MOPITT V8 Release Announcement

Feb. 12, 2019, 7 a.m.

Project: MOPITT

The MOPITT team is releasing Version 8 (V8) Level 2 (L2) and Level 3 (L3) retrievals from the Thermal Infrared Radiance (TIR) MOPITT channels, with Near-Infrared (NIR) and Joint (TIR+NIR) Radiances. The primary innovation in V8 is a method to adjust MOPITT Level 1 radiances in order to correct retrieval biases that depend on time and atmospheric water vapor. A temporal bias drift, observed in different vertical layers of the retrieved MOPITT CO profiles when compared to NOAA in situ validation data (Deeter et al., 2017), is likely due to slowly changing parameters within the MOPITT instrument. This bias drift has been sharply reduced and is now within the errors of the validation comparison. The bias dependence on water vapor resulted in retrieval biases that were most pronounced in the tropics and are now are significantly reduced in V8. These improvements to the MOPITT bias drift and latitude-dependent biases should alleviate the need for applying post-retrieval bias corrections to MOPITT CO profiles before data assimilation, when using V8. In addition, MOPITT V8 uses a consistent MODIS Collection 6.1 cloud mask for the entire data record, includes updated spectroscopic data for water vapor and N2 continua and has improved the method for calculating total column averaging kernels.

Level 3 Poducts:

Level 2 Products:

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