Rethinking the correction for absorbing aerosols in the OMI- and TROPOMI-like surface UV algorithms
نویسندگان
چکیده
Abstract. Satellite estimates of surface UV irradiance have been available since 1978 from the TOMS spectrometer and continued with significantly improved ground resolution using Ozone Monitoring Instrument (OMI 2004–current) Sentinel 5 Precursor (S5P 2017–current). The retrieval algorithm remains essentially same: it first clear-sky based on measured ozone then accounts for attenuation by clouds aerosols, applying two consecutive correction factors. When estimating total aerosol effect in irradiance, there are major classes aerosols to be considered: (1) that only scatter radiation (2) both absorb radiation. former is implicitly included effective Lambertian-equivalent scene reflectivity (LER), so scattering influence estimated through cloud factor. Aerosols attenuate more strongly than non-absorbing same extinction optical depth. Moreover, these also outgoing satellite-measured radiance, factor treats as purely underestimates their depth (AOD), causing underestimation LER overestimation irradiance. Therefore, absorption, additional information needed, such a model-based monthly climatology absorption (AAOD). A absorbing was proposed almost decade ago later implemented operational OMI TROPOMI algorithms. In this study, however, we show still room improvement better account solar zenith angle (SZA) dependence nonlinearity attenuation, result propose an scheme. There main differences between new one currently First, function AAOD only, while additionally takes into account. Second, second-order polynomial account, if compared one, thus describes over larger range AAOD. To illustrate potential impact global estimates, applied current fields used algorithm, showing typical ±5 %. This easy implement operationally existing climatology.
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ژورنال
عنوان ژورنال: Atmospheric Measurement Techniques
سال: 2021
ISSN: ['1867-1381', '1867-8548']
DOI: https://doi.org/10.5194/amt-14-4947-2021