Title :

Aerosol Optical Properties and Types over Southern Africa and Reunion Island Determined from Ground-Based and Satellite Observations over a 13-Year Period (2008-2021)

Author(s) :

Ranaivombola, Marion [Auteur]
Laboratoire de l'Atmosphère et des Cyclones [LACy]
Begue, Nelson [Auteur]
Laboratoire de l'Atmosphère et des Cyclones [LACy]
Bencherif, Hassan [Auteur]
University of KwaZulu-Natal [Durban, Afrique du Sud] [UKZN]
Millet, Tristan [Auteur]
Laboratoire de l'Atmosphère et des Cyclones [LACy]
Sivakumar, Venkataraman [Auteur]
University of KwaZulu-Natal [Durban, Afrique du Sud] [UKZN]
Duflot, Valentin [Auteur]
Laboratoire de l'Atmosphère et des Cyclones [LACy]
Baron, Alexandre [Auteur]
Laboratoire de l'Atmosphère et des Cyclones [LACy]
NOAA Chemical Sciences Laboratory [CSL]
Cooperative Institute for Research in Environmental Sciences [CIRES]
Mbatha, Nkanyiso [Auteur]
Departement of Geography [UniZulu]
Piketh, Stuart [Auteur]
North-West University [Potchefstroom] [NWU]
Formenti, Paola [Auteur]
Laboratoire Interuniversitaire des Systèmes Atmosphériques [LISA (UMR_7583)]
Goloub, Philippe [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Journal title :

Remote Sensing

Abbreviated title :

Remote Sens.

Volume number :

15

Pages :

-

Publication date :

2023-05-31

ISSN :

2072-4292

English keyword(s) :

AOD
aerosol type
AERONET
MODIS
CALIOP
biomass burning season

HAL domain(s) :

Planète et Univers [physics]/Océan, Atmosphère

English abstract : [en]

Fires occur seasonally in Southern Africa, from June to November, increasing tropospheric aerosol loading and triggering harmful consequences for the environment and human health. This study aims to examine 13 years of ...
Show more >Fires occur seasonally in Southern Africa, from June to November, increasing tropospheric aerosol loading and triggering harmful consequences for the environment and human health. This study aims to examine 13 years of aerosol optical characteristics and types over Southern Africa and Reunion Island. Using AERONET sun photometers and MODIS observations, we found that a high aerosol optical depth and Angström exponent are associated with two predominant types of aerosols (biomass burning/urban industrial and mixed type) throughout the spring season. According to CALIOP observations, the major aerosol types with occurrence frequencies above 10% are polluted continental/smoke, polluted dust, and elevated smoke, whereas dust, clean continental, and dusty marine have occurrence frequencies below 1%. In comparison to other seasons, the vertical profiles of elevated smoke have different shapes in spring, with a seasonal shift in the peak altitude (from 3-4 km), when fire activity is at its maximum. At these altitudes, the northern regions presented occurrence frequencies of 32% on average, while lower values were found for the southern or farthest regions (<10-20% on average). The Lagrangian HYSPLIT model back-trajectories demonstrated eastward transport, with air masses from South America and the Atlantic Ocean that recirculate around the study sites. The aerosols are mainly derived from active biomass burning areas near the study sites and, to a lesser extent, from remote sources such as South America.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

• Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Submission date :

2024-01-16T23:00:05Z
2024-02-14T09:52:40Z