Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Factors controlling the accelerated expansion of Imja Lake, Mount Everest region, Nepal |
| Abstract | This study explores the link between area increase of Imja Tsho (Lake) and changes of Imja Glacier (area ~25km2) under the influence of climate change using multitemporal satellite imagery and local climate data. Between 1962 and 2013, Imja Lake expanded from 0.03±0.01 to 1.35±0.05 km2 at a rate of 0.026±0.001 km2 a-1. The mean glacier-wide flow velocity was 37±30ma-1 during 1992-93 and 23±15ma-1 during 2013-14, indicating a decreasing velocity. A mean elevation change of -1.29±0.71ma-1 was observed over the lower part of the glacier in the period 2001-14, with a rate of -1.06±0.63ma-1 in 2001-08 and -1.56±0.80ma-1 in 2008-14. We conclude that the decrease in flow velocity is mainly associated with reduced accumulation due to a decrease in precipitation during the last few decades. Furthermore, glacier ablation has increased due to increasing maximum temperatures during the post-monsoon months. Decreased glacier flow velocities and increased mass losses induce the formation and subsequent expansion of glacial lakes under favourable topographic conditions. |
| Source | Annals of glaciology 57 (71), pp. 245–257 |
| Keywords | Climate changeGlacier flowGlacier hazardsMountain glaciersRemote sensing |
| Journal | Annals of glaciology |
| Editor | International Glaciological Society., [Cambridge], Regno Unito |
| Year | 2016 |
| Type | Articolo in rivista |
| DOI | 10.3189/2016AoG71A063 |
| Authors | Thakuri, Sudeep; Thakuri, Sudeep; Salerno, Franco; Salerno, Franco; Bolch, Tobias; Bolch, Tobias; Guyennon, Nicolas; Tartari, Gianni; Tartari, Gianni |
| Text | 356378 2016 10.3189/2016AoG71A063 Scopus 2 s2.0 84964374750 Climate change Glacier flow Glacier hazards Mountain glaciers Remote sensing Factors controlling the accelerated expansion of Imja Lake, Mount Everest region, Nepal Thakuri, Sudeep; Thakuri, Sudeep; Salerno, Franco; Salerno, Franco; Bolch, Tobias; Bolch, Tobias; Guyennon, Nicolas; Tartari, Gianni; Tartari, Gianni Consiglio Nazionale delle Ricerche; Universita degli Studi di Milano; Consiglio Nazionale delle Ricerche; Universitat Zurich; Technische Universitat Dresden This study explores the link between area increase of Imja Tsho Lake and changes of Imja Glacier area 25km2 under the influence of climate change using multitemporal satellite imagery and local climate data. Between 1962 and 2013, Imja Lake expanded from 0.03±0.01 to 1.35±0.05 km2 at a rate of 0.026±0.001 km2 a 1. The mean glacier wide flow velocity was 37±30ma 1 during 1992 93 and 23±15ma 1 during 2013 14, indicating a decreasing velocity. A mean elevation change of 1.29±0.71ma 1 was observed over the lower part of the glacier in the period 2001 14, with a rate of 1.06±0.63ma 1 in 2001 08 and 1.56±0.80ma 1 in 2008 14. We conclude that the decrease in flow velocity is mainly associated with reduced accumulation due to a decrease in precipitation during the last few decades. Furthermore, glacier ablation has increased due to increasing maximum temperatures during the post monsoon months. Decreased glacier flow velocities and increased mass losses induce the formation and subsequent expansion of glacial lakes under favourable topographic conditions. 57 Published version http //www.scopus.com/record/display.url eid=2 s2.0 84964374750 origin=inward Articolo in rivista International Glaciological Society. 0260 3055 Annals of glaciology Annals of glaciology Ann. glaciol. THAKURI SUDEEP franco.salerno SALERNO FRANCO nicolasdominique.guyennon GUYENNON NICOLAS DOMINIQUE gianni.tartari TARTARI GIANNI |