Oceanic Origin of A Recent La Nina-Like Trend in the Tropical Pacific |
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Authors: | ZHANG Liping WU Lixin and YU Lisan |
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Institution: | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100,Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100,Department of Oceanography, Woods Hole Oceanography Institute, MA 02543, USA |
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Abstract: | Global ocean temperature has been rising since the late 1970s at a speed
unprecedented during the past century of recordkeeping. This accelerated
warming has profound impacts not only on the marine ecosystem and oceanic
carbon uptake but also on the global water cycle and climate. During this
rapid warming period, the tropical Pacific displays a pronounced La
Nina-like trend, characterized by an intensification of west--east SST
gradient and of atmospheric zonal overturning circulation, namely the Walker
circulation. This La Nina-like trend differs from the El Nino-like
trend in warm climate projected by most climate models, and cannot be
explained by responses of the global water cycle to warm climate. The
results of this study indicate that the intensification of the zonal SST
gradient and the Walker circulation are associated with recent strengthening
of the upper-ocean meridional overturning circulation. |
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Keywords: | tropical Pacific warming trend hydrological cycle subtropical tropical cell |
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