Getting a Better Estimate of an Atmospheric Radical

  title={Getting a Better Estimate of an Atmospheric Radical},
  author={I. S. A. Isaksen and Stig B. Dals{\o}ren},
  pages={38 - 39}
Better measures of how global levels of OH vary from year to year will improve climate science. The hydroxyl radical (OH) is an oxidizing molecule that has a major impact on the distribution and concentrations of pollutants and greenhouse gases in Earth's atmosphere. It is the most common oxidant in the troposphere, the lowest portion of the atmosphere. Understanding OH variability is important to evaluating human impacts on the atmosphere and climate. Measuring global OH distribution and… 

Uncertainties in isoprene photochemistry and emissions: implications for the oxidative capacity of past and present atmospheres and for climate forcing agents

Abstract. Isoprene and its oxidation products are major players in the oxidative chemistry of the troposphere. Current understanding of the factors controlling biogenic isoprene emissions and of the

Aqueous production of oxygen atoms from hydroxyl radicals.

Details of the reactions and interactions that can occur between two OH* in water are probed by utilizing Car-Parrinello molecular dynamics simulations and advanced visualization techniques and reveal that the hemibonded interaction plays key role in the behavior of OH*(aq).

Investigating Climate-Chemistry Interactions on Multiple Spatiotemporal Scales

Fine dust is a significant component of regional fine particulate matter (PM2.5) air pollution in the western U.S., especially during spring, and human-caused climate change could increase dust

Future changes in global warming potentials under representative concentration pathways

Global warming potentials (GWPs) are the metrics currently used to compare emissions of different greenhouse gases under the United Nations Framework Convention on Climate Change. Future changes in

Need to Estimate the Net Global Warming Potential of Nitrogenous Fertilizers

Besides N2O emission, other oxidized and reduced N compounds (NH3, NOx, NO3-) are also emitted from soils as result of use of N fertilizers which have shortand long-term, direct and indirect impacts

Mobility mechanism of hydroxyl radicals in aqueous solution via hydrogen transfer.

In insights into the local hydration and electronic structure of the OH* in aqueous solution from Car-Parrinello molecular dynamics and the mechanism of H-transfer between OH* and a water molecule are reported, revealing a novel H- transfer mechanism of hydrated OH*, resembling that ofhydrated OH(-) and presenting hybrid characteristics of hydrogen-atom and electron-proton transfer processes, where local structural fluctuations play a pivotal role.

Quantitative structure‐reactivity relationships of hydroxyl radical rate constants for linear and cyclic volatile methylsiloxanes

To measure •OH reaction rate constants for 4 cyclic and 4 linear VMS based on a relative rate method using a newly designed atmospheric chamber and to establish structure-reactivity relationships for the kinetics, better empirical models were developed by simple and multiple linear regressions of the measured values.

A Light Driven Burst of Hydroxyl Radicals in Newly Formed Cloud Droplets from Reaction Between Iron(II) and Organic Peroxides

  • J. Chen
  • Environmental Science, Physics
  • 2019
Author(s): Chen, Jie Rou | Advisor(s): Paulson, Suzanne E | Abstract: One of the most uncertain aspects of the climate system are aerosol particles and their interaction with clouds. Aerosol aging in

Laser-Induced Fluorescence of Hydroxyl (OH) Radical in Cold Atmospheric Discharges

The application of laser-induced fluorescence (LIF) to measurement of absolute concentra- tion of hydroxyl radicals in cold atmospheric discharges is described. Though only the case of OH is



Evidence for variability of atmospheric hydroxyl radicals over the past quarter century

The hydroxyl free radical (OH) is the major oxidizing chemical in the atmosphere, destroying about 3.7 petagrams (Pg) of trace gases each year, including many gases involved in ozone depletion, the

Small Interannual Variability of Global Atmospheric Hydroxyl

A small interannual OH variability is inferred, indicating that global OH is generally well buffered against perturbations and consistent with measurements of methane and other trace gases oxidized primarily by OH, as well as global photochemical model calculations.

Short-term variations in the oxidizing power of the atmosphere

Records of carbon monoxide containing radiocarbon (14CO), which is oxidized by hydroxyl radicals, from clean-air sites at Baring Head, New Zealand, and Scott Base, Antarctica, spanning 13 years are shown.

Two decades of OH variability as inferred by an inversion of atmospheric transport and chemistry of methyl chloroform

Abstract. We developed an iterative inverse method to infer inter-annual sources and sinks of methyl chloroform (MCF) from atmospheric measurements, on a monthly basis. The methodology is presented

CTM study of changes in tropospheric hydroxyl distribution 1990–2001 and its impact on methane

Impacts of emission changes on hydroxyl (OH) and methane lifetime in the troposphere are studied using an emission inventory for the period 1990–2001 as input to a global Chemical Transport Model

Renewed growth of atmospheric methane

Following almost a decade with little change in global atmospheric methane mole fraction, we present measurements from the Advanced Global Atmospheric Gases Experiment (AGAGE) and the Australian

Interannual variability and trend of CH4 lifetime as a measure for OH changes in the 1979–1993 time period

[1] The interannual variability and trend in the CH4 lifetime, as a measure for global mean OH concentration, have been analyzed systematically with three-dimensional (3-D) chemistry-transport model

Can the variability in tropospheric OH be deduced from measurements of 1,1,1‐trichloroethane (methyl chloroform)?

[1] Global three-dimensional (3-D) model calculations have been used to inversely determine OH concentrations from 1,1,1-trichloroethane (methyl chloroform or CH3CCl3) measurements at the Atmospheric

What can 14 CO measurements tell us about OH

The possible use of 14 CO measurements to con- strain hydroxyl radical (OH) concentrations in the atmo- sphere is investigated. 14 CO is mainly produced in the upper atmosphere from cosmic radiation.