ACP - Special issue
Atmospheric inversion of SO2 and primary aerosol emissions for the year 2010
Atmos. Chem. Phys., 13, 6555-6573, 2013
Combined assimilation of IASI and MLS observations to constrain tropospheric and stratospheric ozone in a global chemical transport model
Atmos. Chem. Phys., 14, 177-198, 2014
Comparing ECMWF AOD with AERONET observations at visible and UV wavelengths
Atmos. Chem. Phys., 14, 593-608, 2014
Regional scale ozone data assimilation using an ensemble Kalman filter and the CHIMERE chemical transport model
Geosci. Model Dev., 7, 283-302, 2014
Impacts of increasing the aerosol complexity in the Met Office global numerical weather prediction model
Atmos. Chem. Phys., 14, 4749-4778, 2014
Global mass fixer algorithms for conservative tracer transport in the ECMWF model
Geosci. Model Dev., 7, 965-979, 2014
Assimilation of atmospheric methane products into the MACC-II system: from SCIAMACHY to TANSO and IASI
Atmos. Chem. Phys., 14, 6139-6158, 2014
Environmental influences on the intensity changes of tropical cyclones over the western North Pacific
Atmos. Chem. Phys., 14, 6329-6342, 2014
Tropospheric column amount of ozone retrieved from SCIAMACHY limb–nadir-matching observations
Atmos. Meas. Tech., 7, 2073-2096, 2014
Decoupling the effects of clear atmosphere and clouds to simplify calculations of the broadband solar irradiance at ground level
Geosci. Model Dev., 7, 1661-1669, 2014
Improved retrieval of direct and diffuse downwelling surface shortwave flux in cloudless atmosphere using dynamic estimates of aerosol content and type: application to the LSA-SAF project
Atmos. Chem. Phys., 14, 8209-8232, 2014
On the wintertime low bias of Northern Hemisphere carbon monoxide found in global model simulations
Atmos. Chem. Phys., 14, 9295-9316, 2014
Global data set of biogenic VOC emissions calculated by the MEGAN model over the last 30 years
Atmos. Chem. Phys., 14, 9317-9341, 2014
Corrigendum to "Decoupling the effects of clear atmosphere and clouds to simplify calculations of the broadband solar irradiance at ground level" published in Geosci. Model Dev., 7, 1661–1669, 2014
Geosci. Model Dev., 7, 2409-2409, 2014
TNO-MACC_II emission inventory; a multi-year (2003–2009) consistent high-resolution European emission inventory for air quality modelling
Atmos. Chem. Phys., 14, 10963-10976, 2014
Forecasting global atmospheric CO2
Summary: This paper presents a new operational CO2 forecast product as part of the Copernicus Atmospheric Services suite of atmospheric composition products, using the state-of-the-art numerical weather prediction model from the European Centre of Medium-Range Weather Forecasts. The evaluation with independent observations shows that the forecast has skill in predicting the synoptic variability of CO2. The online simulation of CO2 fluxes from vegetation contributes to this skill.
Atmos. Chem. Phys., 14, 11959-11983, 2014
Improving HelioClim-3 estimates of surface solar irradiance using the McClear clear-sky model and recent advances in atmosphere composition
Summary: The HelioClim-3 database (HC3v3) provides records of surface solar irradiation every 15 min estimated by processing images from the geostationary meteorological Meteosat satellites using climatological data sets of atmospheric properties. A method is proposed to improve a posteriori HC3v3 by combining it with data records of advanced global aerosol property forecasts and physically consistent total column content in water vapour and ozone produced by the MACC projects.
Atmos. Meas. Tech., 7, 3927-3933, 2014
Sensitivity of simulated CO2 concentration to regridding of global fossil fuel CO2 emissions
Geosci. Model Dev., 7, 2867-2874, 2014
Daily global fire radiative power fields estimation from one or two MODIS instruments
Summary: This paper describes a method to correct the bias in daily fire radiative power (FRP) observations from any low Earth orbit satellite, so that that the budget of daily smoke emissions remains independent of the number of satellites from which FRP observations are taken into account. This ensures the possibility of running a system assimilating observations from several sensors, e.g. the Global Fire Assimilation System (GFAS), in case of failure of one of the MODIS instruments.
Atmos. Chem. Phys., 14, 13377-13390, 2014
Inverse modelling of CH4 emissions for 2010–2011 using different satellite retrieval products from GOSAT and SCIAMACHY
Atmos. Chem. Phys., 15, 113-133, 2015
Recent satellite-based trends of tropospheric nitrogen dioxide over large urban agglomerations worldwide
Summary: We use a homogeneous 10-year record of satellite data to study recent trends in NO2 over the world's major urban agglomerations. The results indicate distinct spatial patterns in trends, with moderate but consistent reductions in NO2 throughout most developed countries and rapid increases of up to 15 % per year over many sites in Asia, Africa, and South America. We also show links between urban NO2 trends and economic as well as demographic factors, and how the latter drive regional differences.
Atmos. Chem. Phys., 15, 1205-1220, 2015
Assimilation of surface NO2 and O3 observations into the SILAM chemistry transport model
Geosci. Model Dev., 8, 191-203, 2015
Copernicus stratospheric ozone service, 2009–2012: validation, system intercomparison and roles of input data sets
Summary: We validate and discuss the analyses of stratospheric ozone delivered in near-real time between 2009 and 2012 by four different data assimilation systems: IFS-MOZART, BASCOE, SACADA and TM3DAM. It is shown that the characteristics of the assimilation systems are much less important than those of the assimilated data sets. A correct representation of the vertical distribution of ozone requires satellite observations which are well resolved vertically and extend into the lowermost stratosphere.
Atmos. Chem. Phys., 15, 2269-2293, 2015
Description of algorithms for co-locating and comparing gridded model data with remote-sensing observations
Geosci. Model Dev., 8, 911-921, 2015
Tropospheric chemistry in the Integrated Forecasting System of ECMWF
Summary: We describe modules for atmospheric chemistry, wet and dry deposition and lightning NO production, which have been newly introduced in ECMWF's weather forecasting model. With that model, we want to forecast global air pollution as part of the European Copernicus Atmosphere Monitoring Service. We show that the new model results compare as well or better with in situ and satellite observations of ozone, CO, NO2, SO2 and formaldehyde as the previous model.
Geosci. Model Dev., 8, 975-1003, 2015
The MACC-II 2007–2008 reanalysis: atmospheric dust evaluation and characterization over northern Africa and the Middle East
Summary: Atmospheric mineral dust from a MACC-II short reanalysis (2007-2008) has been evaluated over northern Africa and the Middle East using satellite aerosol products, AERONET data, in situ PM10 concentrations, and extinction vertical profiles. The MACC-II AOD spatial and temporal variability shows good agreement with satellite sensors and AERONET. We find a good agreement in averaged extinction vertical profiles between MACC-II and lidars. MACC correctly reproduces daily to interannual PM10.
Atmos. Chem. Phys., 15, 3991-4024, 2015
Data assimilation of satellite-retrieved ozone, carbon monoxide and nitrogen dioxide with ECMWF's Composition-IFS
Summary: The paper presents results from data assimilation studies with the new Composition-IFS model developed in the MACC project. This system was used in MACC to produce daily analyses and 5-day forecasts of atmospheric composition and is now run daily in the EU’s Copernicus Atmosphere Monitoring Service. The paper looks at the quality of the CO, O3 and NO2 analysis fields obtained with this system, comparing them against observations, a control run and an older version of the model.
Atmos. Chem. Phys., 15, 5275-5303, 2015
MACC regional multi-model ensemble simulations of birch pollen dispersion in Europe
Summary: The paper presents the first ensemble modelling experiment for forecasting the atmospheric dispersion of birch pollen in Europe. The study included 7 models of MACC-ENS tested over the season of 2010 and applied for 2013 in forecasting and reanalysis modes. The results were compared with observations in 11 countries, members of European Aeroallergen Network. The models successfully reproduced the timing of the unusually late season of 2013 but had more difficulties with absolute concentration.
Atmos. Chem. Phys., 15, 8115-8130, 2015
On the ability of a global atmospheric inversion to constrain variations of CO2 fluxes over Amazonia
Atmos. Chem. Phys., 15, 8423-8438, 2015
Evaluation of near-surface ozone over Europe from the MACC reanalysis
Summary: This work is an extended evaluation of near-surface ozone as part of the global reanalysis of atmospheric composition, produced within the European-funded project MACC (Monitoring Atmospheric Composition and Climate). It includes an evaluation over the period 2003-2012 and provides an overall assessment of the modelling system performance with respect to near surface ozone for specific European subregions.
Geosci. Model Dev., 8, 2299-2314, 2015
Extended and refined multi sensor reanalysis of total ozone for the period 1970–2012
Summary: The ozone multi-sensor reanalysis (MSR2) is a multi-decadal ozone column analysis for the period 1970-2012 based on all available ozone column satellite datasets, surface Brewer-Dobson observations and a data assimilation technique with detailed error modelling. The latest total ozone retrievals of 15 different satellite instruments are used: BUV-Nimbus4, TOMS-Nimbus7, TOMS-EP, SBUV-7, -9, -11, -14, -16, -17, -18, -19, GOME, SCIAMACHY, OMI and GOME-2.
Atmos. Meas. Tech., 8, 3021-3035, 2015
Using SEVIRI fire observations to drive smoke plumes in the CMAQ air quality model: a case study over Antalya in 2008
Summary: We investigate the quality of fire emission estimates derived from SEVIRI FRP for air quality simulations with the Community Multiscale Air Quality (CMAQ) model, by comparing them with available MODIS FRP-based ones. We demonstrate that geostationary observations allow for refining biomass burning emissions, which can subsequently be used in regional scale air quality models in order to improve the prediction of chemical composition of the atmosphere in presence of large fire episodes.
Atmos. Chem. Phys., 15, 8539-8558, 2015
New fire diurnal cycle characterizations to improve fire radiative energy assessments made from MODIS observations
Summary: The polar orbiting MODIS instruments provide four daily observations of the fire diurnal cycle, resulting in erroneous fire radiative energy (FRE) estimates. Using geostationary SEVIRI data, we explore the fire diurnal cycle and its drivers for Africa to develop a new method to estimate global FRE in near real-time using MODIS. The fire diurnal cycle varied with climate and vegetation type, and including information on the fire diurnal cycle in the model significantly improved the FRE estimates.
Atmos. Chem. Phys., 15, 8831-8846, 2015
A regional air quality forecasting system over Europe: the MACC-II daily ensemble production
Summary: This paper describes the air quality forecasting system over Europe put in place in the Monitoring Atmospheric Composition and Climate projects. It provides daily and 4-day forecasts and analyses for the previous day for major gas and particulate pollutants and their main precursors. These products are based on a multi-model approach using seven state-of-the-art models developed in Europe. An evaluation of the performance of the system is discussed in the paper.
Geosci. Model Dev., 8, 2777-2813, 2015
CALIOP near-real-time backscatter products compared to EARLINET data
Summary: The expedited near-real-time Level 1.5 Cloud-Aerosol Lidar with Orthogonal Polarization version 3 products were evaluated against data from the ground-based European Aerosol Research Lidar Network. The statistical framework and results of the 3-year evaluation of 48 CALIOP overpasses with ground tracks within a 100km distance from operating EARLINET stations are presented.
Atmos. Chem. Phys., 15, 12179-12191, 2015
Validation of reactive gases and aerosols in the MACC global analysis and forecast system
Summary: The MACC project is preparing the operational atmosphere service of the European Copernicus Programme, and uses data assimilation to combine atmospheric models with available observations. Our paper provides an overview of the aerosol and trace gas validation activity of MACC. Topics are the validation requirements, the measurement data, the assimilation systems, the upgrade procedure, operational aspects and the scoring methods. A summary is provided of recent results, including special events.
Geosci. Model Dev., 8, 3523-3543, 2015
A multi-year study of lower tropospheric aerosol variability and systematic relationships from four North American regions
Summary: Variability in aerosol optical properties relevant to radiative forcing were studied on several timescales at four continental North American NOAA-ESRL sites. Light scattering and intensive properties varied most on seasonal scales while absorption variability on weekly and diurnal timescales was comparable to its seasonal variability. Large reductions in light scattering were observed at the two long-term sites (relative to late 1990s), along with a smaller contribution by sub-1µm particles.
Atmos. Chem. Phys., 15, 12487-12517, 2015
Feedbacks of dust and boundary layer meteorology during a dust storm in the eastern Mediterranean
Summary: In this paper we report on the feedbacks between dust and boundary layer meteorology during a dust storm over Egypt and Libya in April 2012, using an atmospheric composition forecasting system. Dust was found to act on atmospheric stability, leading to an increase (night) or a decrease (day) in dust production. Horizontal gradients of temperature were modified by the radiative impact of the dust layer, leading to changes in wind patterns at the edge of the storm due to the thermal wind effect.
Atmos. Chem. Phys., 15, 12909-12933, 2015