INTRODUCTORY REMARKS
GTE/TRACE-P
FINAL CHEMICAL AND METEOROLOGICAL
DATA
The Global Tropospheric
Experiment (GTE) is a continuing field measurement component
of the National Aeronautics and Space Administration's (NASA's)
Tropospheric Chemistry Program. As part of GTE, the Transport
and Chemical Evolution over the Pacific (TRACE-P)
mission was conducted over the western
Pacific Ocean from February - April 2001. These data
plots contain a selected subset of the GTE/TRACE-P Project data
and data acquired by investigator
instruments recorded onboard the NASA Dryden
Flight Research Center DC-8 aircraft and the Wallops
Flight Facility P-3B aircraft during the TRACE-P mission. This
presentation of data is not intended to support original research/analyses,
but should assist in identifying data that are of interest. Hardcopy
documents are available in two volumes. Volume one contains
the presentation of data for the DC-8 aircraft and Volume two
contains a similar presentation for the P-3B aircraft. Contact
information to obtain hardcopy volumes follows at the end of
these remarks.
Abscissa time scales for a given flight are identical. Ordinate
scales for most flight and species are selected by the plotting
software. In a few cases, however, ordinate scales are selected
manually to best represent that data measured for a specie during
the flight; some data may be off-scale. In such a case, the
max or min of the data clipped are provided. As a result
of the software used for the plots and the data archive use of
codes (in place of valid data) for data taken (1) during instrument
calibration, (2) when measurements were at "detection limit" and/or
(3) when measurements are invalid, it is sometimes difficult to
distinguish from the plots if data are off-scale or have
been coded as invalid. For example, a symbol without an attached
line may either mean that adjacent data are off-scale or have been
coded as invalid. Inspection of the other plotted data often
provides information which may resolve the uncertainty.
In order to maintain the standardized format, plots for flights
in which a specie data are not available are plotted with the axes
and a "NO DATA" entry. Please note that the label "NO
DATA" is used whether final data (1) is not now available
and may be available later or (2) may never be available
for a flight. A parameter was not selected for plotting if
it was known that it would never be available for any flight.
GMT time has been plotted with a continuous numerical scale beyond
24 hours to conform to the available plotting routine. GMT
midnight is always 24 hours.
Additional supporting data products available from the GTE Data
Management Office include:
- TRACE-P
Expedition Plan - An overview of the scientific objectives,
experiment design, and data management plan for the field experiment.
- Videotapes
from each flight - Forward-looking and nadir view videotapes
are available from both the DC-8 and the P-3B aircraft. Tapes
with quad images are also available for the DC-8 (forward,
nadir, weather radar, stormscope) and the P-3B (forward +10o,
forward -10o, nadir, stormscope).
- Ozonesonde
data - Correlative measurements from the following sites
are available from pre-expedition through spring 2002 at a
rate of once per week. Trinidad Head, California; Hilo, Hawaii;
Cheju Island, Korea; Sapporo, Tsukuba (Tateno), Naha, and Kagoshima,
Japan; Hong Kong; and Taipei, Taiwan.
TRACE-P meteorological products available are:
- Synoptic
Overview - Brief meteorological discussions of each DC-8
and P-3B flight mission, including streamlines, profiles and
satellite imagery.
- Airmass
trajectories - Five-day back trajectories for each flight.
- Satellite
Imagery - A collection of GOES 8, GOES 10, and GMS images
are available for the TRACE-P period. Images corresponding
to each flight with the aircraft flight tracks superimposed
are included in the data archive.
This is a product of the Langley GTE Data Archive Office. Inquiries
about products available from the GTE Data Archive should be addressed
to:
NASA GTE Data Manager
Mail Stop 483
NASA Langley Research Center
Hampton, VA 23681-2199
ATTN: Clyde Brown
Phone: (757) 864-5839
Fax: (757) 864-7790
Email: gte+archive@larc.nasa.gov