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- W4248596089 abstract "Abstract. Retrievals of aerosol optical depth (AOD) at 388 nm over the ocean from the Ozone Monitoring Instrument (OMI) two-channel near UV algorithm (OMAERUV) have been compared with independent AOD measurements. The analysis was carried out over the open ocean (OMI and MODIS AOD comparisons) and over coastal and island sites (AERONET and OMI). Also, a research version of the retrieval algorithm (using MODIS and CALIPSO information as constraints) was utilized to evaluate the sensitivity of the retrieval to different assumed aerosol properties. Overall, the comparison resulted in differences (OMI minus independent measurements) within the expected levels of uncertainty for the OMI AOD retrievals. Using examples from case studies with outliers, the reasons that lead to the observed differences are examined with specific purpose to determine if they are related to instrument (i.e., pixel size, calibration) limitations or algorithm assumptions (such as aerosol shape, aerosol height). The analysis confirms that OMAERUV does an adequate job at rejecting cloudy scenes within the instrument capabilities. There is a residual cloud contamination in OMI pixels with quality flag 0 (the best conditions for aerosol retrieval according to the algorithm) resulting in a bias towards high AODs in OMAERUV. This bias is more pronounced at low concentrations of absorbing aerosols (AOD 388 nm ~< 0.5). For higher aerosol loadings, the bias remains within OMI’s AOD uncertainties. In pixels where OMAERUV assigned a dust aerosol model, a fraction of them (< 20 %) had retrieved AODs significantly lower than AERONET and MODIS AODs. In a case study, a detailed examination of the aerosol height from CALIOP and AODs from MODIS along with sensitivity tests was carried out by varying the different assumed parameters in the retrieval (imaginary index of refraction, size distribution, aerosol height, particle shape). It was found that spherical shape assumption for dust in the current retrieval is the main cause of the underestimate. Also, it is shown with an example how an incorrect assumption of the aerosol height can lead to an underestimate but this is not as large as the effect of particle shape. These findings will be incorporated in a future version of the retrieval algorithm." @default.
- W4248596089 created "2022-05-12" @default.
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- W4248596089 date "2016-02-16" @default.
- W4248596089 modified "2023-10-16" @default.
- W4248596089 title "The Role of Cloud Contamination, Aerosol Layer Height and Aerosol Model in the Assessment of the OMI near-UV Retrievals over the Ocean" @default.
- W4248596089 doi "https://doi.org/10.5194/amt-2016-3" @default.
- W4248596089 hasPublicationYear "2016" @default.
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