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A Differential Absorption Lidar (DIAL) for measurement of water vapour in the atmosphere of Mars  emits light pulses at the “on” and “off” wavelengths shown in Figure 1. The recorded backscatter signals are  shown in Figure 2. Use the signals to determine the average water vapour number density (molecules/m3 ) in the height range  between 2.0 km and 2.5 km.  The recorded signals at these heights are as follows:  Non(2.0km) = 0.6 kHz ; Noff(2.0km) = 1.5 kHz Non(2.5km) = 0.27 kHz ; Noff(2.5km) = 0.96 kHz

A Differential Absorption Lidar (DIAL) for measurement of water vapour in the atmosphere of Mars  emits light pulses at the “on” and “off” wavelengths shown in Figure 1. The recorded backscatter signals are  shown in Figure 2. Use the signals to determine the average water vapour number density (molecules/m3 ) in the height range  between 2.0 km and 2.5 km.  The recorded signals at these heights are as follows:  Non(2.0km) = 0.6 kHz ; Noff(2.0km) = 1.5 kHz Non(2.5km) = 0.27 kHz ; Noff(2.5km) = 0.96 kHz

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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A Differential Absorption Lidar (DIAL) for measurement of water vapour in the atmosphere of Mars 
emits light pulses at the “on” and “off” wavelengths shown in Figure 1. The recorded backscatter signals are 
shown in Figure 2.

Use the signals to determine the average water vapour number density (molecules/m3
) in the height range 
between 2.0 km and 2.5 km. 
The recorded signals at these heights are as follows: 
Non(2.0km) = 0.6 kHz ; Noff(2.0km) = 1.5 kHz
Non(2.5km) = 0.27 kHz ; Noff(2.5km) = 0.96 kHz

Height [km] 10 2 10° in 10° Aar 10* Ao 10³ Count Rate [MHz] 10² 10 10⁰
Transcribed Image Text:Height [km] 10 2 10° in 10° Aar 10* Ao 10³ Count Rate [MHz] 10² 10 10⁰
H₂O Cross Section [cm²/molecule] 943.299 10 10 10 10 A util 10° 943.219 10 10601.0931 10601.9901 Wavelength [nm] 943.139 A943.1296 10602.8870 943.060 10603.7840 Wavenumber [cm*] 942.980 94306197m 10604.6809 942.900 10605.5778
Transcribed Image Text:H₂O Cross Section [cm²/molecule] 943.299 10 10 10 10 A util 10° 943.219 10 10601.0931 10601.9901 Wavelength [nm] 943.139 A943.1296 10602.8870 943.060 10603.7840 Wavenumber [cm*] 942.980 94306197m 10604.6809 942.900 10605.5778
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