https://essopenarchive.org/doi/pdf/10.22541/essoar.172374105.56686934
*Authors* Qiurun Yu, Yi Huang *15 August 2024* *Abstract * To facilitate the quantification of the stratospheric aerosol radiative effect, this study generates a set of aerosol direct radiative effect (ADRE) kernels based on MERRA-2 reanalysis data. These radiative kernels measure the sensitivities of ADRE to perturbations in scattering and absorbing aerosol optical depth (AOD), respectively. Both broadband and band-by-band radiative kernels are developed to account for the wavelength dependency of ADRE. The broadband kernels are then emulated by a multivariate regression model, which predicts the kernel values from a handful of predictors, including the top-of-atmosphere (TOA) insolation, TOA reflectance, and stratospheric AOD. These kernels offer an efficient and versatile way to assess the ADRE of stratospheric aerosols. The ADREs of the 2022 Hunga volcano eruption and the 2020 Australia wildfire are estimated from the kernels and validated against radiative transfer model-calculated results. The Hunga eruption induced a global mean cooling forcing of -0.46 W/m² throughout 2022, while the Australia wildfire caused a warming forcing of +0.28 W/m² from January to August. The kernel estimation can capture over 90% of the ADRE variance with relative error within 10%, in these assessments. The results demonstrate the spectral dependencies of stratospheric ADRE and highlight the distinct radiative sensitivity of stratospheric aerosols, which differs significantly from that of tropospheric aerosols. *Plain Language Summary * Stratospheric aerosols influence the Earth's energy balance by scattering and absorbing solar radiation, making it crucial to accurately measure their radiative impact. However, quantifying the aerosol radiative impact is computationally expensive if using radiative transfer models. In this work, we develop a set of aerosol radiative kernels, which can provide a flexible and efficient means for calculating the radiative effects of stratospheric aerosols. The kernels have been demonstrated to effectively quantify the radiative impacts of stratospheric aerosols resulting from wildfire and volcanic eruption events. *Source: ESS OPEN ARCHIVE * -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAHJsh99c02wY2KjWpRUk8LzHfQ3Z2g7zF56%2Bf82-ieJ5zFhF9g%40mail.gmail.com.
