Arctic Sea Ice Snow Melt Onset Dates, 1979-2025

Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures, Version 5 provides yearly melt onset dates derived from satellite microwave radiometer measurements. The data are gridded on a 25 km Northern Hemisphere Polar Stereographic projection and include value-added statistics like mean, earliest, latest, range, and standard deviation of melt dates per grid cell. One browse image is available for each yearly file and statistical field.

Use Cases

• [Tracking long-term Arctic climate change] based on [yearly snow melt onset dates from 1979 onward]
• [Analyzing spatial variability in melt timing] based on [gridded data and per-cell statistical fields like standard deviation]
• [Validating sea ice or climate models] based on [satellite-derived melt onset observations]
• [Studying melt season characteristics] based on [calculated statistics for earliest, latest, and range of melt dates]

Strengths

• [Long temporal record] covering at least 44 years from 1979 through 2022 or 2025, depending on the source
• [Value-added processing] includes per-grid-cell statistics like mean, min, max, range, and standard deviation of melt onset dates
• [Multi-instrument consistency] derived from three satellite sensor series: SMMR, SSM/I, and SSMIS

Limitations

• [Conflicting temporal endpoint] sources disagree on the latest year covered, with one stating 2022 and another 2025
• [Sparse metadata] column names and exact data formats (beyond BIN, HTML, ISO) are not specified in the provided descriptions
• [Spatial resolution] is fixed at a 25 km grid, which may limit analysis of fine-scale processes

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Derived from Scanning Multichannel Microwave Radiometer (SMMR), Special Sensor Microwave/Imager (SSM/I), and Special Sensor Microwave Imager/Sounder (SSMIS) brightness temperature measurements.

Time Range

1979 to 2025 (conflict: one source states 1979-2022, another 1979-2025)

Freshness

2026-04-09 21:56:23.368209

Geography

Arctic sea ice, gridded to the Northern Hemisphere Polar Stereographic projection.