Aqua MODIS LUT version differences from OceanData ancillary versus MYD021KM

[ssecdc]

Hello,

Our team at the University of Wisconsin-Madison generates Aqua MODIS direct broadcast products for downstream users. The processing software depends on LUTs that are staged on the OceanData ancillary website (https://oceandata.sci.gsfc.nasa.gov/directdataaccess/Ancillary/LUTs/modisa/cal/OPER/). Our software routinely downloads the latest LUTs from this URL to use in near-real time processing of direct broadcast data. One of our downstream users noticed that the brightness temperatures, particularly for MODIS Band 27, were significantly different (a mean difference of ~6 K) between our DB L1B product and the global Aqua MYD021KM NRT L1B product of the same observation earlier this month. Upon further investigation, there were major differences in the LUT versions used. For example, as of July 20th, the direct broadcast product is using these LUTs:

:Reflective_LUT_Serial_Number_and_Date_of_Last_Change = "R698 2026:02:04:15:00";
:Emissive_LUT_Serial_Number_and_Date_of_Last_Change = "E697 2026:02:04:15:00";
:QA_LUT_Serial_Number_and_Date_of_Last_Change = "Q697 2026:02:04:15:00";

While the MYD021KM NRT (downloaded from https://nrt3.modaps.eosdis.nasa.gov/archive/allData/61/MYD021KM/) is using:
:Reflective_LUT_Serial_Number_and_Date_of_Last_Change = "R712 2026:07:02:15:00";
:Emissive_LUT_Serial_Number_and_Date_of_Last_Change = "E711 2026:07:02:15:00";
:QA_LUT_Serial_Number_and_Date_of_Last_Change = "Q711 2026:07:02:15:00";

Is there a reason why the OceanColor LUTs track significantly behind the LUT versions used for MYD021KM NRT? Is there a different source of Aqua MODIS LUTs that we should be using to more accurately track the global L1B product? Thank you.