1. DREAM dust forecast: case December 22nd 2009
impact of different model resolutions on dust event forecast quality
Terra MODIS Dec 22nd 2009 ~20UTC
Aqua MODIS (IR difference)
Dec 22nd 2009 ~20UTC

2. dust masks used: mcd12 (updated on 15days)
50km
17km
7km

3. model start Dec22nd 2009 00UTC (warm start)
DREAM 50km
+24h
+33h

4. DREAM 17km
+24h
+33h

5. DREAM 7km
+24h
+33h

6. DREAM 7km vs. pm10 measurements

7. problem with observations
AERONET insufficient measurement stations, frequent interruptions
PM measurements contaminated with pollution

8. PREFERENTIAL DUST SOURCES
Ginoux et al – “preferential dust source” idea
N. Africa – Europe - SW Asia GX
Ginoux (GX):
low resolution,
10x10 degrees box,
S + bare surface from AVHRR
(1x1 degrees) HR
High resolution (HR):
1km resolution,
2.5x2.5 degrees box,
just S function
Engelstaedter
and Wasington (2007)

9. S. Africa
Australia GX GX HR HR

10. N. America
S. America GX GX HR HR

11. Idea for better dust mask: to combine both information
MODIS mcd12 mask:
bare soil + change of agricultural
regions
High resolution S-function
threshold ???