Abstract
Abstract
Background
The climate mitigation target of limiting the temperature increase below 2 °C above the pre-industrial levels requires the efforts from all countries. Tracking the trajectory of the land carbon sink efficiency is thus crucial to evaluate the nationally determined contributions (NDCs). Here, we define the instantaneous land sink efficiency as the ratio of natural land carbon sinks to emissions from fossil fuel and land-use and land-cover change with a value of 1 indicating carbon neutrality to track its temporal dynamics in the past decades.
Results
Land sink efficiency has been decreasing during 1957–1990 because of the increased emissions from fossil fuel. After the effect of the Mt. Pinatubo eruption diminished (after 1994), the land sink efficiency firstly increased before 2009 and then began to decrease again after 2009. This reversal around 2009 is mostly attributed to changes in land sinks in tropical regions in response to climate variations.
Conclusions
The decreasing trend of land sink efficiency in recent years reveals greater challenges in climate change mitigation, and that climate impacts on land carbon sinks must be accurately quantified to assess the effectiveness of regional scale climate mitigation policies.
Funder
National Key R&D Program of China
European Space Agency Climate Change Initiative ESA‐CCI RECCAP2 project
European Research Council
Convergence Institute of the French Agence Nationale de la Recherche
JSPS KAKENHI
Publisher
Springer Science and Business Media LLC
Subject
General Earth and Planetary Sciences,Earth and Planetary Sciences (miscellaneous),Management, Monitoring, Policy and Law,Global and Planetary Change
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