edu.ucar.opensky::articles:10887 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T14:09:21.225755 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7125t73 Study of the formation of the "black cloud" and its dynamics over Cairo, Egypt, using MODIS and MISR sensors 2010-11-10T00:00:00Z publication https://n2t.org/ark:/85065/d7125t73 https://doi.org/10.1029/2010JD014384 Marey, Heba allah Said author Gille, John author El-Askary, H. author Shalaby, E. author El-Raey, M. author UCAR/NCAR - Library publisher In the past decade, episodes of severe air pollution, known as the "black cloud," have occurred in Cairo, Egypt, in the early autumn. In this study, data from the Moderate Resolution Imaging Spectrometer (MODIS) and the Multi-angle Imaging Spectroradiometer (MISR) are used with meteorological data and trajectory analyses to determine the cause of these events. MODIS fire counts put the source as the burning of agricultural waste after harvest season in the Nile delta region. Synchronous MISR data show that these fires create low altitude (< 500 m) plumes of smoke and aerosols which flow over Cairo in a few hours, as confirmed by Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) forward trajectory analyses. Much of the burning occurs at night, when an inversion constrains the plumes to remain in the boundary layer (BL). Convection during the day raises the BL, dispersing these smoke particles until the next night. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2010 American Geophysical Union. None eng geoscientificInformation