mˈɛltwɔːɾɚ pˈʌls wˈʌn ˈeɪ ˌɛmdˌʌbəljˌuːpˈiː wˈʌn ˈeɪ ɪz ðə nˈeɪm jˈuːzd baɪ kwətˈɜːnɚɹi dʒɪˈɑːlədʒˌɪsts, pˌeɪliːoʊklˌaɪmɐtˈɑːlədʒˌɪsts, ænd ˌoʊʃənˈɑːɡɹəfɚz fɚɹə pˈiəɹɪəd ʌv ɹˈæpɪd pˈoʊstɡlˈeɪʃəl sˈiː lˈɛvəl ɹˈaɪz, bᵻtwˌiːn θˈɜːtiːn,fˈaɪvhˈʌndɹɪd ænd fˈoːɹtiːn,sˈɛvənhˈʌndɹɪd kˈæləndɚ jˈɪɹz ɐɡˈoʊ, dˈʊɹɹɪŋ wˌɪtʃ ðə ɡlˈoʊbəl sˈiː lˈɛvəl ɹˈoʊz bᵻtwˌiːn ænd ɪn ɐbˌaʊt fˈoːɹhˈʌndɹɪd fˈaɪvhˈʌndɹɪd jˈɪɹz, ɡˈɪvɪŋ mˈiːn ɹˈeɪts ʌv ɹˈʌfli slˈæʃ ɚ.
Meltwater pulse 1A (MWP1a) is the name used by Quaternary geologists, paleoclimatologists, and oceanographers for a period of rapid post-glacial sea level rise, between 13,500 and 14,700 calendar years ago, during which the global sea level rose between  and  in about 400–500 years, giving mean rates of roughly /yr.