|
Descripción
|
|
|---|---|
| We have processed, using feature tracking, 54 pairs of Sentinel-1 synthetic-aperture radar images of the Academy of Sciences Ice Cap, Severnaya Zemlya, Russian Arctic, acquired from November 2016 to November 2017. Seasonal velocity variations up to 10% (20% peak-to-peak) of the yearly-averaged velocity are observed. Shorter-term intra-annual velocity variations have average deviations up to 16% and maximum up to 32% (32% and 64% peak-to-peak). This gives an indication of the errors incurred when extrapolating to the whole year discharge values determined from a single pair of SAR images. Average ice discharge for 2016-2017 was 1.93 ± 0.12 Gt a ?1 . The difference from an estimate of ? 1.4 Gt a ?1 for 2003-2009 is attributed to the initiation of ice stream flow in a southern basin. The total geodetic mass balance for the ice cap over 2012-2016 is ?1.72 ± 0.67 Gt a ?1 (?0.31 ± 0.12 m w.e. a ?1 ). The climatic mass balance is not significantly different from zero, at 0.21 ± 0.68 Gt a ?1 (0.04 ± 0.12 m w.e. a ?1 ), and has remained at this level for the last four decades, so the total mass balance is governed by the variations in ice discharge, whose long-term changes do not appear to respond to environmental changes but to the intrinsic characteristics of the ice cap. | |
|
Internacional
|
Si |
|
JCR del ISI
|
Si |
|
Título de la revista
|
Journal of Glaciology |
|
ISSN
|
0022-1430 |
|
Factor de impacto JCR
|
3,643 |
|
Información de impacto
|
Datos JCR del año 2016 |
|
Volumen
|
|
|
DOI
|
|
|
Número de revista
|
|
|
Desde la página
|
- |
|
Hasta la página
|
- |
|
Mes
|
SIN MES |
|
Ranking
|
|