Preprint Article Version 1 This version is not peer-reviewed

Effects of Water Level Decline in Lake Urmia, Iran, on Local Climate Conditions

Version 1 : Received: 7 July 2020 / Approved: 9 July 2020 / Online: 9 July 2020 (02:07:35 CEST)

A peer-reviewed article of this Preprint also exists.

Dehghanipour, A.H.; Moshir Panahi, D.; Mousavi, H.; Kalantari, Z.; Tajrishy, M. Effects of Water Level Decline in Lake Urmia, Iran, on Local Climate Conditions. Water 2020, 12, 2153. Dehghanipour, A.H.; Moshir Panahi, D.; Mousavi, H.; Kalantari, Z.; Tajrishy, M. Effects of Water Level Decline in Lake Urmia, Iran, on Local Climate Conditions. Water 2020, 12, 2153.

Journal reference: Water 2020, 12, 2153
DOI: 10.3390/w12082153

Abstract

Lake Urmia in northwestern Iran is the largest lake in Iran and the second largest saltwater lake in the world. The water level in Lake Urmia has decreased dramatically in recent years, due to drought, climate change, and overuse of water resources for irrigation. This shrinking of the lake may affect local climate conditions, assuming that the lake itself affects the local climate. In this study, we quantified the lake’s impact on the local climate by analyzing hourly time series of data on climate variables (temperature, vapor pressure, relative humidity, evaporation, and dewpoint temperature for all seasons, and local lake/land breezes in summer) for the period 1961-2016. For this, we compared high quality, long-term climate data obtained from Urmia and Saqez meteorological stations, located 30 km and 185 km from the lake center, respectively. We then investigated the effect of lake level decrease on the climate variables by dividing the data into 1961-1995 (normal lake level) and 1996-2016 (low lake level). The results showed that at Urmia station (close to the lake), climate parameters displayed fewer fluctuations and were evidently affected by Lake Urmia compared with those at Saqez station. The effects of the lake on the local climate increased with increasing temperature, with the most significant impact in summer and the least in winter. The results also indicated that, despite decreasing lake level, local climate conditions are still influenced by Lake Urmia, but to a lesser extent.

Subject Areas

Lake Urmia; Local climate; Temperature adjustment; lake/land breeze

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