<div dir="ltr"><div><div><div><div><div>Dear all,<br><br></div>There will be a nems trunk commit tomorrow. The nems ticket is #178: merge land surface upgrades to NEMS.<br><br>The changes are the upgrading of Noah LSM in the NEMS. The whole bundle includes:<br>
(1) Weizhong's modification to deal with rapid temperature drop during sunset (see ticket <a class="" href="https://svnemc.ncep.noaa.gov/trac/nems/ticket/163" title="enhancement: Modification of surface layer scheme (new)">#163</a>)<br>
(2) Replace the current global 1-deg 13-type SIB vegetation classification by MODIS global 1-km 20-type IGPB vegetation type<br>
(3) Replace the current global 1-deg 9-type Zolber soil type by 1-km 19-type STASGO dataset<br>
(4) Replace the current quarterly global 1-deg snowfree data by monthly global 5-km MODIS-based data<br>
(5) Replace the current global 1-deg maximum snow albedo by MODIS-based global 0.05-deg data<br>
(6) Unify the snow fraction and snow albedo in the land surface and surface radiation driver<br>
(7) Incorporate a simple urban model<br>
(8) Incorporate some physics improvements to deal with the surface cold/wet biases over snow.<br><br></div>GSM baseline is generated on both wcoss and theia. A new gsm regression test to use the updated soil type, vegetation type and snow alebedo data change is added.There is no impact on NMMB.<br><br></div>NEMS branch is:<br><br><a href="https://svnemc.ncep.noaa.gov/projects/nems/branches/Noah3.0">https://svnemc.ncep.noaa.gov/projects/nems/branches/Noah3.0</a><br><br></div>Cheers!<br><br><br><br></div>Jun<br></div>