Data

Some of the key public climate datasets I have developed and continue to maintain.

Derived ICESat-2 sea ice thickness data

ICESat-2 L4 monthly gridded winter Arctic sea ice thickness (IS2SITMOGR4)

This dataset reports monthly, gridded (25 km x 25 km) winter sea ice thickness across the Arctic Ocean. Currently at Version 3, Version 1 and 2 deprecated but still available on the NSIDC,

Data: https://nsidc.org/data/IS2SITMOGR4

Citation: Petty, A. A., N. Kurtz, R. Kwok, T. Markus, T. A. Neumann and N. Keeney. 2023. ICESat-2 L4 Monthly Gridded Sea Ice Thickness, Version 3. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: 10.5067/ZCSU8Y5U1BQW.

Data also hosted unofficially on AWS to enable more rapid cloud-native analysis:

Raw NetCDF-4 files: https://icesat-2-sea-ice-us-west-2.s3.us-west-2.amazonaws.com/IS2SITMOGR4_V3/netcdf/
Zarr files (analysis ready cloud optimized): https://icesat-2-sea-ice-us-west-2.s3.us-west-2.amazonaws.com/IS2SITMOGR4_V3/zarr/

These data are also described and analyzed in an online Jupyter Book: https://www.icesat-2-sea-ice-state.info

Data are also featured in this NASA/ESA Earth Observing Dashboard. I did not choose the projection..!

ICESat-2 L4 monthly gridded summer Arctic sea ice thickness (IS2SITMOGR4S)

Associated paper currently in review, dataset should be considered preliminary/experimental.

Data: https://zenodo.org/records/15375596.

Citation: Petty, A. (2025). Monthly gridded summer Arctic sea ice thickness from ICESat-2, v1 [Data set]. Zenodo. https://doi.org/10.5281/zenodo.15375597

ICESat-2 L4 along-track Arctic sea ice thickness (IS2SITDAT4)

This dataset reports daily, along-track winter sea ice thickness across the Arctic Ocean at the raw ATL10 segment scale (around 20 m) and also 10 km means.

Data: https://nsidc.org/data/IS2SITDAT4

Citation: Petty, A. A., N. T. Kurtz, R. Kwok, T. Markus, and T. A. Neumann. 2022. ICESat-2 L4 Along-Track Sea Ice Thickness, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: 10.5067/JTI5YG3S6VAJ.

Derived ICESat sea ice thickness data

ICESat L4 Seasonal Gridded Sea Ice Thickness, Version 1 (ISSITGR4)

This dataset reports seasonally, gridded (25 km x 25 km) winter sea ice thickness across the Arctic Ocean during the ICESat campaign periods. NESOSIM v1.1 snow loading is used for processing, as in IS2SITMOGR4 (V2).

Data: https://nsidc.org/data/ISSITGR4

Citation: Petty, A. A., N. Kurtz, 2023. ICESat L4 Seasonal Gridded Sea Ice Thickness, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi:10.5067/1S5M59IQ0OK3.

Official ICESat-2 sea ice data products

ATLAS/ICESat-2 L3B ATL20 Daily and Monthly Gridded Sea Ice Freeboard (ATL20)

This dataset (ATL20) contains daily and monthly gridded (25 km x 25 km) estimates of sea ice freeboard, derived from along-track freeboard estimates in the ATLAS/ICESat-2 L3A Sea Ice Freeboard product (ATL10).

Data: https://nsidc.org/data/ATL20/

Citation: Petty, A. A., R. Kwok, M. Bagnardi, A. Ivanoff, N. Kurtz, J. Lee, J. Wimert, and D. Hancock. 2021. ATLAS/ICESat-2 L3B Daily and Monthly Gridded Sea Ice Freeboard, Version 2. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi:10.5067/ATLAS/ATL20.002.

ATLAS/ICESat-2 L3B Daily and Monthly Gridded Polar Sea Surface Height Anomaly (ATL21)

This dataset contains daily and monthly gridded polar sea surface height (SSH) anomalies, derived from the along-track ATLAS/ICESat-2 L3A Sea Ice Height product (ATL10, V4).

Data: https://nsidc.org/data/ATL21/

Citation: Petty, A. A., R. Kwok, M. Bagnardi, N. Kurtz, J. Wimert, J. Lee, and D. Hancock. 2021. ATLAS/ICESat-2 L3B Daily and Monthly Gridded Polar Sea Surface Height Anomaly, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: 10.5067/ATLAS/ATL21.001.

Snow on sea ice data

NASA Eulerian Snow On Sea Ice Model (NESOSIM) version 1.1 (1980-2024)

This dataset contains Winter Arctic sea ice snow depth and density across the Arctic Ocean and peripheral seas on a North Polar Stereographic projection (EPSG: 3413).

Data archive: https://doi.org/10.5281/zenodo.5164313.

Code archive: https://doi.org/10.5281/zenodo.6342069.

NESOSIM upgrade reference: Petty A. A., N. Keeney, A. Cabaj, P. Kushner, M. Bagnardi (2023), Winter Arctic sea ice thickness from ICESat-2: upgrades to freeboard and snow loading estimates and an assessment of the first three winters of data collection, The Cryosphere, 17, 127–156, doi: 10.5194/tc-17-127-2023.

Original paper reference: Petty, A. A., M. Webster, L. N. Boisvert, T. Markus (2018), The NASA Eulerian Snow on Sea Ice Model (NESOSIM) v1.0: Initial model development and analysis, Geosci. Model Dev., doi: 10.5194/gmd-11-4577-2018.

NASA Eulerian Snow On Sea Ice Model (NESOSIM) v1.0 (2000-2015)

This dataset contains the original estimates of winter Arctic sea ice snow depth and density from the NASA Eulerian Snow On Sea Ice Model (NESOSIM) version 1.0.

Data: https://earth.gsfc.nasa.gov/cryo/data/nasa-eulerian-snow-sea-ice-model-nesosim.

Citation: Petty, A. A., M. Webster, L. N. Boisvert, T. Markus (2018), The NASA Eulerian Snow on Sea Ice Model (NESOSIM) v1.0: Initial model development and analysis, Geosci. Model Dev., doi: 10.5194/gmd-11-4577-2018.