<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">Hi
Martin</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">Many
thanks for such a clear explanation!</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">By
following your comments, I can further understand how the OBCS works in a simulation
with a curvilinear grid now. I have read a matlab file entitled ¡®rotate_uv2uvEN.m¡¯,
and I find the core code as follows:</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">uE(:,k)=AngleCS(:).*u(:,k)-AngleSN(:).*v(:,k);</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">vN(:,k)=AngleSN(:).*u(:,k)+AngleCS(:).*v(:,k);</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US"> </span><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">where
uE and vN, </span><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">I think </span><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">, are the velocity fields aligned with the geographical meridional
and zonal directions, and the inverse calculation should also rotate the velocity
field from the geographical direction to the corresponding curvilinear grid.</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">Am
I right?</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">Cheers</span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Times New Roman","serif"" lang="EN-US">Chengyan</span></p>
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