Processing and deliveries of the MOPITT Version 6 products will cease on August 31, 2017. Users of V5 and V6 products are encouraged to instead use the V7 products. Please see the V7 User's Guide and errata page for issues in the V6 product that are resolved in V7. In particular, we note that V6N and V6J are not suitable for long term trend analysis. V6 product users who have special needs for V6 products generated for dates after March 31, 2017 should contact the MOPITT/NCAR team and inquire about the availability of such products.
V7 validation results are available in: Deeter, M. N., Edwards, D. P., Francis, G. L., Gille, J. C., Martinez-Alonso, S., Worden, H. M., and Sweeney, C.: A Climate-scale Satellite Record for Carbon Monoxide: The MOPITT Version 7 Product, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2017-71, in review, 2017.
Update: The effected files were reprocessed and redelivered as of April 10, 2017.
Due to an error in the reported PMC (pressure modulated cell) pressure following the February 2016 calibration activity, it was necessary to reprocess and redeliver MOPITT V6 and V7 data. Since V7 data are processed with interpolated calibration for the archival product, this required reprocessing for 2015 as well. We are still evaluating the resulting errors in total column and vertical profile CO values, but so far these appear to be relatively small (< 0.5%) and should not affect most users who have already downloaded data from 2015 or 2016.
Please check the MOPITT website for updates: https://www2.acom.ucar.edu/mopitt/news.
Processing and deliveries of the MOPITT Version 5 products concluded at the end of 2016. Users of V5 products are encouraged to instead begin using the V7 product. Improvements in V7 products are described here (https://www2.acom.ucar.edu/mopitt/news) and in the User's Guide also available on the MOPITT website (https://www2.acom.ucar.edu/mopitt/publications). V5 product users who have special needs for V5 products generated for dates after December 31, 2016 should contact the MOPITT/NCAR team and inquire about the availability of such products.
The Atmospheric Science Data Center (ASDC) at NASA Langley Research Center in collaboration with the Measurements Of Pollution In The Troposphere (MOPITT) Science Team is pleased to announce the release of Version 7 (V7) of the following MOPITT products:
• MOP02J - MOPITT Derived CO (Near and Thermal Infrared Radiances)
• MOP02N - MOPITT Derived CO (Near Infrared Radiances)
• MOP02T - MOPITT Derived CO (Thermal Infrared Radiances)
• MOP01 - MOPITT Level 1 Radiances
Several significant retrieval algorithm and product format changes are introduced in the V7 product. Details can be found in the V7 User's Guide available on the MOPITT Data and Information landing pages. Featured improvements in the V7 retrieval products include (1) the representation of changing atmospheric concentrations of N2O, (2) improved meteorological fields used in Level 2 processing, (3) improved cloud detection and (4) globally minimized retrieval biases.
Similar to the releases of the V5 and V6 products, three different types of V7 Level 2 products are available based on different subsets of the MOPITT calibrated thermal- and near-infrared (TIR and NIR) radiances. The format and content of these three types of files are identical. The choice of which type of product to use for a particular application depends on the relative importance of sensitivity to CO in the boundary layer, long-term stability, required geographical coverage, and other factors. Users of MOPITT products are encouraged to contact members of the MOPITT Science Team for advice on the appropriate product for particular applications.
A new and improved version of the ASDC MOPITT Search and Subset Web Application has been released. New features include:
- Versions 5 and 6 are now available for search and subsetting
- Subset output files for Version 6 data is now available in both HDF5 and netCDF4 formats
- Login is no longer required to search and subset, only when placing an order for data
- Previous subset and selections made on all pages are now saved for your convenience
Access at MOPITT Search and Subset Tool
New Subsetter for Level 2 Version 5 data
The Atmospheric Science Data Center (ASDC) at NASA Langley Research Center in collaboration with the MOPITT Science Team is pleased to announce the release of the MOPITT Search and Subset Web Application. Features of the Search and Subset Web Application enable a more efficient approach to selecting and ordering data subsets by supporting spatial, temporal and parameter subsetting for the following select MOPITT Level 2 Version 5 products:
MOP02J MOPITT V5 Derived CO (Near and Thermal Infrared Radiances)
MOP02N MOPITT V5 Derived CO (Near Infrared Radiances)
MOP02T MOPITT V5 Derived CO (Thermal Infrared Radiances)
Users can also select data to be downloaded in HDF and NetCDF formats.
The MOPITT Search and Subset Web Application URL: https://subset.larc.nasa.gov/mopitt/login.php
V6 Levels 1, 2 and 3
MOPITT Version 6 (V6) Level 1, 2, and 3 products are now available for the entire MOPITT mission. Major enhancements offered in the V6 product include (1) corrected geolocation (latitude and longitude) data, (2) use of the NASA MERRA ('Modern-Era Retrospective Analysis For Research And Applications') reanalysis product for meteorological fields and a priori surface skin temperatures, (3) updated CO a priori and (4) distribution of Level 2 and Level 3 products in HDF5 format.
More information on the content and format of the new products can be found in the V6 User's Guide available at the MOPITT/NCAR website (http://www2.acd.ucar.edu/mopitt). Generally, V6 Level 2 and Level 3 products should become available between three weeks and two months after the actual observations; this data latency is the result of the dependency on the MERRA reanalysis.
Versions 4, 5, and 6
MOPITT V4 processing officially ended on December 31, 2012. Processing and deliveries of the V5-TIR, V5-NIR, and V5 TIR/NIR products will continue for the foreseeable future. A manuscript presenting validation results for the V5 products was submitted to JGR. The V6 product, now in development, will feature: (1) correction of the geolocation bias in V4 and V5 products, (2) updated a priori based on the CAM-Chem model for 2000-2009, and (3) MERRA reanalysis for temperature and water vapor profiles, and a priori surface temperature. Users interested in evaluating the new V6 product prior to the official release should contact Merritt Deeter at firstname.lastname@example.org.
Version 4, 5 & 6
As previously announced, MOPITT V4 processing officially ended on December 31, 2012. Processing and deliveries of the V5-TIR, V5-NIR, and V5 TIR/NIR products will continue for the foreseeable future. A manuscript presenting validation results for the V5 products was submitted to JGR. The V6 product, now in development, will feature: (1) correction of the geolocation bias in V4 and V5 products, (2) updated a priori based on the CAM-Chem model for 2000-2009, and (3) MERRA reanalysis for temperature and water vapor profiles, and a priori surface temperature. Users interested in evaluating the new V6 product prior to the official release should contact Merritt Deeter at email@example.com.
Versions 3, 4, and 5; Levels 1 and 2
A small systematic error in the MOPITT geolocation values (latitude and longitude) has been identified. This issue affects both current (V4 and V5) and previous (V3) MOPITT operational products. In MOPITT daytime (descending) overpasses, reported longitudes (contained in the Level 1 and Level 2 data files) appear to be systematically biased by approximately 0.35 degrees to the west of MOPITT's actual field of view. Reported latitudes in daytime overpasses do not appear to be biased. The longitudinal error is similar to the size of a single MOPITT field of view (~22 km). Longitudinal errors increase at high latitudes where lines of longitude converge. Geolocation errors for nighttime (ascending) overpasses are different than errors for daytime overpasses and are not as well quantified.
For more details about notices, see News and Status on the MOPITT team web site.