Version 1
: Received: 2 January 2024 / Approved: 3 January 2024 / Online: 4 January 2024 (03:28:00 CET)
Version 2
: Received: 21 June 2024 / Approved: 24 June 2024 / Online: 24 June 2024 (08:43:46 CEST)
How to cite:
Rasoafaniry, A.; Muselli, M.; Beysens, D. Climate Change and Dew and Rain Evolution in Semi-arid South-Western Madagascar between 1991 and 2033 (Extrapolated). Preprints2024, 2024010198. https://doi.org/10.20944/preprints202401.0198.v2
Rasoafaniry, A.; Muselli, M.; Beysens, D. Climate Change and Dew and Rain Evolution in Semi-arid South-Western Madagascar between 1991 and 2033 (Extrapolated). Preprints 2024, 2024010198. https://doi.org/10.20944/preprints202401.0198.v2
Rasoafaniry, A.; Muselli, M.; Beysens, D. Climate Change and Dew and Rain Evolution in Semi-arid South-Western Madagascar between 1991 and 2033 (Extrapolated). Preprints2024, 2024010198. https://doi.org/10.20944/preprints202401.0198.v2
APA Style
Rasoafaniry, A., Muselli, M., & Beysens, D. (2024). Climate Change and Dew and Rain Evolution in Semi-arid South-Western Madagascar between 1991 and 2033 (Extrapolated). Preprints. https://doi.org/10.20944/preprints202401.0198.v2
Chicago/Turabian Style
Rasoafaniry, A., Marc Muselli and Daniel Beysens. 2024 "Climate Change and Dew and Rain Evolution in Semi-arid South-Western Madagascar between 1991 and 2033 (Extrapolated)" Preprints. https://doi.org/10.20944/preprints202401.0198.v2
Abstract
In the context of global warming and increasing scarcity of fresh water resources, it becomes significant to evaluate the contribution and evolution of non-rainfall waters such as dew. This study therefore aims to evaluate the relative dew and rain contributions in three sites of south-western of Madagascar (Ifaty, Toliara and Andremba), a semi-arid region which suffers from a strong water deficit. The studied period is 1/1991 – 7/2023, with extrapolation to 8/2033. Dew is calculated from meteo data by using a well-established energy model. The extrapolation of dew and rain follows an artificial neural network approach. It is found that dew forms regularly (2-3 days in average between events), in contrast to rain (10-15 days). The evolutions of dew and rain are similar, with an increase from 1991 to 2000, a decrease up to 2020 and a further increase until 2033. These oscillations follow the Indian Ocean dipole variations and should be influenced by the climate change. Dew contribution to the water balance remains modest on a yearly basis (3-4%) but is important during the dry season (Apr.-Oct.), up to 30%. Dew therefore appears to be a reliable and sustainable resource for plants, small animals and population, especially during droughts.
Environmental and Earth Sciences, Atmospheric Science and Meteorology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
