Ozonesoundings at Ozonesoundings at Belgrano II StationBelgrano II Station

Margarita Yela and Conchita Parrondo

Área de Investigación e Instrumentación Atmosférica

INTA

Belgrano II location

Confin Coast - North of Coast Land

•77°52'29"S, 34°37'37"W

•50 m above sea level

•Solid rock surface

•120 km from the Antarctic coastline

•Halley (400 km) nearest station

•Ushuaia (2500 km) nearest port

• The ozonesonde activity at Belgrano II was started in May, 1999 as part of long term program to study destruction of Antarctic ozone layer. This program is funded by INTA, Spanish Antarctic Program and Dirección Nacional del Antártico (Argentina).

• The activity at the station has continued since then with two soundings/month in summer and autumn and more frequently during winter and spring.

Instrumentation

Receiver: Marwin II Digicora 15

Radiosondes: RS80-15GE with GPS system

O3 sensor: ECC 6A

Väisala Metgraph software: Version 5.14A

Balloon: TOTEX 1200TX

Antenna

Laboratory

2005 results2005 results

170180190200210220230240

0

2x1015

4x1015

6x1015

8x1015

1x1016

050

100150200250300350400450

024681012141618202224

T 475K T 550 K

ICENAT

Ozo

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tal (

D.U

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ora

s de lu

z a 20

 kmTem

pera

tura

 (K

)N

O2 tot

al c

olum

 (m

olec/

cm2)

 

 NO2 am

 NO2 pm

 

Vort

icic

idad

Pot

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al

(x10

6 k

m2 k

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 DOAS instrument Ozonosondas

Belgrano 2005

 

 horas de luz

­80

­60

­40

­20

0

dic.nov.octubresept.agostojuliojuniomayoabrilmarzofebreroenero

  

 

 

PV(475 K)

2005 Ozonesonde results

Mean altitude reached

Total sondes=38

Mean altitude reached: 28.6±4.1 km

95% of soundings reaching >20 km

14

16

18

20

22

24

26

28

30

32

34

36

0 2 4 6 8 10

 

 

Number of  sondes

Alti

tude k

m)

  number of sondes height mean= 28.6 kmσ =4.1 km

2005 Ozone behaviour at BelgranoThe seasonal evolution of ozone at Belgrano is characterize by a slowly ozone increase in the lower stratosphere due to dynamical processes from summer until ozone destruction by chemical processes start at the end of July or beginning of August. The destruction occurs in the region between 12 and 20 km leading to a nearly complete O3 removal by the first week of October. From mid October ozone starts to increase from the upper levels to lower levels. The arrows at the base indicate the time of each sounding.

2005 sondes

PV at Belgrano from 1995PV at Belgrano from 1995

­100

­80

­60

­40

­20

0

  

 

 

  PV (475 K)

20052004200320022001200019991998199719961995

Belgrano 

PV

 ( 1

06  (x1

06    k

m2 k

g­1 s

­1) 

Ozonesoundings at Belgrano II station

Time-altitude cross-section of the ozone measured by ECC ozonesondes at Belgrano station from 1999-2005. The arrows at the base indicate the time of each sounding.