The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity
One of the worst haze events to ever hit Peninsular Malaysia occurred in June 2013 due to smoke from Riau, Central Sumatra. While biomass-burning in the region is common, the early occurrence of a haze episode of this magnitude was uncharacteristic of the seasonality of extreme fire events, which us...
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doaj-0a047898c79d453f8db340664c9792c92020-11-25T00:33:36ZengMDPI AGAtmosphere2073-44332020-01-011115510.3390/atmos11010055atmos11010055The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone ActivityYaasiin Oozeer0Andy Chan1Jun Wang2Jeffrey S. Reid3Santo V. Salinas4Maggie C. G. Ooi5Kenobi I. Morris6Department of Geography and Environmental Management, University of Waterloo, Waterloo, ON N2L 3G1, CanadaFaculty of Science and Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor 43500, MalaysiaDepartment of Chemical and Biochemical Engineering, College of Engineering, University of Iowa, Iowa City, IA 52242, USAMarine Meteorology Division, U.S. Naval Research Laboratory, Monterey, CA 93943, USACentre for Remote Imaging, Sensing and Processing, National University of Singapore, Singapore 119076, SingaporeCloud and Aerosol Lab, Department of Atmospheric Sciences, National Central University, Chung-Li 32001, TaiwanDepartment of Mechanical Engineering, Ashesi University, Cantonments, Accra PMB CT3, GhanaOne of the worst haze events to ever hit Peninsular Malaysia occurred in June 2013 due to smoke from Riau, Central Sumatra. While biomass-burning in the region is common, the early occurrence of a haze episode of this magnitude was uncharacteristic of the seasonality of extreme fire events, which usually occur between August and October in the Maritime Continent (MC). This study aims to investigate the phenomenology of the June 2013 haze event and its underlying meteorological forcing agents. The aerosol and meteorological environment during the event is examined using the Moderate Resolution Imaging Spectroradiometer (MODIS) active fire hotspot detections and aerosol optical thickness retrievals, satellite-based precipitation retrievals, and meteorological indices. These datasets are then supported by a WRF-Chem simulation to provide a comprehensive picture of the event’s meteorology and aerosol transport phenomenology. While extreme fire events are more characteristic of El Nino years, the MODIS fire count over the MC in June for the years 2001−2015 was highest in 2013 when neutral El Nino/Southern Oscillation (ENSO) conditions prevailed. Although, the mean daily precipitation for June 2013 was below average for June 2003−2015. An early active tropical cyclone (TC) season occurred in 2013, and results show that the combined induced subsidence and flow enhancement due to TC Bebinca and the dry phases of a strong Madden−Julian Oscillation (MJO) event contributed to the event intensification. Results also show that Bebinca induced a decrease in surface relative humidity of at least 10% over Riau, where fire hotspots were concentrated.https://www.mdpi.com/2073-4433/11/1/55wrf-chembiomass burning hazemaritime continenttropical cyclonemjoenso |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yaasiin Oozeer Andy Chan Jun Wang Jeffrey S. Reid Santo V. Salinas Maggie C. G. Ooi Kenobi I. Morris |
spellingShingle |
Yaasiin Oozeer Andy Chan Jun Wang Jeffrey S. Reid Santo V. Salinas Maggie C. G. Ooi Kenobi I. Morris The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity Atmosphere wrf-chem biomass burning haze maritime continent tropical cyclone mjo enso |
author_facet |
Yaasiin Oozeer Andy Chan Jun Wang Jeffrey S. Reid Santo V. Salinas Maggie C. G. Ooi Kenobi I. Morris |
author_sort |
Yaasiin Oozeer |
title |
The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity |
title_short |
The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity |
title_full |
The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity |
title_fullStr |
The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity |
title_full_unstemmed |
The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity |
title_sort |
uncharacteristic occurrence of the june 2013 biomass-burning haze event in southeast asia: effects of the madden-julian oscillation and tropical cyclone activity |
publisher |
MDPI AG |
series |
Atmosphere |
issn |
2073-4433 |
publishDate |
2020-01-01 |
description |
One of the worst haze events to ever hit Peninsular Malaysia occurred in June 2013 due to smoke from Riau, Central Sumatra. While biomass-burning in the region is common, the early occurrence of a haze episode of this magnitude was uncharacteristic of the seasonality of extreme fire events, which usually occur between August and October in the Maritime Continent (MC). This study aims to investigate the phenomenology of the June 2013 haze event and its underlying meteorological forcing agents. The aerosol and meteorological environment during the event is examined using the Moderate Resolution Imaging Spectroradiometer (MODIS) active fire hotspot detections and aerosol optical thickness retrievals, satellite-based precipitation retrievals, and meteorological indices. These datasets are then supported by a WRF-Chem simulation to provide a comprehensive picture of the event’s meteorology and aerosol transport phenomenology. While extreme fire events are more characteristic of El Nino years, the MODIS fire count over the MC in June for the years 2001−2015 was highest in 2013 when neutral El Nino/Southern Oscillation (ENSO) conditions prevailed. Although, the mean daily precipitation for June 2013 was below average for June 2003−2015. An early active tropical cyclone (TC) season occurred in 2013, and results show that the combined induced subsidence and flow enhancement due to TC Bebinca and the dry phases of a strong Madden−Julian Oscillation (MJO) event contributed to the event intensification. Results also show that Bebinca induced a decrease in surface relative humidity of at least 10% over Riau, where fire hotspots were concentrated. |
topic |
wrf-chem biomass burning haze maritime continent tropical cyclone mjo enso |
url |
https://www.mdpi.com/2073-4433/11/1/55 |
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