1. Southern California Coast Observed Temperature Anomalies Observed Salinity Anomalies Geostrophic Along-shore Currents Warming Trend Low Frequency Salinity variations North-East Pacific - Mean Surface Temperature California Current USA Model Domain CalCOFI In-Situ Observations 1950 – 2000 (high density sampling domain) C Section A Figure (above) : Vertical EOFs 1 along SECTION A for the CalCOFI temperature and (c,d) salinity anomalies. The seasonal cycle is removed. (e,f) EOF 1 for geostrophic alongshore currents relative to 500 m. In (b) and (d) the black line represent the domain average. CLIMATE CHANGE and EDDIES in the GULF of ALASKA Global Warming may lead to an increase in precipitation over Alaska and Canada. We investigate the effects of enhanced coastal buoyancy fluxes on the generation/dynamics of large scale coastal eddy and on large scale mixing of nutrients in the Gulf of Alaska. 1998/02/13 1998/03/05 1998/03/25 m Haida Eddies Sitka Eddy Sea Surface Height [m] with V. Combes (GaTech). NSF support. WARMING of the CALIFORNIA CURRENT An eddy resolving model of the California Current is combined with 52 year-long in situ observations of Temperature and Salinity from the California Cooperative Fisheries Investigation. The goal is to elucidate the dynamics of upper ocean warming and their effect on ocean biology. 60° E110° E160° E 150° W 100° W 0°0° 30° S 30° N India China INDO-PAC ENSO February 1998 SSH anomaly Australia 024-2-4 cm INDO-PACIFIC THEMROCLINE DYNAMICS, Coupled Ocean-Atmosphere Modeling Approach The adjustment process of the indo-pacific thermocline and regional scale circulations on ENSO to Decadal timescales, are investigated using a coupled ocean-atmosphere model at high resolution over the tropical latitudes. UPWELLING in the ARABIAN SEA and INDIAN OCEAN WARMING TREND Indian Ocean North Pacific Ocean The dynamics leading to the spatial pattern of the Indian Ocean warming trend are investigated. In particular we focus on the dynamical controls of the Arabian upwelling and biological productivity, to isolate the competing effects associated with changes in monsoonal upwelling winds, upper ocean stratification and thermocline depth. Canada Sea Surface Temperature – EOF 1 Arabian Sea Warming Trend over the Indian Ocean Upwelling Winds vs. detrended SST Biological Modeling with S. Vieira and P. Webster (GaTech), A. Bracco (WHOI). NSF support. SpringSummer FallWinter 3 3 03 0 1.5 -125 -120 -115 38 36 34 32 38 36 34 32 Latitude N CalCOFI Model M1 MODELING BIOLOGICAL OBSERVATIONS The Ecosystem model simulations forced by a coastal ocean models provides the framework to test hypothesis on the relationship between physical environments and marine ecosystems. with M. Ohman et al. as part of NSF-LTER site project in the California Current 1950 1960 1970 1980 1990 2000 Temperature Stratification Pacific Decadal Oscillation Nyctiphanes simplex anomalies Doliolum denticulatium anomalies Cool Phase Salps 1950 1960 1970 1976 1990 2000 Latitude N Biomass (mg Cm -2 ) NONLINEAR TRANSITIONS in MARINE ECOSYSTEMS Chlorophyll-A Emanuele Di Lorenzo and Annalisa Bracco Ocean Modeling