STRATOSPHERE-TROPOSPHERE EXCHANGE PROCESSES AND THEIR IMPACT ON THE OZONE BALANCE IN THE

SUBTROPICS OF THE SOUTHERN HEMISPHERE: A MULTI-SCALE INTEGRATED STUDY

BASED AT CERRO TOLOLO (30ºS, 70ºW, 2200 M.A.S.L)FONDECYT 1030809 (2003-2006)/FONDECYT-INT 7030071 (2003)

● Which are the mechanisms that explain the spring ozone maximum observed in the southern subtropics...Tololo and Pascua?

a) Stratosphere-troposphere exchange (STE)?

b) Biomass burning in the tropics?

c) All above● When is there STE? And then, which is the relative

importance of advection, subsidence and turbulent mixing?

● Are these phenomena well represented in models?

FONDECYT (1030809) 2003-2006Questions

What we promised to do:

● Analyze available data● Perform 1.5 intensive spring campaigns

(soundings)● Measure 7Be (1 yr) and CO (1 week)● Model the dispersion of an ozone like tracer ● Write papers● Train students

SIMULATING CAMPAIGN SCENARIOS: Synoptic Conditions & Dispersion of an O3 like tracer

L. Gallardo, M. Rojas, R. Alcafuz, I. Ramos, A. Valdebenito.

To be continued

Contents

• What we want to simulate– MM5 and synop

conditions– Ozone like tracer using

MATCH

• What is next

Simulating an ozone like tracer…regional/mesoscales

SQcct

c

)'vc'.(-v..v

+BC (Dirichlet/Neumann) +IC

Photolysis and deposition

+Estimating the influx?

Nov. 2004

Next steps

● Simulating ozone like profiles over Rapanui using MM5-MATCH for Nov. 2003

● Simulating synoptic conditions for both campaigns

● A two year (1996-1997) run over Rapanui?● Coupling MM5-KAMM-MATCH● Thinking of good BC when encountering the

Andes