linear fit so2 retrieval algorithm with toms v8 total o · soufrierehills*volcano**05/21/2006 *...

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


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


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


LF Sample Results: OMI Soufriere Hills Volcano 05/21/2006


LF Sample Results: OMI Nyamulagira Volcano 11/28/2006


SO2 Retrieval SensiIvity: LF Averaging Kernels


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


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


S-‐NPP OMPS LF SO2: Copahue (Chile & ArgenIna), Dec 2012


Unexpected results from OMPS Achieved with Algorithm Advances


Unprecedented SO2 Sensitivity


-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


SO2 (DU)

UV AIb

NO2 (1015 cm-‐2)

linear fit so2 retrieval algorithm with toms v8 total o · *soufriere*hills*volcano**05/21/2006 *...

Documents

linear fit so2 retrieval algorithm with toms v8 total o · soufrierehills*volcano**05/21/2006 *...