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38. 38. 36. 36. 34. 34. 32. 32. Underwater Sensors. ENSO February 1998 SSH anomaly. INDO-PAC. China. Networks Workshop. India. 30 ° N. 0 °. 30 ° S. Australia. 150 ° W. 60 ° E. 110 ° E. 160 ° E. 100 ° W. -4. -2. 0. 2. 4. cm. Ocean Modeling.

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Presentation Transcript
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Underwater Sensors

ENSO February 1998 SSH anomaly

INDO-PAC

China

Networks Workshop

India

30° N

30° S

Australia

150° W

60° E

110° E

160° E

100° W

-4

-2

0

2

4

cm

Ocean Modeling

Emanuele Di Lorenzo and Annalisa Bracco

Indian Ocean

North Pacific Ocean

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.

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.

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.

Sea Surface Height [m]

North-East Pacific - Mean Surface Temperature

1998/02/13

Canada

Model Domain

m

California

Current

USA

Section A

C

1998/03/05

CalCOFIIn-Situ

Observations

1950 – 2000

(high density sampling domain)

Sitka Eddy

Haida Eddies

Observed Temperature Anomalies

1998/03/25

UPWELLING in the ARABIAN SEA and INDIAN OCEAN WARMING TREND

Sea Surface Temperature – EOF 1

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.

Arabian Sea

with V. Combes (GaTech). NSF support.

Warming Trend

Biological Modeling

Observed Salinity Anomalies

NONLINEAR TRANSITIONS in MARINE ECOSYSTEMS

Warming Trend over the Indian Ocean

Upwelling Winds vs. detrended SST

Temperature Stratification

1950 1960 1970 1980 1990 2000

Low Frequency

Salinity variations

Pacific Decadal Oscillation

Geostrophic Along-shore Currents

with S. Vieira and P. Webster (GaTech), A. Bracco (WHOI). NSF support.

1950 1960 1970 1980 1990 2000

Nyctiphanes simplex

anomalies

Southern California Coast

3

0

Biomass (mg Cm-2)

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.

Spring

Summer

Model

1950 1960 1970 1980 1990 2000

CalCOFI

Latitude N

1.5

Doliolum denticulatium

anomalies

Chlorophyll-A

3

Fall

Winter

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.

1950 1960 1970 1980 1990 2000

Cool Phase Salps

1.5

Latitude N

with M. Ohman et al. as part of NSF-LTER site project in the California Current

M1

-125 -120 -115

-125 -120 -115

1950 1960 1970 1976 1990 2000