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[science-iwg] Release of MODIS Collection 6.1 Atmosphere Products

                            Release of MODIS Collection 6.1 for Atmosphere 
(Aerosol, Cloud, Cloud Mask and all Atmosphere Level-2 and Level-3 Products)

                                                         Introduction 
The MODIS Atmosphere Team has publicly released Collection 6.1 (C6.1) products for Terra for the entire 17 year data record from 2000 through present. 
Also publically released is the Aqua C6.1 forward processing with data dates beginning 1 Sep 2017 through present.  Aqua C6.1 reprocessing of historical data (from data dates of 2002 through 2017) began on 28 December 2017 and is continuing.  A complete reprocessing of the entire 15 year Aqua C6.1 data record expected by the end of March 2018.  Updated C6.1 Level-2 products include Cloud Mask (MOD35_L2), Aerosol (MOD04_L2, MOD04_3K), Cloud (MOD06_L2), Water Vapor (MOD05_L2), Profiles (MOD07_L2), and Joint (MODATML2) sub-sampled products. Level-3 C6.1 products (MOD08_D3, MOD08_E3, and MOD08_M3) have also been released. 

Algorithm documentation and the processing calendar for C6.1 can be found at: 
https://modis-atmosphere.gsfc.nasa.gov/documentation/collection-61 

Global browse imagery for many C6.1 Atmosphere products are available through links along the left-hand side of all browse pages (e.g., for L3 Daily):  
https://modis-atmosphere.gsfc.nasa.gov/images/l3-daily-browse   

                        Ordering and downloading C6.1 Atmosphere Products
C6.1 MODIS Atmosphere products can be ordered from the LAADS DAAC at: https://ladsweb.modaps.eosdis.nasa.gov/search/order/1 
or directly downloaded through the LAADS FTP site at:https://ladsweb.modaps.eosdis.nasa.gov/archive/allData/61/ 
 
           Background on the need for Collection 6.1 Atmosphere Products 
The MODIS Adaptive Processing System (MODAPS) is currently generating the C6.1 update for all MODIS Level-1 (L1) and Atmosphere Level-2 (L2) & Level-3 (L3) products. The need for C6.1 was driven by the desire to address a number of issues in the Collection 6.0 (C6.0) Level-1B (L1B) radiometric data (e.g., increasing electronic cross-talk in key infrared channels, solar channel response-versus-scan angle corrections, etc.), some of which were exacerbated following a Terra spacecraft safe hold event in February 2016. These L1B issues had a negative impact in varying degrees on downstream MODIS Atmosphere L2 and L3 products. Following the development of new radiometric corrections and the decision to reprocess the Terra MODIS L1B data record, the MODIS Atmosphere Team decided to use this reprocessing opportunity to implement some limited science improvements in their L2 and L3 products. 

                 Final note on continuing production of Collection 6.0 products 
To allow the MODIS Atmosphere community time to evaluate and transition to the C6.1 Atmosphere products, C6.0 forward processing of Atmosphere products will continue until 1 May 2018.  Finally, C6.0 products will remain available for download for 6 months after the forward processing of C6.0 ceases in 2018.

Edward Masuoka
Chief, Terrestrial Information Systems Laboratory Code 619 NASA's Goddard Space Flight Center Greenbelt, MD 20771

Edward.J.Masuoka@xxxxxxxx
Phone:  (301) 614-5515
Cell: (240) 716-2929




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