Abstract
Abstract. The largest uncertainty in future projections of sea level change comes from
the uncertain response of the Antarctic Ice Sheet to the warming oceans and
atmosphere. The ice sheet gains roughly 2000 km3 of ice from
precipitation each year and loses a similar amount through solid ice
discharge into the surrounding oceans. Numerous studies have shown that the
ice sheet is currently out of long-term equilibrium, losing mass at an
accelerated rate and increasing sea level rise. Projections of sea level
change rely on accurate estimates of the contribution of land ice to the
contemporary sea level budget. The longest observational record available to
study the mass balance of the Earth's ice sheets comes from satellite
altimeters. This record, however, consists of multiple satellite missions
with different life spans and inconsistent measurement types (radar and laser) of varying quality. To fully utilize these data, measurements from
different missions must be cross-calibrated and integrated into a consistent
record of change. Here, we present a novel approach for generating such a
record that implies improved topography removal, cross-calibration, and
normalization of seasonal amplitudes from different mission. We describe in
detail the advanced geophysical corrections applied and the processes needed
to derive elevation change estimates. We processed the full archive record
of satellite altimetry data, providing a seamless record of elevation change
for the Antarctic Ice Sheet that spans the period 1985 to 2020. The data are
produced and distributed as part of the NASA MEaSUREs ITS_LIVE (Making Earth System Data Records for Use
in Research Environments Inter-mission Time Series of Land Ice Velocity and Elevation) project (Nilsson et al., 2021, DOI:
https://doi.org/10.5067/L3LSVDZS15ZV).
Funder
Jet Propulsion Laboratory
Subject
General Earth and Planetary Sciences
Cited by
11 articles.
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