TES Quick Start
Guide
The primary location for
obtaining TES data is the Earth
Observing System (EOS) Data Gateway. A secondary location for obtaining TES
data is the Langley ASDC
data pool. The data pool has space limitations that make it somewhat dynamic,
therefore older versions of TES data may not be available there. The Aura Data
Validation Center provides information on subsets and validation data.
Documentation is available
at the TES Data Sets
page at the Langley ASDC and at the TES website. Documents useful for the
beginning user of TES data include:
•
TES L2 Data
User’s Guide v4.0
•
TES Validation Reports
v4.0
•
TES Data Product Specification
document (v 11.8)
•
TES Level
2 Data Quality Statement v4.0
•
An Example
Use of TES Data – explains how to find, browse plots of, download, plot,
and do comparisons of TES Level 2 data to sondes or atmospheric model results. This
document includes information useful for modelers, and uses IDL as the means
for working with the data.
•
The L3
Data/Plot User’s Guide and the L3 Algorithms,
Requirements & Products documents provide a starting reference for
using TES L3 data, and provide a good summary of TES L2.
Core TES products are Level
1B Radiances Temperature, O3, CO, HDO, H2O, CH4, SST, Cloud Top Pressure, Cloud
Effective Optical Depth, HNO3. Information on their biases and validation are
summarized in this validation
table, and are found within TES validation reports
and validation papers.
TES web pages useful for a
new data user include:
•
Details of TES nadir
observations at the orbit and coverage
page.
•
Tables on the evolution of the Global
Survey and Special Observation modes.
•
TES L2 science browsing plots for
Special Observations and field campaigns.
•
Measurement records for
Global Surveys and Special Observations (run ID tables) allow users to map TES
run ID numbers to date and observation type
•
Visualizations,
including collections of monthly-averaged
nadir Global Surveys for the various species and pressure levels, daily and
monthly averaged L3
plots (including Google Earth kmz format), L2 regional
time trends and Google
Earth kmz files for all Special Observation L2 vertical profiles, and for
selected Global Surveys.
Information on TES
sensitivity for various species is different for each profile and can be found
as the "diagonal of the averaging kernel". You can see this
information on the existing L2 quick-look plots for
Special Observations on the TES web site.
TES data fields
TES data fields are listed
within the TES Data Product
Specification documents (most recent is v11.8). The TES
Read Software and accompanying README files explain the syntax for how to
call individual IDL programs within the read software. The Example
Use of TES Data (Kulawik) can also be referred to when first opening an L2
file in IDL. There is also a page describing the steps needed to make
comparisons of TES nadir retrievals to your profiles with higher vertical
resolution.
How does TES store vmr and altitude in the database
fields within L2 data products?
When you open a TES L2 Data
Product file, at least in IDL, you get a structure. Within that structure there
is a field called “species” that has dimension (67,n) where n is the number of
geolocation points (also known as “TARGETS”) sampled by TES in the global
survey or special observation. The “species” field contains the retrieved
volume mixing ratio (or temperature) profiles measured by TES. A field called
“altitude” (67,n) provides the corresponding altitude information for the
retrieved profiles. The filed “pressure” (67,n) provides the corresponding
pressures for the altitude and species fields.
See also: Summary
information on TES file structure.
If you have questions regarding using the TES data, please contact us via the TES contact form, and a TES science team member will endeavor to answer your questions