Direct radiative effect of aerosols based on PARASOL and OMI satellite observations

Lacagnina, Carlo; Hasekamp, Otto; Torres, Omar

doi:10.1002/2016jd025706

Cited by 49 publications

(50 citation statements)

References 82 publications

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“…Another important science application of the OMI and A-train aerosol products is the first global estimate of the shortwave direct radiative effect of aerosols at the top of the atmosphere (TOA-DREA) over land and ocean (Lacagnina et al, 2016). This work was carried out using data based on global satellite observations of SSA, phase function, and AOD from PARASOL, in synergy with OMI SSA retrievals.…”

Section: Aerosol Productsmentioning

confidence: 99%

The Ozone Monitoring Instrument: overview of 14 years in space

et al. 2018

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Abstract. This overview paper highlights the successes of the Ozone Monitoring Instrument (OMI) on board the Aura satellite spanning a period of nearly 14 years. Data from OMI has been used in a wide range of applications and research resulting in many new findings. Due to its unprecedented spatial resolution, in combination with daily global coverage, OMI plays a unique role in measuring trace gases important for the ozone layer, air quality, and climate change. With the operational very fast delivery (VFD; direct readout) and near real-time (NRT) availability of the data, OMI also plays an important role in the development of operational services in the atmospheric chemistry domain.

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Section: Aerosol Productsmentioning

confidence: 99%

The Ozone Monitoring Instrument: overview of 14 years in space

et al. 2018

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“…We use the Mie-T matrix-improved geometrical optics database by Dubovik et al (2006) along with their proposed spheroid aspect ratio distribution for computing optical properties for a mixture of spheroids and spheres. For the RT model we refer to Landgraf et al (2001), Hasekamp and Landgraf (2002), and Hasekamp and Landgraf (2005).…”

Section: Parametric Two-mode Retrievalmentioning

confidence: 99%

Retrieval of aerosol microphysical and optical properties over land using a multimode approach

Hasekamp

2018

Atmos. Meas. Tech.

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Abstract. Polarimeter retrievals can provide detailed and accurate information on aerosol microphysical and optical properties. The SRON aerosol algorithm is one of the few retrieval approaches that can fully exploit this information. The algorithm core is a two-mode retrieval in which effective radius (reff), effective variance (veff), refractive index, and column number are retrieved for each mode; the fraction of spheres for the coarse mode and an aerosol layer height are also retrieved. Further, land and ocean properties are retrieved simultaneously with the aerosol properties. In this contribution, we extend the SRON aerosol algorithm by implementing a multimode approach in which each mode has fixed reff and veff. In this way the algorithm obtains more flexibility in describing the aerosol size distribution and avoids the high nonlinear dependence of the forward model on the aerosol size parameters. Conversely, the approach depends on the choice of the modes. We compare the performances of multimode retrievals (varying the number of modes from 2 to 10) with those based on the original (parametric) two-mode approach. Experiments with both synthetic measurements and real measurements (PARASOL satellite level-1 data of intensity and polarization) are conducted. The synthetic data experiments show that multimode retrievals are good alternatives to the parametric two-mode approach. It is found that for multimode approaches, with five modes the retrieval results can already be good for most parameters. The real data experiments (validated with AERONET data) show that, for the aerosol optical thickness (AOT), multimode approaches achieve higher accuracy than the parametric two-mode approach. For single scattering albedo (SSA), both approaches have similar performances.

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“…Passive satellite remote sensing estimates of the aerosol DRE (Yu et al 2006, and references therein) can be highly uncertain outside of cloud-free ocean scenes (Li et al 2009;Kokhanovsky et al 2010). Advances have been made in passive retrievals over optically thick cloud (Torres et al 2007;Waquet et al 2009Waquet et al , 2013de Graaf et al 2012;Jethva et al 2013;Meyer et al 2015) and land (Dubovik et al 2011;Lyapustin et al 2011a,b), but, even with these advanced techniques, model information is needed to make truly global all-sky estimates (e.g., Lacagnina et al 2017). Active remote sensing-for example, the lidar on board the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite (CALIPSO; Winker et al 2009Winker et al , 2010-allows for more complete and consistent retrievals in all-sky conditions over both land and ocean (Henderson et al 2013;Oikawa et al 2013;Matus et al 2015;Oikawa et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Aerosol Direct Radiative Effect Sensitivity Analysis

et al. 2020

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Both to reconcile the large range in satellite-based estimates of the aerosol direct radiative effect (DRE) and to optimize the design of future observing systems, this study builds a framework for assessing aerosol DRE uncertainty. Shortwave aerosol DRE radiative kernels (Jacobians) were derived using the MERRA-2 reanalysis data. These radiative kernels give the differential response of the aerosol DRE to perturbations in the aerosol extinction coefficient, aerosol single-scattering albedo, aerosol asymmetry factor, surface albedo, cloud fraction, and cloud optical depth. This comprehensive set of kernels provides a convenient way to consistently and accurately assess the aerosol DRE uncertainties that result from observational or model-based uncertainties. The aerosol DRE kernels were used to test the effect of simplifying the full vertical profile of aerosol scattering properties into column-integrated quantities. This analysis showed that, although the clear-sky aerosol DRE can be had fairly accurately, more significant errors occur for the all-sky DRE. The sensitivity in determining the broadband spectral dependencies of the aerosol scattering properties directly from a limited set of wavelengths was quantified. These spectral dependencies can be reasonably constrained using column-integrated aerosol scattering properties in the midvisible and near-infrared wavelengths. Separating the aerosol DRE and its kernels by scene type shows that accurate aerosol properties in the clear sky are the most crucial component of the global aerosol DRE. In cloudy skies, determining aerosol properties in the presence of optically thin cloud is more radiatively important than doing so when optically thick cloud is present.

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Direct radiative effect of aerosols based on PARASOL and OMI satellite observations

Cited by 49 publications

References 82 publications

The Ozone Monitoring Instrument: overview of 14 years in space

The Ozone Monitoring Instrument: overview of 14 years in space

Retrieval of aerosol microphysical and optical properties over land using a multimode approach

Aerosol Direct Radiative Effect Sensitivity Analysis

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