Algorithm Development for Retrieval of Aerosol Properties from
Satellite Measurements of Intensity and Polarization

A contribution to ACCENT-TROPOSAT-2, Task Group 1

Otto Hasekamp

SRON, National Institute for Space Research, Sorbonnelaan2, 3584 CA Utrecht, The Netherlands
Tel. +31 30 2538563
FAX +31 30 2540860

This study concerns the development of algorithms for the retrieval of aerosol properties from satellite measurements of intensity and polarization. The retrieval will be based on an accurate linearized vector radiative transfer model in combination with an analytical inversion approach.

Activities

1.    Development of a linearized radiative transfer model for the purpose of aerosol retrieval. The linearized radiative transfer model has to simulate the intensity vector at the top of the atmosphere and additionally has to provide analytical derivatives of the four Stokes parameters with respect to physical aerosol parameters, such as effective radius and refractive index. Such a radiative transfer model allows to use an analytical inversion approach.

2.    Investigation of the aerosol retrieval capability of different types of satellite measurements, e.g. single view, multi view, intensity only, intensity and polarization. The outcome of this activity can be used for the definition of future satellite instruments capable of providing useful aerosol information.

3.    Development of retrieval algorithms. This activity will be started by the development of an aerosol retrieval algorithm for measurements of the Global Ozone Monitoring Experiment-2 (GOME-2). GOME-2 will contain Polarization Measuring Devices (PMDs) that will provide measurements of intensity and polarization.  This activity includes a detailed sensitivity study of the aerosol retrieval algorithm. At a later stage also other satellite instruments (e.g. POLDER) will be considered.

4.    Application of the developed retrieval algorithm for the purpose of aerosol retrieval from GOME-2 data, and validation of the results using independent ground data.

Time schedule

 

2004

2005

2006

2007

2008

2009

Activity 1

*

*

 

 

 

 

Activity 2

*

*

 

 

 

 

Activity 3

*

*

*

*

*

*

Activity 4

 

 

*

*

*

*

 Aims for the first 18 months

   Development of an approach for the linearization of radiative transfer with respect to physical aerosol properties.

   Provision of an overview of the possibilities for aerosol retrieval from GOME-2.

Long term goals

   Provision of a validated aerosol retrieval algorithm for GOME-2.

   Retrieval of aerosol properties from other instruments (e.g. POLDER).

   Definition of specifications for a possible future satellite instrument dedicated to aerosol retrieval.

Approximate manpower and cost

 

2004

2005

2006

2007

2008

2009

Personnel / man-years

1

1

1

1

1

1

Yearly cost (kECU)

60

60

60

60

60

60

Likely funding agencies

NL National Bodies, O3-SAF

Co-workers

Prof. Dr. Ilse Aben, SRON

Dr. Jochen Landgraf, SRON



 

 

 


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