Hi, MCIP V5.0 Release Notes indicate the layer collapsing has been removed with this version. Indeed you can no longer set CTMLAYS in the namelist. I’m curious to learn more about why the developers decided to remove this feature which I believe has been widely used. I find no explanation on this.…

@bkoo and @Kelvin – Thank you for your interest in the layer collapsing in MCIP. Layer collapsing was removed starting in MCIPv5.0 for several reasons. Layer collapsing can artificially distort the meteorological fields and introduce inconsistencies in the model simulations. The original CMAQ …

MCIP V5.0 removed layer collapsing

MCIP

Kelvin December 14, 2019, 8:39am 2

I am curious like you when I found that

CMAQ 5.4 layer extraction option

Cmaq emis question

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Vertical Layers - CMAQ/WRF/MCIP/EMIS CMAQ	1	944	February 12, 2019
Cannot collapse to thinner bottom or top layer than input MCIP	1	284	September 1, 2023
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MCIP V5.0 removed layer collapsing

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