Methyl, Ethyl, and Propyl Nitrates

Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments

Jenny A. Fisher, Elliot L Atlas, Barbara Barletta, Simone Meinardi, Donald R. Blake, Chelsea R. Thompson, Thomas B. Ryerson, Jeff Peischl, Zitely A. Tzompa-Sosa, Lee T. Murray

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Alkyl nitrates (RONO2) are important components of tropospheric reactive nitrogen that serve as reservoirs for nitrogen oxides (NOx≡ NO + NO2). Here we implement a new simulation of atmospheric methyl, ethyl, and propyl nitrate chemistry in a global chemical transport model (GEOS-Chem). We show that the model can reproduce the spatial and seasonal variability seen in a 20-year ensemble of airborne observations. Methyl nitrate accounts for 17 Gg N globally, with maxima over the tropical Pacific and Southern Ocean. Propyl nitrate is enhanced in continental boundary layers, but its global impact (6 Gg N) is limited by a short lifetime (8 days vs. 26 days for methyl nitrate and 14 days for ethyl nitrate) that inhibits long-range transport. Ethyl nitrate has the smallest impact of the three species (4 Gg N). We find that methyl nitrate is the dominant form of reactive nitrogen (NOy) in the Southern Ocean marine boundary layer, where its addition to the model corrects a large NOy underestimate in austral winter relative to recent aircraft data. RONO2 serve as a small net NOx source to the marine troposphere, except in the northern midlatitudes where the continental outflow is enriched in precursors that promote NOx loss via RONO2 formation. Recent growth in NOx emissions from East Asia has enhanced the role of RONO2 as a source of NOx to the remote free troposphere. This relationship implies projected future NOx emissions growth across the southern hemisphere may further enhance the importance of RONO2 as a NOx reservoir.

Original languageEnglish (US)
JournalJournal of Geophysical Research: Atmospheres
DOIs
StateAccepted/In press - Jan 1 2018

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propyl nitrate
methyl nitrate
marine environments
marine environment
nitrates
Nitrogen
nitrate
nitrogen
Troposphere
troposphere
boundary layers
oceans
Boundary layers
Nitrogen Oxides
nitrogen oxides
Pacific Ocean
temperate regions
Southern Hemisphere
Nitrates
winter

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

Methyl, Ethyl, and Propyl Nitrates : Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments. / Fisher, Jenny A.; Atlas, Elliot L; Barletta, Barbara; Meinardi, Simone; Blake, Donald R.; Thompson, Chelsea R.; Ryerson, Thomas B.; Peischl, Jeff; Tzompa-Sosa, Zitely A.; Murray, Lee T.

In: Journal of Geophysical Research: Atmospheres, 01.01.2018.

Research output: Contribution to journalArticle

Fisher, Jenny A. ; Atlas, Elliot L ; Barletta, Barbara ; Meinardi, Simone ; Blake, Donald R. ; Thompson, Chelsea R. ; Ryerson, Thomas B. ; Peischl, Jeff ; Tzompa-Sosa, Zitely A. ; Murray, Lee T. / Methyl, Ethyl, and Propyl Nitrates : Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments. In: Journal of Geophysical Research: Atmospheres. 2018.
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AU - Meinardi, Simone

AU - Blake, Donald R.

AU - Thompson, Chelsea R.

AU - Ryerson, Thomas B.

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