5:15 PM - 6:30 PM
[HTT18-P01] Feasibility of observations of middle and upper tropospheric and lower stratospheric ozone concentrations by GOSAT/TANSO-FTS
Keywords:GOSAT, TANSO-FTS, ozone, Arctic ozone depletion
Ozone vertical profiles are simultaneously retrieved from thermal infrared (TIR) spectra observed with Thermal and Near infrared Sensor for Carbon Observation (TANSO)- Fourier Transform Spectrometer (FTS) on board Greenhouse Gases Observing Satellite (GOSAT) in the data processing of the Version 1 CO2 product [Saitoh et al., 2016]. Focusing on polar regions where severe ozone depletions occur, we have analyzed characteristics of the TANSO-FTS ozone profiles and compared them with ozone data obtained with Atmospheric Chemistry Experiment (ACE)-FTS on board SciSat-1, which is a solar occultation sensor with higher vertical resolutions, for validating the TANSO-FTS ozone data.
First, we selected TANSO-FTS ozone data obtained in the latitude range of 70°N−80°N from 2009 to 2014 and calculated zonal means for each 10-day period for each month. We found that TANSO-FTS ozone concentrations in lower stratosphere (35−29 hPa) in February and March in 2011, when large-scale ozone destructions occurred, were significantly lower than ozone concentrations of a priori data used in the TANSO-FTS retrieval processing [McPeters et al., 2007] and lowest of the other years.
Next, we calculated averages of the TANSO-FTS ozone concentrations for each 15° longitude for shorter period in the northern high latitudes in 2011, and analyzed the ozone data by dividing them into the two regions: ozone-depleted region and no ozone-depleted region. The area of ozone depletion was determined from ozone column data of Ozone Monitoring Instrument (OMI) on board AURA; here, the region in the longitude of 0° to 30°E from March 26 to 31, 2011 was selected as the “ozone-depleted region” because severe ozone depletions were continuously observed there. TANSO-FTS ozone concentrations were much lower than the a priori concentrations in the ozone-depleted region, while TANSO-FTS ozone concentrations were in contrast closer to the a priori data in the no ozone-depleted region. We then compared TANSO-FTS ozone data with SciSat-1/ACE-FTS ozone data in northern high latitudes (60°N−70°N) in 2011. Comparison results showed that the TANSO-FTS ozone concentrations were closer to the SciSat-1/ACE-FTS ozone concentrations than the a priori concentrations in the lower stratosphere (around 60-20 hPa) in the ozone-depleted region, which could demonstrate the possibility of capturing a detailed structure of ozone depletion in the polar lower stratosphere by the TIR band of GOSAT/TANSO-FTS.
First, we selected TANSO-FTS ozone data obtained in the latitude range of 70°N−80°N from 2009 to 2014 and calculated zonal means for each 10-day period for each month. We found that TANSO-FTS ozone concentrations in lower stratosphere (35−29 hPa) in February and March in 2011, when large-scale ozone destructions occurred, were significantly lower than ozone concentrations of a priori data used in the TANSO-FTS retrieval processing [McPeters et al., 2007] and lowest of the other years.
Next, we calculated averages of the TANSO-FTS ozone concentrations for each 15° longitude for shorter period in the northern high latitudes in 2011, and analyzed the ozone data by dividing them into the two regions: ozone-depleted region and no ozone-depleted region. The area of ozone depletion was determined from ozone column data of Ozone Monitoring Instrument (OMI) on board AURA; here, the region in the longitude of 0° to 30°E from March 26 to 31, 2011 was selected as the “ozone-depleted region” because severe ozone depletions were continuously observed there. TANSO-FTS ozone concentrations were much lower than the a priori concentrations in the ozone-depleted region, while TANSO-FTS ozone concentrations were in contrast closer to the a priori data in the no ozone-depleted region. We then compared TANSO-FTS ozone data with SciSat-1/ACE-FTS ozone data in northern high latitudes (60°N−70°N) in 2011. Comparison results showed that the TANSO-FTS ozone concentrations were closer to the SciSat-1/ACE-FTS ozone concentrations than the a priori concentrations in the lower stratosphere (around 60-20 hPa) in the ozone-depleted region, which could demonstrate the possibility of capturing a detailed structure of ozone depletion in the polar lower stratosphere by the TIR band of GOSAT/TANSO-FTS.