Supplemental Material for Evolution of the Atlantic Multidecadal. Variability in a model with an improved North Atlantic Current
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1 1 Supplemental Material for Evolution of the Atlantic Multidecadal 2 Variability in a model with an improved North Atlantic Current 3 Annika Drews 4 GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany Richard J. Greatbatch GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, Faculty of Mathematics and Natural Sciences, University of Kiel, Kiel, Germany Corresponding author address: Annika Drews, GEOMAR Helmholtz Centre for Ocean Research Kiel, Duesternbrooker Weg 20, Kiel, Germany. adrews@geomar.de Generated using v4.3.2 of the AMS LATEX template 1
2 ABSTRACT 11 This document contains supporting figures for the main document. 2
3 12 References Ebisuzaki, W., 1997: A Method to Estimate the Statistical Significance of a Correlation When the Data Are Serially Correlated. J. Climate, 10 (9), , doi: / (1997) :AMTETS 2.0.CO; Rayner, N. A., D. E. Parker, E. B. Horton, C. K. Folland, L. V. Alexander, D. P. Rowell, E. C. Kent, and A. Kaplan, 2003: Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century. J. Geophys. Res., 108 (D14), 4407, doi: /2002jd
4 20 21 LIST OF FIGURES Fig. 1. Mean sea surface height (in m, model years ). The global mean sea level is removed Fig. 2. Fig. 3. Regression maps of surface turbulent (sensitive and latent) heat flux (positive into the atmosphere) on the AMV index at different lag times in years (same as Figure 6 in the main text). However, here, an 11 year running mean filter was applied to the data, instead of a 5 year low pass filter. Units are Wm 2 K 1. Hatching denotes that the correlation coefficients are significantly different from zero at the 95% level according to the method of Ebisuzaki (1997) Regression maps of winter (January-February-March) sea level pressure on the AMV index at different lag times in years (same as Figure 15 in the main text). However, here, an 11 year running mean filter was applied to the data, instead of a 5 year low pass filter. Units are hpa/k. Hatching denotes that the correlation coefficients are significantly different from zero at the 95% level according to the method of Ebisuzaki (1997) Fig. 4. Regression maps of SST on the AMV index at different lag times in years (same as Figure 3 in the main text). Here, a smaller region was chosen to highlight the East Greenland Current region Fig. 5. Fig. 6. Fig. 7. Mean March mixed layer depth (blue colors, in meters) and 15% sea ice extent (black line) in the model (model years ), and 15% sea ice extent from observations (red dashed line; HadISST, , Rayner et al. (2003)) Mean Atlantic Meridional Overturning streamfunction in the model (in Sv, model years ) Regression maps of surface sensible and latent heat flux (positive into the atmosphere) from the uncorrected model on the AMV index at different lag times in years (same as Fig. 6 in the main text, but for the uncorrected model). Units are Wm 2 K 1. Hatching denotes that the correlation coefficients are significantly different from zero at the 95% level according to the method of Ebisuzaki (1997). Note the striking difference between this plot and Figure 6 in the main text Fig. 8. Mean barotropic streamfunction in the model (in Sv, model years ) Fig. 9. Regression maps of sea surface height on the AMV index at different lag times in years. Units are cm/k. Hatching denotes that the correlation coefficients are significantly different from zero at the 95% level according to the method of Ebisuzaki (1997)
5 FIG. 1. Mean sea surface height (in m, model years ). The global mean sea level is removed. 5
6 FIG. 2. Regression maps of surface turbulent (sensitive and latent) heat flux (positive into the atmosphere) on the AMV index at different lag times in years (same as Figure 6 in the main text). However, here, an 11 year running mean filter was applied to the data, instead of a 5 year low pass filter. Units are Wm 2 K 1. Hatching denotes that the correlation coefficients are significantly different from zero at the 95% level according to the method of Ebisuzaki (1997). 6
7 /JCLI-D s1 56 F IG. 3. Regression maps of winter (January-February-March) sea level pressure on the AMV index at different 57 lag times in years (same as Figure 15 in the main text). However, here, an 11 year running mean filter was applied 58 to the data, instead of a 5 year low pass filter. Units are hpa/k. Hatching denotes that the correlation coefficients 59 are significantly different from zero at the 95% level according to the method of Ebisuzaki (1997). 7
8 /JCLI-D s F IG. 4. Regression maps of SST on the AMV index at different lag times in years (same as Figure 3 in the main text). Here, a smaller region was chosen to highlight the East Greenland Current region. 8
9 FIG. 5. Mean March mixed layer depth (blue colors, in meters) and 15% sea ice extent (black line) in the model (model years ), and 15% sea ice extent from observations (red dashed line; HadISST, , Rayner et al. (2003)). 9
10 FIG. 6. Mean Atlantic Meridional Overturning streamfunction in the model (in Sv, model years ). 10
11 FIG. 7. Regression maps of surface sensible and latent heat flux (positive into the atmosphere) from the uncorrected model on the AMV index at different lag times in years (same as Fig. 6 in the main text, but for the uncorrected model). Units are Wm 2 K 1. Hatching denotes that the correlation coefficients are significantly different from zero at the 95% level according to the method of Ebisuzaki (1997). Note the striking difference between this plot and Figure 6 in the main text. 11
12 FIG. 8. Mean barotropic streamfunction in the model (in Sv, model years ). 12
13 /JCLI-D s1 70 F IG. 9. Regression maps of sea surface height on the AMV index at different lag times in years. Units are 71 cm/k. Hatching denotes that the correlation coefficients are significantly different from zero at the 95% level 72 according to the method of Ebisuzaki (1997). 13
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