P. H. Daum
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View article: Chemical composition and sources of coastal marine aerosol particles during the 2008 VOCALS-REx campaign
Chemical composition and sources of coastal marine aerosol particles during the 2008 VOCALS-REx campaign Open
The chemical composition of aerosol particles (Dp ≤ 1.5 μm) was measured over the southeast Pacific Ocean during the VAMOS (Variability of the American Monsoon Systems) Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-Rex) bet…
View article: Chemical composition and sources of coastal marine aerosol particles during the 2008 VOCALS-REx campaign
Chemical composition and sources of coastal marine aerosol particles during the 2008 VOCALS-REx campaign Open
The chemical composition of aerosol particles (Dp ≤ 1.5 μm) was measured over the southeast Pacific ocean during the VOCALS-REx experiment between 16~October and 15 November 2008 using the US DOE G-1 aircraft. The objective of thes…
View article: Comparison of MODIS cloud microphysical properties with in-situ measurements over the Southeast Pacific
Comparison of MODIS cloud microphysical properties with in-situ measurements over the Southeast Pacific Open
Utilizing the unique characteristics of the cloud over the Southeast Pacific (SEP) off the coast of Chile during the VOCALS field campaign, we compared satellite remote sensing of cloud microphysical properties against in-situ data from mu…
View article: Validation of MODIS cloud microphysical properties with in situ measurements over the Southeast Pacific
Validation of MODIS cloud microphysical properties with in situ measurements over the Southeast Pacific Open
Utilizing the unique characteristics of the cloud over the Southeast Pacific (SEP) off the coast of Chile during the VOCALS field campaign, we validated satellite remote sensing of cloud microphysical properties against in situ data from m…
View article: Aerosol composition, chemistry, and source characterization during the 2008 VOCALS Experiment
Aerosol composition, chemistry, and source characterization during the 2008 VOCALS Experiment Open
Chemical composition of fine aerosol particles over the northern Chilean coastal waters was determined onboard the U.S. DOE G-1 aircraft during the VOCALS (VAMOS Ocean-Cloud-Atmosphere-Land Study) field campaign between October 16 and Nove…
View article: Aerosol concentration and size distribution measured below, in, and above cloud from the DOE G-1 during VOCALS-REx
Aerosol concentration and size distribution measured below, in, and above cloud from the DOE G-1 during VOCALS-REx Open
During the VOCALS Regional Experiment, the DOE G-1 aircraft was used to sample a varying aerosol environment pertinent to properties of stratocumulus clouds over a longitude band extending 800 km west from the Chilean coast at Arica. Trace…
View article: The VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx): goals, platforms, and field operations
The VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx): goals, platforms, and field operations Open
The VAMOS1 Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) was an international field program designed to make observations of poorly understood but critical components of the coupled climate system of the southeast Paci…
View article: The VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx): goals, platforms, and field operations
The VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx): goals, platforms, and field operations Open
The VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) was an international field program designed to make observations of poorly understood but critical components of the coupled climate system of the southeast Pacif…
View article: The time evolution of aerosol size distribution over the Mexico City plateau
The time evolution of aerosol size distribution over the Mexico City plateau Open
As part of the MILAGRO field campaign, the DOE G-1 aircraft was used to make measurements over and downwind of Mexico City with the objective of determining growth characteristics of aerosols from a megacity urban source. This study focuse…
View article: AEROSOL CHEMICAL CHARACTERISTION ON BOARD THE DOE G1 AIRCRAFT USING A PARTICLE INTO LIQUID SAMPLER DURING THE TEXAQS 2000 EXPERIMENT.
AEROSOL CHEMICAL CHARACTERISTION ON BOARD THE DOE G1 AIRCRAFT USING A PARTICLE INTO LIQUID SAMPLER DURING THE TEXAQS 2000 EXPERIMENT. Open
Knowledge of aerosol chemical composition is key to understanding a number of properties of ambient aerosol particles including sources, size/number distribution, chemical evolution, optical properties and human health effects. Although fi…
View article: OZONE PRECURSORS, SOURCE REGIONS, AND O(3) FORMATION DURING THE TEXAQS 2000 STUDY.
OZONE PRECURSORS, SOURCE REGIONS, AND O(3) FORMATION DURING THE TEXAQS 2000 STUDY. Open
The DOE G-1 aircraft made flights on 14 days during the TexAQS 2000 study. On 7 of those days, the aircraft encountered highly localized plumes exhibiting O{sub 3} concentrations in excess of 150 ppb; on some days, peak O{sub 3} concentrat…
View article: The time evolution of aerosol size distribution over the Mexico City plateau
The time evolution of aerosol size distribution over the Mexico City plateau Open
As part of the MILAGRO field campaign, the DOE G-1 aircraft was used to make measurements over and downwind of Mexico City with the objective of determining growth characteristics of aerosols from a megacity urban source. This study focuse…
View article: Aircraft and ground-based measurements of hydroperoxides during the 2006 MILAGRO field campaign
Aircraft and ground-based measurements of hydroperoxides during the 2006 MILAGRO field campaign Open
Mixing ratios of hydrogen peroxide and hydroxymethyl hydroperoxide were determined aboard the US Department of Energy G-1 Research Aircraft during the March, 2006 MILAGRO field campaign in Mexico. Ground measurements of total hydroperoxide…
View article: Effects of model resolution on entrainment (inversion heights), cloud-radiation interactions, and cloud radiative forcing
Effects of model resolution on entrainment (inversion heights), cloud-radiation interactions, and cloud radiative forcing Open
We undertook three-dimensional numerical studies of a marine stratus deck under a strong inversion using an interactive shortwave- and longwave-radiation module. A suite of sensitivity tests were conducted to address the effects of model r…
View article: Effects of aerosol organics on cloud condensation nucleus (CCN) concentration and first indirect aerosol effect
Effects of aerosol organics on cloud condensation nucleus (CCN) concentration and first indirect aerosol effect Open
Aerosol microphysics, chemical composition, and CCN properties were measured on the Department of Energy Gulfstream-1 aircraft during the Marine Stratus/Stratocumulus Experiment (MASE) conducted over the coastal waters between Point Reyes …
View article: Aircraft and ground-based measurements of hydroperoxides during the 2006 MILAGRO field campaign
Aircraft and ground-based measurements of hydroperoxides during the 2006 MILAGRO field campaign Open
Mixing ratios of hydrogen peroxide and hydroxymethyl hydroperoxide were determined aboard the US Department of Energy G-1 Research Aircraft during the March 2006 MILAGRO field campaign in Mexico. Ground measurements of total hydroperoxide …
View article: Use of microphysical relationships to discern growth/decay mechanisms of cloud droplets with focus on Z-LWC relationships.
Use of microphysical relationships to discern growth/decay mechanisms of cloud droplets with focus on Z-LWC relationships. Open
Cloud droplet size distributions hence the key microphysical quantities (e.g., radar reflectivity, droplet concentration, liquid water content, relative dispersion, and mean-volume radius) are determined by different physical mechanisms, i…
View article: The time evolution of aerosol composition over the Mexico City plateau
The time evolution of aerosol composition over the Mexico City plateau Open
The time evolution of aerosol concentration and chemical composition in a megacity urban plume was determined based on 8 flights of the DOE G-1 aircraft in and downwind of Mexico City during the March 2006 MILAGRO field campaign. A series …
View article: The First Aerosol Indirect Effect: Beyond Twomey
The First Aerosol Indirect Effect: Beyond Twomey Open
The traditional first aerosol indirect effect or the Twomey effect involves several fundamental assumptions. Some of the assumptions (e.g., constant liquid water content) are explicitly stated in studies of the Twomey effect whereas others…
View article: The time evolution of aerosol composition over the Mexico City plateau
The time evolution of aerosol composition over the Mexico City plateau Open
The time evolution of aerosol concentration and chemical composition in a megacity urban plume was determined based on 8 flights of the DOE G-1 aircraft in and downwind of Mexico City during the March 2006 MILAGRO field campaign. A series …
View article: A comparative study of O<sub>3</sub> formation in the Houston urban and industrial plumes during the 2000 Texas Air Quality Study
A comparative study of O<sub>3</sub> formation in the Houston urban and industrial plumes during the 2000 Texas Air Quality Study Open
Ozone formation in the Houston area during a period of high ozone concentrations that occurred on 29 August 2000 during the TexAQS 2000 study is examined to understand differences in the sources of O 3 precursors and the rate and efficienc…
View article: Correction to “Ozone production rate and hydrocarbon reactivity in 5 urban areas: A cause of high ozone concentration in Houston”
Correction to “Ozone production rate and hydrocarbon reactivity in 5 urban areas: A cause of high ozone concentration in Houston” Open
[1] A subset of the hydrocarbon samples collected on the DOE G-1 aircraft during the Texas Air Quality Study (TexAQS) has been found to be contaminated. As quantified below, changes to the 5 city comparison presented in the above paper [Kl…
View article: Ozone production rate and hydrocarbon reactivity in 5 urban areas: A cause of high ozone concentration in Houston
Ozone production rate and hydrocarbon reactivity in 5 urban areas: A cause of high ozone concentration in Houston Open
Observations of ozone (O 3 ) and O 3 precursors taken from aircraft flights over Houston, TX, Nashville, TN; New York, NY; Phoenix, AZ, and Philadelphia, PA show that high concentrations of reactive volatile organic compounds (VOCs) in the…
View article: CLOUD PARAMETERIZATIONS, CLOUD PHYSICS, AND THEIR CONNECTIONS: AN OVERVIEW.
CLOUD PARAMETERIZATIONS, CLOUD PHYSICS, AND THEIR CONNECTIONS: AN OVERVIEW. Open
This paper consists of three parts. The first part is concerned with the parameterization of cloud microphysics in climate models. We demonstrate the crucial importance of spectral dispersion of the cloud droplet size distribution in deter…
View article: Measurement of Hydroperoxides During the Texas 2000 Air Quality Study
Measurement of Hydroperoxides During the Texas 2000 Air Quality Study Open
Hydroperoxides are important atmospheric oxidants. They are responsible for most of the oxidation of aqueous-phase SO{sub 2} to sulfate in the northeastern United States, resulting in the formation of acid precipitation and visibility-redu…
View article: OZONE PRODUCTION IN THE PHILADELPHIA URBAN AREA DURING NE-OPS 99
OZONE PRODUCTION IN THE PHILADELPHIA URBAN AREA DURING NE-OPS 99 Open
As part of the 1999 NARSTO Northeast Oxidant and Particulate Study (NE-OPS) field campaign, the DOE G-1 aircraft sampled trace gases and aerosols in and around the Philadelphia metropolitan area. Twenty research flights were conducted betw…
View article: NO<sub><i>y</i></sub> lifetimes and O<sub>3</sub> production efficiencies in urban and power plant plumes: Analysis of field data
NO<sub><i>y</i></sub> lifetimes and O<sub>3</sub> production efficiencies in urban and power plant plumes: Analysis of field data Open
In an effort to describe and characterize power plant plumes in the Nashville region, emissions from a small power plant (Gallatin) and a large power plant (Paradise) were examined using data obtained on the Department of Energy G‐1 airbor…
View article: Analysis of the processing of Nashville urban emissions on July 3 and July 18, 1995
Analysis of the processing of Nashville urban emissions on July 3 and July 18, 1995 Open
This paper analyzes data obtained on July 3 and 18, 1995, during the summer 1995 Southern Oxidant Study (SOS) field campaign. In a previous paper [ Nunnermacker et al ., 1998] we analyzed measurements of key species that contribute to form…
View article: Analysis of O<sub>3</sub> formation during a stagnation episode in central Tennessee in summer 1995
Analysis of O<sub>3</sub> formation during a stagnation episode in central Tennessee in summer 1995 Open
O 3 production in the Nashville urban plume during the O 3 episode that occurred on July 11–July 13 1995, is examined to characterize the factors that control the ozone production rate and efficiency, and to examine the relative importance…