This connection is important because a significant variability in the yearly number of noctilucent ("glow in the dark") clouds (NLCs), one manifestation of PMCs, has been suggested as an indicator of global change.
ðɪs kənˈɛkʃən ɪz ɪmpˈoːɹtənt bɪkˈʌz ɐ sɪɡnˈɪfɪkənt vˌɛɹɪəbˈɪlᵻɾi ɪnðə jˈɪɹli nˈʌmbɚɹ ʌv nˈɑːktɪlˌuːsənt"ɡlˈoʊ ɪnðə dˈɑːɹk"klˈaʊdz ˌɛnˌɛlsˌiːˈɛs, wˈʌn mˌænɪfɪstˈeɪʃən ʌv pˌiːˌɛmsˈiːz, hˈæzbiːn sədʒˈɛstᵻd æz ɐn ˈɪndᵻkˌeɪɾɚɹ ʌv ɡlˈoʊbəl tʃˈeɪndʒ.