Southern Ocean Rainfall Increases 28% Since 1979, Affecting Antarctic Cooling
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Annual rainfall on Macquarie Island has increased by 28% since 1979, driven by storms delivering more rain rather than an increase in their number. Researchers estimate this extra rainfall adds roughly 2,300 gigatonnes of freshwater each year across the high-latitude Southern Ocean. The study indicates the Southern Ocean may be cooling itself by 10-15% more than it did in 1979 due to increased evaporation fueling higher rainfall.
Facts First
- Annual rainfall on Macquarie Island has increased by 28% since 1979, adding roughly 260 millimeters per year
- The increase is driven by storms delivering more rain, not by an increase in the total number of storms
- Extra rainfall adds roughly 2,300 gigatonnes of freshwater each year across the high-latitude Southern Ocean
- The Southern Ocean may be cooling itself by 10-15% more than it did in 1979 due to increased evaporation
- The Southern Ocean storm track has gradually shifted closer to Antarctica over time
What Happened
Researchers analyzed 45 years of daily rainfall observations from Macquarie Island located in the Southern Ocean between Tasmania and Antarctica. The study found annual rainfall on the island has increased by 28% since 1979, which is approximately 260 millimeters of additional rain per year. The increase is driven by storms delivering more rain rather than an increase in the total number of storms.
Why this Matters to You
Changes in the Southern Ocean's climate system can influence global weather patterns and ocean currents. The increased rainfall and freshwater input documented in this study may affect the ocean's ability to absorb heat and carbon dioxide, which are processes that influence the global climate. This could have long-term implications for weather extremes you experience and for the stability of coastal environments worldwide.
What's Next
The study, published in Weather and Climate Dynamics, provides a detailed record of changing rainfall patterns. The researchers' methods could be applied to other regions to better understand global climate change. Further monitoring on Macquarie Island and across the Southern Ocean is likely to continue to track these evolving trends.