201305232320:
	/home/nersc/yanchun/tools/20thC/datm_diag_diff.sh	--->	air_2m_mean_YR_1948-2009-minus-air_2m_mean_YR_1948-2009.nc
	/home/nersc/yanchun/tools/20thC/datm_diag_diff.sh	--->	air_2m_mean_YR_1948-2009-minus-air_2m_mean_YR_1948-2009_PROJ_GL.*