The High Resolution Dynamic Limb Sounder (HIRDLS) team is pleased to announce the release of its Version 007 atmospheric data products. It is expected that this will be the final version of HIRDLS data. These data are now publicly available from the NASA GSFC Earth Sciences Data and Information Services Center (GES DISC). The HIRDLS latest improved algorithms (V7.00.00 and V7.05.00) include newly added measurements of H2O, N2O, NO2, and ClONO2. Previously released temperature, geopotential height, and species O3, HNO3, CFC-11, CFC-12, NO2, N2O5, plus clouds, aerosol extinction, and ice water content (joint with the Microwave Limb Sounder, MLS) are of better quality than previous versions. All HIRDLS products have a vertical resolution of 1 km, and are spaced approximately 100 km apart along the orbit track. HIRDLS data are available from January 29 , 2005 through March 17, 2008.
HIRDLS Version 007 daily zonal means of CFC-11 (top) and CFC-12 (bottom) for 18 May 2006. The black contour lines show the potential temperature surfaces (units: K). The regions of high values in the tropical upper troposphere/lower stratosphere (UTLS), seen in Version 006, were an artifact of aerosols affecting the retrieval process, and have been corrected in Version 007. Click on either image to view it larger.
The Version 007 data products which have been released include:
The HIRDLS2 instrument resolution data contain daily atmospheric concentrations of O3, HNO3, CFC-11, CFC-12, ClONO2, N2O, N2O5, NO2, H2O, vertical profiles of temperature, geopotential height and aerosol extinction at 8.3 and 12.1 µm, as well as cloud top pressure. The HIRDLS2 data have a vertical resolution of about 1 km, and are spaced approximately 100 km apart along the orbit track (approximately 5600 profiles per day) between latitude 80° north and 63° south.
- Level-3 Mapping Coefficient Products
The Level-3 Zonal Fourier Coefficients data (H3ZFC*) are created by applying a Kalman filter mapping algorithm of the Level-2 data at 1° latitude bands over the entire mission from January 29, 2005 through March 17, 2008 at daily temporal resolution on the 1 km Level 2 vertical grid. Users can use the zonal means plus coefficients for a latitude to calculate values at any longitude. The O3, HNO3, CFC-11, CFC-12, ClONO2, N2O, N2O5, NO2, H2O, temperature, geopotential height and aerosol extinction at 8.3 and 12.1 µm are available as Level-3 Mapping Coefficient Products.
There are two HIRDLS gridded data products available. HIR3SCOL contains Level-3 daily gridded 1° x 1° stratospheric columns of daytime NO2 measurements on the same 1 km Level-2 vertical grid over the entire HIRDLS mission. The second product HIRMLS3IWC (Version 002) is a joint HIRDLS and MLS/Aura Level-3 monthly gridded 10° x 20° ice water content (IWC) product. HIRDLS data are derived from the version 7 Level-2 product (HIRDLS2), and the MLS data are derived from the version 3 Level-2 product (ML2IWC).
Note: Users should first review the HIRDLS Data Description and Quality document for Version 007 (PDF) before using the HIRDLS data products. Additional information on the IWC data product is available in the High Resolution Dynamics Limb Sounder Earth Observing System (EOS) Ice Water Content (IWC) Document (MS Word).
Links to data and information:
HIRDLS is one of four instruments on the NASA Aura Earth Observing System (EOS) satellite.
Questions or comments? Email the NASA GES DISC Help Desk: firstname.lastname@example.org