Muhammed ElTahan | Searcharxiv

arXiv2019

Spatiotemporal Assessment of So2, SO4 and AOD from over MENA Domain from 2006 to 2016 Using multiple satellite Data and Reanalysis MERRA2 Data

The sulfur pollutants are the source of a sizeable portion of the air pollution. In this work, the spatial distribution and temporal trend of the mass concentration of two of the critical sulfur pollutants, SO2 and SO4, in addition to the aerosol optical properties (AOD) were analyzed over the region of the Middle East and North Africa (MENA) from multiple satellite resources and Modern Era Retrospective Analysis for Research and Applications version 2 (MERRA2) reanalysis data. The So2 and So4 data used in these analyses are obtained from (MERRA2) with a resolution of 0.5 x 0.625 deg throughout a period of 10 years (2005 to 2015). On the other hand, the temporal trend and spatial distribution of AOD was identified from four different satellite data. (1) moderate resolution imaging spectroradiometer (MODIS) Level 3 AOD data at 550 nm wavelengths from Collection 6 algorithm (combined dark target and deep blue algorithms) are used for 10 years temporal analysis (2006 to 2015). Data were obtained for the period 2006 to 2015 (2) Multi angle imaging spectroradiometer (MISR) with 0.5 deg spatial resolution for the same 10 years (2006 to 2015). (3) Sea Viewing Wide Field of View Sensor (SeaWIFS) with 0.5 deg for the period (2005 to 2010). (4) Ozone Monitoring Instrument (OMI) AOD at 500 nm wavelength with resolution 1 degree.

physics.ao-ph↗

arXiv2017

Evaluation of different WRF microphysics schemes: severe rainfall over Egypt case study

Egypt faced heavy rainfall starting from 26th October 2016 which caused flooding in Upper Egypt and Red Sea Coast especially the city of Ras Gharib. In this work, Weather Research and Forecasting (WRF) model was used with one domain of 10-km resolution for three days starting from 26th October 2016 to simulate this severe rainy event in terms of precipitation, temperature, pressure and wind speed. In order to use the WRF model several schemes should be configured, one of them is the microphysics scheme. Microphysics is the process by which moisture is removed from the air, based on other thermodynamic and kinematic fields represented within the numerical models. Sensitivity of ten microphysics schemes were tested (Kessler, Lin, WRF single moment 3 and 5 class, Eta (Ferrier), WRF single Scheme 6 Class, Goddard, Thompson, Milbrandt-Yau Double Moment and Morrison double moment). The output temperature and precipitation from the model were compared to the satellite data obtained from Moderate Resolution Imaging Spectroradiometer (MODIS) and Tropical Rainfall Measuring Mission (TRMM), respectively. Our analysis showed that the model has the capability to simulate the rainy event spatially and produce the cloud pattern. Three coastal areas were chosen for this study, the city of Ras Gharib, Wadi Elgemal National park, and Elba National park. The results showed that the model generally tends to overestimate the precipitation for all the ten schemes and underestimated temperature compared to TRMM and MODIS data respectively

physics.ao-ph↗