only for TARGET_NEC_SX: initialise all of tmpFld in order to avoid surprises in diagstats_calc.F
only for TARGET_NEC_SX: initialise all of tmpFld in order to avoid
surprises in diagstats_calc.F

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h