Mesoscale equatorial wind prediction in Southeast Asia during a haze episode of 2005

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Even today fires are still utilized by local farmers in Southeast Asia to clear land. Air pollutants produced from the biomass burning activities from Sumatera, for example, are advected towards the western coast of Peninsular Malaysia during the southwest monsoon and can cause adverse effects on the health of the local population. This study utilized the TAPM (The Air Pollution Model) to predict the low level mesoscale characteristics in an equatorial environment that encompassed the island of Sumatera and Peninsular Malaysia during the burning period in August 2005, when persistent haze was prevalent. TAPM was able to generate the existence of the daily land and sea breeze conditions near the western coast of the Peninsular Malaysia with relative success with a moderately high Index of Agreement of 0.87 and 0.60 for the zonal and meridional wind components, respectively, even without assimilation of local wind conditions. Strong low level southwesterlies that were generated during the daytime over the Straits of Malacca were associated with sea breeze, while weak southeasterlies simulated from 1900 local time towards midnight were associated with land breeze conditions. The vertical wind profile within the lowest kilometer of the atmosphere showed that the weak southwesterlies were present from mid-morning to sunset, which was interspersed with stronger southwesterlies that generally occurred above the height of 400 m. The meteorological parameters such as wind speed, temperature, and humidity were successfully simulated by the model with comparatively high correlation coefficients, low RMSEs and high indices of agreement with observed values. The vertical turbulent kinetic energy profiles showed presence of low level suppression at a height below 600 m during the height of the haze in August 2005, which coincided with the intense burning activities in Sumatera and the elevated levels of pollution in western Peninsular Malaysia. Trajectory analysis showed that aged air particles were advected landwards and seawards throughout the duration of the seven days' simulation from the 7th to the 13th of August 2005. The presence of recirculation features of the land and sea breeze conditions highlighted the poor transportation capability of low level winds that were unable to cope with the high loadings of aerosols from the biomass burning in Sumatera.

Original languageEnglish
Pages (from-to)67-84
Number of pages18
JournalGeofizika
Volume26
Issue number1
Publication statusPublished - Jun 2009

Fingerprint

Southeast Asia
land breeze
haze
sea breeze
Malaysia
biomass burning
atmospheric pollution
prediction
predictions
air pollution
coasts
wind profile
coast
kinetic energy
strait
humidity
trajectory analysis
monsoon
wind profiles
meteorological parameters

Keywords

  • Biomass burning
  • Equatorial region
  • Meteorological parameters
  • Southeast Asia
  • Transportation of haze

ASJC Scopus subject areas

  • Geophysics

Cite this

Mesoscale equatorial wind prediction in Southeast Asia during a haze episode of 2005. / Mahmud, Mastura.

In: Geofizika, Vol. 26, No. 1, 06.2009, p. 67-84.

Research output: Contribution to journalArticle

@article{21d314ce2c8343b4906dbca80157875b,
title = "Mesoscale equatorial wind prediction in Southeast Asia during a haze episode of 2005",
abstract = "Even today fires are still utilized by local farmers in Southeast Asia to clear land. Air pollutants produced from the biomass burning activities from Sumatera, for example, are advected towards the western coast of Peninsular Malaysia during the southwest monsoon and can cause adverse effects on the health of the local population. This study utilized the TAPM (The Air Pollution Model) to predict the low level mesoscale characteristics in an equatorial environment that encompassed the island of Sumatera and Peninsular Malaysia during the burning period in August 2005, when persistent haze was prevalent. TAPM was able to generate the existence of the daily land and sea breeze conditions near the western coast of the Peninsular Malaysia with relative success with a moderately high Index of Agreement of 0.87 and 0.60 for the zonal and meridional wind components, respectively, even without assimilation of local wind conditions. Strong low level southwesterlies that were generated during the daytime over the Straits of Malacca were associated with sea breeze, while weak southeasterlies simulated from 1900 local time towards midnight were associated with land breeze conditions. The vertical wind profile within the lowest kilometer of the atmosphere showed that the weak southwesterlies were present from mid-morning to sunset, which was interspersed with stronger southwesterlies that generally occurred above the height of 400 m. The meteorological parameters such as wind speed, temperature, and humidity were successfully simulated by the model with comparatively high correlation coefficients, low RMSEs and high indices of agreement with observed values. The vertical turbulent kinetic energy profiles showed presence of low level suppression at a height below 600 m during the height of the haze in August 2005, which coincided with the intense burning activities in Sumatera and the elevated levels of pollution in western Peninsular Malaysia. Trajectory analysis showed that aged air particles were advected landwards and seawards throughout the duration of the seven days' simulation from the 7th to the 13th of August 2005. The presence of recirculation features of the land and sea breeze conditions highlighted the poor transportation capability of low level winds that were unable to cope with the high loadings of aerosols from the biomass burning in Sumatera.",
keywords = "Biomass burning, Equatorial region, Meteorological parameters, Southeast Asia, Transportation of haze",
author = "Mastura Mahmud",
year = "2009",
month = "6",
language = "English",
volume = "26",
pages = "67--84",
journal = "Geofizika",
issn = "0352-3659",
publisher = "Geofizicki Zavod",
number = "1",

}

TY - JOUR

T1 - Mesoscale equatorial wind prediction in Southeast Asia during a haze episode of 2005

AU - Mahmud, Mastura

PY - 2009/6

Y1 - 2009/6

N2 - Even today fires are still utilized by local farmers in Southeast Asia to clear land. Air pollutants produced from the biomass burning activities from Sumatera, for example, are advected towards the western coast of Peninsular Malaysia during the southwest monsoon and can cause adverse effects on the health of the local population. This study utilized the TAPM (The Air Pollution Model) to predict the low level mesoscale characteristics in an equatorial environment that encompassed the island of Sumatera and Peninsular Malaysia during the burning period in August 2005, when persistent haze was prevalent. TAPM was able to generate the existence of the daily land and sea breeze conditions near the western coast of the Peninsular Malaysia with relative success with a moderately high Index of Agreement of 0.87 and 0.60 for the zonal and meridional wind components, respectively, even without assimilation of local wind conditions. Strong low level southwesterlies that were generated during the daytime over the Straits of Malacca were associated with sea breeze, while weak southeasterlies simulated from 1900 local time towards midnight were associated with land breeze conditions. The vertical wind profile within the lowest kilometer of the atmosphere showed that the weak southwesterlies were present from mid-morning to sunset, which was interspersed with stronger southwesterlies that generally occurred above the height of 400 m. The meteorological parameters such as wind speed, temperature, and humidity were successfully simulated by the model with comparatively high correlation coefficients, low RMSEs and high indices of agreement with observed values. The vertical turbulent kinetic energy profiles showed presence of low level suppression at a height below 600 m during the height of the haze in August 2005, which coincided with the intense burning activities in Sumatera and the elevated levels of pollution in western Peninsular Malaysia. Trajectory analysis showed that aged air particles were advected landwards and seawards throughout the duration of the seven days' simulation from the 7th to the 13th of August 2005. The presence of recirculation features of the land and sea breeze conditions highlighted the poor transportation capability of low level winds that were unable to cope with the high loadings of aerosols from the biomass burning in Sumatera.

AB - Even today fires are still utilized by local farmers in Southeast Asia to clear land. Air pollutants produced from the biomass burning activities from Sumatera, for example, are advected towards the western coast of Peninsular Malaysia during the southwest monsoon and can cause adverse effects on the health of the local population. This study utilized the TAPM (The Air Pollution Model) to predict the low level mesoscale characteristics in an equatorial environment that encompassed the island of Sumatera and Peninsular Malaysia during the burning period in August 2005, when persistent haze was prevalent. TAPM was able to generate the existence of the daily land and sea breeze conditions near the western coast of the Peninsular Malaysia with relative success with a moderately high Index of Agreement of 0.87 and 0.60 for the zonal and meridional wind components, respectively, even without assimilation of local wind conditions. Strong low level southwesterlies that were generated during the daytime over the Straits of Malacca were associated with sea breeze, while weak southeasterlies simulated from 1900 local time towards midnight were associated with land breeze conditions. The vertical wind profile within the lowest kilometer of the atmosphere showed that the weak southwesterlies were present from mid-morning to sunset, which was interspersed with stronger southwesterlies that generally occurred above the height of 400 m. The meteorological parameters such as wind speed, temperature, and humidity were successfully simulated by the model with comparatively high correlation coefficients, low RMSEs and high indices of agreement with observed values. The vertical turbulent kinetic energy profiles showed presence of low level suppression at a height below 600 m during the height of the haze in August 2005, which coincided with the intense burning activities in Sumatera and the elevated levels of pollution in western Peninsular Malaysia. Trajectory analysis showed that aged air particles were advected landwards and seawards throughout the duration of the seven days' simulation from the 7th to the 13th of August 2005. The presence of recirculation features of the land and sea breeze conditions highlighted the poor transportation capability of low level winds that were unable to cope with the high loadings of aerosols from the biomass burning in Sumatera.

KW - Biomass burning

KW - Equatorial region

KW - Meteorological parameters

KW - Southeast Asia

KW - Transportation of haze

UR - http://www.scopus.com/inward/record.url?scp=70349906532&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70349906532&partnerID=8YFLogxK

M3 - Article

VL - 26

SP - 67

EP - 84

JO - Geofizika

JF - Geofizika

SN - 0352-3659

IS - 1

ER -