Geoscience Reference
In-Depth Information
Table 20.1
Examples of satellite-derived dust data sets.
Temporal resolution
and time of passing
if daily
Spatial
resolution
Reference of use
in dust research
Platform
Years available
Features/problems
1.25
◦
×
1.0
◦
TOMS AI
(Nimbus 7)
Once a day, around
noon
1978-1993
Detects aerosols over
land but not below
1 km, height
dependency
Herman
et al.
(1997)
TOMS AI (EP)
1.25
◦
×
1.0
◦
Once a day, around
noon
1996-2005, has
problems in
some years
Detects aerosols over
land but not below
1 km, height
dependency
TOMS AI (OMI)
1.0
◦
×
1.0
◦
Once a day, around
noon
2004-present
Detects aerosols over
land but not below
1 km, height
dependency
Levelt (2002)
MISR
250
×
250 m
Global coverage every
9 days, with repeat
coverage between 2
and 9 days
depending on
latitude
2000-present
Martonchik
et al.
(1998, 2002)
SEVIRI (dust
images)
3kmatnadir
Every15minutes,
geostationary
2006-present
Detects aerosols over
land, also at night,
height dependency
Schepanski
et al.
(2007)
SEVIRI (DSAF)
a
1.0
◦
×
1.0
◦
8 times a day (3 hour
periods),
geostationary
2006-present
Day and night, height
dependency
Schepanski
et al.
(2007)
MODIS (deep
blue)
250-1000 m
Once a day (Aqua),
2002-present
Hsu
et al.
(2004)
SeaWiFS (deep
blue)
4 km
Once a day, sun
synchronous at
705 km
1998-present
Hsu
et al.
(2004)
Meteosat (IDDI)
1.0
◦
×
1.0
◦
Once a day, about
11:30 UTC, product
is monthly,
geostationary
1984-present
Detects aerosols over
land, height
dependency
Brooks and
Legrand (2000)
Various satellites
(AOT as
indicator of
dust)
Varying
Varying
Varying,
<
daily
Based on visible WL,
difficulties over
bright surfaces
(deserts)
a
Dust source activation frequency.
Ground-based subjective visibility records, which were
the mainstay of inferred dust loadings prior to the mid
1990s, continue to be made at synoptic weather stations.
In many stations, automatic visibility sensors are replac-
ing observer-judged visibility. However, it remains the
case that there are very few ground-based data of dust
emission, flux and deposition from the vast majority of the
has featured several field campaigns in North Africa fo-
cused on dust measurement.
20.1.2.4
Miami Aerosol Group measurements
A
worldwide
array
of
near-surface
oceanic
aerosol
sampling set up by the University of Miami Aerosol
