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The global NPP dependence on ENSO: La Niña and the extraordinary year of 2011
Author(s) -
Bastos A.,
Running Steven W.,
Gouveia Célia,
Trigo Ricardo M.
Publication year - 2013
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1002/jgrg.20100
Subject(s) - environmental science , primary production , la niña , carbon sink , el niño southern oscillation , climatology , subtropics , sink (geography) , ecosystem , precipitation , carbon cycle , climate change , atmospheric sciences , northern hemisphere , geography , geology , oceanography , ecology , meteorology , cartography , biology
Global ecosystems remove about 25% of anthropogenic CO 2 emissions; however, the response of the land sink to climate variability and change is not yet fully understood. In 2011, the highest global value of net primary production (NPP) since 2000 was registered on the Moderate Resolution Imaging Spectroradiometer record, together with the highest value on the Carbon Dioxide Information Analysis Center record of carbon land sink strength since 1959. Here we show that El Niño/Southern Oscillation (ENSO) is responsible for much of the variability observed in the land sink and that the high NPP anomaly observed in 2011 was largely influenced by the strongest La Niña since the 1970s that lasted from late 2010 to early 2012. ENSO explains more than 40% of global NPP variability, mainly driven by the response of Southern Hemisphere ecosystems, particularly in tropical and subtropical regions. Water availability, controlled by temperature and precipitation anomalies, appears to be the main factor driving the regional response of NPP to ENSO.