The Geostationary Earth Radiation Budget Project

Harries, J. E.; Russell, Jill; Hanafin, J. A.; Brindley, Helen E.; Futyan, J. M.; Rufus, J.; Kellock, S.; Matthews, Grant; Wrigley, R.; Mueller, Johannes; Mossavati, R.; Ashmall, J.; Sawyer, Eric; Parker, D. E.; Caldwell, M.; Allan, P. M.; Smith, A. W.; Bates, M. J.; Coan, B.; Stewart, B. C.; Lepine, D. R.; Cornwall, L.; Corney, D. R.; Ricketts, M. J.; Drummond, D.; Smart, D. F.; Cutler, R.; Dewitte, Steven; Clerbaux, Nicolas; Gonzalez, L.; Ipe, A.; Bertrand, Cédric; Joukoff, A.; Crommelynck, D.; Nelms, Nick; Llewellyn‐Jones, David; Butcher, Gillian; Smith, G. Louis; Szewczyk, Z. Peter; Mlynczak, P. E.; Slingo, A.; Allan, Richard P.; Ringer, Mark A.

doi:10.1175/bams-86-7-945

Cited by 210 publications

(158 citation statements)

References 37 publications

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“…2a). When compared to observations of OLR from the Geostationary Earth Radiation Budget (GERB; Harries et al, 2005) over the same region and period, CONGO-THOM represents warm cloud more consistently with GERB than CONGO-MORR, despite overpredicting colder cloud somewhat, while CONGO-MORR overpredicts higher cloud and underpredicts warm cloud compared to the observations (Fig. 2a).…”

Section: Wrf Congo Basinmentioning

confidence: 81%

Uncertainty from the choice of microphysics scheme in convection-permitting models significantly exceeds aerosol effects

White

Gryspeerdt²,

Stier

et al. 2017

Atmos. Chem. Phys.

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Abstract. This study investigates the hydrometeor development and response to cloud droplet number concentration (CDNC) perturbations in convection-permitting model configurations. We present results from a real-data simulation of deep convection in the Congo basin, an idealised supercell case, and a warm-rain large-eddy simulation (LES). In each case we compare two frequently used double-moment bulk microphysics schemes and investigate the response to CDNC perturbations. We find that the variability among the two schemes, including the response to aerosol, differs widely between these cases. In all cases, differences in the simulated cloud morphology and precipitation are found to be significantly greater between the microphysics schemes than due to CDNC perturbations within each scheme. Further, we show that the response of the hydrometeors to CDNC perturbations differs strongly not only between microphysics schemes, but the inter-scheme variability also differs between cases of convection. Sensitivity tests show that the representation of autoconversion is the dominant factor that drives differences in rain production between the microphysics schemes in the idealised precipitating shallow cumulus case and in a subregion of the Congo basin simulations dominated by liquidphase processes. In this region, rain mass is also shown to be relatively insensitive to the radiative effects of an overlying layer of ice-phase cloud. The conversion of cloud ice to snow is the process responsible for differences in cold cloud bias between the schemes in the Congo. In the idealised supercell case, thermodynamic impacts on the storm system using different microphysics parameterisations can equal those due to aerosol effects. These results highlight the large uncertainty in cloud and precipitation responses to aerosol in convectionpermitting simulations and have important implications not only for process studies of aerosol-convection interaction, but also for global modelling studies of aerosol indirect effects. These results indicate the continuing need for tighter observational constraints of cloud processes and response to aerosol in a range of meteorological regimes.

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Section: Wrf Congo Basinmentioning

confidence: 81%

Uncertainty from the choice of microphysics scheme in convection-permitting models significantly exceeds aerosol effects

White

Gryspeerdt²,

Stier

et al. 2017

Atmos. Chem. Phys.

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“…This project highlighted a large discrepancy in the clear-sky outgoing LW radiation (OLRc) over the Sahara Desert, which reaches a maximum during the June-July-August period each year (Haywood et al, 2005). An example of the OLRc anomaly is shown in Figure 1 when comparing the MetUM to both the Meteosat-7 narrow band and preliminary measurements from the first Geostationary Earth Radiation Budget Experiment (GERB) instrument (Harries et al, 2005) onboard Meteosat-8.…”

Section: Motivation and Rationale For The Experimentsmentioning

confidence: 99%

Motivation, rationale and key results from the GERBILS Saharan dust measurement campaign

Haywood

Johnson

Osborne

et al. 2011

Quart J Royal Meteoro Soc

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The Geostationary Earth Radiation Budget Intercomparison of Longwave and Shortwave radiation (GERBILS) was an observational field experiment over NorthAfrica during June 2007. The campaign involved 10 flights by the FAAM BAe-146 research aircraft over southwestern parts of the Sahara Desert and coastal stretches of the Atlantic Ocean. Objectives of the GERBILS campaign included characterisation of mineral dust geographic distribution and physical and optical properties, assessment of the impact upon radiation, validation of satellite remote sensing retrievals, and validation of numerical weather prediction model forecasts of aerosol optical depths (AODs) and size distributions. We provide the motivation behind GERBILS and the experimental design and report the progress made in each of the objectives. We show that mineral dust in the region is relatively nonabsorbing (mean single scattering albedo at 550 nm of 0.97) owing to the relatively small fraction of iron oxides present (1-3%), and that detailed spectral radiances are most accurately modelled using irregularly shaped particles. Satellite retrievals over bright desert surfaces are challenging owing to the lack of spectral contrast between the dust and the underlying surface. However, new techniques have been developed which are shown to be in relatively good agreement with AERONET estimates of AOD and with each other. This encouraging result enables relatively robust validation of numerical models which treat the production, transport, and deposition of mineral dust. The dust models themselves are able to represent largescale synoptically driven dust events to a reasonable degree, but some deficiencies remain both in the Sahara and over the Sahelian region, where cold pool outflow from convective cells associated with the intertropical convergence zone can lead to significant dust production.

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“…Over the Meteosat Field Of View (FOV), broadband observations of the TRS and TET fluxes are available since 2004 from the Geostationary Earth Radiation Budget (GERB, [1]) instruments on-board the Meteosat Second Generation (MSG) satellites. Currently, GERB Edition-1 instantaneous fluxes are generated [2] and made available to the users' community.…”

Section: Introductionmentioning

confidence: 99%

The CM SAF TOA Radiation Data Record Using MVIRI and SEVIRI

et al. 2017

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Abstract:The CM SAF Top of Atmosphere (TOA) Radiation MVIRI/SEVIRI Data Record provides a homogenised satellite-based climatology of TOA Reflected Solar (TRS) and Emitted Thermal (TET) radiation in all-sky conditions over the Meteosat field of view. The continuous monitoring of these two components of the Earth Radiation Budget is of prime importance to study climate variability and change. Combining the Meteosat MVIRI and SEVIRI instruments allows an unprecedented temporal (30 min/15 min) and spatial (2.5 km/3 km) resolution compared to, e.g., the CERES products. It also opens the door to the generation of a long data record covering a 32 years time period and extending from 1 February 1983 to 30 April 2015. The retrieval method used to process the CM SAF TOA Radiation MVIRI/SEVIRI Data Record is discussed. The overlap between the MVIRI and GERB instruments in the period 2004-2006 is used to derive empirical narrowband to broadband regressions. The CERES TRMM angular dependency models and theoretical models are respectively used to compute the TRS and TET fluxes from the broadband radiances. The TOA radiation products are issued as daily means, monthly means and monthly averages of the hourly integrated values (diurnal cycle). The data is provided on a regular grid at a spatial resolution of 0.05 degrees and covers the region 70 • N-70 • S and 70 • W-70 • E. The quality of the data record has been evaluated by intercomparison with several references. In general, the stability in time of the data record is found better than 4 Wm −2 and most products fulfill the predefined accuracy requirements.

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The Geostationary Earth Radiation Budget Project

Abstract: A new instrument, GERB, is now operating on the European Meteosat-8 spacecraft, making unique, accurate, high-time-resolution measurements of the Earth's radiation budget for atmospheric physics and climate studies.

Cited by 210 publications

References 37 publications

Uncertainty from the choice of microphysics scheme in convection-permitting models significantly exceeds aerosol effects

Uncertainty from the choice of microphysics scheme in convection-permitting models significantly exceeds aerosol effects

Motivation, rationale and key results from the GERBILS Saharan dust measurement campaign

The CM SAF TOA Radiation Data Record Using MVIRI and SEVIRI

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