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AIRS L3 Standard daily product (AIRS/AMSU)

Product Description Product Summary
airx3std.jpg

AIRX3STD data sample


The AIRS Level 3 Daily Gridded Product contains standard retrieval means, standard deviations and input counts.  Each file covers a temporal period of 24 hours for either the descending (equatorial crossing North to South @1:30 AM local time) or ascending (equatorial crossing South to North @1:30 PM local time) orbit. The data starts at the international dateline and progresses westward (as do the subsequent orbits of the satellite) so that neighboring gridded cells of data are no more than a swath of time apart (about 90 minutes). The two parts of a scan line crossing the dateline are included in separate L3 files, according to the date, so that data points in a grid box are always coincident in time.  The edge of the AIRS Level 3 gridded cells is at the date line (the 180E/W longitude boundary). When plotted, this produces a map with 0 degrees longitude in the center of the image unless the bins are reordered. This method is preferred because the left (West) side of the image and the right (East) side of the image contain data farthest apart in time. The gridding scheme used by AIRS is the same as used by TOVS Pathfinder to create Level 3 products. The daily Level 3 products have gores between satellite paths where there is no coverage for that day.

The geophysical parameters have been averaged and binned into 1°x1° grid cells, from -180.0° to +180.0° longitude and from -90.0° to +90.0° latitude. For each grid map of 4-byte floating-point mean values there is a corresponding 4-byte floating-point map of standard deviation and a 2-byte integer grid map of counts. The counts map provides the user with the number of points per bin that were included in the mean and can be used to generate custom multi-day maps from the daily gridded products.

The geophysical parameters are: Skin Temperature, Surface Air Temperature, Air Temperature, Tropopause, Precipitable Water, Water Vapor, Cloud Amount/Frequency, Cloud Height, Cloud Top Pressure, Cloud Top Temperature, Reflectance, Emissivity, Sea Surface Temperature, Ozone, Surface Pressure, Cloud Vertical Distribution, Methane and Carbon Monoxide.

GES DISC Data Access

ESDT Shortname:
AIRX3STD
Coverage:
Global, Daily 
Resolution:
Horizontal: 1 x 1 deg Vertical: up to 24 pressure levels 

Volume:
71 MB/file, 1 file/day 

Product Guide:
AIRS User Guide
+ Quickstart Guide 

Instrument Guide:
AIRS Instrument Guide

To Plot L3 AIRS Temperatures 
(can save the image as well)
idl -novm -rt=
l3_quick_temp.sav –args 
 filename level(option) autoscale(option)
                                       
Example: 
idl -novm -rt=l3_quick_ temp.sav -args AIRS.2007.
03.13.L3.RetStd001.v4.0.
9.0.G07074152508.hdf 2 
autoscale level: 1-24 levels with default 1 which is 1000 mb 
(1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100,
 70, 50, 30, 20, 15, 10, 7, 5, 3, 2, 1.5,1) 
scale: default 230-330 K 
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Last updated: Dec 02, 2011 03:20 PM ET