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Giovanni Online Users Manual: 21. TES Giovanni

Tropospheric Emission Spectrometer (TES) Giovanni

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All of the questions below are linked to descriptive answers in this chapter of the Giovanni Online Users Manual regarding the Giovanni Tropospheric Emission Spectrometer (TES) instance. Click the question of interest.

  1. What TES data types are available in this instance?




What is TES?

The Tropospheric Emission Spectrometer (TES) is one of four instruments on board NASA's EOS (Earth Observing System) Aura satellite launched July 15, 2004. TES is an infrared, high spectral resolution Fourier Transform Spectrometer (FTS). TES has been collecting atmospheric profiles since September 18, 2004. It operated in both nadir and limb modes, with the routine limb modes terminated in May 2005.

What TES data types are available in this instance?

Giovanni currently offers TES Level-3 Daily (Global Survey) data.


What is a TES Global Survey?

TES Level-3 data are only defined for Global Survey measurements. A single TES Global Survey is an operational mode that makes nadir and limb (September 2004 to April 2005), or nadir only (since May 2005) measurements continuously for 16 orbits (~26 hours). TES routine Global Survey observations are conducted in one-day-on, one-day-off cycles, for the main purpose of extending overall TES instrument lifetime.

Table of dates for which TES data are available


What is the temporal resolution of TES data?
TES Level-3 data are produced as daily (single Global Survey) files approximately every other day [seel link directly above to table listing available data]. These data cover roughly one day's worth (~26 hours) of data. They do not begin at 00:00 UTC and will extend into the next day. Monthly Level-3 data are also available, but at this time Giovanni only offers the Daily data.


How are the Level 3 TES data gridded?

The Level-3 daily data are made from the Level-2 TES Global Surveys which are near-global extending from about latitude 82° North to 82° South. The data are gridded at 2.0° latitude by 4.0° longitude resolution using Delauney triangulation, and are then interpolated at each pressure level (except over poles where extrapolation is used).  See the Level 3 User's Guide:

 [ ] for details.

What is the current version of the data available in the Giovanni TES instance?

The Giovanni instance currently hosts TES Level-3 Version 2 data.

TES Level-3 Version 2 includes the following parameters: methane (CH4), carbon monoxide (CO), water vapor (H2O), deuterated water vapor (HDO), nitric acid  (HNO3), ozone (O3), and atmospheric temperature.
There are 7 products and several parameters per product. TES Level-3 data are collected in two modes: Nadir mode  (the current mode), and Limb mode (which only occurred for first 9 months of mission).   Thus, Limb mode data are only available until April 2005.  In the list below, only HNO3 is Limb mode data.   Units are shown on the right;  vmr stands for "volume mixing ratio'.

Nadir Mode products/parameters (2004-09-18 to present):

Methane (TL3CH4D.002)
  CH4 at Surface (Nadir) vmr
  CH4 Profile (Nadir) vmr
  CH4 Total Column Density (Nadir) molecules/cm2

Carbon Monoxide (TL3COD.002)
  CO at Surface (Nadir) vmr
  CO Profile (Nadir) vmr
  CO Total Column Density (Nadir) molecules/cm2

Water Vapor (TL3H2OD.002)
  H2O at Surface (Nadir) vmr
  H2O Profile (Nadir) vmr
  H2O Total Column Density (Nadir) molecules/cm2

Hydrogen Deuterium Oxide (TL3HDOD.002)
  HDO at Surface (Nadir) vmr
  HDO Profile (Nadir) vmr
  HDO Total Column Density (Nadir) molecules/cm2

Ozone (TL3O3D.002)
  O3 at Surface (Nadir) vmr
  O3 Profile (Nadir) vmr
  O3 Total Column Density (Nadir) molecules/cm2
  O3 Tropospheric Column Density (Nadir)  molecules/cm2


Atmospheric Air Temperature (TL3ATD.002)

Air Temperature at Surface (Nadir/Day)


Air Temperature at Surface (Nadir/Night)


Air Temperature Profile (Nadir/Day)


Air Temperature Profile (Nadir/Night)

Surface Temperature (Nadir/Day) K
Surface Temperature (Nadir/Night) K


Limb Mode products/parameters (2004-09-18 to 2005-04-09):

Nitric Acid (TL3HNOD.002)

   HNO3 at Surface (Nadir) vmr
   HNO3 Profile (Nadir) vmr
   HNO3 Total Column Density (Nadir) molecules/cm2

Individual parameters are selected by clicking in the check boxes. An entire group may be selected by clicking the group box (leftmost column heading bar, next to the collection name and date range information). If this selection is performed, individual parameters may then be deselected by clicking in the appropriate check box(es).

he spatial area of interest can be selected by either of the two methods described below

Java applet map: The Java applet map can be utilized to "click and drag" a selection box to designate the spatial area of interest.

Geographic coordinates: The geographic coordinates of the corners of the spatial area box can be input individually. This method can be used if Java is not enabled. Note that decimal and not degree (seconds and minutes) coordinates must be entered.

If three-dimensional visualizations are selected, if an area or point is chosen, the values returned are for the interpolated grid cell.

The starting date (year/month/day), and the ending date (year/month/day) for the analysis are selected using the calendrical menus on the Giovanni interface page. Error messages will be generated if the beginning month or the end month are out of the data set time range, or if the end month is before the beginning month. Note that the time ranges are shown for each data set.
Since TES data are collected only about once every other day, please see the TES data availability table for when data are available.

The plotting preference options are described in the Plot Preferences section of the Online Users Manual.

After the initial output has been generated, the temporal and spatial ranges (constraints) and plotting preferences can be changed, and a new output generated, using the "Submit Refinements" button.


How should TES data be used?

The main use for TES Level-3 data is for data exploration and browsing. Most  scientific analysis therefore should treat TES Level 2 data as the primary  data source. Please goto the TES archive at the Langley ASDC [] to access the  original data files.

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Last updated: Apr 07, 2016 04:26 PM ET