The Antarctic ozone hole was first reported from ground-based Dobson readings at Halley, not from satellite data

The Antarctic ozone hole entered the scientific record in May 1985, when British Antarctic Survey scientists Joe Farman, Brian Gardiner and Jonathan Shanklin published (in Nature, 16 May 1985) their finding that springtime ozone over Antarctica was collapsing. The measurements were ground-based: readings from a Dobson spectrophotometer operated at Halley Research Station, an instrument type BAS had run there since 1957. The British Antarctic Survey's own history states the trio "revealed that the protective ozone layer above Antarctica was disappearing each spring."

The load-bearing detail is where the discovery surfaced. NASA's satellite-borne Total Ozone Mapping Spectrometer (TOMS) had been recording the same anomalously low values from orbit for years, but the confirmed discovery came from a decades-old ground instrument, not from the satellite that had far more coverage. That inversion — the richer dataset did not yield the discovery first — is the setup for the more-repeated (and more oversimplified) story about NASA's software: see myth-nasa-software-discarded-the-ozone-hole.

The same "a real signal nearly lost at the instrument-noise boundary" shape recurs in radio astronomy eighteen years earlier: claim-bell-burnell-1967-pulsar-scruff-first-dismissed-as-interference.