Fri Apr 10, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Ayabilah, John Bright, King, Matt, Udy, Danielle, and Vance, Tessa, 2026. The changing mass of the Antarctic Ice Sheet during ENSO–dominated periods in the GRACE era (2002─2022). The Cryosphere, 20(2):1237–1255, doi:10.5194/tc-20-1237-2026.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2026TCry...20.1237A,
author = {{Ayabilah}, John Bright and {King}, Matt and {Udy}, Danielle and {Vance}, Tessa},
title = "{The changing mass of the Antarctic Ice Sheet during ENSO-dominated periods in the GRACE era (2002─2022)}",
journal = {The Cryosphere},
year = 2026,
month = feb,
volume = {20},
number = {2},
pages = {1237-1255},
abstract = "{Large-scale modes of climate variability significantly influence
Antarctic Ice Sheet (AIS) mass change. Improved understanding of
the relationship between these climate modes and AIS mass change
can help reduce uncertainties in future ice mass estimates and
its contribution to sea level rise. However, the spatiotemporal
patterns of AIS mass variation driven by El Ni{\~n}o Southern
Oscillation (ENSO)-induced atmospheric circulation remain
unclear. We investigated AIS mass variability during different
ENSO periods using Gravity Recovery and Climate Experiment
(GRACE) observed mass changes and modelled surface mass balance
(using RACMO2.4p1) over the period 2002 to 2022. To allow
comparison with GRACE, we used a cumulative sum indexing method
to define different ENSO-dominated `periods' over 2002─2022.
This method results in time periods that are dominated by a
particular phase of ENSO, that is not necessarily equivalent to
specific events as derived from canonical indices. The results
show strong spatial variability in how the ENSO teleconnection
cumulatively manifests over the AIS. These differing spatial
patterns are primarily driven by changes in the Amundsen Sea Low
strength, location, and extent, which alter circulation patterns
and moisture flow in West Antarctica. In East Antarctica, ice
mass variability is largely influenced by the positioning of
cyclonic and anticyclonic circulation anomalies, primarily
driven by the Southern Annular Mode; however, ENSO signals are
also present. In both East and West Antarctica, this study shows
that the spatial impact of any given ENSO-dominant period can
trigger distinct circulation patterns which can variably
influence surface mass balance and ice mass change. However,
uncertainties remain, as the mass variability observed during
ENSO-dominant periods may not be solely attributed to ENSO, due
to teleconnections that may not have fully developed or may have
been masked by other processes.}",
doi = {10.5194/tc-20-1237-2026},
adsurl = {https://ui.adsabs.harvard.edu/abs/2026TCry...20.1237A},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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