Regional and monthly and clear-sky aerosol direct    radiative effect (and forcing) derived from the GlobAEROSOL-AATSR    satellite aerosol product

Thomas, G. E.; Chalmers, N.; Harris, Bethan L.; Grainger, R. G.; Highwood, Eleanor J.

doi:10.5194/acpd-12-18459-2012

Cited by 4 publications

(3 citation statements)

References 42 publications

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“…Clear‐sky global‐mean estimates of the shortwave (SW) aerosol DRE at the top of atmosphere (TOA) range between −2 and −7 W m −2 (e.g., Boucher et al., 2013; Christopher & Zhang, 2002; Henderson et al., 2013; Matus et al., 2019, 2015; Myhre et al., 2007; Reddy et al., 2005; Remer & Kaufman, 2006; Thomas et al., 2013; Yu et al., 2006; T. X.‐P. Zhao et al., 2011; T. X. Zhao et al., 2008).…”

Section: Introductionmentioning

confidence: 99%

Aerosol Direct Radiative Effects at the ARM SGP and TWP Sites: Clear Skies

Balmes

2021

JGR Atmospheres

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The clear‐sky aerosol direct radiative effect (DRE) was estimated at the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) and Tropical Western Pacific (TWP) sites. The NASA Langley Fu‐Liou radiation model was used with observed inputs including aerosol vertical extinction profile from the Raman lidar; spectral aerosol optical depth (AOD), single‐scattering albedo and asymmetry factor from Aerosol Robotic Network; temperature and water vapor profiles from radiosondes; and surface shortwave (SW) spectral albedo from radiometers. A radiative closure experiment was conducted for clear‐sky conditions. The mean differences of modeled and observed surface downwelling SW total fluxes were 1 W m−2 at SGP and 2 W m−2 at TWP, which are within observational uncertainty. At SGP, the estimated annual mean clear‐sky aerosol DRE is −3.00 W m−2 at the top of atmosphere (TOA) and −6.85 W m−2 at the surface. The strongest aerosol DRE of −4.81 (−10.77) W m−2 at the TOA (surface) are in the summer when AODs are largest. The weakest aerosol DRE of −1.28 (−2.77) W m−2 at the TOA (surface) are in November–January when AODs and single‐scattering albedos are lowest. At TWP, the annual mean clear‐sky DRE is −2.82 W m−2 at the TOA and −10.34 W m−2 at the surface. The strongest aerosol DRE of −5.95 (−22.20) W m−2 at the TOA (surface) are in November (October) due to the biomass burning season’s peak. The weakest aerosol DRE of −0.96 (−4.16) W m−2 at the TOA (surface) are in March (April) when AODs are smallest.

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Section: Introductionmentioning

confidence: 99%

Aerosol Direct Radiative Effects at the ARM SGP and TWP Sites: Clear Skies

Balmes

2021

JGR Atmospheres

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“…Studies on the effect of aerosols on climate were traditionally made by using chemical transport models (CTM) or global climate models (GCM), or their regional versions. In the last decade satellite observations have increasingly been used to provide observation-based estimates of the effects of aerosols on climate (Yu et al, 2006;Thomas et al, 2012). Satellite observations offer the advantage of large spatial coverage with the same instrument and technique as implemented in an instrument-specific retrieval algorithm, at the cost of accuracy and temporal coverage offered by most ground-based observations.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of seven European aerosol optical depth retrieval algorithms for climate analysis

Leeuw

Popp

Bevan

et al. 2015

Remote Sensing of Environment

126

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Satellite data are increasingly used to provide observation-based estimates of the effects of aerosols on climate. The Aerosol-cci project, part of the European Space Agency's Climate Change Initiative (CCI), was designed to provide essential climate variables for aerosols from satellite data. Eight algorithms, developed for the retrieval of aerosol properties using data from AATSR (4), MERIS (3) and POLDER, were evaluated to determine their suitability for climate studies. The primary result from each of these algorithms is the aerosol optical depth (AOD) at several wavelengths, together with the Ångström exponent (AE) which describes the spectral variation of the AOD for a given wavelength pair. Other aerosol parameters which are possibly retrieved from satellite observations are not considered in this paper. The AOD and AE (AE only for Level 2) were evaluated against independent collocated observations from the ground-based AERONET sun photometer network and against "reference" satellite data provided by MODIS and MISR. Tools used for the evaluation were developed for daily products as produced by the retrieval with a spatial resolution of 10×10km2 (Level 2) and daily or monthly aggregates (Level 3). These tools include statistics for L2 and L3 products compared with AERONET, as well as scoring based on spatial and temporal correlations. In this paper we describe their use in a round robin (RR) evaluation of four months of data, one month for each season in 2008. The amount of data was restricted to only four months because of the large effort made to improve the algorithms, and to evaluate the improvement and current status, before larger data sets will be processed. Evaluation criteria are discussed. Results presented show the current status of the European aerosol algorithms in comparison to both AERONET and MODIS and MISR data. The comparison leads to a preliminary conclusion that the scores are similar, including those for the references, but the coverage of AATSR needs to be enhanced and further improvements are possible for most algorithms. None of the algorithms, including the references, outperforms all others everywhere. AATSR data can be used for the retrieval of AOD and AE over land and ocean. PARASOL and one of the MERIS algorithms have been evaluated over ocean only and both algorithms provide good results. © 2013 Elsevier Inc

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“…In the last decades, considerable effort has been done in order to quantify the magnitude of the aerosol direct radiative effects considering clear-sky situations (Zhao et al, 2011;Nikitidou et al, 2014) or all-sky situations (Myhre et al, 2007Chand et al, 2009;Heald et al, 2014;Oh et al, 2014) and also to investigate the indirect effects of the aerosols on the solar radiation (Rap et al, 2013). For example, based on the Monitoring Atmospheric Composition and Climate re-analysis aerosol data, Bellouin et al (2013) estimated the global aerosol direct radiative effects at the surface in clear-sky situations to be −10.8 ± 1.9 W m −2 , while Thomas et al (2012) reported −12 ± 6 W m −2 using GlobAEROSOL-AATSR satellite aerosol products. Yu et al (2006) calculated the clear-sky aerosol direct effects separately for land and ocean surfaces quantifying them to be −11.8 ± 1.9 and −8.8 ± 0.7 W m −2 , respectively; the best estimates of Bellouin et al (2013) are −11.5 ± 1.9 W m −2 for land and −10.6 ± 1.9 W m −2 for ocean.…”

Section: Introductionmentioning

confidence: 99%

Aerosol radiative effects under clear skies over Europe and their changes in the period of 2001–2012

Bartók

2016

Intl Journal of Climatology

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In the study, the clear‐sky aerosol radiative effects have been quantified at 52 European sites using empirical and radiative transfer modelling approaches. Furthermore, the trends of the aerosol radiative effects are also determined for the period of 2001–2012. The aerosol radiative effects are simulated using the Mesoscale Atmospheric Global Irradiance Code radiation code with aerosol and water vapour climatology. The annual mean of the surface aerosol radiative effects in clear‐sky situations over Europe is −7.1 ± 2.9 W m−2. The trends of the aerosol radiative effects are derived assigning radiative effects to monthly Moderate Resolution Imaging Spectroradiometer aerosol optical depth time series applying linear fitting. In the indirect approach, the clear‐sky situations are selected from daily surface solar radiation observations from the Word Radiation Data Centre, and the trends of the aerosol radiative effects are delimitated in these clear‐sky radiation time series. The two approaches give good fit, based on the direct approach the annual trend of the aerosol radiative effects on clear‐sky solar surface radiation is −4.41 W m−2 per decade for the period of 2001–2013, while in the case of the indirect approach, this trend is found to be −4.46 W m−2 per decade. The seasonal trends of the aerosol radiative effects vary between −7.57 and −0.17 W m−2 per decade indicating stronger decreases in summertime. The results are presented for four sub‐regions of Europe detecting negative changes in all cases with a stronger decrease in the central, north‐eastern and southern part of the continent. The trends of the aerosol radiative effect have the same magnitude as the trends detected in clear‐sky solar surface radiation, and are an order of magnitude higher than the radiative effects of water vapour (0.20 W m−2 per decade).

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Regional and monthly and clear-sky aerosol direct radiative effect (and forcing) derived from the GlobAEROSOL-AATSR satellite aerosol product

Cited by 4 publications

References 42 publications

Aerosol Direct Radiative Effects at the ARM SGP and TWP Sites: Clear Skies

Aerosol Direct Radiative Effects at the ARM SGP and TWP Sites: Clear Skies

Evaluation of seven European aerosol optical depth retrieval algorithms for climate analysis

Aerosol radiative effects under clear skies over Europe and their changes in the period of 2001–2012

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