An Attempt to Utilize a Regional Dew Formation Model in Kenya

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http://hdl.handle.net/10138/330561

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Atashi , N , Tuure , J , Alakukku , L , Rahimi , D , Pellikka , P , Zaidan , M A , Vuollekoski , H , Rasanen , M , Kulmala , M , Vesala , T & Hussein , T 2021 , ' An Attempt to Utilize a Regional Dew Formation Model in Kenya ' , Water , vol. 13 , no. 9 , 1261 . https://doi.org/10.3390/w13091261

Title: An Attempt to Utilize a Regional Dew Formation Model in Kenya
Author: Atashi, Nahid; Tuure, Juuso; Alakukku, Laura; Rahimi, Dariush; Pellikka, Petri; Zaidan, Martha Arbayani; Vuollekoski, Henri; Rasanen, Matti; Kulmala, Markku; Vesala, Timo; Hussein, Tareq
Contributor: University of Helsinki, Air quality research group
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Viikki Plant Science Centre (ViPS)
University of Helsinki, Air quality research group
Date: 2021-05
Language: eng
Number of pages: 20
Belongs to series: Water
ISSN: 0310-0367
URI: http://hdl.handle.net/10138/330561
Abstract: Model evaluation against experimental data is an important step towards accurate model predictions and simulations. Here, we evaluated an energy-balance model to predict dew formation occurrence and estimate its amount for East-African arid-climate conditions against 13 months of experimental dew harvesting data in Maktau, Kenya. The model was capable of predicting the dew formation occurrence effectively. However, it overestimated the harvestable dew amount by about a ratio of 1.7. As such, a factor of 0.6 was applied for a long-term period (1979-2018) to investigate the spatial and temporal variation of the dew formation in Kenya. The annual average of dew occurrence in Kenya was similar to 130 days with dew yield > 0.1 L/m(2)/day. The dew formation showed a seasonal cycle with the maximum yield in winter and minimum in summer. Three major dew formation zones were identified after cluster analysis: arid and semi-arid regions; mountain regions; and coastal regions. The average daily and yearly maximum dew yield were 0.05 and 18; 0.9 and 25; and 0.15 and 40 L/m(2)/day; respectively. A precise prediction of dew occurrence and dew yield is very challenging due to inherent limitations in numerical models and meteorological input parameters.
Subject: dew yield
spatial and temporal
cluster analysis
dew formation zones
arid
semi-arid
CLUSTER-ANALYSIS
CLIMATE ZONES
NEGEV DESERT
WATER
COLLECTION
RAIN
FOG
PERFORMANCE
ATMOSPHERE
DISTANCE
1172 Environmental sciences
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