Abstract

At daytime, metal resonance lidars need narrowband spectral filtering in the receiver to measure Doppler temperatures in the mesopause region. For our K lidar equipped with a Faraday anomalous dispersion optical filter we demonstrate that the derived resonance temperatures can be shifted by 10K because of the wavelength dependence of the filter transmission for the Rayleigh scattered light when this filter transmission is used for normalization. We show that, if all filter effects are considered correctly, temperature measurements at daytime can be as accurate as at nighttime without such filters.

© 2005 Optical Society of America

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References

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Figures (6)

Fig. 1
Fig. 1

Theoretical and measured spectral transmission curves of the K FADOF at the K D 1 line ( 770 nm ) for θ F = 125 ° C . The shaded area indicates the scan range of the K lidar, and the K D 1 line for two atmospheric temperatures T K is shown in arbitrary units (from Ref. [2]).

Fig. 2
Fig. 2

Spectral transmission of the K FADOF (dashed curve) and the calculated effective transmission for the obtained K resonance signal (gray curve) and the stratospheric Rayleigh signal (solid curve) as a function of laser wavelength for atmospheric temperatures ( T K and T Ray ) of 200 K .

Fig. 3
Fig. 3

(a) Influence on T M of the effective transmission for the resonance signal for two values of T K . The drift of θ F observed over several days is indicated (shaded area). (b) Influence on T M of the effective transmission for the Rayleigh signal.

Fig. 4
Fig. 4

Wavelength dependence of the Rayleigh signal from 35 to 40 km observed by the K lidar on February 20, 2004 (20:31–21:31 UT, shaded areas, error bars from photon count statistics). For comparison, the solid curve shows the theoretical transmission of the FADOF. The two curves are normalized.

Fig. 5
Fig. 5

Top, comparison of the obtained resonance spectrum with a model of the K D 1 line. Bottom, relative deviation of the model. Same measurement as in Fig. 4.

Fig. 6
Fig. 6

Simultaneous and collocated temperature observations by Fe and K lidar at the IAP, Kühlungsborn ( 54 ° N ) .

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