Delineation of dew formation zones in Iran using long-term model simulations and cluster analysis

Show full item record



Atashi , N , Rahimi , D , Sinclair , V A , Zaidan , M A , Rusanen , A , Vuollekoski , H , Kulmala , M , Vesala , T & Hussein , T 2021 , ' Delineation of dew formation zones in Iran using long-term model simulations and cluster analysis ' , Hydrology and Earth System Sciences , vol. 25 , no. 8 , pp. 4719-4740 .

Title: Delineation of dew formation zones in Iran using long-term model simulations and cluster analysis
Author: Atashi, Nahid; Rahimi, Dariush; Sinclair, Victoria A.; Zaidan, Martha A.; Rusanen, Anton; Vuollekoski, Henri; Kulmala, Markku; Vesala, Timo; Hussein, Tareq
Contributor organization: Air quality research group
Institute for Atmospheric and Earth System Research (INAR)
Helsinki Institute of Sustainability Science (HELSUS)
Global Atmosphere-Earth surface feedbacks
INAR Physics
Viikki Plant Science Centre (ViPS)
Micrometeorology and biogeochemical cycles
Ecosystem processes (INAR Forest Sciences)
Date: 2021-08-31
Language: eng
Number of pages: 22
Belongs to series: Hydrology and Earth System Sciences
ISSN: 1027-5606
Abstract: Dew is a non-conventional source of water that has been gaining interest over the last two decades, especially in arid and semi-arid regions. In this study, we performed a long-term (1979-2018) energy balance model simulation to estimate dew formation potential in Iran aiming to identify dew formation zones and to investigate the impacts of long-term variation in meteorological parameters on dew formation. The annual average of dew occurrence in Iran was similar to 102 d, with the lowest number of dewy days in summer (similar to 7 d) and the highest in winter (similar to 45 d). The average daily dew yield was in the range of 0.03-0.14 Lm(-2) and the maximum was in the range of 0.29-0.52 Lm(-2). Six dew formation zones were identified based on cluster analysis of the time series of the simulated dew yield. The distribution of dew formation zones in Iran was closely aligned with topography and sources of moisture. Therefore, the coastal zones in the north and south of Iran (i.e., Caspian Sea and Oman Sea), showed the highest dew formation potential, with 53 and 34 Lm(-2) yr(-2), whereas the dry interior regions (i.e., central Iran and the Lut Desert), with the average of 12-18 Lm(-2) yr(-2), had the lowest potential for dew formation. Dew yield estimation is very sensitive to the choice of the heat transfer coefficient. The uncertainty analysis of the heat transfer coefficient using eight different parameterizations revealed that the parameterization used in this study the Richards (2004) formulation - gives estimates that are similar to the average of all methods and are neither much lower nor much higher than the majority of other parameterizations and the largest differences occur for the very low values of daily dew yield. Trend analysis results revealed a significant (p < 0:05) negative trend in the yearly dew yield in most parts of Iran during the last 4 decades (1979-2018). Such a negative trend in dew formation is likely due to an increase in air temperature and a decrease in relative humidity and cloudiness over the 40 years.
1172 Environmental sciences
1171 Geosciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

Files in this item

Total number of downloads: Loading...

Files Size Format View
hess_25_4719_2021.pdf 13.56Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record