Iceberg D-31 Calves from the Eastern Fimbul Ice Shelf

By LT Falon M. Essary, USN
U.S. National Ice Center
January 28, 2022

SUITLAND, MD — The U.S National Ice Center (USNIC) confirmed that iceberg D-31 has calved from the Fimbul Ice Shelf on the Princess Martha Coast of Antarctica. As of January 26th, D-31 was centered at 69° 54' South and 2° 20' East and measures 16 nautical miles on its longest axis and 2 nautical miles on its widest axis.

The new iceberg was first spotted by USNIC Analyst, Angela Ottoson, and confirmed by USNIC Analyst, Christopher Readinger, using the Sentinel-1A image below.

Iceberg names are derived from the Antarctic quadrant in which they were originally sighted. The quadrants are divided counter-clockwise in the following manner:

A = 0-90W (Bellingshausen/Weddell Sea)
B = 90W-180 (Amundsen/Eastern Ross Sea)
C = 180-90E (Western Ross Sea/Wilkesland)
D = 90E-0 (Amery/Eastern Weddell Sea)

When first sighted, an iceberg’s point of origin is documented by USNIC. The letter of the quadrant, along with a sequential number, is assigned to the iceberg. For example, C-19 is sequentially the 19th iceberg tracked by USNIC in Antarctica between 180-90E (Quadrant C).

Icebergs with letter suffixes have calved from already named icebergs, where the letters are added in sequential order. For example, C-19D is the 4th iceberg to calve off the original C-19 iceberg.

Satellite image of Iceberg D-31
Figure 1: Sentinel-1A image of D-31 from January 26, 2022

For more information, please contact:
National Ice Center
Command Duty Officer
Voice: (301) 943-6977
Twitter: @usnatice
Facebook: @usnatice

The U.S. National Ice Center is a tri-agency center operated by the Navy, NOAA, and Coast Guard and provides global to tactical scale ice and snow products, ice forecasting, and related environmental intelligence services for the United States government.

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