MOPITT measurements provide vertical profiles and total column CO and are useful to analyze the distribution, transport, sources and sinks of CO on a global level.
MOPITT retrievals of CO are publicly available for the period starting March 3, 2000 and continuing to the present.
The current variants of MOPITT CO retrievals (Level 2 and Level 3 products) are:
- TIR: thermal infrared-only (TIR-only, band near 4.7 μm) product
- NIR: near infrared-only (NIR-only, band near 2.3 μm) product
- TIR+NIR: joint or multispectral TIR and NIR product
The MOPITT version V3 product (now outdated) was the first satellite data set for tropospheric CO observation and its characteristics is covered in a paper by Deeter et. al., 2003.
Mopitt V4 product uses variable a priori (Deeter et. al., 2010) and it was found that V4 data are in good agreement with aircraft measurements (Emmons et. al., 2009) and ground spectrometers(Yurganov et. al., 2010) with no instrumental drift after 2002.
Version 5, Level 2 and Level 3 products were discontinued at the end of 2016 and version 6 Level 2 and Level 3 products were discontinued on September 20, 2017.
The Version 7, Level 2 and Level 3 products are available for the entire MOPITT mission, and the newest MOPITT Version 8 product (released in January 2019) is also available for the entire mission.
|Version||Variants||Operational Period||CO A Priori||Meteorological model||User Guide|
|V5||TIR, NIR, TIR+NIR||2011-2016||MOZART||NCEP||https://www2.acom.ucar.edu/sites/default/files/mopitt/v5_users_guide_beta.pdf|
|V6||TIR, NIR, TIR+NIR||2013-present||CAM-chem||MERRA||https://www2.acom.ucar.edu/sites/default/files/mopitt/v6_users_guide_201309.pdf|
|V7||TIR, NIR, TIR+NIR||2016-present||CAM-chem||MERRA2||https://www2.acom.ucar.edu/sites/default/files/mopitt/v7_users_guide_201707.pdf|
|V8||TIR, NIR, TIR+NIR||2018-present||CAM-chem||MERRA2||https://www2.acom.ucar.edu/sites/default/files/mopitt/v8_users_guide_201812.pdf|
In May, 2001, one of MOPITT's two coolers failed, effectively disabling channels 1 - 4. After extensive diagnostics and some minor reconfiguration of the Channel 7 PMC , MOPITT resumed operations in August, 2001 with channels 5 - 8 fully functional (cooler in unbalanced mode) . No MOPITT products are available for the period between May 7 and August 24, 2001. Therefore, the retrivals are divided in :
"Phase-I" CO Retrievals (March, 2000 - May, 2001) and "Phase-II" CO Retrievals (August, 2001 - present)
Phase I and Phase II CO retrievals are similar in terms of vertical resolution and information content.
Where to find the data?
Daily and monthly CO plots can be observed on the NCAR website with about a 3 week lag: https://www2.acom.ucar.edu/mopitt
The NCAR interactive data viewer can be accessed at: https://www.acom.ucar.edu/mopitt/webview/plot-options.shtml
The data in .he5 format for download can be accessed on the NASA earth data website: https://asdc.larc.nasa.gov/project/MOPITT
The NRT data can be accessed at: https://earthdata.nasa.gov/earth-observation-data/near-real-time/download-nrt-data/mopitt-nrt
To view the .he5 data you can use the NASA tool, Panoply, which can be accessed for download at: https://www.giss.nasa.gov/tools/panoply/download/
A useful tool is GIOVANNI where you can access the data for several species as well as several instruments and plot the data. You can access MOPITT data by selecting CO and MOPITT from the drop down lists.
Another useful tool is the NASA WorldView tool where you can add layers of different data from different instruments and plot the data for different dates.