isopleths of sea surface temperature (isotherms) across the Pacific Oc

isopleths of sea surface temperature (isotherms) across the Pacific Oc

isopleths of sea surface temperature (isotherms) across the Pacific Ocean for November 1982 and November 1988. Given that an El Nio was in progress during one of these years, which one was it? Explain your answer based on the sea surface temperature isotherm patterns and general El Nio characteristics.