state of the arctic report · state of the arctic report ... opportunity for recovery . arctic...
TRANSCRIPT
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State of the Arctic ReportConsensus review by team of 26 international scientists26 international scientistsFocus on physical components
Atmosphere• Atmosphere• Ocean• Sea Ice
L d• LandHighlights Arctic data from 2000 to 2005Updates some of the records from the Arctic Climate Impact Assessment
http://www.pmel.noaa.gov/pubs/PDF/rich2952/rich2952.pdf
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State of Arctic ReportState of Arctic ReportRules of Engagement
• Report of observations• Relatively short: 20-25 pages
– Few selected observations for each component
• Relatively high confidenceReasonably accessible: Frequent updates• Reasonably accessible: Frequent updates
• Limited interpretation and editorializing
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State of the Arctic Report SSummary
• Taken collectively, observations show convincing evidence of sustained period of warmingevidence of sustained period of warming temperature in Arctic– Continued reduction in sea ice extent, observed at both the
winter maximum and summer minimumwinter maximum and summer minimum– Widespread changes in Arctic vegetation
• Warming trend tempered somewhat by shifts in the ti l tt f l d t t dspatial patterns of land temperatures and ocean
salinity and temperature– Moving towards climatological norms
• Spatial extent of recent changes in air temperature, sea ice and vegetation is greater than observed in the 20th centuryy
• Still large region to region and multiyear shifts in the Arctic climate
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State of Arctic ReportUpdate
Arctic Report Card• Annual update • Expansion of content• Continue to present clear, reliable and concise
information on recent environmental conditions in the Arctic, relative to historical time series records
• Material prepared by an international team of scientists and peer-reviewedscientists and peer reviewed
• Web-based format to facilitate future timely updates of the content
• Arctic Report Card 2007 scheduled for posting in Fall 2007: NOAA Arctic Theme Page
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ARCTIC SEA ICE COVERARCTIC SEA ICE COVERSeptember 2005
NASA
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SEA ICE EXTENTMarch 2006
MaximumSeptember 2006
Minimum MaximumMinimum
NEW RECORD!RECORD!
2006: At or near record minimum in summer and winter
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SEA ICE EXTENTSEA ICE EXTENT
Max. Extent: 2.5% per decadeMin. Extent: 8.9% per decade
1979-2006: Decreasing trend
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The Road (Route) Ahead?( )
UCAR H ll d t l 2006WHYUCAR, Holland et al., 2006WHY
Ice-free summers in foreseeable future
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SEA ICE COVERaka ‘The Great Integrator’aka ‘The Great Integrator’
THERMODYNAMICSIce grow melt and decay
Solar radiation
Ice grow, melt and decay
DYNAMICSIce motion
Wind stress
Ice motion
Ocean heat flux
Wind stress
Ocean stress
Reflects impact of atmospheric and oceanic forcing
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Arctic Oscillation (AO)Two Dominant RegimesTwo Dominant Regimes
Negative AO Positive AOg
ICEGAINS
ICELOSESGAINS LOSES
• Colder winter temperatures • Warmer winter temperaturesp• Strong Beaufort Gyre increases residence time for ice
p• Transpolar Drift Stream
sweeps ice out of Arctic Ocean
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Atmospheric Oscillation (AO)
Strong positive pattern dominated from 1989 – 1996Favors loss of sea ice
More neutral pattern from 2000 - 2006Opportunity for recovery
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Arctic Surface Air Temperature1900- 2006
Arctic-wide, annual averaged SAT anomalies (60 – 90°N) over land
1980-present: Warming trend
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Warming: Arctic trend consistent with global trend
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SURFACE TEMPERATURE• March-May temperature anomaly composites • Relative to a 1968-1996 base period
Despite shift, positive (warm) anomaliesremain over the entire Arctic
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OCEANSoutheastern Bering Sea continental shelf mooring
TemperatureSoutheastern Bering Sea continental shelf mooring
☺☺
2006: Significant cooling compared to previous 6-years
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OCEANNorth Pole RegionSalinity Temperature☺
Anomalies relative to EWG
OCEAN2000
Temperature & Salinity☺
Anomalies relative to EWG climatology (1950-1980s)
2000-2005: Relaxation to near pre-1990 climatology
Morison et al., 2006a
2005
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2007 Arctic Report Card2007 Arctic Report CardSea Ice Cover
• Arctic Oscillation
• Surface TemperatureWhy continued decrease in extent?• Ocean Temperature
y
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SEA ICE AGECirculation pattern Thickness contours
5
70˚N
75˚N
34
6
7
80˚N
85˚N
90˚N
1
2
Ice Edge
Greenland0
Older ice tends to be thicker, more robustFrom Bourke and Garrett, 1987
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SEA ICE AGE(Aft Ri d W ll 2004)
Russia
Sep 1987, Summer
(After Rigor and Wallace, 2004)
Ala
Older, thicker ice
Canada
ska
OW 0 1 2 3 4 5 6 8 10+ YearsAge:
Sep 2006
Younger, thinner ice
OW 0 1 2 3 4 5 6 8 10+ YearsAge:
1988-1990: Precipitous decrease in older ice
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Atmospheric Oscillation (AO)Atmospheric Oscillation (AO)
Strong positive pattern dominated from 1989 1996Strong positive pattern dominated from 1989 – 1996Favors loss of sea ice
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SEA ICE AGEOlder, thicker ice
5.5
6.0
ModeledQuikScat6 k
m2 )
4.0
4.5
5.0QuikScat
area
(106
2 5
3.0
3.5
enni
al ic
e
1950 1960 1970 1980 1990 2000 20102.5
Year
Per
Rigor & Nghiem
Continued decrease in volume of older ice
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The Arctic Sea Ice Cover
ALBEDOALBEDO
From the Living Earth
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Albedo = reflected sunlightincoming sunlightg g
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ALBEDOALBEDOVaries between…
&&
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Arctic Ocean
Sea Ice
OceanOcean
Largest and smallest albedos on earth
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MeltingMeltingM ltigMeltingMelting
++ ++Positive
FeedbackAbsorbedsunlight Lower albedo
Absorbedsunlight Lower albedo
Absorbedsunlight Lower albedo
Feedback Cycle
++
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25-year trend of annual solar heat input to oceanIce-Albedo Feedback
Increasing solar heat input in 85% of area
September 2006
Units are percent per yearp p yPerovich et al.
Enhances ice edge retreat
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Confluence of Events…Confluence of Events…
Ab b d
Melting
++
+ Absorbedsunlight Lower albedo
++
Strong & PersistentPositive AO
(Loss of old sea ice)
Rising GlobalTemperature Strong Positive
Feedback Cycle
Sea ice cover susceptible to lossSea ice cover susceptible to loss
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State of the Arctic Sea Ice CoverState of the Arctic Sea Ice Cover
SummarySummary• System under stress
General warming global temperatures- General warming global temperatures- Strong positive feedback cycle: Ice
albedo- Precipitous drop in older, thicker ice
• Destabilization?- Rebound vs. State Transition
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International Polar YearInternational Polar Year
http://www ipy org/http://www.ipy.org/
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SEA ICE: Summer minimum extent
Reduction from 1982 to 2005
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SEA ICE: Summer minimum extentReduction from 1982 to 2005Reduction from 1982 to 2005
22 states – almost entire US east of the Mississippi