Abstract
Evidence is presented that the recent trend patterns of surface air temperature and precipitation over the land masses surrounding the North Atlantic Ocean (North America, Greenland, Europe, and North Africa) have been strongly influenced by the warming pattern of the tropical oceans. The current generation of atmosphere–ocean coupled climate models with prescribed radiative forcing changes generally do not capture these regional trend patterns. On the other hand, even uncoupled atmospheric models without the prescribed radiative forcing changes, but with the observed oceanic warming specified only in the tropics, are more successful in this regard. The tropical oceanic warming pattern is poorly represented in the coupled simulations. Our analysis points to model error rather than unpredictable climate noise as a major cause of this discrepancy with respect to the observed trends. This tropical error needs to be reduced to increase confidence in regional climate change projections around the globe, and to formulate better societal responses to projected changes in high-impact phenomena such as droughts and wet spells.









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Notes
We also reconstructed the trends using a \( {\mathbf{G}}\left( {{\mathbf{X}}_{\text{obs}} } \right) \) derived from the CCM3 patch experiment (Barsugli et al. 2006), and compared them over the Atlantic Rim land masses with the ensemble-mean trends from the CCM3 GLB simulations (Table 2). The pattern correlations (r.m.s. magnitude ratios) were 0.70 (0.85) and 0.92 (1.11) for surface temperature and precipitation. With the land-averaged trends removed, the pattern correlations (r.m.s. magnitude ratios) were 0.68 (0.88) and 0.92 (1.10) for surface and temperature and precipitation.
Note that although the observed tropical SST trends are identical in the reconstruction and the GLB simulations, they produce slightly different trend responses around the globe because the reconstruction is linear and the GLB simulations are nonlinear.
Dai et al. (2004) show that the global PDSI trends over 1950–2002 were mostly associated with changes of precipitation (see their Fig. 7). The poor representation of PDSI trends in the coupled simulations in Fig. 9 is also mostly associated with the poor representation of regional precipitation trends in those simulations, which is itself strongly associated with the poor representation of the spatial variation of the tropical SST trends in those simulations.
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Acknowledgments
We thank E. Schneider for his comments on an earlier version of manuscript that helped clarify the role of the tropical SST biases on remote trends in the coupled model simulations. The Max Planck Institute for Meteorology kindly provided the ECHAM5 code used in this study. Our own simulations were performed at the NOAA ESRL High Performance Computing Systems (HPCS) facility. This work was partly supported by NOAA’s Climate Program Office.
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Shin, SI., Sardeshmukh, P.D. Critical influence of the pattern of Tropical Ocean warming on remote climate trends. Clim Dyn 36, 1577–1591 (2011). https://doi.org/10.1007/s00382-009-0732-3
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DOI: https://doi.org/10.1007/s00382-009-0732-3


