Differential-absorption-lidar measurement of tropospheric ozone with excimer–Raman hybrid laser

1983 ◽  
Vol 8 (7) ◽  
pp. 347 ◽  
Author(s):  
O. Uchino ◽  
M. Tokunaga ◽  
M. Maeda ◽  
Y. Miyazoe
Keyword(s):  
Tropospheric Ozone ◽  
Lidar Measurement ◽  
Differential Absorption ◽  
Differential Absorption Lidar

scholarly journals Ground-based integrated path coherent differential absorption lidar measurement of CO<sub>2</sub>: hard target return

2012 ◽  
Vol 5 (6) ◽  
pp. 8579-8607
Author(s):  
S. Ishii ◽  
M. Koyama ◽  
P. Baron ◽  
H. Iwai ◽  
K. Mizutani ◽  
...  
Keyword(s):  
Pulse Repetition Frequency ◽  
Target Surface ◽  
Co2 Concentration ◽  
Information And Communications Technology ◽  
Detection Sensitivity ◽  
Lidar Measurement ◽  
Differential Absorption ◽  
Differential Absorption Lidar ◽  
In Situ Data

Abstract. The National Institute of Information and Communications Technology (NICT) have made a great deal of effort to develop a coherent 2-μm differential absorption and wind lidar (Co2DiaWiL) for measuring CO2 and wind speed. First, coherent Integrated Path Differential Absorption (IPDA) lidar experiments were conducted using the Co2DiaWiL and a hard target (surface return) located about 7.12 km south of NICT on 11, 27, and 28 December 2010. The detection sensitivity of a 2-μm IPDA lidar was examined in detail using the CO2 concentration measured by the hard target. The precisions of CO2 measurement for the hard target and 900, 4500 and 27 000 shot pairs were 6.5, 2.8, and 1.2%, respectively. The results indicated that a coherent IPDA lidar with a laser operating at a high pulse repetition frequency of a few tens of KHz is necessary for measuring the CO2 concentration of the hard target with a precision of 1–2 ppm. Statistical comparisons indicated that, although a small amount of in situ data and the fact that they were not co-located with the hard target made comparison difficult, the CO2 volume mixing ratio measured with the Co2DiaWiL was about 5 ppm lower than that measured with the in situ sensor. The statistical results indicated that there were no differences between the hard target and atmospheric return measurements. A precision of 1.5% was achieved from the atmospheric return, which is lower than that obtained from the hard-target returns. Although long-range DIfferential Absorption Lidar (DIAL) CO2 measurement with the atmospheric return can result in highly precise measurement, the precision of the atmospheric return measurement was widely distributed comparing to that of the hard target return. Our results indicated that it is important to use a Q-switched laser to measure the range-gated differential absorption optical depth with the atmospheric return and that it is better to simultaneously conduct both hard target and atmospheric return measurements to enable highly accurate CO2 measurement.

scholarly journals A mobile differential absorption lidar to measure sub-hourly fluctuation of tropospheric ozone profiles in the Baltimore–Washington, D.C. region

2014 ◽  
Vol 7 (10) ◽  
pp. 3529-3548 ◽  
Author(s):  
J. T. Sullivan ◽  
T. J. McGee ◽  
G. K. Sumnicht ◽  
L. W. Twigg ◽  
R. M. Hoff
Keyword(s):  
Tropospheric Ozone ◽  
Stratospheric Ozone ◽  
Surface Ozone ◽  
Buffer Gas ◽  
Differential Absorption ◽  
Differential Absorption Lidar ◽  
Nasa Goddard Space ◽  
Multiple Receivers ◽  
Ozone Profile ◽  
The Us

Abstract. Tropospheric ozone profiles have been retrieved from the new ground-based National Aeronautics and Space Administration (NASA) Goddard Space Flight Center TROPospheric OZone DIfferential Absorption Lidar (GSFC TROPOZ DIAL) in Greenbelt, MD (38.99° N, 76.84° W, 57 m a.s.l.), from 400 m to 12 km a.g.l. Current atmospheric satellite instruments cannot peer through the optically thick stratospheric ozone layer to remotely sense boundary layer tropospheric ozone. In order to monitor this lower ozone more effectively, the Tropospheric Ozone Lidar Network (TOLNet) has been developed, which currently consists of five stations across the US. The GSFC TROPOZ DIAL is based on the DIAL technique, which currently detects two wavelengths, 289 and 299 nm, with multiple receivers. The transmitted wavelengths are generated by focusing the output of a quadrupled Nd:YAG laser beam (266 nm) into a pair of Raman cells, filled with high-pressure hydrogen and deuterium, using helium as buffer gas. With the knowledge of the ozone absorption coefficient at these two wavelengths, the range-resolved number density can be derived. An interesting atmospheric case study involving the stratospheric–tropospheric exchange (STE) of ozone is shown, to emphasize the regional importance of this instrument as well as to assess the validation and calibration of data. There was a low amount of aerosol aloft, and an iterative aerosol correction has been performed on the retrieved data, which resulted in less than a 3 ppb correction to the final ozone concentration. The retrieval yields an uncertainty of 16–19% from 0 to 1.5 km, 10–18% from 1.5 to 3 km, and 11–25% from 3 to 12 km according to the relevant aerosol concentration aloft. There are currently surface ozone measurements hourly and ozonesonde launches occasionally, but this system will be the first to make routine tropospheric ozone profile measurements in the Baltimore–Washington, D.C. area.

scholarly journals A new differential absorption lidar to measure sub-hourly fluctuation of tropospheric ozone profiles in the Baltimore–Washington DC region

2014 ◽  
Vol 7 (4) ◽  
pp. 4321-4371 ◽  
Author(s):  
J. T. Sullivan ◽  
T. J. McGee ◽  
G. K. Sumnicht ◽  
L. W. Twigg ◽  
R. M. Hoff
Keyword(s):  
Tropospheric Ozone ◽  
Stimulated Raman Scattering ◽  
Stratospheric Ozone ◽  
Surface Ozone ◽  
Stokes Shift ◽  
Pump Energy ◽  
Washington Dc ◽  
Number Density ◽  
Differential Absorption ◽  
Differential Absorption Lidar

Abstract. Tropospheric ozone profiles have been retrieved from the new ground based National Aeronautics and Space Administration (NASA) Goddard Space Flight Center TROPospheric OZone DIfferential Absorption Lidar (GSFC TROPOZ DIAL) in Greenbelt, MD (38.99° N, 76.84° W, 57 m a.s.l.) from 400 m to 12 km a.g.l. Current atmospheric satellite instruments cannot peer through the optically thick stratospheric ozone layer to remotely sense boundary layer tropospheric ozone. In order to monitor this lower ozone more effectively, the Tropospheric Ozone Lidar Network (TOLNet) has been developed, which currently consists of five stations across the US. The GSFC TROPOZ DIAL is based on the Differential Absorption Lidar (DIAL) technique, which currently detects two wavelengths, 289 and 299 nm. Ozone is absorbed more strongly at 289 nm than at 299 nm. The DIAL technique exploits this difference between the returned backscatter signals to obtain the ozone number density as a function of altitude. The transmitted wavelengths are generated by focusing the output of a quadrupled Nd:YAG laser beam (266 nm) into a pair of Raman cells, filled with high pressure hydrogen and deuterium. Stimulated Raman Scattering (SRS) within the focus generates a significant fraction of the pump energy at the first Stokes shift. With the knowledge of the ozone absorption coefficient at these two wavelengths, the range resolved number density can be derived. An interesting atmospheric case study involving the Stratospheric–Tropospheric Exchange (STE) of ozone is shown to emphasize the regional importance of this instrument as well as assessing the validation and calibration of data. The retrieval yields an uncertainty of 16–19% from 0–1.5 km, 10–18% from 1.5–3 km, and 11–25% from 3 km to 12 km. There are currently surface ozone measurements hourly and ozonesonde launches occasionally, but this system will be the first to make routine tropospheric ozone profile measurements in the Baltimore–Washington DC area.

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