An aerosol climatology for global models based on the tropospheric aerosol scheme in the Integrated Forecasting System of ECMWF

Bozzo, Alessio; Benedetti, Angela; Flemming, Johannes; Kipling, Zak; Rémy, Samuel

doi:10.5194/gmd-13-1007-2020

Cited by 58 publications

(56 citation statements)

References 72 publications

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“…In this case, in addition to improved cloud parameterizations, the use of daily resolved aerosol data could possibly reduce the model uncertainties, for example, the EU-METSAT polar multisensor aerosol optical property product (PMAP), available since 2014, or other products provided by the Copernicus Atmosphere Monitoring Services (CAMS). For recent applications see also Bozzo et al (2020) and Rontu et al (2020). Among the wavelengths considered for the downward planar irradiance, 412 and 681 nm appear to result in large uncertainties.…”

Section: Discussionmentioning

confidence: 99%

Assessment of the spectral downward irradiance at the surface of the Mediterranean Sea using the radiative Ocean-Atmosphere Spectral Irradiance Model (OASIM)

et al. 2021

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Abstract. A multiplatform assessment of the Ocean–Atmosphere Spectral Irradiance Model (OASIM) radiative model focussed on the Mediterranean Sea for the period 2004–2017 is presented. The BOUée pour l'acquiSition d'une Série Optique à Long termE (BOUSSOLE) mooring and biogeochemical Argo (BGC-Argo) float optical sensor observations are combined with model outputs to analyse the spatial and temporal variabilities in the downward planar irradiance at the ocean–atmosphere interface. The correlations between the data and model are always higher than 0.6. With the exception of downward photosynthetic active radiation and the 670 nm channel, correlation values are always higher than 0.8 and, when removing the inter-daily variability, they are higher than 0.9. At the scale of the BOUSSOLE sampling (15 min temporal resolution), the root mean square difference oscillates at approximately 30 %–40 % of the averaged model output and is reduced to approximately 10 % when the variability between days is filtered out. Both BOUSSOLE and BGC-Argo indicate that bias is up to 20 % for the irradiance at 380 and 412 nm and for wavelengths above 670 nm, whereas it decreases to less than 5 % at the other wavelengths. Analysis of atmospheric input data indicates that the model skill is strongly affected by cloud dynamics. High skills are observed during summer when the cloud cover is low.

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Section: Discussionmentioning

confidence: 99%

Assessment of the spectral downward irradiance at the surface of the Mediterranean Sea using the radiative Ocean-Atmosphere Spectral Irradiance Model (OASIM)

et al. 2021

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“…This vertical distribution in CNRM‐CM6‐1 depends only on the aerosol type and is therefore unchanged in time and space. It is calculated from a pressure‐dependent function using a scale height specific to each aerosol type as described in Bozzo et al (). Other aerosol optical properties used as input in the radiative transfer scheme, both in CNRM‐CM6‐1 and CNRM‐ESM2‐1, namely, the single scattering albedo (SSA; 0 to 1 range) and the asymmetry parameter (ASY;

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1 to 1 range), are prescribed depending on the aerosol type, relative humidity (except for DD and BC), and wavelength.…”

Section: Methodsmentioning

confidence: 99%

Present‐Day and Historical Aerosol and Ozone Characteristics in CNRM CMIP6 Simulations

Michou

Nabat

Saint‐Martin

et al. 2020

J Adv Model Earth Syst

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Characteristics and radiative forcing of the aerosol and ozone fields of two configurations of the Centre National de Recherches Météoroglogiques (CNRM) and Cerfacs climate model are analyzed over the historical period (1850-2014), using several Coupled Model Intercomparison Project 6 (CMIP6) simulations. CNRM-CM6-1 is the atmosphere-ocean general circulation model including prescribed aerosols and a linear stratospheric ozone scheme, while the Earth System Model CNRM-ESM2-1 has interactive tropospheric aerosols and chemistry of the midtroposphere aloft. The representations of aerosols and ozone in CNRM-CM6-1 are issued from simulations of CNRM-ESM2-1, and this ensures some comparability of both representations. In particular, present-day anthropogenic aerosol optical depths are similar (0.018), and their spatial patterns correspond to those of reference data sets such as MACv2 and MACv2-SP despite a negative bias. Effective radiative forcings (ERFs) have been estimated using 30-year fixed sea surface temperature simulations (piClim) and several calls to the radiative scheme. Present-day anthropogenic aerosol ERF, aerosol-radiation ERF, and aerosol cloud ERF are fully within CMIP5 estimates and, respectively, equal to −1.10, −0.36, and −0.81 W m −2 for CNRM-CM6-1 and −0.21, −0.61, and −0.74 W m −2 for CNRM-ESM2-1. Additional CMIP6-type piClim simulations show that these differences are mainly due to the interactivity of the aerosol scheme whose impact is confirmed when assessing the response of both climate model configurations to rising CO 2 . Present-day stratospheric ozone ERF, equal to −0.04 W m −2 , is in agreement with that of the CMIP6 ozone. No trend appears in the ozone ERF over the historical period although the evolution of the total column ozone is correctly simulated. Plain Language SummaryThe manuscript documents the Météo-France Centre National de Recherches Météorologiques aerosol-chemistry modeling contributions to the sixth Coupled Model Intercomparison Project that supports the sixth IPCC Assessment Report of climate change. It establishes that their results are suitable for use by the scientific community in the analysis of the sixth Coupled Model Intercomparison Project experiments. The authors provide an evaluation of the model performance in both present-day and historical (1850-2014) contexts, as well as a detailed analysis of the model calculated effective radiative forcing due to ozone and aerosols.

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“…The specific version of GEOS used in this study also includes assimilation of bias-corrected aerosol optical depth (AOD) from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors. This is the so-called MERRAero (Buchard et al, 2015). Driven by the MERRA meteorology, MERRAero was run at a global 0.5 × 0.625 latitude-by-longitude horizontal resolution with 72 vertical layers and 3 h frequency.…”

Section: Geos-merraeromentioning

confidence: 99%

A global model–measurement evaluation of particle light scattering coefficients at elevated relative humidity

et al. 2020

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Abstract. The uptake of water by atmospheric aerosols has a pronounced effect on particle light scattering properties, which in turn are strongly dependent on the ambient relative humidity (RH). Earth system models need to account for the aerosol water uptake and its influence on light scattering in order to properly capture the overall radiative effects of aerosols. Here we present a comprehensive model–measurement evaluation of the particle light scattering enhancement factor f(RH), defined as the particle light scattering coefficient at elevated RH (here set to 85 %) divided by its dry value. The comparison uses simulations from 10 Earth system models and a global dataset of surface-based in situ measurements. In general, we find a large diversity in the magnitude of predicted f(RH) amongst the different models, which can not be explained by the site types. Based on our evaluation of sea salt scattering enhancement and simulated organic mass fraction, there is a strong indication that differences in the model parameterizations of hygroscopicity and model chemistry are driving at least some of the observed diversity in simulated f(RH). Additionally, a key point is that defining dry conditions is difficult from an observational point of view and, depending on the aerosol, may influence the measured f(RH). The definition of dry also impacts our model evaluation, because several models exhibit significant water uptake between RH = 0 % and 40 %. The multisite average ratio between model outputs and measurements is 1.64 when RH = 0 % is assumed as the model dry RH and 1.16 when RH = 40 % is the model dry RH value. The overestimation by the models is believed to originate from the hygroscopicity parameterizations at the lower RH range which may not implement all phenomena taking place (i.e., not fully dried particles and hysteresis effects). This will be particularly relevant when a location is dominated by a deliquescent aerosol such as sea salt. Our results emphasize the need to consider the measurement conditions in such comparisons and recognize that measurements referred to as dry may not be dry in model terms. Recommendations for future model–measurement evaluation and model improvements are provided.

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An aerosol climatology for global models based on the tropospheric aerosol scheme in the Integrated Forecasting System of ECMWF

Cited by 58 publications

References 72 publications

Assessment of the spectral downward irradiance at the surface of the Mediterranean Sea using the radiative Ocean-Atmosphere Spectral Irradiance Model (OASIM)

Assessment of the spectral downward irradiance at the surface of the Mediterranean Sea using the radiative Ocean-Atmosphere Spectral Irradiance Model (OASIM)

Present‐Day and Historical Aerosol and Ozone Characteristics in CNRM CMIP6 Simulations

A global model–measurement evaluation of particle light scattering coefficients at elevated relative humidity

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