Lv et al. (2025) Decadal-Scale Warming Signals in Antarctic Ice Sheet Interior Revealed by L-Band Passive Microwave Observations from 2015 to 2025

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Identification

• Journal: Remote Sensing
• Year: 2025
• Date: 2025-11-19
• Authors: Shaoning Lv, Yin Hu, Jun Wen
• DOI: 10.3390/rs17223757

Research Groups

Not explicitly mentioned in the provided text.

Short Summary

This study analyzed ten years of SMAP satellite brightness temperature (TB) data across Antarctica, revealing a significant warming trend of over 1.5 K per decade in West Antarctica, primarily correlated with internal ice temperatures at 500–2000 m depth, but not originating from increasing internal ice shelf temperatures.

Objective

• To examine changes in passive microwave brightness temperature (TB) across Antarctica using ten years of SMAP satellite data to understand its thermal behavior and implications for sea-level projections and ice shelf assessments.

Study Configuration

• Spatial Scale: Antarctic ice sheet (West Antarctica, East Antarctica, Antarctic region, Antarctic margins).
• Temporal Scale: Ten years (2015–2025).

Methodology and Data

• Models used: τ-z model, general modeling data for effective soil temperature inference.
• Data sources: Soil Moisture Active Passive (SMAP) satellite passive microwave brightness temperature (TB) data.

Main Results

• West Antarctica exhibited a stronger warming trend, with brightness temperature (TB) increasing by over 1.5 K over a decade.
• East Antarctica remained relatively stable, showing only seasonal summer warming and winter cooling.
• TB in the Antarctic region correlates best with internal temperatures at depths of 500–2000 m, as indicated by the effective soil temperature.
• The total enthalpy is inconsistent with the TB trend and exhibits the opposite effect when combined with the sensing depth.
• The observed TB warming trend on the western side of Antarctica over the past decade does not originate from increasing temperatures within the internal ice shelves, which differs from temperature increases at the Antarctic margins.

Contributions

• Provides a decade-long analysis of Antarctic thermal behavior using SMAP passive microwave data, identifying distinct regional warming patterns.
• Establishes a correlation between satellite-derived TB and internal ice temperatures at specific depths (500–2000 m).
• Differentiates the origin of the observed West Antarctic TB warming trend from internal ice shelf temperature increases, clarifying its nature compared to warming at Antarctic margins.

Funding

Not explicitly mentioned in the provided text.

Citation

@article{Lv2025DecadalScale,
  author = {Lv, Shaoning and Hu, Yin and Wen, Jun},
  title = {Decadal-Scale Warming Signals in Antarctic Ice Sheet Interior Revealed by L-Band Passive Microwave Observations from 2015 to 2025},
  journal = {Remote Sensing},
  year = {2025},
  doi = {10.3390/rs17223757},
  url = {https://doi.org/10.3390/rs17223757}
}