Ozone Observations Analyses on Eastern IslandLa Serena, 22 Nov. 2004

Juan QuintanaDirección Meteorológica de Chile

juaquin@meteochile.cl

Presentation:Presentation:

• Introduction (Campaign 2003) Introduction (Campaign 2003)

• Typical ozone sounding at Eastern Typical ozone sounding at Eastern IslandIsland

• Relevant processes atmospheric Relevant processes atmospheric observedobserved

• ConclusionsConclusions

1

2

3

4

Anticiclonic Vorticity and Subsidence

Climatological Aspects on Eastern Island

Climatological Zonal Wind – Spring (Sep-Nov)

Ozone Soundings in Rapanui 1995-2001

Ozonosondes: Esatern IslandPeriod: 1995-2001

Pre

ssur

e Le

vel (

hPa)

70

100

150

200

250

300

400

500

700

850

925

1000

Standarized Index

43210-1-2

CP 1

CP 2

CP 3

1500m

Cluster groups 1, 2, 3 and 4

38 Soundings 15 Soundings 15 Soundings 6 Soundings

Pressu

re Lev

el (hP

a)

70

100

150

200

250

300

400

500

700

850

925

1000

mPa

109876543210

Pres

sure

Leve

l (hPa

)

70

100

150

200

250

300

400

500

700

850

925

1000

mPa

109876543210

Pres

sure

Leve

l (hPa

)

70

100

150

200

250

300

400

500

700

850

925

1000

mPa

109876543210

Pres

sure

Leve

l (hPa

)

70

100

150

200

250

300

400

500

700

850

925

1000

mPa

109876543210

Ozonosondes: Esatern IslandPeriod: 1995-2001

Launch Nº Date Time (UTC) T. Resolution (s) Max. Height (m)1 09Nov.2003 16:00 10 325482 10.Nov.2003 0:00 10 331803 10.Nov.2003 6:00 10 312494 10.Nov.2003 18:00 10 333135 11.Nov.2003 0:00 10 331166 11.Nov.2003 6:00 10 350617 12.Nov.2003 0:00 10 339218 12.Nov.2003 15:00 10 334619 13.Nov.2003 18:00 10 26615

LH=UTC-5H

Campaign 2003: Eastern Campaign 2003: Eastern IslandIsland

Conditions Surface Conditions Surface 08 to 13 Nov. 200308 to 13 Nov. 2003

Isla de Pascua

0

5

10

15

20

25

30

8 9 10 11 12 13 14Días

T° Máxima (°C) - T° Mínima (°C)- Precipitación (mm)

Tº Max.

Tº Min.

Eastern Island

Day 08 Day 10

Day 12

Day 09

Day 11 Day 13

Subtropical Jet Stream (m/s), 200 hPaSubtropical Jet Stream (m/s), 200 hPa

(m/s)

Zonal Wind (27°S-109°W)

Satelital Image GOES 10 (IR)

Sinoptic ConfigurationSinoptic Configuration08 to 13 Nov. 200308 to 13 Nov. 2003

Geopotencial Height 500 hPa

Day 08 Día 10

Día 12

Día 09

Día 11 Día 13

Source: NCEP/NCAR

Potencial Vorticity (PV)

0

5000

10000

15000

20000

25000

30000

35000

40000

0 2 4 6 8 10 12 14 16

(mPa)

(m)

09Nov_16UTC 10Nov_00UTC 10Nov_06UTC

10Nov_18UTC 11Nov_00UTC 11Nov_06UTC

12Nov_00UTC 12Nov_15UTC 13Nov_18UTC

Tropospheric Ozone Average (0-16 km)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

09N

ov_

16U

TC

10N

ov_

00U

TC

10N

ov_

06U

TC

10N

ov_

18U

TC

11N

ov_

00U

TC

11N

ov_

06U

TC

12N

ov_

00U

TC

12N

ov_

15U

TC

13N

ov_

18U

TC

(mP

a)

0

2000

4000

6000

8000

10000

12000

14000

16000

-20 0 20 40 60 (m/s)

(m)

Zonal 11Nov00UTC Merid.12Nov00UTC

Zonal 12Nov00UTC Merid. 12Nov00UTC

WestEast

North South

Wind: Zonal - Meridional

0

2000

4000

6000

8000

10000

12000

14000

16000

-80 -60 -40 -20 0 20 40(m/s)

(m)

Temp.11Nov00UTC Temp 12Nov00UTC

Temperature

(°C)

0

2000

4000

6000

8000

10000

12000

14000

16000

0 0.5 1 1.5 2 2.5 3 3.5

(mPa)

(m)

0

2000

4000

6000

8000

10000

12000

14000

16000

250 300 350 400 450 500 550

(K)

(m)

Tropospheric Ozone09-13 Nov 2003

Potencial Temperature09—13 Nov. 2003

100

110

120

130

140

150

160

170

180

190

200

8 9 10 11 12 13 14

Pre

ssur

e (h

Pa)

Reanalyses Model Observed

Eastern Island - Tropopause (hPa)

ConclusionsConclusions

• Maximun Ozone Tropospheric is observed during Maximun Ozone Tropospheric is observed during Spring in low troposphere and high troposphere on Spring in low troposphere and high troposphere on Eastern Island.Eastern Island.

• Extratropical cyclones, troughs and Subtropical Jet Extratropical cyclones, troughs and Subtropical Jet Stream Intense (>25m/s) favor significant Stream Intense (>25m/s) favor significant Stratosphere-troposphere exchange (STE).Stratosphere-troposphere exchange (STE).

• Marine Boundary Layer (MBL) seems to play a role Marine Boundary Layer (MBL) seems to play a role important in tropospheric ozone maximum.important in tropospheric ozone maximum.