Guy P. Brasseur

Guy P. Brasseur
Max Planck Institute for Meteorology | MPIMET · Environmental Modeling

Doctor in Applied Sciences

About

419
Publications
38,209
Reads
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23,290
Citations
Additional affiliations
July 2009 - June 2014
Helmholtz-Zentrum Hereon
Position
  • Managing Director
January 2006 - June 2009
National Center for Atmospheric Research
Position
  • Managing Director
January 2000 - June 2006
Max Planck Institute for Meteorology
Position
  • Managing Director

Publications

Publications (419)
Preprint
The AQ-WATCH (Air Quality: Worldwide Analysis and Forecasting of Atmospheric Composition for Health) project, supported by the European Commission, is developing seven innovative products and services for improving air quality forecasts and attributing chemical sources. These prototypes are based on existing space and in-situ observations of air qu...
Article
Full-text available
This study assesses the quality of carbon monoxide (CO) simulations from the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) and analyzes different processes controlling CO distribution in Africa. Sixteen CO tracers are implemented in WRF-Chem to track CO from different sources and regions. The model captures the seasonal c...
Article
Full-text available
In the atmospheric boundary layer that is affected by turbulent motions and inhomogeneous surface chemical emissions, short-lived reactive species may not be completely mixed within any given airmass. Coarse atmospheric models, which assume complete mixing within each grid-box, may overestimate the rates at which chemical species react. We used a l...
Article
Full-text available
Using the CAM-chem Model, we simulate the response of chemical species in the free troposphere to scenarios of primary pollutant emission reductions during the COVID-19 pandemic. Zonally averaged ozone in the free troposphere during Northern Hemisphere spring and summer is found to be 5%–15% lower than 19-yr climatological values, in good agreement...
Article
Full-text available
In order to fight the spread of the global COVID-19 pandemic, most of the world's countries have taken control measures such as lockdowns during a few weeks to a few months. These lockdowns had significant impacts on economic and personal activities in many countries. Several studies using satellite and surface observations have reported important...
Article
Full-text available
China was the first country to undergo large-scale lockdowns in response to the pandemic in early 2020 and a progressive return to normalization after April 2020. Spaceborne observations of atmospheric nitrogen dioxide (NO2) and oxygenated volatile organic compounds (OVOCs), including formaldehyde (HCHO), glyoxal (CHOCHO), and peroxyacetyl nitrate...
Article
Full-text available
Plain Language Summary Advances in fundamental knowledge and the availability of frontier technologies to observe and simulate the atmosphere have enabled the development of comprehensive chemical weather forecast systems at the global, regional, and local scales. Such prediction capability can play a decisive role in mitigating the exposure of the...
Article
Full-text available
The lockdown period (March–May 2020) during the COVID‐19 pandemic in Europe led to a reduction in the anthropogenic emissions of primary pollutants. For three‐quarters of over 1,100 available monitoring stations, the average nitrogen dioxide (NO2) concentrations decreased by at least 2.7 μg·m−3 (or 25%) compared with the average concentrations reco...
Article
Full-text available
Ozone (O3) is a key oxidant and pollutant in the lower atmosphere. Significant increases in surface O3 have been reported in many cities during the COVID-19 lockdown. Here we conduct comprehensive observation and modeling analyses of surface O3 across China for periods before and during the lockdown. We find that daytime O3 decreased in the subtrop...
Article
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We use the global Community Earth System Model to investigate the response of secondary pollutants (ozone O3, secondary organic aerosols SOA) in different parts of the world in response to modified emissions of primary pollutants during the COVID-19 pandemic. We quantify the respective effects of the reductions in NOx and in volatile organic carbon...
Article
Full-text available
p>Global and regional chemical transport models of the atmosphere are based on the assumption that chemical species are completely mixed within each model grid box. However, in reality, these species are often segregated due to localized sources and the influence of topography. In order to investigate the degree to which the rates of chemical react...
Article
Full-text available
We employed direct numerical simulations to estimate the error on chemical calculation in simulations with regional chemical-transport models induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in an urban boundary layer with strong and heterogeneously distributed surface emissions. In simulations of initially seg...
Preprint
Full-text available
In order to fight the spread of the global COVID-19 pandemic, most of the world countries have taken control measures such as lockdowns during a few weeks to a few months. These lockdowns had significant impacts on economic and personal activities in many countries. Several studies using satellite and surface observations have reported important ch...
Preprint
Full-text available
Global and regional chemical transport models of the atmosphere are based on the assumption that chemical species are completely mixed within each model grid box. However, in reality, these species are often segregated due to localized sources and the influence of the topography. In order to investigate the degree to which the rates of chemical rea...
Article
To explore the various couplings across space and time and between ecosystems in a consistent manner, atmospheric modeling is moving away from the fractured limited-scale modeling strategy of the past toward a unification of the range of scales inherent in the Earth system. This paper describes the forward-looking Multi-Scale Infrastructure for Che...
Article
Full-text available
The Copernicus Atmosphere Monitoring Service (CAMS) operated by the European Centre for Medium-Range Weather Forecasts (ECMWF) has produced a global reanalysis of aerosol and reactive gases (called CAMSRA) for the period 2003–2016. Space observations of ozone, carbon monoxide, NO2 and aerosol optical depth are assimilated by a 4D-Var method in the...
Preprint
Full-text available
The Copernicus Atmosphere Monitoring Service (CAMS) operated by the European Centre for Medium Range Weather Forecasts (ECMWF) has produced a global reanalysis of aerosol and reactive gases (called CAMSRA) for the period 2003–2016. Space observations of ozone, carbon monoxide, NO2 and aerosol optical depth are assimilated by a 4-D Var method in the...
Article
Full-text available
Peer review is one of the most important professional activities for scientists, because it ensures the quality of science that is shared with colleagues and with the world. Reviewers generously donate their time and effort with the knowledge that are key to sustaining scientific rigor. Earth's Future is fortunate to engage excellent reviewers that...
Article
Full-text available
An operational multimodel forecasting system for air quality has been developed to provide air quality services for urban areas of China. The initial forecasting system included seven state-of-the-art computational models developed and executed in Europe and China (CHIMERE, IFS, EMEP MSC-W, WRF-Chem-MPIM, WRF-Chem-SMS, LOTOS-EUROS, and SILAMtest)....
Article
Full-text available
The effects of the 11-year, quasi-biennial, and 27-day cycles of solar activity on dynamical processes in the atmosphere are studied using empirical data and results of numerical model calculations. Estimates of changes during the 11-year solar cycle in the wind velocity, potential vorticity, geopotential and its large-scale zonal harmonics are obt...
Article
Full-text available
An operational multi-model forecasting system for air quality including nine different chemical transport models has been developed and provides daily forecasts of ozone, nitrogen oxides, and particulate matter for the 37 largest urban areas of China (population higher than 3 million in 2010). These individual forecasts as well as the mean and medi...
Article
Full-text available
An operational multi-model forecasting system for air quality has been developed to provide air quality services for urban areas of China. The initial forecasting system included seven state-of-the-art computational models developed and executed in Europe and China (CHIMERE, IFS, EMEP MSC-W, WRF-Chem-MPIM, WRF-Chem-SMS, LOTOS-EUROS and SILAMtest)....
Article
Full-text available
An operational multi-model forecasting system for air quality including 9 different chemical transport models has been developed and is providing daily forecasts of ozone, nitrogen oxides, and particulate matter for the 37 largest urban areas of China (population higher than 3 million in 2010). These individual forecasts as well as the mean and med...
Article
Full-text available
The Weather Research and Forecasting-Chemistry (WRF-Chem) model was used to develop an operational air quality forecast system for the Metropolitan Area of Lima-Callao (MALC), Peru, that is affected by high particulate matter concentrations episodes. In this work, we describe the implementation of an operational air quality-forecasting platform to...
Article
Full-text available
The Weather Research and Forecasting-Chemistry (WRF-Chem) model was used to develop an operational air quality forecast system for the Metropolitan Area of Lima-Callao (MALC), Peru, that is affected by high particulate matter concentrations episodes. In this work, we describe the implementation of an operational air quality-forecasting platform to...
Chapter
Air quality forecast systems are being developed and used in many regions of the world to provide alerts on unhealthy situations. We present in this chapter an ensemble modeling system for air quality prediction in East Asia. The system includes several chemistry transport models that provide prediction of levels of ozone (O3), particulate matter (...
Chapter
The surface concentrations of PM2.5 measured by the Chinese National Environmental Monitoring Center (CNEMC) and the aerosol optical depth (AOD) observed by the Moderate-Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua satellite are used to study the spatial and temporal variations of aerosol pollution in eastern China. A solar radiatio...
Chapter
Air pollution is a growing major environmental concern in South Asia owing to rapid economic growth and expansion of urban, industrial, power generation and traffic sectors. This problem is widely recognized by the national and international community and many efforts have been made in the past 25 years to gain insight into the causes of this probl...
Article
In order to limit global warming to Paris Agreement goal levels, climate engineering should be considered as a viable solution.
Book
This book, written by an international group of experts from China, Europe and the USA, presents a broad and comprehensive analysis of the chemical and meteorological processes responsible for the formation of air pollutants in eastern Asia, and in particular for the development of severe pollution episodes observed primarily during winter in the n...
Book
Mathematical modeling of atmospheric composition is a formidable scientific and computational challenge. This comprehensive presentation of the modeling methods used in atmospheric chemistry focuses on both theory and practice, from the fundamental principles behind models, through to their applications in interpreting observations. An encyclopaedi...
Article
Two state-of-the-art models (deterministic: Weather Research and Forecast model with Chemistry (WRF-Chem) and statistic: Artificial Neural Networks: (ANN)) are implemented to predict the ground-level ozone concentration in São Paulo (SP), Brazil. Two domains are set up for WRF-Chem simulations: a coarse domain (with 50 km horizontal resolution) inc...
Article
The scale of the decarbonisation challenge to meet the Paris Agreement is underplayed in the public arena. It will require precipitous emissions reductions within 40 years and a new carbon sink on the scale of the ocean sink. Even then, the world is extremely likely to overshoot. A catastrophic failure of policy, for example, waiting another decade...
Article
Full-text available
The increasing severity of droughts/floods and worsening air quality from increasing aerosols in Asia monsoon regions are the two gravest threats facing over 60% of the world population living in Asian monsoon regions. These dual threats have fueled a large body of research in the last decade on the roles of aerosols in impacting Asian monsoon weat...
Article
Full-text available
The scale of the decarbonisation challenge to meet the Paris Agreement is underplayed in the public arena. It will require precipitous emission reductions and a new carbon sink on the scale of the ocean sink within 40 years. Even then, the world is extremely likely to overshoot. A catastrophic failure of policy, for example waiting another decade f...
Article
Full-text available
Under the Federal Aviation Administration’s (FAA) Aviation Climate Change Research Initiative (ACCRI), non-CO2 climatic impacts of commercial aviation are assessed for current (2006) and for future (2050) baseline and mitigation scenarios. The effects of the non-CO2 aircraft emissions are examined using a number of advanced climate and atmospheric...
Article
Full-text available
This perspective paper reviews progress made in the last decades to enhance the communication and use of climate information relevant to the political and economic decision process. It focuses, specifically, on the creation and development of climate services, and highlights a number of difficulties that have limited the success of these services....
Code
SOCRATES is a 2-D Global Chemistry-Climate Model (GCCM) of the Earth atmosphere, covering -85 degrees South to 85 degrees North by 5 degrees latitude and from surface to 120km log-p altitude. It was developed originally at NCAR (PI: Guy Brasseur). This is a forked version developed at BIRA-IASB from 1997 until 2003 to study the Mesosphere - Lower T...
Article
Full-text available
Current and future climate impacts of aviation emissions are quantified using a combination of atmospheric models, surface and satellite observations and laboratory experiments.
Article
Adaptation to climate change has risen up the political agenda in recent years, as the realization that we are committed to at least some level of climate change over the next few decades has been acknowledged. It is also the case that a range of different economic sectors, both public and private, increasingly recognize the need for, and importanc...
Article
Full-text available
The development of human civilisations has occurred at a time of stable climate. This climate stability is now threatened by human activity. The rising global climate risk occurs at a decisive moment for world development. World nations are currently discussing a global development agenda consequent to the Millennium Development Goals (MDGs), which...
Article
Full-text available
This study examines the effect of a typical pre-monsoon season dust storm on tropospheric chemistry through a case study in northern India. Dust can alter photolysis rates by scattering and absorbing solar radiation and provide surface area for heterogeneous reactions. We use the Weather Research and Forecasting model coupled with Chemistry (WRF-Ch...
Conference Paper
Full-text available
Annotation. Analysis is presented of the effects of the 27-day solar cycle on atmospheric dynamics as simulated by the three-dimensional chemistry-climate model HAMMONIA. The response to solar forcing produced by the model exhibits variations with periods of about 27 days in zonal mean geopotential and in the amplitudes of the 1st and 5th zonal har...
Article
Full-text available
The impact of a typical pre-monsoon season (April-June) dust storm event on the regional aerosol optical properties and radiation budget in northern India is analyzed. The dust storm event lasted from 17 to 22 April 2010 and the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) estimated total dust emissions of 7.5 Tg over th...
Article
Full-text available
This study examines the effect of a typical pre-monsoon season dust storm on tropospheric chemistry through a case study in northern India. Dust can alter photolysis rates by scattering and absorbing solar radiation, and provide surface area for heterogeneous reactions. We use the Weather Research and Forecasting model coupled with Chemistry (WRF-C...
Article
Full-text available
Earth's Future will explore and foster interactions among the Earth and environmental sciences, ecology, economics, the health and social sciences, and more. Its mission is to focus on the Earth as an interactive, evolving system to help researchers, policy makers and the public navigate the science.
Article
[1] One of the significant uncertainties in understanding the effects of aviation on climate is the effects of aviation emissions on ozone and atmospheric chemistry. In this study the effects of aviation emissions on atmospheric ozone for 2006 and two projections for 2050 are compared among seven models. The models range in complexity from a two-di...
Article
Full-text available
Adaptation requires science that analyzes decisions, identifies vulnerabilities, improves foresight, and develops options.