Validation of Tropospheric Emission Spectrometer (TES) nadir stare ozone profiles using ozonesonde measurements during Arctic Research on the Composition.

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Presentation transcript:

Validation of Tropospheric Emission Spectrometer (TES) nadir stare ozone profiles using ozonesonde measurements during Arctic Research on the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) C. S. Boxe, G. Osterman, J. Worden, A. Eldering

NASA-JPL TES Team ARC-IONS Network Acknowledgements

Outline 1)Background and motivation for retrieving ozone (O 3 ) profiles via TES. 2)TES version 3 (V003) nadir stare ozone profiles comparison to ARC-IONS ozonesondes during ARCTAS – stare observation mode – TES (TES averaging kernal and a priori constraint) operator applied to TES-sonde measurment pairs – error analysis – Bratt’s Lake (April 18 th, 2008) and Egbert (July 5 th, 2008)

Outline 1)Background and motivation for retrieving ozone (O 3 ) profiles via TES. 2)TES version 3 (V003) nadir stare ozone profiles comparison to ARC-IONS ozonesondes during ARCTAS – stare observation mode – TES (TES averaging kernal and a priori constraint) operator applied to TES-sonde measurment pairs – error analysis – Bratt’s Lake (April 18 th, 2008) and Egbert (July 5 th, 2008)

Background and Motivation

Outline 1)Background and motivation for retrieving ozone (O 3 ) profiles via TES. 2)TES version 3 (V003) nadir stare ozone profiles comparison to ARC-IONS ozonesondes during ARCTAS – stare observation mode – TES (TES averaging kernal and a priori constraint) operator applied to TES-sonde measurment pairs – error analysis – Bratt’s Lake (April 18 th, 2008) and Egbert (July 5 th, 2008)

TES Stare Mode Stare: In nadir mode, point at specific locations over sites for validation and other scientific interest for up to about 4 minutes. Such observations are made for as long as the target is in within ±45° of the nadir direction (up to 210 seconds).

TES Stare Mode – Bratt’s Lake, April 18 th, 2008

Outline 1)Background and motivation for retrieving ozone (O 3 ) profiles via TES. 2)TES version 3 (V003) nadir stare ozone profiles comparison to ARC-IONS ozonesondes during ARCTAS – stare observation mode – TES (TES averaging kernal and a priori constraint) operator applied to TES- sonde measurment pairs – error analysis – Bratt’s Lake (April 18 th, 2008) and Egbert (July 5 th, 2008)

TES operator applied to sonde data a priori constraint vector TES averaging kernel Sonde Data accounts for TES sensitivity and vertical resolution

Outline 1)Background and motivation for retrieving ozone (O 3 ) profiles via TES. 2)TES version 3 (V003) nadir stare ozone profiles comparison to ARC-IONS ozonesondes during ARCTAS – stare observation mode – TES (TES averaging kernal and a priori constraint) operator applied to TES-sonde measurment pairs – error analysis – Bratt’s Lake (April 18 th, 2008) and Egbert (July 5 th, 2008)

Error Analysis random instrument spectral errors  f.s vector errors forward model errors  f.s vector errors uncertainty due to unresolved fine structure

Outline 1)Background and motivation for retrieving ozone (O 3 ) profiles via TES. 2)TES version 3 (V003) nadir stare ozone profiles comparison to ARC-IONS ozonesondes during ARCTAS – stare observation mode – TES (TES averaging kernal and a priori constraint) operator applied to TES-sonde measurment pairs – error analysis – Bratt’s Lake (April 18 th, 2008) and Egbert (July 5 th, 2008)

Spring and Summer TES ozone and ozonesonde comparisons Bratt’s Lake (April 2 nd, 2008), 50 o N, 105 o W Barrow (April 10 th, 2008), 71 o N, 157 o W Barrow (April 12th, 2008), 71 o N, 157 o W Barrow (April 14th, 2008), 71 o N, 157 o W Bratt’s Lake (April 18 th, 2008), 50 o N, 105 o W Egbert (July 5 th, 2008), 44 o N, 80 o W Yellowknife (July 5 th,2008), 62 o N, 114 o W Egbert (July 7 th, 2008), 44 o N, 80 o W Yellowknife (July 7 th,2008), 62 o N, 114 o W

Select Spring and Summer TES ozone and ozonesonde comparisons April 18 th, 2008, Bratt’s Lake

Select Spring and Summer TES ozone and ozonesonde comparisons July 5 th, 2008, Egbert

Conclusions 1.Actual random (noise + temperature and interfering species) error consistent with actual errors. 2.Bias is consistent with prior sonde comparisons (H. Worden et al. 2007, 2006, 2004, and Nassar et al. 2008). 3.At high latitudes TES data primarily sensitive to ozone in the middle and upper troposphere. Sensitivity to lower troposphere depends on thermal contrast.