MLS/Aura L2 Hydrogen Cyanide (HCN) Mixing Ratio V002 ML2HCN at GES DISC

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Abstract: ML2HCN is the EOS Aura Microwave Limb Sounder (MLS) standard product for hydrogen cyanide derived from radiances measured primarily by the 190 GHz radiometer. The current version is 2.2. Spatial coverage is near-global (-82° to +82° latitude), with each profile spaced 1.5° or ~165 km along the orbit track (roughly 15 orbits per day). The recommended useful vertical range is from 10 to 0.1 hPa, ... View entire text
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Geographic Coverage
Spatial coordinates   
  N: 82.0   S: -82.0   E: 180.0   W: -180.0
Min Altitude: 10 HPA Max Altitude: 0.1 HPA

Data Set Citation
Dataset Originator/Creator: EOS MLS Science Team
Dataset Title: MLS/Aura L2 Hydrogen Cyanide (HCN) Mixing Ratio
Version: 002
Online Resource:
Temporal Coverage
Start Date: 2004-08-08
Data Resolution
Horizontal Resolution Range: 100 km - < 250 km or approximately 1 degree - < 2.5 degrees
Vertical Resolution: 3 - 6 km
Temporal Resolution: 1 Day
Use Constraints Users are encouraged to register with the MLS science team at to obtain updates and information about this data product.
Ancillary Keywords
Data Set Progress
Data Center
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA Supplemental Info
Data Center URL:

Data Center Personnel
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Distribution Media: Online (FTP)
Distribution Size: 0.82 MB per file
Distribution Format: HDF-EOS5 (Swath)
Fees: Free
Phone: 818-354-6716
Email: data at
Contact Address:
Mail Stop 183-701, Jet Propulsion Laboratory
4800 Oak Grove Drive
City: Pasadena
Province or State: CA
Postal Code: 91109-8099
Country: USA
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* Pommrich, R., R. Mueller, J.U. Grooss, G. Gunther, P. Konopka, M. Riese, A. Heil, M. Schultz, H.C. Pumphrey, and K.A. Walker, "What causes the irregular cycle of the atmospheric tape recorder signal in HCN?", Geophys. Res. Lett. 37, L16805, 10.1029/2010GL044056, 2010.

* Li, Q., P.I. Palmer, H.C. Pumphrey, P. Bernath, and E. Mahieu, "What drives the observed ... View entire text
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2010-12-16
Last DIF Revision Date: 2011-02-18
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