A new perspective on the sunshine duration variability
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985807%3A_____%2F20%3A00518037" target="_blank" >RIV/67985807:_____/20:00518037 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/s00704-019-03046-w" target="_blank" >http://dx.doi.org/10.1007/s00704-019-03046-w</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00704-019-03046-w" target="_blank" >10.1007/s00704-019-03046-w</a>
Alternative languages
Result language
angličtina
Original language name
A new perspective on the sunshine duration variability
Original language description
The sunshine duration data is analysed here from a new perspective, different from the traditional ones. The study is focused on pairs of periods of shining sun (called clear periods) followed by periods with the sun covered by clouds (called dark periods). Their statistical and sequential properties are illustrated by using results obtained from satellite observations and ground measurements at Timisoara (Romania). Solar irradiance time series measured at ground are converted into a database consisting of pairs of clear/dark periods. These pairs are associated with three cloud classes derived from satellite observations: C1 (the sky is cloud-free), C2 (cloudy sky) and C3 (sky with semi-transparent or fractional clouds). The study was conducted by using tools from survival analysis. This is a novelty in sunshine duration analysis. Since information is missing during the night, the clear/dark period correlation was studied considering a censoring procedure (for all nine combinations of cloud types at the beginning of dark and clear intervals). Cox regression has been used to study the influence of covariates (such as extraterrestrial solar irradiance and sun elevation angle) on sunshine duration distribution. Results show that increase of extraterrestrial solar radiation tends to increase the risk of stopping any clear or dark interval, i.e. it tends to increase the variability in solar irradiance. Regardless of cloud class, stochastically shorter intervals are found for increasing sun elevation angle.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10103 - Statistics and probability
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Theoretical and Applied Climatology
ISSN
0177-798X
e-ISSN
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Volume of the periodical
139
Issue of the periodical within the volume
3-4
Country of publishing house
AT - AUSTRIA
Number of pages
12
Pages from-to
1219-1230
UT code for WoS article
000499198700001
EID of the result in the Scopus database
2-s2.0-85075910713