An Attempt to Utilize a Regional Dew Formation Model in Kenya

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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 (Basel) , vol. 13 , no. 9 , 1261 .

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 organization: Air quality research group
Institute for Atmospheric and Earth System Research (INAR)
Department of Agricultural Sciences
Helsinki Institute of Sustainability Science (HELSUS)
Department of Geosciences and Geography
Global Atmosphere-Earth surface feedbacks
INAR Physics
Earth Change Observation Laboratory (ECHOLAB)
Viikki Plant Science Centre (ViPS)
Micrometeorology and biogeochemical cycles
Ecosystem processes (INAR Forest Sciences)
Date: 2021-05
Language: eng
Number of pages: 20
Belongs to series: Water (Basel)
ISSN: 2073-4441
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
1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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