Linear Fit SO2 Retrieval Algorithm with TOMS V8 Total O3
Kai Yang UMCP Simon Carn MTU
STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP May 14, 2014
Eyja%allajokull April 15, 2010
Outline • Algorithm Basis • V8 Total O3 and Linear Fit (LF) SO2 Retrieval • SO2 Retrieval SensiIvity • LimitaIon and MiIgaIon • Radiance Residual CorrecIon • OMPS LF SO2
• Unexpected achievements from OMPS
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
O3 and SO2 Absorptions in UV
310 320 330 340 350 36002468101214310 320 330 340 350 360
02468101214
l HnmL
aHatm-cmL-1
r
O3SO2r
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
ρ=αso2/αo3
Arrows indicate wavelengths used in the TV8 ozone algorithm
@ 317.62 nm 1 DU SO2 -‐> ~ 2 DU O3 Error
Basic idea: MinimizaIon between measured (Iobs) and modeled (I) radiance measurements.
Algorithm Steps: • LinearizaIon: TOMS V8 total O3, reflecIvity, climatology cloud pressure, no SO2
• Linear equaIons: each for one spectral band (λ)
• Least square fit of weighIng funcIons: determine adjustments to ozone (Ω) , SO2 (Ξ), surface reflecIvity (R) or cloud fracIon (fc), and AI (c1).
Linear Fit SO2 Algorithm
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
ln Iobs − ln I = ΔΩ∂ ln I∂Ω
+ΔΞ∂ ln I∂Ξ
+ ΔR+ cii=1
N
∑ (λ −λ0 )i
'
()
*
+,∂ ln I∂R
+ε
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0 20 40 60 80 100 120
-600-500-400-300-200-100
00 20 40 60 80 100 120
-600-500-400-300-200-1000
XL HDUL
DWHDUL
y=0.365-2.002*x-0.025*x2
O3 adjustments vs. LF SO2
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
LF Sample Results: OMI Soufriere Hills Volcano 05/21/2006
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
LF Sample Results: OMI Nyamulagira Volcano 11/28/2006
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
SO2 Retrieval SensiIvity: LF Averaging Kernels
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
0.4 0.6 0.8 1 1.2A!
1000
500
250
100
50
25
10
5
2.5
1
Pressure!hPa
"
0.4 0.6 0.8 1 1.2
0
5
10
15
20
25
30
35
40
45
50
Altitude!km"
Three LF products: • Lower Troposphere (TRL) : 0 – 5 km, polluIon and volcanic degassing SO2
• Middle Troposphere (TRM) : 5 – 10 km, volcanic degassing and erupIon SO2
• Lower stratosphere (STL) : 15 – 20 km, volcanic erupIon SO2
TRM STL
LimitaIon • Non-‐linear effect leads to LF underesImaIon of large SO2 columns ( > 100 DU)
MiIgaIon • Use only longer wavelengths (>= 315 nm, weaker absorpIon) for LF SO2 retrieval
• Use improved algorithm: IteraIve Spectral Fikng
LimitaIon and MiIgaIon
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
LF Retrieval are severely impacted by systemaIc errors: • AddiIve radiance errors, ozone retrieval error, forward model error, etc …
Radiance residuals errors are corrected for LF Retrieval • Each cross-‐track posiIon has its own correcIon • Full orbit data: sliding median • ParIal orbit data: laItude-‐band (~10°, smaller is OK) average
Radiance Residual CorrecIon
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
S-‐NPP OMPS LF SO2: Copahue (Chile & ArgenIna), Dec 2012
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
S-‐NPP OMPS LF SO2: Copahue (Chile & ArgenIna), Dec 2012
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
Unexpected results from OMPS Achieved with Algorithm Advances
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
Unprecedented SO2 Sensitivity
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
-0.03
-0.02
-0.01
0.01
0.02
0.03
SO2 (DU)
October 2013 Monthly Mean ISF Algorithm
ISF sensiIvity is an order of magnitude higher than other exisIng algorithms for boundary layer retrievals:
20 to 30 Imes > BRD 5 to 10 Imes > PCA 5 to 10 Imes > LF
Daily Global Pollution Monitoring with OMPS
K. Yang STAR JPSS Review Session 5e, Ozone EDR Science Breakout Session, NOAA NCWCP, May 14, 2014
SO2 (DU)
UV AIb
NO2 (1015 cm-‐2)
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