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Abnormal frozen in winter

Dear All, Now I am doing is a single point simulation, using CLM3.5 offline version. I am confused about the abnormal lower of soil temperature in winter.  The problem is, for summer, the result looks quite well. But for winter, the soil temperature goes sub-zero, which is opposite to the observated data.  Fig. attached.  I have tuned soil sand/clay, soil color, PCT_PFT, vegetation LAI/SAI/TOP/BOT, still can not fix it. Please give me some suggestion, I appreciated it a lot.  Thanks