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Fig. 4.27
Nocturnal ozone mixing ratio profile over Philadelphia in the early hours of August 20,
1998, from Raman LIDAR measurements (
squares
with error bars) with LAPS (Lidar Atmospheric
Profile Sensor) compared to aircraft measurements (small symbols). From Philbrick and Mulik
(
2001
)
pattern is typical for a clear spring or early summer day with a radiation-dominated
diurnal variation of the boundary layer structure.
4.3.4.2 Horizontally Path-Averaging
Path-averaging measurements of trace gas and pollutant concentrations in the
infrared range can be made with FTIR and in the UV and visible range with
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