1 Global changes of the hydrological cycle and ocean renewal inferred from ocean salinity,...
Transcript of 1 Global changes of the hydrological cycle and ocean renewal inferred from ocean salinity,...
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IASOS Seminar Series 1
Global changes of the hydrological cycle and ocean renewal inferred from ocean
salinity, temperature and oxygen data
Nathan Bindoff, Kieran Helm and John ChurchCAWCR, ACECRC, IASOS, CSIRO
University of Tasmania
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IPCC AR4 Synthesis
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Data Distributions
Database•WOCE (Red)•Profiles (Blue)•ARGO (Green)
Methods•Interpolated WOCE•Used adaptive•Blue water
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Water Mass change
Salinity Minimum
Shallow salinity maximum
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displacementof density surfaces
Salinity change on density surface
Zonally averaged changes
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Apparent surface fluxes
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Apparent surface fluxes
P-E
Heat
Volume
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Climate models, essential to hypothesis testing
Observations 1980-2000
Mean Model 1980-2000
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Comparison with models
Estimated P-E
IPCC models1970-2000
+16±6% in S. Ocean+ 7±4% in N.H- 3±2% in S.T. gyres
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Excess P-E near Antarctica?Antarctica is loosing mass• 0.14 ± 0.41 mm yr-1 SLE, 1961-2003• 0.21 ± 0.35 mm yr-1 SLE, 1991-2003• ~0.4 ± 0.35 mm yr-1 SLE,2002-2007Wahr and Velicogna 2007.
Increasing evidence of melt• Jacobs 2001, Rintoul 2006, • Aoki et al 2005
Melt of ice shelves?• <5% over 30 to get extra 50 mm.yr-1
• no sea-level rise• negligible gravity signal• consistent with ocean melt• 700 years at ~50mm.yr-1
Gravity
Altimetry
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Is ocean renewal changing?•Decrease surf. Buoyancy•Changingstratification•Carbon cycle
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Oxygen change from displacement of density surface
Oxygen change on density surface
Zonal oxygen changes
•Global Scale•Not heave•1970 to 1990’s
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Apparent surface fluxes
Oxygen flux
Heat flux
•Decrease 1.8+-0.9 mol.l-1•Equivalent to ~1% decrease •Equivalent flux
•0.6+-0.3 1014 mol.yr-1
•0.2 to 0.7 1014 mol.yr-1 in the literature (eg Keeling and Garcia 2002)
Implications:•Reduce O2 exchange with atmosphere•Reduced water mass ventilation in the subduction
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Winds or buoyancy?
Sann =1
Tyr ρ g ∫ Bnet
h Qb
dt
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High latitudes processes and symmetry
•High Latitudes large impact on storage changes•Zonal averages similar in both hemispheres
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Conclusions•Changing freshwater fluxes
•Plausibly attributable climate change•Evidence of increased melt of Antarctic ice shelves•Acceleration of hydrological cycle
•Striking global scale oxygen changes•Evidenced for reduced ocean exchange•Weakening of the global overturning circulation?
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Interpretation
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Global Oxygen Changes
•Decrease 1.8+-0.9 mol.l-1•Equivalent to ~1% decrease •Equivalent flux
•0.6+-0.3 1014 mol.yr-1
•0.2 to 0.7 1014 mol.yr-1
In the literature (eg Keeling and Garcia 2002)
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HadCM3 1990's- 1960's
More evidence
Aoki et al, 2005
Banks and Bindoff, 2003
1960’s to 1990’s30E to 180
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Climate Differences
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Winds or buoyancy?
Sann =1
Tyr ρ g ∫ Bnet
h Qb
dt
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Consequence of ocean acidity and renewal
change• Impacts on organisms that have calcareous shells (in particular aragonite)
• Coral reefs• Changes in upwelling
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24O’Farrell + Budd, in prep
Warming of the Southern Ocean
Observations (Gille) Model
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Rate of ice volume change:
All Antarctica: -149 km3/yr
West Antarctica: -115 km3/yr
East Antarctica: -23 km3/yr
East/West dividing line
Wahr and Velicogna, 2007
Antarctic Ice Mass Loss from Antarctic Ice Mass Loss from GRACEGRACE
Antarctic Ice Mass Loss from Antarctic Ice Mass Loss from GRACEGRACE
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Data Distribution: profile data
Oxygen
Temperatureand salinity
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Changes on neutral surfaces
Salinity
Pot
. T
empe
ratu
re (
°C)
new
th
erm
oclin
e
old
ther
moc
line
ρ2
ρ1
Pure warming
new
th
erm
oclin
e
old
ther
moc
line
ρ2
ρ1
Pure freshening
Salinity
Pot
. T
empe
ratu
re (
°C)
(See: Bindoff & McDougall, 1994, 2000)
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Comparison with HADCM3
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Comparison with CSIRO Mk3 Model
2090’s minus 1950’s
Downes et al, inprep.
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HadCM3 1990's- 1960's
More evidence
Aoki et al, 2005
Banks and Bindoff, 2003
1960’s to 1990’s30E to 180
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Decadal variability
Mixed layer depths and section lines
•Bryden et al., 2003, McDonagh et al. 2005
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Observations
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Zonally averaged differences on density surfaces
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Time series of zonal averages at sigmat=26.7
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Extremes of modelled mixed layer development
Murray et al. 2007Message: the water mass variations related
Mixed layer thickness changes
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Climate Differences
Mawson Harbour, Antarctica
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Data and method
1. Convert Hydrobase2 from pressure to density levels
2. Optimally interpolate 800,000 pre-1988 profiles to 40,000 post-1988 locations
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Data and method
1. Convert Hydrobase2 from pressure to density levels
2. Optimally interpolate 800,000 pre-1988 profiles to 40,000 post-1988 locations
3. Directly compare 1970 with the early 1990s using a ‘snapshot’ approach
Helm et al., inprep
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Regional T-S changes
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Salinity increases in thermocline water on isopycnals (γn=24.8)
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Freshening of intermediate water on isopycnals (γn=27.0)
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Zonal changes on density surfaces
Cooler/Fresher Warmer/Saltier
CDW
Mode
Salinification sub-tropics
IW
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Deeping of isopynals in mid to high latitudes
Shoalling Deepening
CDW
Mode
Salinification sub-tropics
IW
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Global oxygen decreases
CDW
Mode
Salinification sub-tropics
IW
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Key findings 1970’s to 1990’s
• On neutral density surfaces:• Globally coherent
temperature/salinity changes• Warming/increasing salinity of upper
thermocline waters• Cooling/freshening of mode and
intermediate waters• Oxygen decrease in upper
thermocline, mode, intermediate waters and CDW
• Largest changes occurred in the upper 1500m
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Summary
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ProcessesSubduction Changes
•CSIRO Mk3
•2090’s minus 1950’s
•Diagnosed using MNW
•Model diagnostics
AAIW
CDW
SAMW
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Buoyancy Changes
•CSIRO Mk3
•2090’s minus
1950’s
•Diagnosed using
MNW
•Model diagnostics
AAIW
CDW
SAMWCW
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Schematic of changes…CSIRO MK3 model
2090’s to 1950’s
Process that matter:
•CW Increased
subduction,decreased
buoyancy
•SAMW Decreased
subduction, Decreased HF
and FF
•AAIW Decreased
subduction, HF and FF
•CDW Decreased
entrainment, increased
HF,FF
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50Barnett et al. Science 2005
Parallel Climate Model
ObservationsACC Simulations
Detection
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Implications of Climate Differences (1)
Patterns are global, coherent, consistent with earlier work.
Salinity changes suggest increased “evapouration” in sub-tropics,
increased “precipitation” at high latitudes,
and increased strength in hydrological cycle.
CDW warmed and lower in oxygenLower renewal rates, decreased ventilation
(even though winds are stronger)
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Climate Differences (Conclusions) (2)
AABW now fresher (Aoki et al, 2005)
Observations are qualitatively same as climate change mode in CSIRO Mk3 model (and HadCM3)
Natural variability, aliasing cannot be ignored
Heat content in 2004 and 2005
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Thanks..
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Comparison with HADCM3 1960-1990's
HadCM3 1990's- 1960's
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Control HadCM3
Anthropogenicsimulation HadCM3 95%
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Science Questions
• Global heat content of the oceans and its variations
• Global observations of oxygen change in the oceans
• Global changes in sea-level and its spatial variations
• Global observations of the cryosphere and decadal variations
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Heat Content
Gregory et al 2004
Decadal variations
Question: why do models not simulate as much variabilityas seen in observations.
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Oxygen Content Change
Oxygen change, WOCE- historical, 27.8 ns
Temperature change 27.8ns
Oxygen content changingon global scales- implies ocean processes are Important, is physical or Biological?
Helm et al, in prep
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Sea-level and its spatial variations
IPCC models do not agree on spatial patterns of steric sea-level change, but do agree on SST.
Downes et al, in prep
Reasons: •Sea level is integrative•Subduction and ventilation not well simulated
Results from TAR for sea-level.
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Cryosphere and decadal variations?
Tide-gauges
Steric Sea-level
Difference
Suggest that there is decadal variations in cryosphericcomponent to global sea-level.
Upto 78% of observed sea-level rise is from ice sheets and glaciers over the last 50 years
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Zonal averages of ocean state
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Shifting outcropping zones
= time1
= time2
ρ1(t1)
ρ2(t1)
ρ2(t2)
ρ1(t2)
ρ1(t1)
Shift density layer south
SOUTH NORTH
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Global T-S profile
See Bindoff & McDougall (1994,2000)
Cooling and freshening on isopycnals may be able to be explained by ‘pure warming’
Salinity
Pot
. Tem
pera
ture
(°C
)
old
ther
moc
line
ρ2
ρ1
Pure warming
new
th
erm
oclin
e
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Revolution in ocean
observationsScientific questions:• Do we understand the heat
content record (and sea-level)?
• Do we understand the changes in ocean salinity?
• Is ocean carbon cycle changing?
• Is ocean ventilation changing?
• Can we detect the changes in the SO overturning cells.
• Assess ocean models (and GCM’s)
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Solutions
• ACCESS evaluations– Freshening of bottom water,– Change in precipitation, carbon cycle,
heat content– Improve spatial distributions of heat,
carbon
• Detection and attribution– Natural variations or man induced?
• Initialisation
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Three underlying issues for ocean observations and models
1. Sustained observations (big risks)- operational capability (eg IMOS)- Insitu programs (ARGO, SOO, etc)
2. Timely data and model access– to ensure timely access to data so that
all may derive benefit (repository)– range of model outputs (eg ACCESS,
IPCC/PCMDI, re-analyses like BlueLINK, ECCO, SODA)
3. Need specialist Earth System Science Facility
HPC, Storage, technical support for ACCESS, and managed by/on behalf of climate scientists
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Climate Change Initiative
• Enhanced and sustained climate measurements ($300 million over 5 years)– Ocean climate data, new ship(s),
additional support ($200 million)– Terrestrial climate networks ($100
million)
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Climate Change Initiative
• An e-Research or Information Systems for Earth Systems Science ($30 million, 5 years)
• Specialist Earth Systems Science Facility (Service support and 100 Terraflops and data, ~$40million)
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Climate Change Initiative
• Climate Challenge Projects ($40million)– Australia 30 year initialisation (include– Australia Re-analysis project– Australian Ocean re-analysis project
(including Southern Ocean and Antarctica)– Australian Climate Risk Managements
• New collaborative arrangements that include researchers and government
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Climate Change Initiative
• Mitigation and validation service for Australian Carbon Trading Bank
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Climate Change Initiative• Enhanced and sustained climate
measurements ($300 million over 5 years)
• e-Research or Information Systems for Earth Systems Science ($30 million, 5 years)
• Specialist Earth Systems Science Facility (Service support and 100 Terraflops and data, ~$40million, 5 years)
• Climate Challenge Projects ($30 million)• Mitigation and validation service for
Australian Carbon Trading Bank ($10 million)
• Budget ($310million)
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91 92 93 94 95 96 97 98 99 00 01 02 03 04 05
Observational Risk – potential failures
RA/ERS-1
GFO
05 06 07 08 09 10 11 12 13 14 15 16 17 18 19
On going mission
SARALEnvisat
Approved mission GMES mission beginning development
Jason-3
Pending Jason follow-on
66°-inclination climate reference orbit
High-inclination complementary orbit
Jason-1
Sentinel 3 – 2-satellite series
Jason-2
Cryosat-2
NASA mission pending approval
SWOT
HY-2B HY-2C HY-2DHY-2A
Stan Wilson