Alan Robock Department of Environmental Sciences Rutgers University, New Brunswick, New Jersey USA Climate Dynamics 11:670:461 Lecture 5, 9/19/13

Alan Robock Department of Environmental Sciences Fig. 3.3 SST on the Equator (K) (Hovmöller diagram)

Alan Robock Department of Environmental Sciences Surface temperatures DJF 1987/88 El Niño (K) (b) Surface temperature anomalies DJF 1987/88 El Niño (K) Niño3.4 region Fig. 3.4

Alan Robock Department of Environmental Sciences Surface temperatures DJF 1998/99 La Niña (K) (b) Surface temperature anomalies DJF 1998/99 La Niña (K) Fig. 3.5

Alan Robock Department of Environmental Sciences Fig. 3.6 Niño3.4 anomalies with respect to mean 11-month running mean

Alan Robock Department of Environmental Sciences

Alan Robock Department of Environmental Sciences Fig. 3.8 Climatology DJF 900 mb

Alan Robock Department of Environmental Sciences Fig. 3.9 NAO AO

Alan Robock Department of Environmental Sciences Fig Pacific Decadal Oscillation (PDO)

Alan Robock Department of Environmental Sciences Fig Sahel precipitation, July-September 10ºW-10ºE, 11ºN-16ºN

Alan Robock Department of Environmental Sciences Recovery from volcanic eruptions dominates Tropospheric aerosols mask warming (global dimming) Greenhouse gases dominate

Alan Robock Department of Environmental Sciences Temperature index change (with the base period ) since 1950 at seasonal resolution, for the globe (upper line) and for low latitudes (lower line). [This is an update of Figure 7 in Hansen et al. (1999).] Green triangles mark large volcanic eruptions. SST at Nino 3.4 is the 12-month running mean.Hansen et al. (1999) stemp/graphs_v3/Fig.E.pdf

Alan Robock Department of Environmental Sciences Mann et al. (1999)

Alan Robock Department of Environmental Sciences Figure 19: Northern Hemisphere reconstructed temperature change since 200 AD

Alan Robock Department of Environmental Sciences From IPCC AR4 Technical Summary