Ice sheet modelling work suggests that the abrupt onset of the Bølling-Allerød (B-A) may have triggered the separation of the Cordilleran ice sheet and Laurentide Ice Sheet (and the opening of the ice-free corridor) producing a major contribution to meltwater pulse 1A from the North American ice sheet.
ˈaɪs ʃˈiːt mˈɑːdəlɪŋ wˈɜːk sədʒˈɛsts ðætðɪ ɐbɹˈʌpt ˈɑːnsɛt ʌvðə bˈɑːlɪŋˈælɚɹˌɑːd bˈiːɐ mˌeɪhɐv tɹˈɪɡɚd ðə sˌɛpɚɹˈeɪʃən ʌvðə kˈɔːɹdɪlɚɹən ˈaɪs ʃˈiːt ænd lˈɔːɹəntˌaɪd ˈaɪs ʃˈiːt ænd ðɪ ˈoʊpənɪŋ ʌvðɪ ˈaɪsfɹˈiː kˈɔɹɪdˌoːɹ pɹədˈuːsɪŋ ɐ mˈeɪdʒɚ kˌɑːntɹɪbjˈuːʃən tə mˈɛltwɔːɾɚ pˈʌls wˈʌn ˈeɪ fɹʌmðə nˈɔːɹθ ɐmˈɛɹɪkən ˈaɪs ʃˈiːt.