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SAOZ NO x and Lightning J. P. Pommereau and F. Goutail. Ground-based SAOZ in Bauru since 1995 Short duration small balloon flights MIR long duration flights Modelling Further work.

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slide1

SAOZ NOx and Lightning

J. P. Pommereau and F. Goutail

Ground-based SAOZ in Bauru since 1995

Short duration small balloon flights

MIR long duration flights

Modelling

Further work

slide2
SAOZ Spectrometer at IPMet in Bauru since 1995Network for Detection of Stratospheric Change (NDSC) complementary station
slide4

NO2 evening columns above BAURU

  • Most important parameters
    • Season
    • Small influence ENSO and QBO (10 hPa)
    • No influence of Solar flux and Kp
    • Average Residual <0.001%, max 4%
slide5

NO2 evening columns above BAURU

95 96 97 98 99 00 01 02 03

slide9

2001

2003

slide10

NOy mid-lat ?

Local prod by blue-jets ?

MIR-SAOZ 2004

Lightning ?

(larger NO2 in the morning ?)

slide11

NO2 MIR-SAOZ 2001 20°S

% deviation from zonal mean

Correlated with O3 STE ?

?

Maximum in UT over continental convection

Minimum over Maritime areas

slide12

MOZART Modelled lightning and NOx production at the Equator JFM (NOx production over continental convection only)

slide13

Lightning Imaging Sensor onboard TRMM (DJF)

Continental and Maritime convection of different nature

slide14

NO2 MIR-SAOZ 2003 20°S

% deviation from zonal mean

?

Correlated with O3 STE ?

slide15

MIR-SAOZ 2003

High lightning activity at launch

slide16

NOy mid-lat ?

Local prod by blue-jets ?

MIR-SAOZ 2004

Lightning ?

(larger NO2 in the morning ?)

slide18

2004

20 km max

but at diff loc

?

As 2001 and 2003

UT / TTL

Low over maritime convection (as 2001)

High over Africa (as 2001)

Limited over South America (less than 2001)

slide19

12-14 March

MIR over Africa

High Lightning activity

slide20

20-23 March

MIR over Amazonia

Low Lightning activity

slide23

Summary NO2 Sources (I)

Local production vs transport

Removal of H transport by PV correlation

Production by lightning in UT and TTL

Maximum column onn strong lightning days

Maximum up to 200 ppt at 15 km , 100 ppt at 12 km highly correlated to lightning activity over continental convective areas

Minimum 10-20 ppt over maritime convective areas

Further work

MIR Correlation with LIS flashes during 5 days prior to MIR overpass How much NOx produced by lightning: comparison to model simulations, ajustment of parametrisation. LMDz / TOMCAT modelling in progress over Bauru as well as at MIR location

slide24

Summary NO2 Sources (2)

Max NO2 0.2-0.3 ppb at 20-22 km at longitude depending on year

STE ? Local production in LS by blue-jetsfollowed by QBO dependent transport ?

Further work

Characterisation: Source in Reprobus and Mimosa Chem ?

Mechanism: MIPLASMO box trajectory ?