<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Hi,<DIV><BR class="khtml-block-placeholder"></DIV><DIV>I am a graduate student and seeking some suggestion for my research. I am new to amospheric sci, so pardon me if my query is naive. </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I am trying to study the effect of vegetation controlled by topography on the regional climate. For the purpose, I am coupling a home-grown LSM model with WRF. I want to run long simulations (of the order of decades).</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><SPAN class="Apple-style-span">In order to isolate the effects of vegetation on the regional climate from other large scale atmospheric processes, I was planning to use cyclic boundary conditions. I have am doubts about this approach now that running the model that long with cyclic conditions would eventually result in loss of energy of the system. So here is my question: <B>Is there a way prescribe a synoptic forcing to WRF while using cyclic boundary conditions? </B></SPAN></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I also noticed that for "real" cases, 4D arrays of boundary values as well as their tendencies are used in lateral boundary condition files. Is what I am trying to achieve is basically forcing the model with "real tendencies" while having cyclic boundary conditions? </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Any suggestions/comments would be greatly appreciated.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>With regards,</DIV><DIV>-Gautam.</DIV><DIV><BR></DIV></BODY></HTML>