Preprints
https://doi.org/10.5194/hess-2021-54
https://doi.org/10.5194/hess-2021-54

  18 Feb 2021

18 Feb 2021

Review status: a revised version of this preprint was accepted for the journal HESS and is expected to appear here in due course.

Delineation of Dew Formation Zones in Iran Using Long-Term Model Simulations and Cluster Analysis

Nahid Atashi1,2, Dariush Rahimi1, Victoria A. Sinclair2, Martha A. Zaidan2, Anton Rusanen2, Henri Vuollekoski2, Markku Kulmala2, Timo Vesala2,3, and Tareq Hussein2,4 Nahid Atashi et al.
  • 1Faculty of Geographical science and Planning, University of Isfahan, Isfahan, 8174673441, Iran
  • 2Institute for Atmospheric and Earth System Research (INAR/Physics), Faculty of Science, University of Helsinki, Helsinki, FI-00014, Finland
  • 3Institute for Atmospheric and Earth System Research (INAR/Forest), Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, FI-00014, Finland
  • 4School of Science, Department of Physics, University of Jordan, Amman, 11942, Jordan

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 ~ 102 days, with the lowest number of dewy days in summer (~ 7 days) and highest in winter (~ 45 days). The average daily dew yield was in the range of 0.03–0.14 L/m2 and the maximum was in the range of 0.29–0.52 L/m2. Six dew formation zones were identified based on cluster analysis of the timeseries 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 L/m2/year, whereas the dry interior regions (i.e., central Iran and the Lut Desert), with the average of 12–18 L/m2/year had the lowest potential for dew formation. Trend analysis results revealed a significance (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 40 years.

Nahid Atashi et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Referee Comment on hess-2021-54', Al-Kuisi Mustafa, 24 Mar 2021
    • AC1: 'Reply on CC1', Tareq Hussein, 27 Apr 2021
  • RC1: 'Comment on hess-2021-54', Anonymous Referee #1, 25 Mar 2021
    • AC2: 'Reply on RC1', Tareq Hussein, 27 Apr 2021
  • RC2: 'Comment on hess-2021-54', Anonymous Referee #2, 11 Apr 2021
    • AC3: 'Reply on RC2', Tareq Hussein, 27 Apr 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Referee Comment on hess-2021-54', Al-Kuisi Mustafa, 24 Mar 2021
    • AC1: 'Reply on CC1', Tareq Hussein, 27 Apr 2021
  • RC1: 'Comment on hess-2021-54', Anonymous Referee #1, 25 Mar 2021
    • AC2: 'Reply on RC1', Tareq Hussein, 27 Apr 2021
  • RC2: 'Comment on hess-2021-54', Anonymous Referee #2, 11 Apr 2021
    • AC3: 'Reply on RC2', Tareq Hussein, 27 Apr 2021

Nahid Atashi et al.

Nahid Atashi et al.

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Short summary
Dew formation potential during a long-term period (1979–2018) was assessed in Iran aiming to identify dew formation zones and to investigate the impacts of long-term variation in meteorological parameters on dew formation.