Surface sites, nitrogen species measurement

Completion of Field Studies in the Troposphere with Better Spatial Coverage. All of the examples of tropospheric measurements in this chapter were made at surface sites with the instrument inlets within 4 to 10 m of the ground. With the important influences of the surface on the near-surface concentrations of some atmospheric species and the lack of spatial information from surface studies, it is important to coordinate the surface measurements with aircraft (or balloon) measurements. Some aircraft measurements of nitrogen species in the troposphere have been made, but it is important to ensure that the measurement techniques on the surface and in the air give equivalent results. This assurance can only be accomplished through careful intercomparison of instruments utilized in each platform. 

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