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Sustained decrease in inland East Antarctic surface mass balance between 2005 and 2020

Abstract

Accurate observations of surface mass balance are pivotal for assessing the Antarctic Ice Sheet mass balance and its link to climate dynamics. Studying regional changes in surface mass balance is challenging due to limited on-site observations and the susceptibility of measurements from snow pits and ice cores to localized disturbances. Satellite data and short-term localized measurements suggest no significant changes or a possible increase in surface mass balance across the East Antarctic Ice Sheet in recent decades, but these findings lack large-scale validation. Here we use observations from mass balance stakes to show a significant negative surface mass balance trend along the inland transect from Zhongshan Station to the Antarctic Ice Sheet summit (Dome A) during the period 2005–2020. The mean surface mass balance trend for the inland section over the 15-year period is −2.01 ± 0.37 kg m−2 yr–2, indicating a 35.5% decrease. This decrease is probably linked to enhanced zonal winds in the upper atmosphere and a deepened low-pressure system in the southern Indian Ocean. The former weakens meridional air transport to Antarctica, while the latter strengthens offshore winds over the study area, reducing onshore water vapour transport. These findings can be used to evaluate and improve regional climate models and refine estimates of contemporary Antarctic mass balance trends.

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Fig. 1: Spatial and temporal trends in SMB along the Zhongshan–Dome A study transect.
The alternative text for this image may have been generated using AI.
Fig. 2: Changes in the 250 hPa (jet level) circulation over high southern latitudes and teleconnection with inland transect precipitation.
The alternative text for this image may have been generated using AI.
Fig. 3: 500 hPa wind anomalies and Z500 trends over the high southern latitudes and the teleconnection between Z500 and inland transect precipitation.
The alternative text for this image may have been generated using AI.
Fig. 4: Trends and anomalies in near-surface winds in the study area from 2005 to 2020.
The alternative text for this image may have been generated using AI.
Fig. 5: Changes in normalized precipitation, snow accumulation, jet wind speed, 10 m V-wind speed and Z500 during the modern record.
The alternative text for this image may have been generated using AI.
Fig. 6: Summary of the changes in atmospheric circulation over the high southern latitudes and their impacts on precipitation in the study area.
The alternative text for this image may have been generated using AI.

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Data availability

The ERA5 atmospheric circulation data that support the findings of this study are available from the Copernicus Climate Data Store at https://cds.climate.copernicus.eu/. Data available via Figshare at https://doi.org/10.6084/m9.figshare.28091900. Source data are provided with this paper.

Code availability

Code used to analyse the data and prepare figures is available upon request from the corresponding author.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant numbers 42276243 and 41922046), the National Key Research and Development Program of China (grant numbers 2023YFC2812601 and 2021YFC2801405) and the Fundamental Research Funds for the Central Universities. We thank CHINARE members for their support and assistance with SMB observations.

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Authors and Affiliations

Authors

Contributions

D.W. and G.S. contributed to the data collection, data analysis, writing the original draft and reviewing and editing. G.S. and H.M. contributed to the research design, data collection and supervision. X.L. contributed to the research design and reviewing and editing. Y.H. contributed to the data analysis. Z.H., C.A., M.D., C.L., S.J., Y.L., S.L. and B.S. contributed to data collection and reviewing and editing. G.Z. and M.v.d.B. contributed to the reviewing and editing. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Guitao Shi.

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The authors declare no competing interests.

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Nature Geoscience thanks the anonymous reviewers for their contribution to the peer review of this work. Primary Handling Editor: Thomas Richardson, in collaboration with the Nature Geoscience team.

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Extended data

Extended Data Fig. 1 Map of the Zhongshan-Dome A traverse route and ERA5 precipitation trends (2005-2020).

a, A total of about 600 surface mass balance stakes were placed at 2 km intervals along the route, with annual surface snow accumulation measured from 2005-2020. Black scatter indicates areas of significant decreasing precipitation trends from linear regression (P < 0.05, two-sided), highlighted by yellow contours. b, Spatially varying annual-mean precipitation trends along the study transect (76°E-78°E, 70°S- 80°S), quantified using linear regression. The left axis shows the starting position, and the lower axis shows the ending position. The x = y axis represents the exact precipitation trend at each point. Stippling denotes trends significant at P < 0.05 (two-sided). c, 200 km annual-mean precipitation trends along the study transect. d, Significance levels of the 200 km running precipitation trends, with blue dashed line indicating P = 0.05.

Extended Data Fig. 2 The field operation scene for recording surface mass balance (SMB) stake heights.

Two personnel are required to measure the bamboo stakes’ height above the snow surface. One aligns a measuring rod vertically and parallel to the ice sheet, while the other, standing 5 meters away, records the height. Each stake is uniquely labeled with a metal plate showing its name and location, and GPS positions are recorded during each campaign. Credit: J. Deng.

Extended Data Fig. 3 Seasonal Maximum Covariance Analysis (MCA) between the 250 hPa zonal wind (U) and precipitation of the study area, with the spatial patterns of the first mode of Z1000 and precipitation in the MCA for the study period (2005-2020).

a, SON b, DJF c, MAM and d, JJA. Areas of significance heterogeneous Pearson correlation (P < 0.05, two-sided) are shown within the yellow contours and marked with black dots. The red line indicates the study transect.

Extended Data Fig. 4 Seasonal Maximum Covariance Analysis (MCA) between the 500 hPa geopotential height (GPH) (Z500) and precipitation of the study area, with the spatial patterns of the first mode of Z500 and precipitation in the MCA for the study period (2005-2020).

a, SON b, DJF c, MAM and d, JJA. Areas of significance heterogeneous Pearson correlation (P < 0.05, two-sided) are shown within the yellow contours and marked with black dots. The red line indicates the study transect.

Extended Data Fig. 5 Tele-correlation and Maximum Covariance Analysis (MCA) between the 1000 hPa geopotential height (GPH) (Z1000) and precipitation of the study area.

a, Pearson correlation between monthly precipitation and Z1000 in the inland area (70°E-85°E, 75°S-82°S). The areas enclosed by the blue and green dashed boxes correspond to the regions depicted in panels b and c, respectively. b, Spatial patterns of Z1000 from the first MCA mode. c, Spatial patterns of precipitation from the first MCA mode. The areas of significant heterogeneous Pearson correlation areas (P < 0.05, two-sided) are shown within the yellow contours and marked with black dots.

Extended Data Fig. 6 Seasonal Maximum Covariance Analysis (MCA) between the 1000 hPa geopotential height (GPH) (Z1000) and precipitation of the study area, with the spatial patterns of the first mode of Z1000 and precipitation in the MCA for the study period (2005-2020).

a, SON b, DJF c, MAM and d, JJA. Areas of significance heterogeneous Pearson correlation (P < 0.05, two-sided) are shown within the yellow contours and marked with black dots. The red line indicates the study transect.

Source data

Source Data Figs. 1 and 5 (download XLSX )

Field measurement source data from surface mass balance stakes along the Zhongshan Station to Dome A study transect.

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Wang, D., Ma, H., Li, X. et al. Sustained decrease in inland East Antarctic surface mass balance between 2005 and 2020. Nat. Geosci. 18, 462–470 (2025). https://doi.org/10.1038/s41561-025-01699-z

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