MLS/Aura Level 2 Methyl Chloride (CH3CL) Mixing Ratio V004

Metadata Updated: December 18, 2017

ML2CH3CL is the EOS Aura Microwave Limb Sounder (MLS) standard product for methyl chloride derived from radiances measured by the 640 GHz radiometer. The current version is 4.2. Data coverage is complete from August 8, 2004 to current. Spatial coverage is near-global (-82 deg. to +82 deg. latitude), with each profile spaced 1.5 deg. or ~165 km along the orbit track (roughly 15 orbits per day). The recommended useful vertical range is between 147 and 4.64 hPa, and the vertical resolution ranges between 4-6 km in the lower stratosphere and 8-10 km above 14 hPa. Users of the ML2CH3CL data product should read section 3.3 of the EOS MLS Level 2 Version 4 Quality Document for more information (

  Users are encouraged to register with the MLS science team at to obtain updates and information about this data product.

  The data are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5), which is based on the version 5 Hierarchical Data Format, or HDF5. Each file contains one swath object (with profile data), with a set of data and geolocation fields, swath attributes, and metadata. The data fields include the geophysical parameter values and precision (standard deviation), convergence values, data quality, and a status flag. The geolocation fields include a time stamp in TAI-93 format (seconds since January 1, 1993), geodetic latitude and longitude, and pressure level values, as well as local solar time, solar zenith angle, line of sight angle, and orbit geodetic angle. There is one file per day.

Access & Use Information

Public: This dataset is intended for public access and use. License: U.S. Government Work

Downloads & Resources


Metadata Created Date July 8, 2015
Metadata Updated Date December 18, 2017

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date July 8, 2015
Metadata Updated Date December 18, 2017
Publisher GESDISC
Unique Identifier C214910128-GSFCS4PA
Maintainer Email
Id {$oid: 55942ab1c63a7fe59b49a3a6}
Public Access Level public
Bureau Code 026:00
Metadata Context
Schema Version
Catalog Describedby
Harvest Object Id b47e8215-9f88-4ef8-be40-acddbfebeeab
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2014-10-16T00:00:00.000Z
Language en-US
Metadata Type geospatial
Data Last Modified 2015-02-20T00:00:00.000Z
Program Code 026:001
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > GESDISC
Source Datajson Identifier True
Source Hash 054be168f19cec46ad13010401815b534047419d
Source Schema Version 1.1
Spatial -180.0 -82.0 180.0 82.0
Temporal R/2004-08-08T00:00:00Z/P1Y
Category geospatial

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