Abstract

The global mean surface air temperature (GMST) shows multidecadal variability over the period of 1910–2013, with an increasing trend. This study quantifies the contribution of hemispheric surface air temperature (SAT) variations and individual ocean sea surface temperature (SST) changes to the GMST multidecadal variability for 1910–2013. At the hemispheric scale, both the Goddard Institute for Space Studies (GISS) observations and the Community Earth System Model (CESM) Community Atmosphere Model 5.3 (CAM5.3) simulation indicate that the Northern Hemisphere (NH) favors the GMST multidecadal trend during periods of accelerated warming (1910–1945, 1975–1998) and cooling (1940–1975, 2001–2013), whereas the Southern Hemisphere (SH) slows the intensity of both warming and cooling processes. The contribution of the NH SAT variation to the GMST multidecadal trend is higher than that of the SH. We conduct six experiments with different ocean SST forcing, and find that all the oceans make positive contributions to the GMST multidecadal trend during rapid warming periods. However, only the Indian, North Atlantic, and western Pacific oceans make positive contributions to the GMST multidecadal trend between 1940 and 1975, whereas only the tropical Pacific and the North Pacific SSTs contribute to the GMST multidecadal trend between 2001 and 2013. The North Atlantic and western Pacific oceans have important impacts on modulating the GMST multidecadal trend across the entire 20th century. Each ocean makes different contributions to the SAT multidecadal trend of different continents during different periods.

Highlights

  • An apparent global mean surface air temperature (GMST) slowdown, known as the ‘global warming hiatus’, occurred between 2001 to 2013 (Kosaka and Xie 2013; England et al 2014; Fyfe and Gillett 2014; Santer et al 2014; Sillmann et al 2014; Smith 2013; Trenberth and Fasullo 2013)

  • We carry out a series of atmospheric general circulation model (AGCM) sea surface temperature (SST) forcing experiments to quantify the effect of regional SSTs corresponding to the ocean modes of the same regions on the GMST multidecadal trend during the periods 1910–1945, 1940–1975, 1975–1998, and 2001–2013, and quantify the continental surface air temperature (SAT) trends tied to regional SST variation

  • The GMST (LSAT) trends show an GMST trends for the period (a)

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Summary

Introduction

An apparent global mean surface air temperature (GMST) slowdown, known as the ‘global warming hiatus’, occurred between 2001 to 2013 The global warming hiatus is tied to a La-Niñalike decadal cooling and is part of the internal variability of the climate (Kosaka and Xie 2013, 2016; Xie et al 2016; Xie and Kosaka 2017), and the changes in SST in the eastern tropical Pacific play a key role in modulating GMST variability (England et al 2014; Li et al 2015, 2017; Yao et al 2017; Zhang et al 2010). The contribution of SST variability from different regions to GMST multidecadal trend is distinct during different periods On this basis, we carry out a series of atmospheric general circulation model (AGCM) SST forcing experiments to quantify the effect of regional SSTs corresponding to the ocean modes of the same regions on the GMST multidecadal trend during the periods 1910–1945, 1940–1975, 1975–1998, and 2001–2013, and quantify the continental surface air temperature (SAT) trends tied to regional SST variation.

Data and methodology
AGCM simulations
Statistical method
Model performance
Results
Multidecadal continental SAT trends tied to SST changes
Summary and discussions
Full Text
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