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Title variants
Dry and wet periods in Łódź in XXth century
Languages of publication
Abstracts
Artykuł powstał w wyniku prac badawczych prowadzonych w ramach Projektu Zamawianego MNiI (K091/P04/2004/11).
The aim of this work is to present the results of total daily precipitation series, which had
been registered in Łódź in 1904-2000. In the structure of daily precipitation conditions the
days without falls (54.2%) and with falls of 0.1-4.9 mm (36.1%) were dominant. Total
maximum daily precipitation changed perennially from 14.2 mm to 103.5 mm. The longest continuous peńods of dryness in Łódź lasted 45 days, whereas the longest periods of continuous
falling lasted 31 days. It was observed that 40's and 50's were the years of the most frequent
dry periods. Maximum length of continuous precipitation periods shortened from 30 days in
30's to 14 and 15 days in 80's and 90's. Looking for long lasting tendencies of the time
changeability of precipitation characteristics by using non-parametric test by Mann-Kendall
and non-parametric Sen's method, which is used for calculating regression coefficients in linear
trends equations, shows lack of statistically significant tendencies. This happens in case of daily
capacities and extreme total fall, as well as total annual number of days without and with
falling being equal or bigger than 5 mm and ~ 10 mm. Positive trends, statistically significant
on a level of 0.05 characterize dryness indices in February and April, while indices on a 0.01
level are characteristic for August.
been registered in Łódź in 1904-2000. In the structure of daily precipitation conditions the
days without falls (54.2%) and with falls of 0.1-4.9 mm (36.1%) were dominant. Total
maximum daily precipitation changed perennially from 14.2 mm to 103.5 mm. The longest continuous peńods of dryness in Łódź lasted 45 days, whereas the longest periods of continuous
falling lasted 31 days. It was observed that 40's and 50's were the years of the most frequent
dry periods. Maximum length of continuous precipitation periods shortened from 30 days in
30's to 14 and 15 days in 80's and 90's. Looking for long lasting tendencies of the time
changeability of precipitation characteristics by using non-parametric test by Mann-Kendall
and non-parametric Sen's method, which is used for calculating regression coefficients in linear
trends equations, shows lack of statistically significant tendencies. This happens in case of daily
capacities and extreme total fall, as well as total annual number of days without and with
falling being equal or bigger than 5 mm and ~ 10 mm. Positive trends, statistically significant
on a level of 0.05 characterize dryness indices in February and April, while indices on a 0.01
level are characteristic for August.
Publisher
Year
Volume
Physical description
Dates
published
2007
Contributors
References
Document Type
Publication order reference
Identifiers
URI
http://hdl.handle.net/11089/2856
YADDA identifier
bwmeta1.element.hdl_11089_2856
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