ملخص الجهاز:
3 1- PhD of Geomorphology, Hakim Sabzevari University, Sabzevar, Iran 2- Professor Department of Natural Geography, Hakim Sabzevari University, Sabzevar, Iran 3- Associate Professor Department of Natural Geography, Hakim Sabzevari University, Sabzevar, Iran Received: 26 December 2021 Accepted: 25 April 2022 Extended Abstract Introduction Wind is one of the important causes of erosion in arid and semi-arid regions, which due to the limited vegetation in these areas, is able to move portable particles and results in wind erosion.
Wind erosion is a process that occurs because of increased speed and due to wind turbulence on a surface free of cover and as one of the main factors of land degradation and limiting soil fertility has created serious problems in many parts of the world, including Iran.
The results of calculating the wind erosion threshold in the study area showed a threshold speed of 6-15 m / s in different facies.
Student of Agroclimatology, University of Isfahan, Isfahan, Iran 2- Associate Professor of climatology, University of Isfahan, Isfahan, Iran 3- Associate Professor of Remote Sensing Engineering, University of Isfahan, Isfahan, Iran Received: 27 December 2021 Accepted: 26 April 2022 Extended abstract Introduction Vegetation indices )VI) time-series have been used for land surface phenology retrieval but these time series are affected by clouds and aerosols, which add noise to the signal sensor.
In order to identify synoptic patterns at the time of TP occurrence, synoptic maps of geopotential height and jet stream for atmospheric indices )200 and 300 hPa) were drawn in GRADS environment using ERA5 data.