mir ozone issues horizontal (ste) and vertical transport (long life time in utls) photochemical...
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MIR OZONE
ISSUES
Horizontal (STE) and vertical transport (long life time in UTLS)
Photochemical production by precursors (biomass burning, lightning,..) ?
Origin of wave number one distribution in tropospheric column ?
Ozone
200154 profiles
200311 profiles
Hurricane
40
35
30
25
20
15
10
5543210
Concentration (x1012 mol/cm3)
No cloudsO3
MorningEvening
40
35
30
25
20
15
10
5543210
Concentration (x1012 mol/cm3)
No cloudsO3
Morning Evening
A little less in LS and UT than in 2001-2003 (lower lat, QBO, later season)
Very small variability in LS, larger in UT and TTL, similar to 2001-2003
SAOZ-MIR 2004
Ozone partial column 7-32 km
Most of Wave number one in TTO due to UT and TTL and
not to Lower troposphere (biomass burning)
350 300 250 200 150 100 50 0
25
20
15
10
5
0
40 30
30
20
5 5
-10
-10
-20
-50 -50
-20
∆Z 360-340 K
O3 DEVIATION (%)
Walker Circulation (Newel 1979)
Ozone at 20°S MIR SAOZ March 2001
% deviation from zonal mean
Minima in TTL over convective areas, particularly maritime (O3 destruction at surface level over Ocean), Maxima over subsident regions (meridional horizontal transport)
Ozone distribution mainly controlled by transport (quasi-horizontalfrom mid-latitude and vertical by convection
Very similar ideas:Max in UT over subsident oceanic areasMinimum over convection, lowest over maritime convection
March 2004
Ozone partial column 7-32 km
Most of Wave number one in TTO due to UT and TTL and
not to Lower troposphere (biomass burning)
43210
Abs. variability ((e11 mol / cm3)
30
25
20
15
10
5
0543210
Number Dens (e12 mol/cm3)
100806040200
% Variability
Ozone variability along latitude circle in 2001
± 3% above 20 km± 15% in TTL above TT± 35% in UT
Removal of H. Transport (PV correlation)Vert. Transport (340-370 K thickness)
Predominantly H. transport Contrib. of convection up to 19km Others in UT and TTL (chemistry, errors) <7%
Tropopause
Top TTL
25
20
15
10
Altitude (km)
50403020100
Variability (%)
Observed
Horiz.transp. removed
Transp. removed
Difference between maritime and continental convection ?
MIR-SAOZ Water vapour
Measurements : 3 Wavelength ranges: 590 nm, 760 nm and 940 nm
GOALWhich process is controlling the dehydration of stratospheric air ?
Convective dehydration (air already dehydrated in convective clouds) ?OrCold-trap dehydration (dehydration within slow ascending air in coldest TTL through fast horizontal transport) ?
SAOZ- MIR H2O compared to SDLA, HALOE and ECMWF
Cold Point
Tropopause
5
10
15
20
25A
ltitu
de (
km)
Water Vapour MR ppm1 10 102 103 104
SDLA2, SDLA4, ECMWF, MIR, HALOE, GOMOS
GOMOS
Cold Point
E. Pacific Atlantic Indian
Water Vapour Zonal distribution
Minima at cold point level over subsident maritime areas (STE ?)
Maxima over deepest convective areas : Africa, S. America and SPCZ
Temperature derived from O2 density (preliminary, 5K bias)
Cold Point
Maximum H2O at coldest cold point level over convective areas !
Extinction < 1e-2 km-1 = thin cirrus
MIR-SAOZ
2004
Tropopause
Cold Point
SPCZ S. America Africa Hurricane
Atmospheric Extinction
Opaque clouds barely at lapse rate tropopause Thin cirrus predominantly over convective areas
150100500-50-100-150
Longitude
25
20
15
10
5
0
0.008
0.008
0.008 0.006
0.006
0.006
0.006
0.006
0.006 0.004
0.002
CLOUDS
DJF average Water vapour (ppm) at 100 hPa.
Left HALOE, right MOZART
3.8
3.6 3.4 3.8
33 3
Max over convective areas : Africa, S. America and SPCZ
Min over subsident oceanic areas
East QBO
West QBO
MLS
100 hPa
Black contour: UKMO temp <193.5
White: OLR <220W/m2
MLS
83 hPa
UARS MLS
100 hPa
83 hPa
ECMWF / REPROBUS Feb-Mar 04
Read et al. 2004
Preliminary conclusions
Water vapour maxima at cold point level over deepest convective areas, coldest cold point temp and max cirrus.
Minimum over subsident maritime areas (STE ?)
Fully consistent with HALOE seasonal average and MLS 1992/93 (same QBO phase)
Lesser agreement with ECMWF
New GOMOS H2O available (still preliminary)
Further work
Improved comparisons with other Hibiscus observations
Correlation with H and V transport indices
Comparisons to global scale simulations