HR: 0830h
AN: A41E-0733    [PDF]
TI: AIRS/AMSU/HSB Data at Goddard Earth Science DISC DAAC
AU: Cho, S
EM: cho@daac.gsfc.nasa.gov
AU: Qin, J
EM: jcq@daac.gsfc.nasa.gov
AU: Li, J
EM: jyli@daac.gsfc.nasa.gov
AU: * Lu, L
EM: lu@daac.gsfc.nasa.gov
AB: The Atmospheric Infrared Sounder (AIRS) data product suite is now available at the NASA/GSFC Distributed Active Archive Center (GDAAC) located at the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) in Greenbelt, Maryland, USA. AIRS data products are a combination of AIRS, Advanced Microwave Sounding Unit (AMSU-A) and Humidity Sounder for Brazil (HSB) measurements. Global coverage by the instruments is obtained twice daily (day and night) and the data along the orbit is processed into 6-minute granules. AIRS alone has 2,378 channels measuring in the infrared range 3.74-15.4 mm and four channels measuring in the visible/near-infrared range 0.4-1.1mm. A day's worth of AIRS data is divided into 240 scenes each of 6 minute duration. The data is produced in HDF-EOS format and generally become available 30-36 hours after satellite measurement from the GDAAC. Level1B data (calibrated, geo-located radiances) contains radiances from 2378 AIRS infrared channels in the 3.74 to 15.4 æm and 4 visible/near infrared channels in the 0.4 to 1.0 æm, and brightness temperature from 15 AMSU-A channels in the 50 - 90 GHz and 23 - 32 GHz and 4 HSB in the 150 - 190 GHz. The brightness temperature from two microwave instruments is used to initialize the surface temperature and atmospheric temperature profile required for the retrieval of the final AIRS geophysical products. Level2 data (geophysical parameters) is grouped into three products - Cloud-Cleared Infrared Radiance, Standard Retrieval, and Support Retrieval. The retrieval products contain atmospheric parameters such as temperatures, humidity, cloud, water vapor, and ozone in 28 pressure levels and 100 pressure levels respectively. Support Retrieval product is intended for the knowledgeable, experienced user of AIRS/AMSU-A/HSB products. It contains high resolution profiles intended to be used for computation of radiances, as-yet unimplemented research products and various parameters and intermediate results used to evaluate and track the progress of the retrieval algorithm. AIRS/AMSU-A/HSB data products can be ordered on line at no cost via the GDAAC Search and Order interface or the EOS Data Gateway (EDG). Most recent data may also be obtained from the Data Pool, an online cache that provides FTP access for quick download. Daily summary browse images and preview images of individual data granules are also accessible from the search interfaces to help users evaluate the data prior to ordering or downloading. The Atmospheric Dynamics Data Support Team (ADDST) at GDAAC is providing science and data support to assist users in understanding, accessing, and applying the AIRS data products. An extensive informational AIRS data support web site has been prepared by ADDST for data users at http://daac.gsfc.nasa.gov/atmodyn/airs/
DE: 1640 Remote sensing
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting