Iceberg A23a

A23a is currently the world’s largest iceberg. It was stuck in the Weddell Sea for many years before slowly beginning to move out towards open ocean in the Southern Ocean.

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Contributions by: Kim Erickson

Satellite imagery of this event:

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Iceberg A23a Throughout March

Description:

The world’s largest iceberg, A23a, is on the move in the Southern Ocean. This chunk of ice larger than the state of Rhode Island passed to the north of the Orkney Islands as the month of March progressed.


Phenomena: Ocean Sea Ice

Satellite: NOAA-20 NOAA-21 S-NPP

Product: Near Constant Contrast

Instrument: VIIRS

A23a Throughout the Month of February

Description:

Iceberg A23a spent the month of February drifting around in the Weddell Sea between the South Orkney and South Shetland Islands of Antarctica.


Phenomena: Sea Ice

Satellite: NOAA-20 NOAA-21 S-NPP

Product: Near Constant Contrast

Instrument: VIIRS

A Clear Mid-February View of A23a

Description:

NOAA-20 catches a clear view of iceberg A23a.


Phenomena: Sea Ice

Satellite: NOAA-20

Product: Visible (I1)

Instrument: VIIRS

Iceberg A23a Through January

Description:

Iceberg A23a continues is slow journey northeastward in the Southern Ocean.


Phenomena: Sea Ice

Satellite: NOAA-20 NOAA-21 S-NPP

Product: Near Constant Contrast

Instrument: VIIRS

A23a in Early January

Description:

Iceberg A23a as seen in early January.


Phenomena: Sea Ice

Satellite: NOAA-20 NOAA-21 S-NPP

Product: Day/Night Band

Instrument: VIIRS

Where is Iceberg A23a?

Description:

Where in the world is the largest iceberg, A23a? This imagery highlights the location of this icy behemoth.


Phenomena: Sea Ice

Satellite: GOES-16

Product: GeoColor

Instrument: ABI

Iceberg A23a Over the Month of December

Description:

Iceberg A23a – the world’s largest – was on the move through the end of 2023.


Phenomena: Sea Ice

Satellite: NOAA-20 NOAA-21 S-NPP

Product: Day/Night Band

Instrument: VIIRS

High Resolution View of A23a

Description:

A high resolution view of A23a, captured by NOAA-21.


Phenomena: Sea Ice

Satellite: NOAA-21

Product: Visible (I1)

Instrument: VIIRS

Iceberg A23a Is on the Move in the Weddell Sea

Description:

Say hello to iceberg A23a, the largest iceberg in the world. This extraordinary month-long time lapse captures its journey from the Weddell Sea into open ocean waters.


Phenomena: Sea Ice

Satellite: NOAA-20 NOAA-21 S-NPP

Product: Near Constant Contrast

Instrument: VIIRS