ADIENT WP3.2 ADIENT WP3.2 ‘Observational determination of the impact of anthropogenic pollution aerosol on the TOA radiation budget and its sensitivity to the

aerosol properties’

Alexandros P. Georgiadis & Helen E. Brindley

Aims/Approach Aims/Approach

Assessing the Radiative Impact of anthropogenic pollution aerosol on the TOA radiation budget

Satellite derived: ττ & reflected SWFSWF

brdbnd Rad. / mult. CHN IMG

SWSWLL↑↑

(CERES / MODIS Christopher and Zhang , 2004)

(CERES / VIRS Loeb and Kato, 2002 )

Conversion

Scene Identification procedure

Approach:Approach:

Present Study:Present Study:

Similar approach

brdbnd Rad.

mult. CHN IMG

: GERB 15 mins 50 x 50 km

: SEVIRI - 12 Chn 15 mins 3X3 Km

GERB HR productsGERB HR products 15 mins

10 x 10 km

Scene Identification procedure

reflected SWLSWL

τ 1 .6

τ 0 .8

τ 0 .6

narrow 2 bdbnd

(R)(R)

Objectives Objectives (11/2009)

D3.2.1D3.2.1 : ‘Maps of Geostationary Earth Radiation Budget (GERB) aerosol scene identification available on the ADIENT website’

D3.2.2D3.2.2 : ‘New aerosol anisotropy factors (R) for anthropogenic aerosol through combined analysis of aircraft /satellite observations’

α) Maps of : i. GERB HR τ1.6, τ0.8 and τ0.6

ii. α = f (τ1.6, τ0.6) & α = f (τ0.8, τ0.6)

iii. GERB HR SWL and SWF

iv. R = f (SWL, SWF)

D3.2.1D3.2.1 : ‘Maps of Geostationary Earth Radiation Budget (GERB) aerosol scene identification available on the ADIENT website’

Work thus farWork thus far

β) Compile and plot data-series of the above data along the track of each flight

FLT DATE TAKEOFF LANDING PROJECTb333 12/13/07 10:45 15:45 ADIENTb334 12/18/07 11:00 16:00 VISURBb335 12/19/07 11:00 16:00 ADIENTb355 04/02/08 12:00 16:00 ADIENTb356 04/10/08 10:00 16:00 ADIENTb357 04/16/08 10:45 18:30 ADIENTb401 09/18/08 14:00 18:00 ADIENTb402 09/19/08 10:00 15:00 ADIENTb404 09/23/08 10:00 15:00 ADIENTb406 09/25/08 10:00 15:30 ADIENT

B356B356

10:56

11:11

11:41

11:56

12:11

12:26

12:56

15:26

j

iij

j

i

ln

ln

12:11

12:26

F

LR

π

12:26

B355B35504/200804/2008

B356B35604/200804/2008

B357B35704/200804/2008

B402B40209/200809/2008

B356B35604/200804/2008

B355B35504/200804/2008

B357B35704/200804/2008

B402B40209/200809/2008

Future Work Future Work

D3.2.2D3.2.2 : ‘New aerosol anisotropy factors (R) for anthropogenic aerosol through combined analysis of aircraft /satellite observations’

SWFSWF• SWLSWL↑↑

Conversion

),(),(

ατF

LατR

scene,geomety, viewing scene,geomety, viewingocean

There is no specific aerosol treatment in the GERB processing chain.

i. CERES correction code (Brindley and Russell, 2008)

ii. Empirical ADMs = f(Vwind, geometry, τ, n) (Zhang and

Christopher, 2005)

• Implementation of R effect in the GERB Implementation of R effect in the GERB conversion chain conversion chain

iii. Develop Theoretical ADMs similar to the ones by Brindley and Russell (2008) using the aerosol properties from the FAAM flights.

References :

Brindley, H.E. and J.E. Russell, 2008: Assessing the Errors in shortwave radiative fluxes inferred from the Geostationary Earth Radiation Budget (GERB) Instrument in the Presence of Dust Aerosol. J. Appl. Meteor., 47, 1659-1680.

Brindley, H.E. and A. Ignatov, 2006: Retrieval of mineral aerosol optical depth and size information from Meteosat Second Generation SEVIRI solar reflectances bands. Remote Sens. Environ., 102, 344-363.

Christopher, S.A. and J. Zhang, 2004: Cloud free shortwave aerosol radiative effect over oceans: Strategies for identifying anthropogenic forcing from Terra satellite measurements. Geophys. Res. Lett., 31, L18101.

Loeb, N.G. and S. Kato, 2002: Top-of-Atmosphere Direct Radiative Effect of aerosols over the Tropical Oceans from the Clouds and the Earth’s Radiant Energy System (CERES) satellite instrument. J. Climate, 15, 1474-1484.

VIS 0.6VIS 0.8

IR 8.7 Earth Imaging Principle