Calculate mean spectra over the case for surface fields - #2358

Calculate mean spectra over the case for surface fields#2358

Carol Halliwell (cehalliwell) wants to merge 6 commits into

mainMetOffice/CSET:mainfrom

215_regional_power_spectra_new_operator_DCT_mean_of_caseMetOffice/CSET:215_regional_power_spectra_new_operator_DCT_mean_of_caseCopy head branch name to clipboard