On the use of multi-angle, multi-spectral, photo-polarimetric remote sensing data to constrain aeros...
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On the use of multi-angle, multi-spectral, photo-polarimetric remote sensing data to constrain aerosol properties. Jacek Chowdhary 1,2 , Brian Cairns 1,2 , Michael Mishchenko 2. 1 Columbia University, 2 NASA/Goddard Institute of Space Studies. In 9 spectral bands from l = 412 to 2250 nm.

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Jacek Chowdhary 1,2 , Brian Cairns 1,2 , Michael Mishchenko 2

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Jacek chowdhary 1 2 brian cairns 1 2 michael mishchenko 2

On the use of multi-angle, multi-spectral, photo-polarimetric remote sensing data to constrain aerosol properties

Jacek Chowdhary1,2, Brian Cairns1,2, Michael Mishchenko2

1 Columbia University, 2 NASA/Goddard Institute of Space Studies


Jacek chowdhary 1 2 brian cairns 1 2 michael mishchenko 2

In 9 spectral bands from l = 412 to 2250 nm

(412, 443, 555, 672, 865, 910, 1378, 1610, & 2250 nm)

glint

{ R}

1.

sun glint:

profile

Radiative closure experiment involving data from 6 research aircrafts,

2250

Im(m) est.

several land sites, an ocean platform, and MISR & MODIS

Re(m), SD,

{ P}

{ P}

2.

to

fine aerosol, ocean:

or

670

410

ocean est.

3.

fine & coarse aerosol:

{ R, P}

{ R, P}

to

Re(m), SD

2250

865

4.

{ R }

{ R}

to

fine aerosol, ocean:

Im(m), ocean

670

410

Data sets and analyses

  • MISR

Obtains I, Q, & U simultaneously, DDoLP< 0.2%

~ POLDER capability to obtain I, Q, U

  • POLDER

  • APS

  • AVHRR

~ MISR capability to obtain many views

Views 240 angles covering +60°/–70° from nadir

~ MODIS capability to monitor many l

  • MODIS

Quantity

CLAMS data

properties

J. Atm. Sci. (2005), 1093-1117


Jacek chowdhary 1 2 brian cairns 1 2 michael mishchenko 2

In 9 spectral bands from l = 412 to 2250 nm

(412, 443, 555, 672, 865, 910, 1378, 1610, & 2250 nm)

I

where

Re(m) = 1.50 (410 nm)

I = intensity

re = .15 mm,

DoLP = degree of linear polarization

Im(m) = 0.02

ve = .2,

e=eI

eI

where

= uncertainty in I = 3.5%

eDoLP

glint

= uncertainty in DoLP = (0.002)/(DoLP)

{ R}

1.

sun glint:

profile

2250

Im(m) est.

Re(m), SD,

{ P}

{ P}

2.

to

fine aerosol, ocean:

or

670

410

ocean est.

sun

3.

fine & coarse aerosol:

{ R, P}

{ R, P}

to

Re(m), SD

back

sun

back

sun

2250

865

total reflectance

total reflectance

total reflectance

back

4.

{ R }

{ R}

to

fine aerosol, ocean:

Im(m), ocean

670

410

viewing zenith angle

viewing zenith angle

viewing zenith angle

Data sets and analyses

  • MISR

Obtains I, Q, & U simultaneously, DDoLP< 0.2%

  • POLDER

  • APS

  • AVHRR

Views 240 angles covering +60°/–70° from nadir

  • MODIS

Data set:

P =I × DoLP

Quantity

CLAMS data

properties

e=eI+eDoLP

Error bars:

DDoLP~ 1%

no P in VIS

MISR angles

polarized reflectance

polarized reflectance

polarized reflectance

J. Atm. Sci. (2005), 1093-1117

viewing zenith angle

viewing zenith angle

viewing zenith angle


Jacek chowdhary 1 2 brian cairns 1 2 michael mishchenko 2

To accurately constrain aerosol properties requires polarization data for

a large number of viewing angles & wavelengths with DDoLP≤ 0.2%

Limiting any of these requirements in e.g. the VIS significantly reduces

Such limitations also significantly affect the ability to retrieve ocean

the capability to identify the composition of fine mode aerosol particles

color variations from total reflectance data

Conclusions


Jacek chowdhary 1 2 brian cairns 1 2 michael mishchenko 2

sun

back

D-P mix

D-P mix

0.03 mg/m3

0.10 mg/m3

relatively small

sun:

0.30 mg/m3

1.00 mg/m3

j-j0 = 0º

j-j0 = 180º

3.00 mg/m3

back:

inherently small

a (Chl,l)

b (Chl,l)

q (Chl,l)

Semi-analytical

Total

Polarized

Data

[Chl]

l

RT results

underwater light irradiance ratio

RT results

In situ polarimetry

Ratio

F11(cos q)

F21(cos q)

P (cos q)

wavelength (nm)

Underwater light scattering

Special case retrieval

ocean RT model

RSP data (CLAMS)

RT computations

polarized reflectance

Mie

scattering function

RT

degree linear polarization (%)

F (cos q)

w

hydrosol SD

hydrosol m

R (view, Chl, l)

R (view)

410 nm

viewing zenith angle

scattering angle Q (deg)

scattering angle Q (deg)

Re(m) = 1.46

re = 0.15 mm

Im(m) = .015

ve = 0.2

Chowdhary et al. (2006)

Chowdhary et al. (2005)


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