Current But Beyond Lifetime
TES Special Observations are research measurements of targeted locations or regional transects which are used to observe specific phenomena or to support local or aircraft validation campaigns. The TES Level 1B products are written in NCSA's HDF5 format. The Level 2 data products are written in HDF-EOS5 (based on HDF5) format. Due to instrument life-time concerns, the acquisition of TES limb data has been suspended during nominal Global Survey operations following April 10, 2005 (Runs greater than 2861).
Detailed at - http://eosweb.larc.nasa.gov/PRODOCS/tes/table_tes.html
Satellite Instruments
The Tropospheric Emission Spectrometer (TES) launched into sun-synchronous orbit aboard Aura, the third of NASA's Earth Observing System (EOS) spacecraft, on July 15, 2004. The primary objective of TES is to make global, three-dimensional measurements of ozone and other chemical species involved in its formation and destruction. TES is a high-resolution imaging infrared Fourier-transform spectrometer that operates in both nadir and limb-sounding modes. TES global survey standard products include profile measurements of ozone, water vapor, carbon monoxide, methane, nitrogen dioxide, and nitric acid for 16 orbits every other day.
Rheinhard Beer
Jet Propulsion Laboratory
Jet Propulsion Laboratory Principal Investigator
Measurment TypeInfrared sounder (unapodized FT)
Platform TypeTES
OrbitSun Synch
Spectral CoverageInfrared 650-3050 cm-1 (3.2-15.4 ┬Ám) Continuous, but with multiple sub-ranges typically 200-300 cm-1 wide
Scan PatternLimb sounder
Variablestropospheric ozone, CO, methane, water vapor, nitrogen dioxide
Repeat Time
Wavelength to
Number of Bands
Temporal Coverage
Swath Width
Resolution 1
Resolution 2
Resolution 3
Resolution 4
Some of Aura's instruments look ahead of the spacecraft, some look behind it, and some look straight down. All four observe approximately the same column of air within about 13 minutes, though they differ somewhat as to the altitudes they cover, so they complement each other's findings. In principle, TES is capable of observing chemicals at any altitude, but in practice it specializes in the portion of the atmosphere that extends from the ground up to the middle of the stratosphere, to an altitude of about 32 km. This includes the entire troposphere, the lowest part of the atmosphere, which stretches from the stratosphere to Earth's surface. TES observes both straight down (nadir view) and at a sideways angle (limb view) behind the satellite. Limb viewing provides a much longer path through the atmosphere, and looking through a larger mass of air improves the chances of observing sparsely distributed substances that might be missed in the nadir view. Limb viewing's sideways angle also makes it easier to determine the altitudes of the observed substances. But limb viewing is very susceptible to interference (only rarely does the line of sight reach the surface). Nadir viewing is less impacted by clouds, but looking straight down makes it more difficult to identify altitudes.
3 Sep 2009 13:47