Project Description
The TIROS Operational Vertical Sounder (TOVS) Pathfinder Path A
dataset contains atmospheric profiles (primarily temperature
and humidity) and surface and cloud parameters derived using
one of three conceptually distinct algorithms identified by the
TOVS Science Working Group (SWG) in November 1991. The purpose
of the Pathfinder Project is to make research-quality global
change data sets easily available to the science community in
support of the US Global Change Research Program (USGCRP) using
long term space-based radiance measurements. The initial set of
level 3 geophysical products have been derived for the
Pathfinder benchmark period from April 1987 through November


Joel Susskind, Satellite Data Utilization Office
Code 910.4
NASA/Goddard Space Flight Center
Greenbelt, Md. 20771

The basic methodology used to retrieve geophysical parameters
from the TOVS observations involves use of an interactive
forecast-retrieval-analysis scheme in which the first guess
information for the retrievals (surface pressure, temperature
profile, and moisture profile) comes from a 6 hour forecast
generated by a general circulation model. This information,
together with the observed radiances, is used to generate
retrievals for the 6 hour period centered on the forecast
time. An analysis is then performed using these retrievals and
all available in situ data for that time period. This is then
used as input to the forecast model and the cycle is repeated
for the next 6 hour period.

For more information, link to

[Summary provided by NASA]