Last modified October 9, 2002
 Atmospheric Chemistry Modeling Group Home
Page
INTEX-NA Background and
Objectives:
INTEX-NA is an integrated atmospheric chemistry field experiment to quantify
North American
export and import of ozone and its precursors, aerosols, and
long-lived greenhouse gases.
The observational database will be obtained in two intensive airborne
missions to be
B
performed in the summer of 2004 (Phase A), when photochemistry is most
intense and cl
imatic issues involving aerosols and the carbon cycle are most pressing, and
in the
spring 2006 (Phase B), when Asian transport to North America is at its peak.
The synthesis of the ensemble of observations from surface, airborne, and
space platf
orms will be used to achieve the following main objectives:
- Quantify the export, chemical evolution, and
transformation of
radiatively and chemically important trace gases and aerosols from North
America to the Western Atlantic (Phase A)
- Quantify the impact of Asian pollution on the eastern
Pacific as
input to North America (Phase B)
- Elucidate mechanisms and pathways associated with the
transport
and transformation of these trace chemicals
- Utilize INTEX-NA airborne platforms to test and evaluate satellite (Aura /Terra) observations in the troposphere
- Contribute to carbon cycle research with a focus on providing vertical and horizontal structure of chemically relevant trace gases and aerosols across North America
[TOP]
ITCT-2K4 Background and
Objectives:
ITCT is a research activity
of the International Global Atmospheric Chemistry Program (IGAC).
The goal of ITCT is to provide a better understanding of the
intercontinental transport and chemical transformation of anthropogenic
pollution in the Northern Hemisphere and to assess the consequences of this
pollution.
Two ITCT field studies are planned, ITCT-2K2 and ITCT-2K4.
ITCT-2K2, whose field component took place April-May 2002, is investigating the composition of
spring-time air masses along the Pacific coast of North America.
ITCT-2K4, whose field component is scheduled for summer 2004,
will focus on observations needed to constrain and evaluate model estimates
of the outflow of chemicals from North America across the Atlantic.
The synthesis of the ensemble of observations from surface, airborne, and
space
platforms will be used to achieve the following main objectives:
- Quantify the export, chemical evolution, and
transformation
of radiatively and chemically important trace gases and aerosols from North
America to the Western Atlantic
- Elucidate mechanisms and pathways associated with the
transport and transformation of these trace chemicals
- Relate the optical properties of aerosols to their
microphysical and chemical properties and identify the processes that
determine those properties
[TOP]
More information:
[TOP]
Planning movies - North American Map of
CO (INTEX-NA domain)
June-July 2001 GEOS-3 * **
Animations of Total CO
- Level 7 (Sigma=.90, approx. ht= .98 km, approx. press= 900 mb)
- Level 10 (Sigma=.75, approx. ht= 2.5 km, approx. press= 750 mb)
- Level 13 (Sigma=.50, approx. ht= 5.0 km, approx. press= 540 mb)
- Level 16 (Sigma=.30, approx. ht= 8.5 km, approx. press= 330 mb)
Still-image gifs of CO emission
June-July 1997 GEOS-STRAT * **
Animations of Total CO
- Level 4 (Sigma=.87, approx. ht= 1.2 km, approx. press= 875 mb)
- Level 6 (Sigma=.74, approx. ht= 2.5 km, approx. press= 745 mb)
- Level 9 (Sigma=.54, approx. ht= 5.0 km, approx. press= 540 mb)
- Level 13 (Sigma=.30, approx. ht= 9.1 km, approx. press= 300 mb)
Still-image gifs of CO emission
* Altitudes and pressures computed assuming 1000 hPa surface pressure
-
Click here for GEOS-CHEM vertical
resolution information
** Higher resolution June-July 1997 and 2001 animations available via ftp by request to rch@io.harvard.edu
[TOP]
Atmospheric Chemistry Modeling Group Home Page
This web page is maintained by Rynda Hudman
(rch@io.harvard.edu)
http://www-as.harvard.edu/chemistry/trop/intex/index.html
|
