1	  Supporting	  Information	  	  2	  3	  Does	  ocean-­‐coupling	  matter	  for	  the	  northern	  extra-­‐tropical	  response	  to	  4	  projected	  Arctic	  sea	  ice	  loss?	  

5	  	  Clara	  Deser1*,	  Lantao	  Sun2,	  Robert	  A.	  Tomas1	  and	  James	  Screen3	  6	  	  Submitted	  to	  Geophysical	  Research	  Letters	  December	  2,	  2015	  7	  8	  	  	  	  1	  9	  10	  11	  12	  13	  14	  15	  16	  17	  18	  	  Figure S1. (Top) Seasonal cycle of Arctic sea ice area (106 km2) loss in the late 21stcentury relative to the late 20th century (bars) and the corresponding net surface heat fluxresponse (Wm-2) to the ice loss (curves) in ΔICE_NOM (yellow), ΔICE_SOM (blue) andΔICE_FOM (red) model configurations. Note that the ice area scale has been inverted.
(Bottom) Change in Arctic sea ice concentration (%) from the late 20th century to the late
21st century in autumn (SON; left) and winter (DJF; right) in ΔICE_FOM. 	  	  	  	  2	  19	  20	  21	  22	  23	  24	  25	  26	  27	  28	  	  	  	  Figure	  S2.	  Monthly	  700hPa	  zonal-­‐mean	  zonal	  wind	  responses	  to	  Arctic	  sea	  ice	  loss	  in	   ΔICE_NOM	   (top),	   ΔICE_SOM	   (middle)	   and	   ΔICE_FOM	   (bottom)	   model	  configurations.	   Stippling	   indicates	   where	   the	   response	   is	   statistically	   significant	   at	  the	  95%	  confidence	  level.	  Note	  that	  only	  the	  NH	  is	  shown,	  and	  that	  the	  months	  May-­‐
August	  have	  been	  repeated	  for	  clarity.	  Contours	  show	  the	  20th	  century	  climatology	  (contour	  interval	  of	  5	  ms-­‐1	  with	  the	  zero	  contour	  thickened).	  	  	  	  3	  29	  30	  	  	  31	  32	  33	  34	  35	  36	  37	  38	  39	  40	  41	  42	  	  	  	  Figure	   S3.	   DJF	   zonal-­‐mean	   (left)	   temperature	   (°C)	   and	   (right)	   zonal	   wind	   (ms-­‐1)	  responses	  to	  Arctic	  sea	  ice	  loss	  in	  the	  (a,	  b)	  in ΔICE_NOM,	  (c,	  d)	  ΔICE_SOM	  and	  (e,	  f)	  ΔICE_FOM	  model	  configurations	  (color	  shading:	  color	  bars	  at	  the	  bottom	  of	  each	  column;	   note	   the	   non-­‐linear	   scales).	   Stippling	   indicates	   where	   the	   response	   is	  statistically	   significant	   at	   the	   95%	   confidence	   level.	   Contours	   indicate	   the	   20th	  century	  climatology	  (contour	  interval	  of	  10	  °C	  for	  temperature	  and	  5	  ms-­‐1	  for	  zonal	  wind	  with	  the	  zero	  contour	  thickened).	  	  	  	  	  	  4	  43	  44	  45	  46	  47	  48	  49	  50	  51	  	  	  	  Figure	   S4.	   Annual-­‐mean	   700	   hPa	   zonal	   wind	   (ms-­‐1),	   500	   hPa	   geopotential	   height	  (Z500;	   m),	   and	   SLP	   (hPa)	   responses	   to	   Arctic	   sea	   ice	   loss	   in	   the	   (a,	   b,	   c)	   ΔICE_NOM,	  (d,	  e,	  f)	  ΔICE_SOM	  and	  (g,	  h,	  i)	  ΔICE_FOM	  model	  configurations.	  Stippling	  indicates	  where	  the	  response	  is	  statistically	  significant	  at	  the	  95%	  confidence	  level.	  Contours	  indicate	  the	  20th	  century	  climatology	  (contour	  interval	  of	  5	  ms-­‐1	  for	  zonal	  wind	  with	  the	  zero	  contour	  thickened,	  500	  m	  for	  Z500,	  and	  10	  hPa	  for	  SLP).	  	  5	  52	  	  53	  54	  55	  56	  57	  58	  59	  	  	  Figure	  S5.	  Annual-­‐mean	  surface	  air	  temperature	  (°C;	  land	  only),	  precipitation	  (mm	  d-­‐1)	  and	  SST	  (°C)	  responses	  to	  Arctic	  sea	  ice	  loss	  in	  the	  (a,	  b,	  c)	  ΔICE_NOM,	  (d,	  e,	  f)	  ΔICE_SOM	  and	  (g,	  h,	  i)	  ΔICE_FOM	  model	  configurations.	  Stippling	  indicates	  where	  the	  response	  is	  statistically	  significant	  at	  the	  95%	  confidence	  level.	  	  	  	  	  6	  60	  61	  62	  63	  64	  65	  66	  67	  	  	  Figure	   S6.	   Time	   series	   of	   DJF	   zonal-­‐mean	   zonal	   wind	   response	   (ms-­‐1)	   at	   700	   hPa	  averaged	   over	   55°-­‐70°N	   from	   (a)	   ΔICE_NOM,	   (b)	   ΔICE_SOM,	   and	   (c)	   ΔICE_FOM.	  
Note	   that	   the	   ΔICE_FOM	   experiment	   is	   360	   years	   long,	   while	   the	   ΔICE_NOM	   and	  ΔICE_SOM	   experiments	   are	   260	   years	   long.	   The	   black	   curves	   show	   the	   unfiltered	  DJF	  time	  series,	  and	  the	  red	  curves	  show	  the	  time	  series	  smoothed	  with	  an	  11-­‐year	  running	  mean.	  	  	  7	  68	  69	  70	  71	  Table S1. Details of the model experiments. Acronyms are defined as: NOM (No OceanModel); SOM (Slab Ocean Model); FOM (Full Ocean Model).	  
Experiment
Model configuration
nameArctic sea ice andlocal SST conditions

NOM_20

CAM4

Prescribed from
SOM_20

NOM_21

CAM4

SOM_20

CAM4-SOM

SOM_21

Remarks

No interactive ocean

Prescribed from
SOM_21

No interactive ocean

1980-1999 average

Mixed layer ocean

CAM4-SOM

2080-2099
average

Mixed layer ocean

FOM_20

CCSM4

1980-1999
average

Full-depth
dynamical ocean

FOM_21

CCSM4

2080-2099
average

Full-depth
dynamical ocean	  	  8