Validation of tropospheric emissions spectrometer (TES) nadir ozone profiles using ozonesonde measurements

• Main Authors: Ray Nassar, Jennifer A. Logan, Helen M. Worden, Inna A. Megretskaia, Kevin W. Bowman, B. Osterman, Anne M. Thompson, David W. Tarasick, Shermane Austin, Hans Claude
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2008
• Subjects: Antarctic; Arctic; Antarc*
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.117.2047; http://www.as.harvard.edu/chemistry/trop/publications/Nassar_2008.pdf

with ozonesonde profiles from the Intercontinental Chemical Transport Experiment Ozonesonde Network Study (IONS), the World Ozone and Ultraviolet Data Center (WOUDC), the Global Monitoring Division (GMD) of the Earth System Research Laboratory, and the Southern Hemisphere Additional Ozonesonde (SHADOZ) archives. Approximately 1600 coincidences spanning 72.5ºS-80.3ºN from October 2004 to October 2006 are found. The TES averaging kernel and constraint are applied to the ozonesonde data to account for the TES measurement sensitivity and vertical resolution. TES-sonde differences are examined in six latitude zones after excluding profiles with thick high clouds. Values for the bias and standard deviation are determined using correlations of mean values of TES ozone and sonde ozone in the upper troposphere (UT) and lower troposphere (LT). The UT biases range from 2.9-10.6 ppbv and the LT biases range from 3.7-9.2 ppbv, excluding the Arctic and Antarctic LT where TES sensitivity is low. A similar approach is used to assess seasonal differences in the northern midlatitudes where the density and frequency of sonde measurements are greatest. These results are briefly compared to TES V001 ozone validation work which also used ozonesondes but was carried out prior to improvements in the radiometric calibration and ozone retrieval in V002. Overall, the large number of TES and