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Air Parcel Transport Over the Maritime Continent as Determined
from Trajectory Climatologies, 1994-1999
Alan Wain
Monash University - School of Geography and Environmental Science, 2002
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Book description
The episodes of haze periodically experienced by the ASEAN countries,
in particular Singapore and Malaysia, are good examples of transboundary
air pollution. In these events, pollutants from outside source(s) impact
upon air quality, health and economy over a wide area. One widely used
method for studying the movement of air borne pollutants is the air parcel
trajectory model. This monograph utilises the HYSPLIT-4 air parcel trajectory
model in the production of climatologies of 168 hour backward trajectories
from nine cities throughout the maritime continent. The trajectory model
is validated using observations made during the ASEAN haze episodes of
1994 and 1997-98. In order to discern possible sources of pollutants
which may be carried to the regional cities, daily backward trajectories
were calculated from each of the nine cities over the period from June
1994 to May 1999. These are presented in both raw form and as average
cluster trajectories, produced after the application of a clustering
routine to the raw data. The patterns and variations in trajectories
from each city are identified and discussed for each month. Forward trajectories
from 30 source points, spread on a grid over the maritime continent were
calculated to provide information about latitudinal and longitudinal
variation in transport patterns. Results obtained show the HYSPLIT trajectories
represent expected flow patterns quite well. The existence of significant
transport to regional cities from a number of potential pollution sources
was identified, as were distinct patterns in regional airflow. The potential
capacity for Australia and Indonesia to exchange aerosols was found to
be significant but the transport in reality is restricted by processes
of removal and dispersion. [GES, Monash University]
About the author
Alan Wain is a postgraduate student in the School of Geography
and Environmental Science at Monash University.
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