What causes sea level rise
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Causes of Sea Level Rise
Understanding the causes of sea level rise is crucial for predicting future changes and mitigating their impacts. This article synthesizes recent research to elucidate the primary factors contributing to sea level rise.
Thermal Expansion and Ocean Warming
Thermal Expansion of Ocean Water: One of the primary drivers of sea level rise is the thermal expansion of ocean water. As the atmosphere warms due to increased greenhouse gas concentrations, the ocean absorbs much of this heat, causing the water to expand. This process, known as the steric component, has been a significant contributor to sea level rise, particularly since the 1970s Frederikse2020Cazenave2014Munk2003+1 MORE. Recent studies estimate that thermal expansion accounts for approximately 30% of the observed sea level rise from 1993 to 2007 .
Ice-Mass Loss
Melting of Glaciers and Ice Sheets: The melting of land-based ice, including glaciers and ice sheets in Greenland and Antarctica, is another major factor. Ice-mass loss has been identified as the dominant contributor to sea level rise since 1900, causing twice as much rise as thermal expansion Frederikse2020Cazenave2014. The Greenland Ice Sheet, in particular, has seen increased melting rates, contributing significantly to the acceleration of sea level rise since the 1970s Frederikse2020Cazenave2014Mimura2013.
Terrestrial Water Storage
Changes in Terrestrial Water Storage: Human activities such as groundwater extraction, dam construction, and deforestation also impact sea levels. The impoundment of water in artificial reservoirs, for instance, led to lower-than-average sea level rise rates during the 1970s Frederikse2020Cazenave2014. Conversely, the release of water from these reservoirs and other land-based water sources contributes to rising sea levels.
Anthropogenic Factors
Human-Induced Climate Change: The rapid increase in CO2 and other greenhouse gases over the past 200 years has been a significant driver of sea level rise. Studies attribute approximately 75% of the 20th-century sea level rise to anthropogenic factors, with natural forcings such as volcanic and solar radiative effects playing a minor role .
Regional Variability
Regional Differences: Sea level rise is not uniform across the globe. Regional variations are influenced by factors such as ocean currents, land subsidence, and local climatic conditions. These differences mean that the impacts of sea level rise can vary significantly from one coastal area to another Meier2002Cazenave2003.
Conclusion
Sea level rise is a complex phenomenon driven by multiple factors, including thermal expansion, ice-mass loss, and changes in terrestrial water storage. Human-induced climate change has significantly accelerated these processes, leading to increased rates of sea level rise in recent decades. Understanding these causes is essential for developing effective strategies to mitigate and adapt to the impacts of rising sea levels.
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