Validation of TES ammonia observations at the single pixel scale in the San Joaquin Valley during DISCOVER-AQ

Ammonia measurements from a vehicle‐based, mobile open‐path sensor and those from aircraft were compared with Tropospheric Emission Spectrometer (TES) NH3 columns at the pixel scale during the NASA Deriving Information on Surface conditions from Column and Vertically Resolved Observations Relevant t...

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Bibliographic Details
Published in:Journal of geophysical research. Atmospheres 2015-05, Vol.120 (10), p.5140-5154
Main Authors: Sun, Kang, Cady-Pereira, Karen, Miller, David J., Tao, Lei, Zondlo, Mark A., Nowak, John B., Neuman, J. A., Mikoviny, Tomas, Müller, Markus, Wisthaler, Armin, Scarino, Amy J., Hostetler, Chris A.
Format: Article
Language:English
Subjects:
Aircraft
Ammonia
Atmospheric chemistry
Footprints
Geophysics
Heterogeneity
Mixing ratios
NH3
Pixels
Satellites
Spectrometers
TES
validation
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Summary:Ammonia measurements from a vehicle‐based, mobile open‐path sensor and those from aircraft were compared with Tropospheric Emission Spectrometer (TES) NH3 columns at the pixel scale during the NASA Deriving Information on Surface conditions from Column and Vertically Resolved Observations Relevant to Air Quality field experiment. Spatial and temporal mismatches were reduced by having the mobile laboratory sample in the same areas as the TES footprints. To examine how large heterogeneities in the NH3 surface mixing ratios may affect validation, a detailed spatial survey was performed within a single TES footprint around the overpass time. The TES total NH3 column above a single footprint showed excellent agreement with the in situ total column constructed from surface measurements with a difference of 2% (within the combined measurement uncertainties). The comparison was then extended to a TES transect of nine footprints where aircraft data (5–80 ppbv) were available in a narrow spatiotemporal window (
ISSN:2169-897X
2169-8996
DOI:10.1002/2014JD022846