ATSR Aerosol_cci SU
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The Swansea Univertsity (SU) AATSR product is one of three ATSR-2/AATSR aerosol ECV products produced in the ESA Aerosol_cci project. This aerosol product is produced over both land and ocean using model inversion, using both views of the (A)ATSR, and the four solar reflective channels. SU AATSR is applied to ATSR-2 (on ERS-2; 1995-2003) and AATSR (on ENVISAT; 2002-2012), which together span a period of 17 years. The SU dual view aerosol retrieval algorithm allows for AOD estimation without prior information on surface reflectance. The SU ATSR standard products are AOD, aerosol model as a a fraction of four aerosol components, and AOD per-retrieval uncertainty.
Example results: (left): global aggregated AOD for 2008; (right) 17-years time series of annual mean AOD over land at 550 nm for the whole globe, compared with AERONET.
| Satellite | ERS-2 (ESA), ENVISAT (ESA) |
| Instrument(s) | ATSR-2, AATSR |
| Algorithm PI | Peter North |
| Contact Details | p.r.j.north[at]swan.ac.uk, a.heckel[at]swan.ac.uk |
| Parameter(s) |
L2: AOD at 0.55, 0.67, 0.87 and 1.6 μm; Ångström exponent (0.55-0.87); per-pixel uncertainty estimates, aerosol mixture fractions (fine/coarse, absorbing/non-absorbing, dust/sea salt), L3: Mean and s.d. of variables, and also mean fine mode AOD, at 1deg spatially, and at daily and monthly time steps |
| Aerosol algorithm | SU ATSR |
| Cloud screening |
Combination of instrument flags and further tests, and cloud edge post-processing. |
| Aerosol model |
Aerosol_cci common aerosol components (de Leeuw et al., 2013). |
| Retrieval assumptions |
Fit to North et al. (1999) surface model over land. Cox and Munk surface model for retrieval over ocean |
| Retrieval limitations | Retrieval over land is less well constrained at high optical depths, and retrieval limited to AOT<2.0. |
| Spatial, temporal coverage | 1995-2012, global |
| Spatial, temporal resolution | L2 (10x10 km2) and L3 (1°×1°) resolution datasets; ATSR swath width is 512 km, resulting in global coverage in 5-6 days. |
| Operations status | Annual reprocessing |
| Validation status | Based on intercomparison of L2 and L3 products with AERONET and with other satellite data |
| Quality control | Uncertainty estimate for each AOD includes propagation of instrument and surface uncertainty and inversion error surface. |
| last algorithm version | SU_AATSR Ver 4.2 |
| last validation | 02/2015 |
| Algorithm description | Product format description |
| Version explanation | Validation summary |
| Publications |
| Product data access ATSR-2 |
| Product data access ATSR |
| Image / quicklook data access |