover was 126 days between 1914/1915 and 1998/1999. The range of number of days with snow cover extended from 84 days in winter 1924/1925 to 170 days in winter 1931/1932. Average maximum snow depths amount to 63 cm. During two winters, 1924/1925 and 1960/1961, the maximum snow cover thickness did not exceed 25 cm, and during the snowiest season (1944/1945), it reached 123 cm (Falarz 2002). Near the upper timberline at Hala Gąsienicowa (1,520 m), snowpack had a thickness of 237 cm during that extreme winter. Snow depth on the summit of Kasprowy Wierch has been reported to amount to 355 cm (15 April 1995). Recently, such a deep snow cover (335 cm) was measured there on 21 March 2009, whereas the maximum depth did not exceed 92 cm in 1984 and 93 cm in 2011. The snow water equivalent may reach up to 581 mm at Kasprowy Wierch and 456 mm at Hala Gąsienicowa.
A statistically significant decreasing trend of snow cover duration (−8 days 10 years−1) and maximum snow cover depth (−9 cm 10 years−1) has been detected in Zakopane for the period 1961–1990 (Falarz 2002). No such trend can, however, be found at the scale of the twentieth century (period 1915–1999). At Kasprowy Wierch, where available records span the period 1954–1998, the highest stable condition of winter snow cover occurred in 1954–1960, 1970–1980 and 1990–1998 (Falarz 2013).
Winds are often strong in the Tatra Mountains. Mean annual wind speed at Kasprowy Wierch is about 6–7 m s−1, and the number of days with strong wind (≥10 m s−1) exceeds 190 (Niedźwiedź 1992). Winds are predominantly southerly on the northern side and westerly at the base of the Tatra Mountains (Orawa–Nowy Targ Basin). Strong, warm and dry Foehn-type winds (Polish term: halny), occurring typically between October and May, can cause extensive damage and may considerably accelerate snow pack melting. Foehn winds may reach speeds of >60 m s−1 on the mountain slopes and 25–30 m s−1 in the valleys. The largest damage on the northern side of the Tatra Mountains was caused by foehn wind on 6 May 1968 with maximum gusts estimated to about 80 m s−1 in Kasprowy Wierch and 40 m s−1 in Zakopane (Niedźwiedź 1992). On 19 November 2004, extremely strong westerly winds occurred between the Low and High Tatras in Slovakia with gusts exceeding 45 m s−1 (tunnel effect), causing severe wind throw of trees. The damaged forest area was in the order of 14,000 ha.
3 Statistics of high precipitation
The precipitation totals recorded on the northern slopes of the Tatra Mountains are the highest in Poland. Mean annual precipitation at Kasprowy Wierch (1,991 m a.s.l.) amounted to 1,765 mm over the interval 1951–2012, but the recorded high annual maximum precipitation of the station was 2,599 mm in 2001 [with 1,254 mm in summer (June to August) 2001, of which 651 mm in July 2001 alone]. Even higher annual precipitation values were recorded in 2001 at other locations, e.g. 2,628 mm at Hala Gąsienicowa and 2,770 mm at Dolina Pięciu Stawów (Lorenc 2005).
The Polish (as well as Western Carpathians) record of a single 24-h precipitation event is 300 mm and was observed at Hala Gąsienicowa (northern side of the Tatra Mountains near the upper tree-line) on 30 June 1973. The downpour, which was above the 100-year return period 24-h value of 242 mm, occurred during a northern cyclonic situation (Nc). On 16 July 1934, 172 mm of precipitation was recorded in Zakopane, whereas 684 mm of precipitation was recorded during the “flood month” in July 1934 at Hala Gąsienicowa. Table 3 provides a comprehensive characterization of precipitation at the stations of Kasprowy Wierch and Zakopane (Pińskwar 2009, 2010), updated where possible, to cover the period 1951–2012. An increase in many annual indices has been observed in the series, but trends typically are not statistically significant (Pińskwar 2009, 2010). Significant upward trends in some extreme precipitation indices have been observed at the seasonal scale and for the period 1951–2007. At Kasprowy Wierch, increases in the frequency of occurrence and in precipitation totals have been found for autumn and for days with 24-h precipitation ≥10, 20 and 30 mm as well as at the 95th percentile level. At Zakopane station, significant increases in some indices (i.e. number of days with precipitation ≥20 mm, precipitation totals from days with 24-h precipitation ≥10 and 20 mm as well as at the 95th percentile level) have been found in winter (Łupikasza 2010).
The highest precipitation totals, which typically lead to floods in the Tatra Mountains and adjacent foothills and lowlands, usually occur between May and October. In Zakopane, precipitation totals during this time of the year ranged from 532 mm in 1993 to 1,285 mm in 2010. The values for the summit station at Kasprowy Wierch are much higher, ranging from 698 mm (1993) to 1,765 mm (2001). Some of these heavy summer rainfalls are clearly linked to thunderstorms (Cebulak and Niedźwiedź 1998). These events are of highest intensity and local dimension and have reached up to 90 mm h−1 in Zakopane (16 June 1977), with subsequent serious damage (Niedźwiedź and Szpetman 1978).
4 Changes in intense precipitation
Positive but insignificant trends exist in precipitation totals of the warm half-year (May–October), with magnitudes exceeding +10 mm 10 years−1 at Zakopane station (Fig. 2). A relatively dry period ending in 1957 was followed by two periods characterized by higher precipitation totals (1958–1981 and 1996–2010). Highest rainfall totals are typically recorded during summer (June–August). Seasonal totals in summer varied from 265 mm (1990) to 769 mm (2001) in Zakopane and from 300 mm (1990) to 1,254 mm (2001) at Kasprowy Wierch. No significant long-term trends were observed in the time series of summer precipitation (Fig. 2), and fluctuations in precipitation have been observed to be similar to those of warm half-year totals.
The average maximum daily precipitation total at Zakopane station, calculated from annual maximum daily totals for the period 1951–2012, was 63.9 mm with minima and maxima recorded at 29.8 mm (1993) and 138.9 mm (1970, 1973), respectively. Six other years occurred where the maximum daily precipitation total passed the threshold of 100 mm: 101.3 mm in 1960, 108.2 mm in 1962, 109.2 mm in 1983, 109.4 mm in 1985, 104.0 mm in 1997 and 113.5 mm in 2008. In addition to the extremely low value recorded in 1993, 7 years are observed where the maximum 24-h precipitation total did not exceed 40 mm, namely, in 1954 (34.8 mm), 1979 (38.0 mm), 1982 (34.2 mm), 1990 (33.4 mm) and 1998 (38.6 mm). Daily precipitation totals below the 1-day 40-mm threshold occurred in the last years of the period under investigation with 36.0 and 31.5 mm for 2011 and 2012, respectively. A statistically insignificant downward trend in maximum daily precipitation totals can be observed and has a magnitude of −2.1 mm 10 years−1 in Zakopane (Fig. 3). At shorter-time scales, however, a significant downward tendency can be recognized for the period 1973–1993 with −21.8 mm 10 years−1.
The average maximum daily precipitation total at Kasprowy Wierch, located ca. 1,100 m above Zakopane, amounts to 80 mm. The largest maximum 24-h precipitation total was recorded on 30 June 1973 with 232.0 mm and exceeded the average value by more than 4 standard deviations. The lowest maximum of daily precipitation totals was also noted in 1990 and 1992, at Zakopane, and amounted to 36.4 mm. Various statistical trends can be observed in the long-term course of the index (Fig. 3). Weak, short-term tendencies occurred in the same periods as in Zakopane station, namely, in 1951–1973 (increase), 1973–1993 (decrease) and 1993–2010 (increase).
The most damaging floods of the Tatra Mountains typically result from precipitation lasting incessantly over 3 to 5 days. For example, on 16–18 July 1934, the highest 3-day total reached 422 mm at Hala Gąsienicowa (Niedźwiedź 2003a). In Zakopane, by contrast, the highest 3-day precipitation total did not exceed 200 mm between 1951 and 2012. At Kasprowy Wierch, 3-day precipitation totals exceeded 200 mm eight times between 1962 and 2001 (Fig. 3).
Daily precipitation totals trespassing 30 and 50 mm are considered extreme events in the context of the Polish Tatra Mountains. The average number of days with precipitation ≥30 mm is 5 in Zakopane and 9 at Kasprowy Wierch. In Zakopane, the largest number of threshold exceedances was recorded in 1989 with 11 days, whereas at Kasprowy Wierch, the highest number was recorded in 2001 with 20 days. The 30-mm threshold was not passed in Zakopane in 1993. At Kasprowy Wierch station, the minimum number of threshold exceedances (2 days) was noted in 1999. The trend calculated for the entire period shows a decrease in the number of annual threshold exceedances at Kasprowy Wierch; however, the trend is not statistically significant. Stronger decreasing tendency is noticeable after 1994. No trend in the number of days under discussion is found in Zakopane (Fig. 4).
Daily precipitation totals very rarely cross the threshold of 50 mm. On average, such high 24-h precipitation is recorded once a year in Zakopane and three times a year in Kasprowy Wierch. In Zakopane, years with at least 1 day of precipitation ≥50 mm were recorded in 21 out of 62 cases. Even at Kasprowy Wierch, which is the wettest station in Poland, the threshold was not passed in 9 years (Fig. 4). In Zakopane, an exceptionally high frequency of such heavy precipitation events (50 mm 24 h−1) was recorded in 2007 and 2010 with 5 and 7 days, respectively. At Kasprowy Wierch, the maximum numbers of days with precipitation ≥50 mm occurred in 2001 and 1980 with 12 and 11 days, respectively. Both stations exhibit growing, yet insignificant tendencies in the annual number of days with daily precipitation totals ≥50 mm (Fig. 4).
5 Circulation patterns and high precipitation
Past dramatic summer floods in southern Poland have been caused typically by prolonged orographic precipitation, lasting for a few days. The occurrence of extreme precipitation thereby strongly depended on air flow direction. At the meteorological stations of Zakopane and Kasprowy Wierch, extreme precipitation occurred most frequently during situations with air flows from the north and north-east, regardless of the kind of the baric centre (Fig. 5). Dependency of intense precipitation occurrence on atmospheric circulation was studied with the circulation type scheme developed by Niedźwiedź (2013), which attributes a c to all cyclonic and an a to anticyclonic situations. Capital letters designate the air flow direction (geostrophic wind: N, NE, E, SE, S, SW, W, NW). In addition, the catalogue allows detection of the cyclonic trough with varying air flow direction and atmospheric front (Bc) as well as low pressure centres (Cc). Anticyclonic situations lacking air flow direction are designated with Ca in the case of high centres and with Ka in the case of anticyclonic wedges (Niedźwiedź 2013).
The relationship between the occurrence of very high daily precipitation (≥30 and ≥50 mm) and circulation types is presented in Fig. 5. Very high precipitation is mostly caused by cyclonic circulation types, and 3 out of the 21 analysed synoptic situations (Nc, NEc and Bc) are apparently able to cause the most extreme rainfall conditions. These situations are connected to stationary cyclones moving from the Adriatic Sea and crossing the Carpathians east of the Tatra Mountains, following the cyclone trajectory known as track Vb after van Bebber (1891). When the cyclone is blocked by the anticyclone formed over Eastern Europe, humid air masses are lifted orographically over the northern slopes of the mountains (Carpathians and the Sudetes) and thereby produce prolonged, intense rainfalls (Niedźwiedź 2003a, b). Orography is a crucial precipitation-causing factor in all high mountain areas (Sénési et al. 1996; Buzzi et al. 1998; Massacand et al. 1998; Buzzi and Foschini 2000; Ferretti et al. 2000; Schneidereit and Schär 2000; Houze 2001; Rotunno and Ferretti 2001; Pradier et al. 2004; Seibert et al. 2007). Typical cyclonic circulation types with air advection from the northern sector, cyclonic centre or cyclonic trough have been declared responsible for the most severe precipitation-induced flood events in the region (Morawska-Horawska 1971; Niedźwiedź 2003a, b; Mudelsee et al. 2004; Ustrnul and Czekierda 2001, 2009) as well as in the wider areas of Central Europe (James et al. 2004).
Figure 6 illustrates the spatial distribution of air pressure at sea level and selected geopotential heights (300, 500, 700 and 850 hPa) based on the NCEP/NCAR reanalysis data set (Kalnay et al. 1996) for 9 days with precipitation ≥100 mm in Zakopane and serious flooding in the Polish Tatras. The combinations of orography and low-pressure systems with centres located over Hungary and Ukraine force the NE advection of moist air over the Tatra Mountains and therefore usually result in heavy precipitation. The distribution of geopotential heights during these situations indicates that the low-pressure system is high with its axis inclined to south-west. Figure 7 shows the distribution of air pressure at sea level during the most severe floods in Poland in July 1970 and 1997. These events were triggered by the classic synoptic situations (Nc and NEc circulation types).
The long-term changes in the frequency of circulation types responsible for the occurrence of intense precipitation (Nc + NEc + Bc), shown in Fig. 6, give a hint as to possible future change in the frequency of extreme precipitation. The statistically significant increasing trend in the number of days with Nc + NEc + Bc circulation types (3 days per 10 years) could possibly lead to an increase in the number of extreme precipitation events. Along this line of thoughts, we recognize that the largest number of days with these circulation types occurred in 2010 (84 days), when the largest annual and warm half-year precipitation totals were recorded. The long-term trend in the number of days with circulation types that are most favourable for the occurrence of exceptionally high daily totals, exceeding 100 mm a day, is linked to Nc + NEc situations. The occurrence of this pattern is decreasing overall; however, the growing tendency beginning in the mid-1990s is noticeable (Fig. 8).
The vigorousness of dynamic processes leading to the occurrence of precipitation depends on the nature of the meteorological front and its origin (e.g. cold front, warm front, etc.). Atmospheric conditions favouring the occurrence of precipitation may also develop within the air mass of uniform temperature and humidity (non-frontal precipitation). The largest number of precipitation events ≥30 and ≥50 mm occurring at Zakopane and Kasprowy Wierch is non-frontal (ca. 40 % of all cases); this fact points quite clearly to the crucial role of orography in precipitation-causing processes. Cold fronts are another synoptic situation that has been responsible for extreme precipitation events in the past. More than 25 % of precipitation events ≥30 mm and ca. 20 % of events ≥50 mm have been caused by cold fronts. The smallest number of days with extreme precipitation is, in contrast, related to warm and stationary fronts (Fig. 9).
6 Conclusions
The meteorological stations in the Polish Tatra Mountains record the largest precipitation totals of the country, and intense and long-lasting precipitation in this region has also been responsible for several large floods that were initiated in the Tatra Mountains and its foothills and propagated downstream to the River Vistula (Morawska-Horawska 1971; Niedźwiedź 1999; Niedźwiedź et al. 1999; Starkel 2001).
The FLORIST project will contribute to an improved understanding and a reduction of uncertainty in the interpretation of changes in the frequency and magnitude of intense precipitation, torrential processes and river floods in mountainous watersheds (Kundzewicz et al. 2013) and will possibly help to improve current evidence which often remains conflicting. Indications exist for an increase in the frequency and intensity of heavy precipitation events (Kundzewicz et al. 2006) in some parts of Poland, but the signal is not persistent. The fact that results remain contradictory and that they differ significantly between different regions within Poland clearly highlights the necessity to continue efforts to solve this problem of vast practical relevance and to launch projects at the local and regional scales.
Climate models predict increased duration, severity and frequency of intense precipitation over some areas of Poland which, in turn, might translate into increased climate-related flood risks (Kundzewicz and Schellnhuber 2004). However, current knowledge of these processes in mountainous and piedmont areas of Poland is based on existing observational records. As a matter of fact, results of these studies will typically be study- and site-specific and depend on the model(s) used. A generalization of case-study conclusions does not therefore seem possible.
An increase in several annual indices of extreme precipitation in the foothills of the Tatra Mountains has been observed in this study, but trends typically are not statistically significant. Clearly, changes in annual and seasonal indices of intense precipitation in Zakopane and Kasprowy Wierch, as described in this paper, are dominated by natural variability which might eventually blur some of the possible trends. Trend directions may also vary between the stations investigated; in three out of seven indices analysed in this contribution (i.e. maximum daily precipitation totals, 3-day precipitation total, number of days with precipitation ≥30 mm), opposing trends exist between Zakopane and Kasprowy Wierch. In contrast, both stations exhibit upward trends in maximum daily, maximum 5-day and summer half-year precipitation totals as well as in the frequency of days with precipitation ≥50 mm, but none of the trends were statistically significant.
Three cyclonic circulation types have been identified in this paper to be responsible for the triggering of the most extreme rainfall conditions in the Tatra Mountains, namely, Nc, NEc and Bc. These situations are connected to stationary cyclones originating in the Adriatic Sea and propagating with track Vb after van Bebber (1891). However, despite circulation, orography has proven to play a crucial role in the formation of intense precipitation in the area under investigation. In this sense, most occurrences of intense precipitation events evolve in air masses of uniform temperature and humidity (non-frontal precipitation). In conclusion, the long-term increase in the frequency of circulation types responsible for the largest frequency of extreme precipitation has been documented in this paper and may provide hints as to future changes in extreme precipitation in the Polish Tatra Mountains.
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Acknowledgments
This contribution has been supported by the FLORIST (Flood risk on the northern foothills of the Tatra Mountains) project, PSPB no. 153/2010, through a grant from Switzerland through the Swiss Contribution to the enlargement of the European Union. The project makes use of hydrometeorological data provided by the Institute of Meteorology and Water Management–State Research Institute (IMGW–PIB) and data published (1954–1981) in the annals “Opady Atmosferyczne”. Data for the period 2000–2012 have been obtained from the SYNOP messages database OGIMET. Images of synoptic maps were retrieved from the NOAA/ESRL Physical Sciences Division, Boulder Colorado (http://www.esrl.noaa.gov/psd/) and from the NCEP/NCAR reanalysis data set.
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Niedźwiedź, T., Łupikasza, E., Pińskwar, I. et al. Variability of high rainfalls and related synoptic situations causing heavy floods at the northern foothills of the Tatra Mountains. Theor Appl Climatol 119, 273–284 (2015). https://doi.org/10.1007/s00704-014-1108-0
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DOI: https://doi.org/10.1007/s00704-014-1108-0