measuring the antarctic ozone hole with the new ozone mapping and profiler suite (omps) natalya...
TRANSCRIPT
Measuring the Antarctic Ozone Hole with the new Ozone Mapping
and Profiler Suite (OMPS)
Natalya Kramarova, Paul Newman, Eric Nash, PK Bhartia, Richard McPeters, Didier Rault, Colin Seftor, Gordon Labow
OMPS meeting, June 6, 2013
Objectives• Can OMPS reasonably represent the Antarctic
ozone hole?
• Do the metrics derived from OMPS match OMI and MLS?
• Is OMPS an improvement?
OMPS meeting, June 6, 2013
Outline:
I. Introduction
II. The Ozone Mapping and Profiler Suite (OMPS)
III. Validation of OMPS measurements
IV. OMPS ozone hole first results
V. Conclusions
OMPS meeting, June 6, 2013
OMPS NP vs OMPS LP
Coincidence criteria: +/-0.5 hour, +/-1° latitude, +/-4° longitude.
September –November 2012
III. Validation of OMPS measurements
OMPS meeting, June 6, 2013
Biases increase for higher latitudes
SBUV vs OMPS NPSeptember –November 2012
Coincidence criteria: +/-4 hour, +/-1° latitude, +/-5° longitude.
III. Validation of OMPS measurements
OMPS meeting, June 6, 2013
OMPS NP overestimates ozone compared to SBUV
OMPS LP vs Aura MLSSeptember –November 2012
Coincidence criteria: +/-1 hour, +/-1° latitude, +/-4° longitude.
III. Validation of OMPS measurements
OMPS meeting, June 6, 2013
OMPS LP and Aura MLS vs Neumayer Sonde (70.6S, 8W)September –November 2012, 36 balloon measurements
Coincidence criteria: 1000-km distance from the station (dist. weight. average); same day.
III. Validation of OMPS measurements
OMPS meeting, June 6, 2013
Aura MLS/OMPS LP vs Neumayer Sonde
III. Validation of OMPS measurements
OMPS meeting, June 6, 2013
OMPS LPAura MLS
SONDESONDE
OMPS TC vs OMPS NP57.5S 62.5S 67.5S 72.5S 77.5S
Bias, % -0.6 -0.1 -0.1 -0.5 -0.5
Std dev % 1.2 2.1 2.1 2.3 2.4
57.5S 62.5S 67.5S 72.5S 77.5S
Bias, % -0.9 -0.5 0.3 0.7 1
Std dev % 3.6 4.3 4.7 4.3 3.5
OMPS NP vs SBUV NOAA18
OMPS NP vs SBUV NOAA1957.5S 62.5S 67.5S 72.5S 77.5S
Bias, % -0.8 -0.7 -0.4 -0.2 -0.6
Std dev % 3.4 3.8 3.9 3.7 3.3
Total ozone column comparisons
III. Validation of OMPS measurements
OMPS meeting, June 6, 2013
•Biases < 1%• Standard deviation is 3-4%
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
Total ozone, October 2012
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
Total ozone, October 2012Low values generally found
inside ozone hole
Higher values found outside ozone hole everywhere
OMPS meeting, June 6, 2013
IV. OMPS ozone hole first results
Area of the Antarctic ozone hole based on TOMS and OMI measurements. Red bar shows an estimate from OMPS TC.
2012 Antarctic ozone hole was 2nd smallest observed in the last twenty-
three years — only the major warming 2002 ozone hole was smaller
OMPS compares quite well with OMI, but slightly smaller because of the high bias
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
Evolution of 2012
Antarctic ozone hole
“Normal” development up to mid-September
Area
Minimum
More rapid disappearance after mid-September
IV. OMPS ozone hole first resultsO
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Location of the ozone hole center for September,
October, and November
IV. OMPS ozone hole first resultsO
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Total ozone values following the ozone hole
IV. OMPS ozone hole first resultsO
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Ozone profile following the ozone hole’s center
IV. OMPS ozone hole first resultsO
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Strong depletion of ozone in the
14-24 km region
IV. OMPS ozone hole first resultsO
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Lowest total ozone value
reached about Oct. 1
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Lowest profile value reached about Oct. 11
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Strong build-up of ozone in the
middle stratosphere
leads to overall ozone increase
IV. OMPS ozone hole first resultsO
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Large ozone loss sharpens the vertical gradient. The gradient’s
altitude is related to the Cl levels. As Cl declines, the gradient should
move to lower altitudes.
IV. OMPS ozone hole first resultsO
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IV. OMPS ozone hole first resultsO
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IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
High ozone concentration in the lowermost stratosphere
Clear signs of ozone depletion in the upper layer
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
The 3 layers show depletions by mid-September
Deep ozone hole
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
Area of the hole decreases
Deep ozone hole
Total ozone min ~ 1 Oct.
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
Notable decrease of the hole area in middle and upper stratosphere
Min ozone at mid Oct
Signs of ozone recovery
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
Ozone hole splits
IV. OMPS ozone hole first results
OMPS meeting, June 6, 2013
• Ozone increasing in all 3 layers• Total ozone shows a rapid
increase by late-November
V. Conclusions (1)
• OMPS suite began routine operations in 2012. – OMPS is derived from the strong heritage of UV-Vis satellite
instruments that extend from the 1970s;– Will become the standard ozone monitoring instrument
aboard the US polar orbiting satellites. • OMPS performs quite reasonably.
– direct comparisons of OMPS TC to the OMI column observations show differences of <1%;
– comparisons of the ozone profiles obtained from OMPS LP and NP with the profiles from the Aura MLS, SBUV, and ozone sondes show good agreement (biases <5-8% and std dev <5-10%) in the vertical range 20-45 km;
– good agreements between OMPS TC and OMI on estimates of the average minimum ozone and ozone hole area.OMPS meeting, June 6, 2013
V. Conclusions (2)
• 2012 ozone hole – 2nd smallest since 1988 - weakest ozone hole was 2002 – driven
by the first observed major SSW observed in the SH;– Early development (Aug. to mid-Sep.) was normal – still plenty
of Cl and Br for ozone loss. In the lower stratosphere, large losses seen in the LP from early Sep. to about 11 Oct. Ozone near zero at 16 km altitude by Oct. 11. Lowest column seen about Oct.1. Very strong vertical gradient develops by early October;
– Extremely high values of ozone seen in upper stratosphere by Mid-October as ozone is advected over Antarctica;
– Ozone hole disappeared (late-Sep to Nov) quite rapidly in comparison to the ozone holes in the last 20-year period, because of the strong wave dynamics, faster warming during Austral spring, and stronger advection. OMPS meeting, June 6, 2013