Transcript OceanModeling - Emanuele Di Lorenzo

Ocean
Pacific
Modeling
Emanuele Di Lorenzo
North
Ocean
WARMING of the CALIFORNIA CURRENT
An eddy resolving models of the California Current is combined
with 52 year long in situ observations of Temperature and Salinity
from the California Cooperative Fisheries Investigation, to elucidate
the dynamics of upper ocean warming and their effect on ocean
biology.
North-East Pacific - Mean Surface Temperature
Model Domain
California
Current
INDO-PACIFIC
CLIMATE CHANGE and EDDIES in the GULF of
ALASKA
THEMROCLINE
Indian Ocean
DYNAMICS,
Coupled
Ocean-Atmosphere
Modeling Approach
A coupled ocean-atmosphere model is used to investigate the dynamics of the indo-pacific thermocline
on decadal and ENSO timescale. In particular we investigate the relationship between upwelling and the
Indian Ocean dipole mode.
Global Warming may lead to increase precipitation over Alaska
and Canada. We investigate the effects of enhanced coastal
buoyancy fluxes on the generation/dynamics of large scale coastal
eddy
dynamics and on large
scale
mixing of nutrients
in the
Gulf of
Sea
Surface
Height
[m]
1998/02/13
Alaska.
Canada
m
ENSO February 1998
SSH anomaly
INDO-PAC
India China
30° N
USA
Section A
0°
C
1998/03/05
CalCOFI In-Situ
Observations
30° S
Sitka Eddy
1950 – 2000
(high density sampling domain)
Australia
Haida Eddies
Observed Temperature Anomalies
1998/03/25
110° E
-4
-2
160° E
0
cm
150° W
2
100° W
4
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.
with V. Combes (GaTech). NSF support.
Warming Trend
Observed Salinity Anomalies
60° E
Biological
Modeling
SPATIAL/TEMPORAL
CHLOROPHYLL-A
VARIABILITY
Arabian Sea
OF
Upwelling Winds vs. detrended SSTWarming Trend over the Indian Ocean
Ecosystem models forced by coastal ocean models are used to
Spring
OBSERVATIONS
the variability
of CHL-A andMODEL
its response to climate
change.
2
-100
1
-200
0
3
-100
-200
0
3
Depth m
2
-100
1
-200
Depth m
Winter
with N. Schneider (UH), A. Miller (Scripps), J.
McWilliams (UCLA). NSF, NASA support.
Southern California Coast
1
Fall
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.
with S. Vieira and P. Webster (GaTech), A. Bracco (WHOI). NSF
support.
2
Latitude N
Geostrophic Along-shore Currents
Depth m
Summer
M1
0
3
2
-100
1
-200
-124 -122 -120
Longitude W
-124 -122 -120
Longitude W
Spring
38
Summer
Model
CalCOFI
36
3
34
Fall
38
Winter
36
3
1.5
34
32
M1
0
-125
-120
-115 -125
MODELING BIOLOGICAL
OBSERVATIONS
1.5 The Ecosystem model forced by coastal
32
Latitude N
Low Frequency
Salinity variations
Depth m
3
-120
0
-115
are compared to the CalCOFI
observations and used to diagnose the
relationship between physical costal
dynamics and biological productivity.
part of NSF-LTER
site project in the
California Current