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Stratospheric ozone is an important source of tropospheric ozone, particularly in the upper troposphere.Upper tropospheric (UT, 200 hpa) equatorial westerly ducts over the Pacific and Atlantic oceans are common locations for intrusions of extratropical air deep into the tropics.During boreal winter to spring, Rossby wave breaking occurs within these ducts and intrusions of dry and ozone rich stratospheric air can be seen on maps of potential vorticity (PV) of UT.These intrusions can affect UT ozone,especially in the northern tropical Pacific Ocean and its interannual variability is suggested to be linked to ENSO.