Simulated tracks and associated melting of 6912 small to giant Antarctic icebergs, September 1997 to December 2008

• Main Author: Rackow, Thomas
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: iceberg tracks; melt water; Southern Ocean; iceberg; giant iceberg; iceberg drift; Antarc*; Antarctic; Antarctica; Ice Sheet; Ice Shelf; Iceberg*
• Online Access: https://doi.org/10.5281/zenodo.8130749

We present a dataset of Antarctic iceberg drift tracks and melting that includes small, medium-sized, and giant tabular icebergs with a realistic size distribution. An iceberg model is initialized with 6912 observed iceberg positions and sizes around Antarctica. The dataset is the result of a 2017 study "A simulation of small to giant Antarctic iceberg evolution: Differential impact on climatology estimates" published in JGR:Oceans ( https://doi.org/10.1002/2016JC012513 ). We simulate drift and lateral melt using iceberg-draft averaged ocean currents, temperature, and salinity. A new basal melting scheme, originally applied in ice shelf melting studies, uses in situ temperature, salinity, and relative velocities at an iceberg's bottom. Climatology estimates of Antarctic iceberg melting based on simulations of small (≤2.2 km), “small-to-medium-sized" (≤10 km), and small-to-giant icebergs (including icebergs >10 km) exhibit differential characteristics: successive inclusion of larger icebergs leads to a reduced seasonality of the iceberg meltwater flux and a shift of the mass input to the area north of 58°S, while less meltwater is released into the coastal areas. This suggests that estimates of meltwater input solely based on the simulation of small icebergs introduce a systematic meridional bias; they underestimate the northward mass transport and are, thus, closer to the rather crude treatment of iceberg melting as coastal runoff in models without an interactive iceberg model. Future ocean simulations will benefit from the improved meridional distribution of iceberg melt, especially in climate change scenarios where the impact of iceberg melt is likely to increase due to increased calving from the Antarctic ice sheet. *pos_lon_deg/*pos_lat_deg.nc - position in longitude/latitude for every iceberg *width/*length/*height.nc - dimensions of the icebergs *lvl*.nc - lateral volume losses of the icebergs *bvl.nc - basal volume loss of the icebergs *icb_vel_u/v.nc - iceberg velocities *frozen_in.nc - logical ...