Merra2

[AnningCheng-NOAA]

1. MERRA2 ten year climatology data has been long flipped from -180 to 180 to 0 to 360 degree in order to decrease the computation cost.
2. MERRA2 interpolation code has been overhauled and the memory usage has been decreased 96 times (96 processors) for C768L127 with MERRA2 72 levels data.
3. The workflow for C768L127 with MERRA2 is tested in DELL, Hera, and Orion.

[dustinswales]

@AnningCheng-NOAA
If I understand correctly, no changes are needed to the G/GP radiation schemes to use the MERRA aerosols? (That would be fantastic!)

[AnningCheng-NOAA]

Dustin, The answer is yes or no. yes at this point. No in the future when radiation is upgraded.

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On Mon, Mar 29, 2021 at 4:34 PM dustinswales ***@***.***> wrote: @AnningCheng-NOAA <https://github.com/AnningCheng-NOAA> If I understand correctly, no changes are needed to the G/GP radiation schemes to use the MERRA aerosols? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALQPMIN5LEGIG47AJG74QBLTGDP55ANCNFSM4W7OT6OQ> .

[dustinswales]

Dustin, The answer is yes or no. yes at this point. No in the future when radiation is upgraded.
…
On Mon, Mar 29, 2021 at 4:34 PM dustinswales @.***> wrote: @AnningCheng-NOAA https://github.com/AnningCheng-NOAA If I understand correctly, no changes are needed to the G/GP radiation schemes to use the MERRA aerosols? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/ALQPMIN5LEGIG47AJG74QBLTGDP55ANCNFSM4W7OT6OQ .

@AnningCheng-NOAA
Great to hear.
This PR contains changes to the aerosol amount provided to the radiation schemes. Both RRTMG and RRTMGP use radiation_aerosols.f to compute the LW/SW aerosol optical properties (optical depth, single scattering albedo and asymmetry parameter) from this aerosol amount.
Can you speak to the future radiation upgrades? (I only ask because radiation_aerosols.f is a bit of a mess and doesn't fit perfectly with how we do things in RRTMGP. So if there are changes to this code, just keep me in the loop)

[AnningCheng-NOAA]

Dustin, I cannot tell how and what we should do on radiation_aerosols.f when MERRA2 is coupled with RRTMGP. We will be in close corporation with Robert and Qingfu, much of the work might be handled by them. On Tue, Mar 30, 2021 at 11:39 AM dustinswales ***@***.***> wrote:

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Dustin, The answer is yes or no. yes at this point. No in the future when radiation is upgraded. … <#m_3680028670688665814_> On Mon, Mar 29, 2021 at 4:34 PM dustinswales *@*.***> wrote: @AnningCheng-NOAA <https://github.com/AnningCheng-NOAA> https://github.com/AnningCheng-NOAA If I understand correctly, no changes are needed to the G/GP radiation schemes to use the MERRA aerosols? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2 (comment) <#2 (comment)>>, or unsubscribe https://github.com/notifications/unsubscribe-auth/ALQPMIN5LEGIG47AJG74QBLTGDP55ANCNFSM4W7OT6OQ . @AnningCheng-NOAA <https://github.com/AnningCheng-NOAA> Great to hear. This PR contains changes to the aerosol amount provided to the radiation schemes. Both RRTMG and RRTMGP use radiation_aerosols.f to compute the LW/SW aerosol optical properties (optical depth, single scattering albedo and asymmetry parameter) from this aerosol amount. Can you speak to the future radiation upgrades? (I only ask because radiation_aerosols.f is a bit of a mess and doesn't fit perfectly with how we do things in RRTMGP. So if there are changes to this code, just keep me in the loop) — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALQPMIKMN6Z7NAENNMOZJNLTGHWCJANCNFSM4W7OT6OQ> .

[RobertPincus]

@AnningCheng-NOAA, @dustinswales works closely with me. He understands that accessing aerosol optical properties through radiation_aerosols.fworks regardless of the underlying aerosol representation (i.e. it also works with MERRA aerosols). If he's mistaken please let us know.