kˈɑːnsɪkwəntli, ðə sˈɜːfɪs ˈoʊʃən kəntˈeɪnz ɡɹˈeɪɾɚ pɹəpˈoːɹʃənz ʌv ˈeɪtiːn ˈoʊ ɚɹˈaʊnd ðə sʌbtɹˈɑːpɪks ænd tɹˈɑːpɪks wˌɛɹ ðɛɹ ɪz mˈoːɹ ɪvˌæpɚɹˈeɪʃən, ænd lˈɛsɚ pɹəpˈoːɹʃənz ʌv ˈeɪtiːn ˈoʊ ɪnðə mˈɪdlˈæɾɪtˌuːdz wˌɛɹ ɪt ɹˈeɪnz mˈoːɹ.
Consequently, the surface ocean contains greater proportions of 18O around the subtropics and tropics where there is more evaporation, and lesser proportions of 18O in the mid-latitudes where it rains more.