Frequency and thickness of snow cover at the foot of the Babia Góra Massif in the winter seasons 1960/61 to 2014/15

Q4 Agricultural and Biological Sciences
Paweł Franczak
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引用次数: 3

Abstract

Abstract The aim of the study was to gain knowledge about changes in the nival conditions prevailing in the lower part of the Babia Góra massif in the winter, during the period from 1960/61 to 2014/15. The performed analyses concerned the daily snow cover thickness in the winter seasons of the years 1960/61–2014/15, and were based on data recorded by a meteorological station established by the Institute of Meteorology and Water Management – National Research Institute (IMGW-PIB) in Zawoja (697 m altitude). The study was focused on the period from the first to the last day of the appearance of the snow cover in the season. Based on long-term measurements carried out in in Zawoja, it was found that the average length of the occurrence of snow cover with the thickness of ≥ 1 cm was 104 days, which showed variability in individual seasons that ranged from 47 days in 2013/14 to 145 days in 1993/94. It was noted that the period of snow cover occurrence was shortened – from 118 days in the decade 1960/61–1969/70 to 96 days in the recent decade (2000/01–2009/10). The potential duration of snow cover was on average 157 days. The snowiest months were February and January, when snow cover occurred for 81% and 75% of all the observation days, respectively. The largest thickness of snow cover was recorded during these two months, with the maximum of 178 cm (January 30, 1976). In contrast, snow cover was not observed in July, August and September. The studied multi-year period was characterised by high variability of the winter snowiness index: from 1.61 in 2013/14 to 8.00 in 1962/63. In the period 1960/61–2014/15, in Zawoja, there was observed the distinct periodicity (16–19 years) with regard to the number of days with snow cover, the average and total snow cover and the winter snowiness.
1960/61 ~ 2014/15冬季巴比亚Góra山脚下积雪频率和厚度
摘要:本研究旨在了解1960/61 - 2014/15年间Babia Góra地块下部冬季气候条件的变化情况。利用气象与水管理研究所-国家研究所(IMGW-PIB)在Zawoja(海拔697 m)建立的气象站记录的数据,对1960/61-2014/15年冬季日积雪厚度进行了分析。研究的重点是从季节中积雪出现的第一天到最后一天。在扎沃加进行的长期观测中发现,厚度≥1 cm积雪的平均出现时间为104 d,且存在季节差异,2013/14年为47 d, 1993/94年为145 d。积雪发生周期由1960/61-1969/70年的118天缩短至近10年(2000/01-2009/10)的96天。积雪的潜在持续时间平均为157天。积雪最多的月份为2月和1月,分别占总观测日数的81%和75%。这两个月的积雪厚度最大,最高为178厘米(1976年1月30日)。7、8、9月无积雪。所研究的多年期的特征是冬季积雪指数的高变率:从2013/14年的1.61到1962/63年的8.00。1960/61 ~ 2014/15年间,扎沃加地区积雪日数、平均积雪和总积雪以及冬季积雪量具有明显的周期性(16 ~ 19年)。
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来源期刊
USDA Forest Service - Research Papers PNW-RP
USDA Forest Service - Research Papers PNW-RP Agricultural and Biological Sciences-Forestry
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