ICESat-2 Sea Ice Thickness 2023

  • Released Tuesday, April 25, 2023

One of the big challenges in polar science is measuring the thickness of the floating sea ice that blankets the Arctic and Southern Oceans. Newly formed sea ice might be only a few inches thick, whereas sea ice that survives several winter seasons can grow to several feet in thickness (over ten feet in some places).

Sea ice thickness is typically estimated by first measuring sea ice freeboard - how much of the floating ice can be observed above sea level. Sea ice floats slightly above sea level because it is less dense than water.

NASA’s ICESat-2 satellite measures the Earth’s surface height by firing green laser pulses towards Earth and timing how long it takes for those laser pulses to reflect back to the satellite. Ice freeboard is calculated by differencing the heights of the ice surface and areas of open water next to the ice. Additional information including the depth and density of the snow layer on top of the ice is needed to convert this freeboard measurement to sea ice thickness. New state-of-the-art snow accumulation models have been developed to provide this extra data in preparation for the launch of ICESat-2.

The very high precision of the ICESat-2 laser has enabled us for to measure the thickness of very thin sea ice for the first time. As the Arctic warms rapidly it is becoming increasingly dominated by a younger and thinner ice cover, making these new measurements extremely invaluable for understanding our changing polar regions.

Print resolution image showing ICESat-2 sea ice thickness data for March 2019

Print resolution image showing ICESat-2 sea ice thickness data for March 2019

Print resolution image showing ICESat-2 sea ice thickness data for March 2020

Print resolution image showing ICESat-2 sea ice thickness data for March 2020

Print resolution image showing ICESat-2 sea ice thickness data for March 2021

Print resolution image showing ICESat-2 sea ice thickness data for March 2021

Print resolution image showing ICESat-2 sea ice thickness data for March 2022

Print resolution image showing ICESat-2 sea ice thickness data for March 2022



Credits

Please give credit for this item to:
NASA's Scientific Visualization Studio

Release date

This page was originally published on Tuesday, April 25, 2023.
This page was last updated on Monday, July 15, 2024 at 12:11 AM EDT.


Series

This visualization can be found in the following series:

Datasets used in this visualization

  • Sea Ice Freeboard [ICESat-2: Advanced Topographic Laser Altimeter System (ATLAS)]

    ID: 1056
    Sensor: Advanced Topographic Laser Altimeter System (ATLAS)Dates used: Nov 2018 - April 2021

Note: While we identify the data sets used in these visualizations, we do not store any further details, nor the data sets themselves on our site.