The isotopic exchange between liquid water and ice caused the snowmelt to have low d 18 O values early in the season and become heavier as melting progressed.
(the snowmelt; to become; heavier; T:as melting progressed) (melting; progressed; ) (The isotopic exchange between liquid water and ice; caused; the snowmelt to have low d 18 O values early in the season and become heavier) Context(The isotopic exchange between liquid water and ice caused,List([0, 57))):(the snowmelt; to have; low d 18 O values; T:early in the season)
The isotopic exchange between liquid water and ice caused,List([0, 57))
the snowmelt melting The isotopic exchange between liquid water and ice the snowmelt
to become progressed caused to have
heavier T:as melting progressed
the snowmelt to have low d 18 O values early in the season and become heavier
low d 18 O values T:early in the season