Symposium in Honor of Maurice Blackmon Clara Deser

Symposium in Honor of Maurice Blackmon Clara Deser, NCAR

Symposium in Honor of Maurice Blackmon Mentor Extraordinaire CDC Postdoc 1990 -1991 Res. Sci. 1992 -1996 NCAR Scientist 1997 - Clara Deser, NCAR

CGD Women Scientists Hired by Maurice Blackmon Clara Deser Bette Otto-Bliesner Marika Holland

Blackmon and Bjerknes: Air-Sea Interaction in the North Atlantic Clara Deser, NCAR

Blackmon J. Bjerknes Synoptic Meteorology ENSO North Atlantic Air-Sea Interaction

Composite SLP, SST High (1904, 1913, 1920) minus Low (1902, 1909, 1915) Year-to-year variability 1920 -1924 minus 1894 -1898 Multi-decadal trends: Ocean forcing atmosphere? “Atlantic Air-Sea Interaction” Jacob Bjerknes, 1964, Adv. in Geophysics 82 pp

Composite SLP, SST High (1904, 1913, 1920) minus Low (1902, 1909, 1915) Year-to-year variability: L C W H 1920 -1924 minus 1894 -1898 Multi-decadal trends: Ocean forcing atmosphere? “Atlantic Air-Sea Interaction” Jacob Bjerknes, 1964, Adv. in Geophysics 82 pp

Composite SLP, SST High (1904, 1913, 1920) minus Low (1902, 1909, 1915) Year-to-year variability: Atmosphere forcing ocean L C W H 1920 -1924 minus 1894 -1898 Multi-decadal trends: Ocean forcing atmosphere? “Atlantic Air-Sea Interaction” Jacob Bjerknes, 1964, Adv. in Geophysics 82 pp

Composite SLP, SST High (1904, 1913, 1920) minus Low (1902, 1909, 1915) Year-to-year variability: Atmosphere forcing ocean L C W H L 1920 -1924 minus 1894 -1898 Multi-decadal trends: Ocean forcing atmosphere? C W H “Atlantic Air-Sea Interaction” Jacob Bjerknes, 1964, Adv. in Geophysics 82 pp

Composite SLP, SST High (1904, 1913, 1920) minus Low (1902, 1909, 1915) Year-to-year variability: Atmosphere forcing ocean L C W H L 1920 -1924 minus 1894 -1898 Multi-decadal trends: Ocean forcing atmosphere? C W H

Gulf Stream “Warming” (Bjerknes, 1964) +3 °C 1890 1900 1910 1920 1930

Composite SLP, SST High (1904, 1913, 1920) minus Low (1902, 1909, 1915) Year-to-year variability: Atmosphere forcing ocean L C W H L 1920 -1924 minus 1894 -1898 Multi-decadal trends: Ocean forcing atmosphere? C W H “Atlantic Air-Sea Interaction” Jacob Bjerknes, 1964, Adv. in Geophysics 82 pp

North Atlantic Air-Sea Interaction Revisited “Surface Climate Variations over the North Atlantic Ocean during Winter: 1900 -1989” Deser and Blackmon (J. Climate 1993) “Interdecadal Variations in North Atlantic Sea Surface Temperature and Associated Atmospheric Conditions” Kushnir (J. Climate 1994) Comprehensive Ocean-Atmosphere Data Set (COADS) NOAA OGP “Atlantic Climate Change Program”

COADS Data Coverage 1861 -1880 1921 -1940 1881 -1900 1941 -1960 1901 -1920 1961 -1980 Percent of months with data

Warm minus Cold Years 50 -60 N Year-to-year variability: Atmosphere forcing ocean C W LW C H W Kushnir 1994 H L L C W H

1950 -1964 minus 1970 -1984 Multi-decadal trends: Ocean forcing atmosphere? W Kushnir 1994 L

Deser and Blackmon (1993) Objective Analysis of Sea Surface Temperature Variability EOF 2 (1900 -1989) - + Sea Ice SST 1960 1970 1980 1990

Deser and Blackmon (1993) Objective Analysis of Sea Surface Temperature Variability EOF 2 (1900 -1989) - Associated Surface Winds + C W Sea Ice SST 1960 1970 1980 1990

Deser and Blackmon (1993) Objective Analysis of Sea Surface Temperature Variability EOF 2 (1900 -1989) - Associated Surface Winds + C W SST, Air T Sea Ice SST 1960 1970 1980 1990

Deser and Blackmon (1993) Objective Analysis of Sea Surface Temperature Variability EOF 2 (1900 -1989) - Associated Surface Winds ICE + C W SST, Air T Sea Ice ICE SST 1960 1970 1980 1990

Atmospheric Response to North Atlantic Sea Ice and Sea Surface Temperature Anomalies Recent Work

Atmospheric Response to North Atlantic Sea Ice and Sea Surface Temperature Anomalies Recent Work Shiling Peng with Ting, Whittaker, Hoerling, Alexander, Li NOAA Climate Diagnostics Center “The Transient Atmospheric Circulation Response to North Atlantic SST and Sea Ice Anomalies” (Deser, Tomas and Peng: J. Climate 2007)

Transient Atmospheric Response Atmospheric GCM Experiments (NCAR CCM 3) Dec 1 Initial Condition 1 Apr 30 Imposed SST Anomaly SST climatology + anomaly +6 °C Initial Condition 240 SST climatology + anomaly