Validation of OMI tropospheric NO2 observations during INTEX-B ...
Evidence of North American CO 2 sources and sinks from regional observations during INTEX-A
18
Evidence of North American CO 2 sources and sinks from regional observations during INTEX-A S. Vay, Y. Choi, J.-H. Woo, K. Prasad, R. Washenfelder, P. Wennberg, S. Nolf, A. Aknan, J. Barrick, S. Branham, C. Hudgins, J. Plant
description
Evidence of North American CO 2 sources and sinks from regional observations during INTEX-A. S. Vay, Y. Choi, J.-H. Woo, K. Prasad, R. Washenfelder, P. Wennberg, S. Nolf, A. Aknan, J. Barrick, S. Branham, C. Hudgins, J. Plant. DC-8 (2004/07/20). - PowerPoint PPT Presentation
Transcript of Evidence of North American CO 2 sources and sinks from regional observations during INTEX-A
Evidence of North American CO2 sources and sinks from regional observations during INTEX-A
S. Vay, Y. Choi, J.-H. Woo, K. Prasad, R. Washenfelder, P. Wennberg, S. Nolf, A. Aknan, J. Barrick,
S. Branham, C. Hudgins, J. Plant
DC-8 (2004/07/20)High CO2 (> 1Std) Long-range transport?
Low CO2 (< 1Std)Uptake from vegetation?
A narrow point source plume was captured by high resolution CO2 sensor (403.15 ppm CO2 @ 1Hz)
The white bar : Point sources extruded by July CO2 emission
CO2 ANALYSIS AT LEVEL 1 CLASSES (AG. vs NON-AG)
Flight path overlay on LANDSAT map and Aircraft based CO2 data aggregated at 7.5 minute Quadrangles for LEVEL 1 classes.
#Y
#Y #Y
#Y
#Y #Y #Y#Y
#Y #Y #Y #Y
#Y #Y #Y
#Y #Y #Y #Y
#Y
#Y
#Y
#Y
#Y
#Y
#Y#Y
#Y
#Y#Y
#Y
#Y
#Y
#Y
#Y
#Y
#Y
#Y
#Y
N
EW
S
Land cover classesAgricultureCloudsPastureUnclassifiedUrbanWaterWetlandsWoods
339 ppm CO2
80 0 80 160 240 320 400 480 560 Miles
CO2 ANALYSIS AT LEVEL II CLASSES
Flight path overlay and Aircraft based CO2 data aggregated at 7.5 minute Quadrangles for LEVEL II classes.
N
Land cover classesAlfalfaCloudsCornCottonDouble crop WW/SoybeansOatsOther cropsOther small grains / hayPasturePasture/ Grass / Non-AgPasture/Grassland/Non-AgPotatoesPumpkinsRiceSnap beansSorghumSoybeansUnclassifiedUrbanWaterWetlandsWinter WheatWoods
339 ppm CO2
MODIS_NDVI-0.25 - -0.125-0.125 - 00 - 0.1250.125 - 0.250.25 - 0.3750.375 - 0.50.5 - 0.6250.625 - 0.750.75 - 0.8750.875 - 1No Data
3000 0 3000 6000 MilesN
RELATING MODIS_NDVI DATA (7/04) TO CO2 VMR
MODIS_NDVI-0.25 - -0.125-0.125 - 00 - 0.1250.125 - 0.250.25 - 0.3750.375 - 0.50.5 - 0.6250.625 - 0.750.75 - 0.8750.875 - 1No Data
Illinois
900 0 900 1800 Miles
N
EW
S
MODIS_NDVI-0.25 - -0.125-0.125 - 00 - 0.1250.125 - 0.250.25 - 0.3750.375 - 0.50.5 - 0.6250.625 - 0.750.75 - 0.8750.875 - 1No Data
3000 0 3000 6000 MilesN
Calibration of Absolute Column CO2 Using Aircraft Data
Intercontinental Chemical Transport Experiment – North America (INTEX-NA)• NASA DC-8 and King Air measured in situ CO2 during tower profiles• Eight unique aircraft profiles:
DC-8: July 12, July 15 (twice)King Air: July 14, July 15, August 14, August 15 (twice)
Allows us to place our column CO2 retrievals on the same scale as the in situ network.
DC-8 Flight Path and Photograph from 12 July:
46.4
46.2
46.0
45.8
45.6
La
titu
de
(d
eg
)
-91.0 -90.8 -90.6 -90.4 -90.2 -90.0Longitude (deg)
Color = Altitude from 0 - 12 km
15 km
FTS Column and Aircraft In Situ Data – 12 July 04
Aircraft Column / Total Dry Column =373.11 ± 0.52 ppmv
FTS Column / Total Dry Column = 376.07 ± 0.24 ppmv
AIRCRAFT PROFILE: FTS RETRIEVAL:
800
600
400
200
0
Pre
ssur
e (m
b)
390380370360350
CO2 VMR (ppmv)
Median PBL
Median Free Troposphere
Sept 2004 Balloon Profile(Daube and Wofsy)
In Situ CO2 (Vay)
380
375
370
365
CO
2 V
MR
(p
pm
v)
10:30 11:00 11:30 12:00 12:30
Local Time (CDT)
Time of Aircraft Profile
Comparison of FTS Column and Integrated Aircraft CO2
380
375
370
365
FT
S C
olum
n / D
ry C
olum
n (p
pmv)
380375370365
Integrated Aircraft Column / Dry Column (ppmv)
DC-8 King Air One to one line Linear Fit with Intercept=0
FTS Column = 1.0068 x Aircraft Column
• OCO – S. Denning (CSU); H. Boesch (JPL)
• AIRS – C. Crevoisier (LSCE); M. Chahine (JPL)
• SCIAMACHY – M. Buchwitz (U. Bremen); I. Aben (SRON)
