J31 Data Workshop 9-10Mar05

Validation of Satellite Aerosol Optical Depth by AATS-14

during ICARTT 2004

NASA Ames Airborne Sunphotometer Team

Presented by John Livingston

SRI International

Jetstream-31 (J31) in INTEX-ITCT

DATE Satellite Overflight Time lower left corner upper right corner comments UT [hhmm] lat N, lon W [decimal deg] lat N, lon W [decimal deg] MODIS MISR

12-Jul Aqua 1813 42.95, 69.9 43.1, 69.0 yes15-Jul Aqua 1705 43.1, 69.9 43.2, 69.3 no16-Jul Aqua 1748 42.4, 69.0 43.0, 68.0 yes17-Jul Terra 1513 42.7, 70.7 43.25, 70.0 MISR Path 7; too far east of J31 track yes no20-Jul Terra 1543 43.05, 69.8 43.3, 69.4 MISR local mode; MODIS unusable yes/bad yes21-Jul Aqua 1806 43.0, 70.5 43.6, 69.5 yes22-Jul Terra 1531 42.4, 70.2 43.1, 69.4 MISR local mode yes yes23-Jul Aqua 1754 42.6, 70.2 43.1, 69.95 yes29-Jul Terra 1537 42.5,70.5 43.3 69.5 MISR local mode; MODIS unusable yes/bad yes29-Jul Aqua 1718 42.5,70.5 43.3 69.5 MODIS unusable yes/bad31-Jul Terra 1525 no MISR; limited AATS data at low alt no no31-Jul Aqua 1705 cirrus no2-Aug Terra 1513 42.3, 70.5 43.2, 69.2 MISR Path 7; too far east of J31 track yes no7-Aug Terra 1531 41.6, 68.75 42.8, 67.5 MISR (but no LM); MODIS unusable yes/bad yes8-Aug Aqua 1754 42.65, 70.25 42.85, 67.75 yes

analysis status

Table of J31/satellite coincidences during ITCT 2004

ICARTT 2004 AATS-14/MODIS Coincidences

• Eight cases w/MODIS data

• July 12, 16, 17, 21, 22, 23; August 2, 8

ICARTT 2004 AATS-14/MISR Coincidences

• Four events

• July 20, 22, 29; August 7

MISR 20 July

• Moderate AODs

• Limited MISR data

J31 descent

J31 ascent

Terra overpass: 1543 UT

Note: V16 MISR AODs > 0 are available only within blue boxshown in earlier slide. These AATS-14 data are means for allAATS data points shown in previous slide.

MISR V16

Note: These AATS-14 means only include those data points within the MISR blue box, as shown in earlier slide.

MISR V16

J31 descent

J31 ascent

MISR 29 July

• Moderate/large AODs

• AOD gradient

J31 ascent

J31 descent

Terra overpass: 1537 UT

AOD gradient (AATS)

MISR V15

MISR V16

J31 ascent

J31 descent

MISR 7 Aug

• Small AODs

• AOD gradient

• DC-8 rendezvous

J31 ascent

Terra overpass: 1531 UT

small AO

D gradient (AATS)

MISR V15

MISR V16

MISR 22 July

• Moderate/large AODs

• small AOD gradient along J31 flight trackbut outside of MISR grid cell locations

J31 ascent

J31 descent

MISR grids

Terra overpass: 1531 UT

small AOD gradient (AATS)

MISR V15

MISR V16

22 July: AATS/MISR/MODIS

small AO

D gradient (AATS)

MODIS

ICARTT 2004 AATS-14/MODIS Coincidences

• Eight cases w/MODIS data

• July 12, 16, 17, 21, 22, 23; August 2, 8

• MISR data also available for 22 July case

MODIS 12 July

• Moderate AODs

• AOD gradient along portion of J31 track

flight direction

J31 descent

J31 ascent

AOD gradient (AATS)

MODIS 16 July

• Moderate AODs

• Limited AATS retrievals

MODIS 17 July

• Small AODs

• Limited near surface AATS AOD retrievals

MODIS 21 July

• Moderate AODs

• AOD gradient along portion of J31 track

flight direction

J31 descent

J31 ascent

AO

D g

radi

ent (

AA

TS)

MODIS 23 July

• AOD gradient

• Large maximum AODs

flight direction

AOD gradient (AATS)

MODIS 2 Aug

• Large AOD gradient

• Moderate maximum AODs

flight direction

J31 descent

AOD gradient (AATS)

flight direction

MODIS 8 Aug

• J31 short longitudinal transect

• Small AODs

• AOD gradient near eastern end of track