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Tree-ring δ18O from an Alpine catchment reveals changes in glacier stream water inputs between 1980 and 2010
Ist Teil von
Arctic, antarctic, and alpine research, 2019-01, Vol.51 (1), p.250-264
Ort / Verlag
Taylor & Francis
Erscheinungsjahr
2019
Link zum Volltext
Quelle
EZB Free E-Journals
Beschreibungen/Notizen
The tree-ring stable carbon and oxygen isotope chronologies from two forest sites located in the Forni Glacier forefield (Italy)-one along the glacier stream (GL) and the other toward the valley slope (SL)-were analyzed with the aim of disentangling the precipitation and glacier meltwater inputs in source water δ
18
O, as reflected by the tree-ring cellulose δ
18
O. The cellulose δ
18
O from the GL trees has a negative correlation with winter and summer temperatures, whereas the cellulose δ
18
O from the SL trees has a positive correlation with precipitation δ
18
O. The isotopic signature of the source water at the GL site is also influenced by waters of glacial origin, as confirmed by the
18
O-depleted glacier meltwater inputs (GMWI_δ
18
O) estimated by means of an isotope model. The GMWI_δ
18
O values are consistent with the mean difference measured between the δ
18
O in the glacier stream and in the precipitation and the winter and summer temperature explains up to 37 percent of the GMWI_δ
18
O variance. Our results show an increasing influence of glacier meltwater throughout the past decade for the GL site. Our analysis opens new opportunities to reconstruct changes in water regimes of the glacier streams by means of the tree-ring cellulose δ
18
O.