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Spatial and Temporal Variability of Ground and Satellite Column Measurements of NO2 and O3 over the Atlantic Ocean During the Deposition of Atmospheric Nitrogen to Coastal Ecosystems ExperimentIn situ measurements of O3 and nitrogen oxides (NO + NO2=NOx) and remote sensing measurements of total column NO2 and O3 were collected on a ship in the North Atlantic Ocean as part of the Deposition of Atmospheric Nitrogen to Coastal Ecosystems (DANCE) campaign in July August 2014,100 km east of the mid-Atlantic United States. Relatively clean conditions for both surface in situ mixing ratio and total column O3 and NO2 measurements were observed throughout the campaign. Increased surface and column NO2 and O3 amounts were observed when a terrestrial air mass was advected over the study region. Relative to ship-based total column measurements using a Pandora over the entire study, satellite measurements overestimated total column NO2 under these relatively clean atmospheric conditions over offshore waters by an average of 16. Differences are most likely due to proximity, or lack thereof, to surface emissions; spatial averaging due to the field of view of the satellite instrument; and the lack of sensitivity of satellite measurements to the surface concentrations of pollutants. Total column O3 measurements from the shipboard Pandora showed good correlation with the satellite measurements(r 0.96), but satellite measurements were 3 systematically higher than the ship measurements, in agreement with previous studies. Derived values of boundary layer height using the surface in situ and total column measurements of NO2 are much lower than modeled and satellite-retrieved boundary layer heights, which highlight the differences in the vertical distribution between terrestrial and marine environments.
Document ID
20170002030
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Martins, Douglas K. (Pennsylvania State Univ. University Park, PA, United States)
Najjar, Raymond G. (Pennsylvania State Univ. University Park, PA, United States)
Tzortziou, Maria (Maryland Univ. Baltimore County Baltimore, MD, United States)
Abuhassan, Nader (Maryland Univ. Baltimore County Baltimore, MD, United States)
Thompson, Anne M. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Kollonige, Debra E. (Maryland Univ. College Park, MD, United States)
Date Acquired
March 7, 2017
Publication Date
December 5, 2016
Publication Information
Publication: Journal of Geophysical Research:Atmospheres
Volume: 121
Issue: 23
ISSN: 2169-897X
Subject Category
Meteorology and Climatology
Report/Patent Number
GSFC-E-DAA-TN39635
Funding Number(s)
CONTRACT_GRANT: NNX12AD03A
CONTRACT_GRANT: NNX15AT34A
CONTRACT_GRANT: NNX17AE79A
Distribution Limits
Public
Copyright
Other