Cloudy-sky contributions to the direct aerosol effect
نویسندگان
چکیده
منابع مشابه
Quantifying above-cloud aerosol using spaceborne lidar for improved understanding of cloudy-sky direct climate forcing
[1] Estimates of global mean direct climate forcing by absorbing aerosols located above boundary layer clouds are large, uncertain, and almost entirely unconstrained by observations. Spaceborne lidar offers a new opportunity for global constraints. Here we examine techniques for using liquid water clouds as lidar targets, allowing aerosol optical depth and Ångström exponent to be deduced direct...
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Using the GlobAEROSOL-AATSR dataset, estimates of the instantaneous, clear-sky, direct aerosol radiative effect and radiative forcing have been produced for the year 2006. Aerosol Robotic Network sun-photometer measurements have been used to characterise the random and systematic error in the GlobAEROSOL product for 22 regions covering the globe. Representative aerosol properties for each regio...
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Cross-correlations of theWilkinson Microwave Anisotropy Probe (WMAP) full sky K-, Ka-, Q-, V-, and W-band maps with the 1.4 GHz NVSS source count map and the HEAO I A2 2–10 keV full sky X-ray flux map are used to constrain rms fluctuations due to unresolved microwave sources in theWMAP frequency range. In the Q band (40.7 GHz), a lower limit, taking account of only those fluctuations correlated...
متن کاملFirst observational estimates of global clear sky shortwave aerosol direct radiative effect over land
[1] Using one year (2000–2001) of merged Multiangle Imaging SpectroRadiometer (MISR), Moderate Resolution Imaging SpectroRadiometer (MODIS) and Clouds and the Earth’s Radiant Energy System (CERES) data sets from NASA’s Terra satellite, we estimate the top of atmosphere cloud-free direct radiative effect (DRE) of aerosols over global land areas. The global mean shortwave DRE is 5.1 ± 1.1 Wm 2 al...
متن کاملParameterization of clear-sky surface irradiance and its implications for estimation of aerosol direct radiative effect and aerosol optical depth
Aerosols impact clear-sky surface irradiance () through the effects of scattering and absorption. Linear or nonlinear relationships between aerosol optical depth (τa) and have been established to describe the aerosol direct radiative effect on (ADRE). However, considerable uncertainties remain associated with ADRE due to the incorrect estimation of (τa in the absence of aerosols). Based on data...
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ژورنال
عنوان ژورنال: Atmospheric Chemistry and Physics
سال: 2020
ISSN: 1680-7324
DOI: 10.5194/acp-20-8855-2020