MLS/Aura Level 2 Hydrogen Cyanide (HCN) Mixing Ratio V002 (ML2HCN) at GES DISC
Entry ID: GES_DISC_ML2HCN_V002

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Summary
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 2.3. 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 from 10 to 0.1 hPa, and the vertical resolution is between 8 and 12 km. Users of the ML2HCN data product should read section 3.9 of the EOS MLS Version 2.2 and 2.3 Level 2 Data Quality and Description Document for more information (http://mls.jpl.nasa.gov/data/v2_data_quality_document.pdf).

Users are encouraged to register with the MLS science team at https://mls.jpl.nasa.gov/forms/reguser.php 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 two swath objects (one with profile data, the other with column data), each 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.

Related URL
Link: GET DATA > ON-LINE ARCHIVE
Description: Access the data via anonymous FTP.


Link: GET DATA > MIRADOR
Description: Access the data through the GES-DISC Mirador fast data search and download system.


Link: GET DATA > OPENDAP DIRECTORY (DODS)
Description: Access the data via the OPeNDAP protocol.


Link: GET DATA > THREDDS CATALOG
Description: Access the data using the THREDDS Catalog.


Link: GET DATA > REVERB
Description: Reverb, the ECHO client, allows one to search and retrieve data across multiple data archive centers.


Link: VIEW PROJECT HOME PAGE
Description: The MLS home page at NASA JPL.


Link: VIEW RELATED INFORMATION > USER'S GUIDE
Description: README document


Geographic Coverage
 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 Level 2 Hydrogen Cyanide (HCN) Mixing Ratio
Dataset Series Name: ML2HCN
Dataset Release Date: 2007-01-08
Dataset Release Place: Greenbelt, MD, USA
Dataset Publisher: NASA Goddard Earth Science Data and Information Services Center
Version: 002
Data Presentation Form: Digital Science Data
Online Resource: http://disc.gsfc.nasa.gov/datacollection/ML2HCN_V002.html


Temporal Coverage
Start Date: 2004-08-08


Location Keywords
GEOGRAPHIC REGION > GLOBAL
VERTICAL LOCATION > MESOSPHERE
VERTICAL LOCATION > STRATOSPHERE


Data Resolution
Latitude Resolution: 300 km at limb tagent point (along-track)
Longitude Resolution: 3 km at limb tagent point (cross-track)
Vertical Resolution: 3 - 6 km
Temporal Resolution: Twice per day; Day and Night; Orbital repeat cycle 16 days


Science Keywords
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >CARBON AND HYDROCARBON COMPOUNDS >HYDROGEN CYANIDE    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
AURA >Earth Observing System, Aura    [Information]


Instrument
MLS >Microwave Limb Sounder    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
AURA >Earth Observing System (EOS), AURA    [Information]
CWIC >CEOS WGISS Integrated Catalog    [Information]


Use Constraints
Users are encouraged to register with the MLS science team at https://mls.jpl.nasa.gov/forms/reguser.php to obtain updates and information about this data product.


Keywords
HCN
EOSDIS


Data Set Progress
IN WORK


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    [Information]
Data Center URL: http://disc.gsfc.nasa.gov/

Data Center Personnel
Name: GES DISC HELP DESK SUPPORT GROUP
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
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
Distribution_Media: Online (FTP)
Distribution_Size: 0.82 MB per file
Distribution_Format: HDF-EOS5 (Swath)
Fees: None


Personnel
MLS SCIENCE TEAM
Role: TECHNICAL CONTACT
Phone: 818-354-6716
Email: data at mls.jpl.nasa.gov
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


NATHANIEL LIVESEY
Role: INVESTIGATOR
Email: livesey at mls.jpl.nasa.gov
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


JAMES EDWARD JOHNSON
Role: DIF AUTHOR
Phone: 301-614-5121
Email: James.Johnson at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 610.2
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Publications/References
* 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 variability of HCN in the troposphere and lower stratosphere?", Atmos. Chem. Phys. 9, 8531-8543, 2009.

* Pumphrey, H.C., C. Boone, K.A. Walker, P. Bernath, and N.J. Livesey, "The tropical tape recorder observed in HCN", Geophys. Res. Lett. 35, L05801, doi:10.1029/2007GL032137, 2008.

* Cofield, R.E., and P.C. Stek, "Design and field-of-view calibration of 114-660 GHz optics of the Earth Observing System Microwave Limb Sounder", IEEE Trans. Geosci. Remote Sensing 44, no. 5, 1166-1181, May 2006.

* Pumphrey, H.C., C.J. Jimenez, and J.W. Waters, "Measurement of HCN in the middle atmosphere by EOS MLS", Geophys. Res. Lett. 33, L08804, doi:10.1029/2005GL025656, 2006.

Creation and Review Dates
DIF Creation Date: 2006-09-20
Last DIF Revision Date: 2014-10-30
Future DIF Review Date: 2015-06-01

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