From a90cfce495340816123ffc2be2fe17efd85862ba Mon Sep 17 00:00:00 2001
From: Jaydeep Singh <40514224+jaydeeptindori@users.noreply.github.com>
Date: Wed, 2 Sep 2026 12:24:23 +0200
Subject: [PATCH 1/2] Fix delta-T calculation in sfcphys.F fixing potential
 temperature

Correct delta-T calculation by dividing t1 by pisfc to convert it to surface temperature
---
 src/sfcphys.F | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sfcphys.F b/src/sfcphys.F
index fe67a9ad..3d671844 100644
--- a/src/sfcphys.F
+++ b/src/sfcphys.F
@@ -1100,7 +1100,7 @@ subroutine cm1most(u1,v1,s1,t1,tst,qst,thflux,qvflux,zol,mol,rmol,  &
       endif
 
       ! save delta-T and delta-q (used for use_avg_sfc only)
-      delt = t1(i,j)-tsk(i,j)
+      delt = t1(i,j)/pisfc-tsk(i,j)
       delq = q1(i,j)-qsfc(i,j)
 
     enddo

From 5a18dd692fb8a25ec50a5a5c0c9c30b6016afe1a Mon Sep 17 00:00:00 2001
From: Jaydeep Singh <40514224+jaydeeptindori@users.noreply.github.com>
Date: Wed, 2 Sep 2026 12:40:48 +0200
Subject: [PATCH 2/2] Correct delt calculation in sfcphys.F

Fix calculation of delt by adjusting the order of operations.
---
 src/sfcphys.F | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sfcphys.F b/src/sfcphys.F
index 3d671844..1dd09225 100644
--- a/src/sfcphys.F
+++ b/src/sfcphys.F
@@ -1100,7 +1100,7 @@ subroutine cm1most(u1,v1,s1,t1,tst,qst,thflux,qvflux,zol,mol,rmol,  &
       endif
 
       ! save delta-T and delta-q (used for use_avg_sfc only)
-      delt = t1(i,j)/pisfc-tsk(i,j)
+      delt = t1(i,j)-tsk(i,j)/pisfc
       delq = q1(i,j)-qsfc(i,j)
 
     enddo