Precipitation trend analysis in Macta basin (northwest of Algeria)

This study aims at investigating annual and seasonal precipitation trend over Macta basin (northwest of Algeria) using the Mann–Kendall (MK) test, the modified Mann–Kendall (MMK) test, and the Innovative Trend Analysis (ITA). To achieve this aim, the monthly precipitation amounts from 48 meteorologi...

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Bibliographic Details
Published in:Arabian journal of geosciences 2022, Vol.15 (24), Article 1762
Main Authors: Benabdelkrim, Mohammed El Amin, Ghenim, Abderrahmane Nekkache, Megnounif, Abdesselam
Format: Article
Language:English
Subjects:
Annual precipitation
Autumn
Coastal zone
Dry season
Earth and Environmental Science
Earth science
Earth Sciences
Original Paper
Precipitation
Rainfall
Rainy season
Seasons
Tests
Trend analysis
Trends
Weather stations
Wet season
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Summary:This study aims at investigating annual and seasonal precipitation trend over Macta basin (northwest of Algeria) using the Mann–Kendall (MK) test, the modified Mann–Kendall (MMK) test, and the Innovative Trend Analysis (ITA). To achieve this aim, the monthly precipitation amounts from 48 meteorological stations for the period between 1974–1975 and 2011–2012 have been used. At the annual scale, the MK and MMK tests revealed that 19 stations (40%) show significant trends, while for the ITA method, the number of stations that shows a significant trend is greater (37 stations). Findings also unveiled that there is the sub-region of decreasing trends in the northern part close to the Mediterranean Sea coastal area, particularly in the western part, whereas in the south the trends are rather positive. At seasonal scale, the MK and MMK tests show few significant trends. In autumn, precipitation increases (42 stations up and 6 down). In winter, spring, and summer, the number of positive and negative trends is almost equal. The ITA method, whose significant trends are once again greater, shows that in autumn, 60% of the series are positive while 40% are negative. For the other seasons, the number of stations with decreasing trends is slightly greater than those increasing. Thus, seasonal precipitation tends to increase during the dry season mainly in autumn. Conversely, during the rainy season, precipitation undergoes a negative trend. Findings also unveiled that the ITA approach produces more significant results than the MK and MMK tests. Similarly, study of spatiotemporal trends showed a complex behavior.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-022-10991-w