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Poster Session 3
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Density and Temperature Profile in the Lower
Atmosphere at Kmitl, Thailand
Result
Figure 1 shows the relation between the backscattering cross section which obtain from data in log scale with altitude. After obtaining backscattering cross section, the density profile that convert from backscattering cross section profile. However, the error will be occur because the return signal that come from both mixture of various gases and the aerosol or any particle in the atmosphere so that the density profile is the average of the collection of return signal. Figure 2 illustrates the averages density with the line of standard deviation at any altitude.
Figure 1. Backscattering cross section
Figure 2. Average density
Figure 3. show the comparison between the density profiles which obtains from the observation and a direct line by simulating from U. S. model. Figure 4 is the temperature that come from integrated hydrostatic equation. Moreover, in the figure 4 also compares the temperature from the observation with a direct line that come from with model. Finally, the three-difference of temperature value come from observation, model and radiosonde, respectively, as show in the Table 2.
Figure 3. Density which obtain from observation and simulation.
Figure 4. Temperature profile
Table 2. Three-difference temperature value
| Altitude (m) |
U. S. standard (K) |
Observation (K) |
Radiosonde (+ m) |
| 900 |
282.30 |
- |
295.35 (+9) |
| 1800 |
276.45 |
- |
290.15 (+75) |
| 2700 |
270.60 |
- |
285.55 (-65) |
| 3600 |
264.76 |
- |
280.65 (-75) |
| 4500 |
258.93 |
287.89 |
275.25 (+108) |
| 5400 |
253.08 |
284.58 |
271.85 (+38) |
| 6300 |
247.24 |
278.04 |
276.85 (+38) |
| 7200 |
241.40 |
265.62 |
260.95 (-33) |
| 8100 |
235.56 |
258.69 |
254.05 (+120) |
| 9000 |
229.73 |
267.66 |
248.45 (+84) |
| 10800 |
218.06 |
257.23 |
234.15 (+93) |
| 11700 |
216.65 |
232.19 |
228.55 (-154) |
| 12600 |
216.65 |
238.72 |
219.05 (+48) |
| 13500 |
216.64 |
219.30 |
211.75 (+25) |
| 14400 |
216.65 |
221.29 |
205.95 (-131) |
Summary
The lidar system at KMITL has been developed continuously. In this paper, the number density profile and temperature profile are determined. For troposphere or boundary layer, it is difficult to obtain the number density and temperature profile correctly because the Rayleigh lidar method uses for the backscattering, but the boundary layer has many various particle, especially the aerosol and cloud that will cause the error. However, this method is useful for the stratosphere or higher altitude.
References
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NY: Wiley, 1984.
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- F. G. Fernald, J. Appl. Opt., vol. 23, no5, pp. 652-653, 1984.
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- K. Parameswaran, K. O. Rose, and B. V. Krishna Murthy, J. Appl. Opt., vol. 30, pp. 3059-3071, 1991.
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