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Improved ozone DIAL retrievals in the upper troposphere and lower stratosphere using an optimal estimation method
Applied Optics
|March 16, 2019
Summary
This study introduces an optimal estimation method for retrieving ozone density profiles using combined tropospheric and stratospheric differential absorption lidar (DIAL) measurements. The new method significantly improves ozone profile accuracy in the upper troposphere and lower stratosphere (UTLS).
Area of Science:
- Atmospheric Science
- Lidar Technology
- Ozone Layer Research
Background:
- Accurate ozone density profiles are crucial for understanding atmospheric chemistry and dynamics.
- Differential Absorption Lidar (DIAL) systems provide valuable data for ozone profiling.
- Integrating tropospheric and stratospheric DIAL measurements presents retrieval challenges, especially in overlapping regions.
Purpose of the Study:
- To develop and implement a first-principle optimal estimation method (OEM) for retrieving ozone density profiles.
- To enhance ozone profile accuracy in the upper troposphere and lower stratosphere (UTLS) by combining tropospheric and stratospheric DIAL data.
- To validate the retrieved ozone profiles against independent measurements.
Main Methods:
- Implementation of a first-principle optimal estimation method (OEM).
- Simultaneous utilization of tropospheric and stratospheric differential absorption lidar (DIAL) measurements.
- Validation of retrieved ozone profiles using coincident ozonesonde data from the Observatoire de Haute Provence.
Main Results:
- Successful retrieval of ozone density profiles from 2.5 km to 42 km altitude.
- Significant improvement in ozone profile retrieval within the UTLS overlapping region.
- Retrieved ozone profiles demonstrated consistency between the two DIAL systems and with ozonesonde data.
- Maximum statistical uncertainty in the UTLS region did not exceed 7%.
Conclusions:
- The optimal estimation method effectively integrates tropospheric and stratospheric DIAL measurements for improved ozone profiling.
- The combined DIAL approach enhances accuracy and reduces uncertainty in the UTLS region.
- This method offers a robust tool for monitoring stratospheric and tropospheric ozone.
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