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Description

M2I3NVCHM (or inst3_3d_chm_Nv) is an instantaneous 3-dimensional 3-hourly data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2). This collection consists of assimilations of carbon monoxide and ozone mixing ratio at 72 model layers. The data is available every three hour starting from 00:00 UTC, e.g.: 00:00, 03:00, … , 21:00 UTC. Section 4.2 of the MERRA-2 File Specification document provides pressure values nominal for a 1000 hPa surface pressure and refers to the top edge of the layer. The lev=1 is for the top layer, and lev=72 is for the bottom (or surface) model layer.

MERRA-2 is the latest version of global atmospheric reanalysis for the satellite era produced by NASA Global Modeling and Assimilation Office (GMAO) using the Goddard Earth Observing System Model (GEOS) version 5.12.4. The dataset covers the period of 1980-present with the latency of ~3 weeks after the end of a month.

Data Reprocessing: Please check “Records of MERRA-2 Data Reprocessing and Service Changes” linked from the “Documentation” tab on this page. Note that a reprocessed data filename is different from the original file.

MERRA-2 Mailing List: Sign up to receive information on reprocessing of data, changing of tools and services, as well as data announcements from GMAO. Contact the GES DISC Help Desk (gsfc-dl-help-disc@mail.nasa.gov) to be added to the list.

Questions: If you have a question, please read "MERRA-2 File Specification Document", “MERRA-2 Data Access – Quick Start Guide”, and FAQs linked from the ”Documentation” tab on this page. If that does not answer your question, you may post your question to the NASA Earthdata Forum (forum.earthdata.nasa.gov) or email the GES DISC Help Desk (gsfc-dl-help-disc@mail.nasa.gov).

Version Description

The GEOS-5 model version used for processing MERRA-2

Product Summary

Platforms
MERRA-2
Instruments
NOT APPLICABLE
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Spatial Resolution
0.625 Decimal Degrees x 0.5 Decimal Degrees
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
1980-01-01 to Present
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C1276812901-GES_DISC
Data State
ACTIVE
Number of Files/Granules
16893
Processing Level
4
Published
Updated
Science Keywords
Atmospheric Carbon Monoxide ,
Atmospheric Ozone ,
Pressure Thickness ,
Surface Pressure ,
Tropospheric Ozone ,
Carbon Monoxide ,
Air Mass/Density

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Global Modeling And Assimilation Office, & Pawson, S. (2015). MERRA-2 inst3_3d_chm_Nv: 3d,3-Hourly,Instantaneous,Model-Level,Assimilation,Carbon Monoxide and Ozone Mixing Ratio V5.12.4 [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/HO9OVZWF3KW2 Date Accessed: 2026-05-21

Documents

Publications Citing This Dataset

Filters
Title Year Author Topic
Deep learning-based adjoint modeling for daily CO estimations Lee, Hyun-Jeong, Cho, Dongjin, Ham, Yoo-Geun Atmospheric Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density
Correlated Modes of Spatiotemporal Variations Between Biomass Burning Chutia, Lakhima, Wang, Jun, Chen, Xi, Lu, Zhendong, Zhou, Meng, Wilcox, Eric M. Aerosols, Aerosol Extinction, Aerosol Optical Depth/Thickness, Angstrom Exponent, Aerosol Particle Properties, Carbonaceous Aerosols, Dust/Ash/Smoke, Organic Particles, Sulfate Particles, Sulfur Oxides, Sulfur Compounds, Sulfate, Sulfur Dioxide, Sulfur Oxides, Particulate Matter, Dimethyl Sulfide, Black Carbon, Sea Salt, PARTICULATE MATTER (PM 2.5), PARTICULATE MATTER (PM 10), PARTICULATE MATTER (PM 1.0), Atmospheric Ozone, Sea Level Pressure, Surface Pressure, U/V Wind Components, U/V Wind Components, Potential Vorticity, Vertical Wind Velocity/Speed, Vertical Profiles, Upper Air Temperature, Air Temperature, Relative Humidity, Specific Humidity, Atmospheric Water Vapor, Cloud Liquid Water/Ice, Altitude, Geopotential Height, Ozone Profiles, Carbon Monoxide, Tropopause, Methane, Outgoing Longwave Radiation, Humidity, Total Precipitable Water, Water Vapor, Water Vapor Profiles, Cloud Height, Cloud Top Pressure, Cloud Top Temperature, Cloud Vertical Distribution, Emissivity, Skin Temperature, Sea Surface Temperature, Atmospheric Carbon Monoxide, Pressure Thickness, Tropospheric Ozone, Air Mass/Density
Evaluation of near-surface atmospheric composition reanalysis data in the metropolis of Sao Paulo, Brazil Paiva, Marina S., Franco, Marco A., Rizzo, Luciana V. Atmospheric Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density, Aerosols, Aerosol Extinction, Aerosol Optical Depth/Thickness, Angstrom Exponent, Aerosol Particle Properties, Carbonaceous Aerosols, Dust/Ash/Smoke, Organic Particles, Sulfate Particles, Sulfur Oxides, Sulfur Compounds, Sulfate, Sulfur Dioxide, Sulfur Oxides, Particulate Matter, Dimethyl Sulfide, Black Carbon, Sea Salt, PARTICULATE MATTER (PM 2.5), PARTICULATE MATTER (PM 1.0), PARTICULATE MATTER (PM 10)
A global land daily 10-km-resolution surface ozone dataset from 20132022 Wang, Rui, Shen, Huanfeng, Zeng, Chao, Chen, Jiajia, Wang, Yuan, Li, Yuyu Atmospheric Ozone, Sea Level Pressure, Surface Pressure, Pressure Thickness, U/V Wind Components, U/V Wind Components, Potential Vorticity, Vertical Wind Velocity/Speed, Vertical Profiles, Upper Air Temperature, Air Temperature, Relative Humidity, Specific Humidity, Atmospheric Water Vapor, Cloud Liquid Water/Ice, Cloud Fraction, Altitude, Geopotential Height, Ozone Profiles, Nitrogen Dioxide, Reflectance, Atmospheric Carbon Monoxide, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density
Sensitivity, Uncertainty, Information Content, and Channel Selection for Hyperspectral Reflective Solar Retrievals of Cirrus Cloud Properties Mast, Jeffrey C., Yang, Ping Atmospheric Ozone, Sea Level Pressure, Surface Pressure, Pressure Thickness, U/V Wind Components, U/V Wind Components, Potential Vorticity, Vertical Wind Velocity/Speed, Vertical Profiles, Upper Air Temperature, Air Temperature, Relative Humidity, Specific Humidity, Atmospheric Water Vapor, Cloud Liquid Water/Ice, Cloud Fraction, Altitude, Geopotential Height, Ozone Profiles, Surface Temperature, Skin Temperature, Atmospheric Winds, Surface Winds, Atmospheric Pressure, Total Precipitable Water, Oxygen Compounds, Boundary Layer Winds, Atmospheric Carbon Monoxide, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density
Estimating the effect of air quality on Bike-Sharing usage in Shanghai, China: An instrumental variable approach Ou, Yifu, Bao, Zhikang, Thomas Ng, S., Song, Weize Atmospheric Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density
Very-Short-Term Variations of Sea Surface and Atmospheric Parameters Before the Ms 6.2 Zhangbei (China) Earthquake in 1998 Liu, Yingjia, Wu, Lixin, Qi, Yuan, Ding, Yifan Aerosols, Aerosol Extinction, Aerosol Optical Depth/Thickness, Angstrom Exponent, Aerosol Particle Properties, Carbonaceous Aerosols, Dust/Ash/Smoke, Organic Particles, Sulfate Particles, Sulfur Oxides, Sulfur Compounds, Sulfate, Sulfur Dioxide, Sulfur Oxides, Particulate Matter, Dimethyl Sulfide, Black Carbon, Sea Salt, PARTICULATE MATTER (PM 2.5), PARTICULATE MATTER (PM 1.0), PARTICULATE MATTER (PM 10), Atmospheric Carbon Monoxide, Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Air Mass/Density
Insight into ozone profile climatology over northeast China from aircraft measurement and numerical simulation Wang, Hongyue, Ding, Ke, Huang, Xin, Wang, Wuke, Ding, Aijun Atmospheric Ozone, Sea Level Pressure, Surface Pressure, U/V Wind Components, U/V Wind Components, Potential Vorticity, Vertical Wind Velocity/Speed, Vertical Profiles, Upper Air Temperature, Air Temperature, Relative Humidity, Specific Humidity, Atmospheric Water Vapor, Cloud Liquid Water/Ice, Altitude, Geopotential Height, Ozone Profiles, Atmospheric Carbon Monoxide, Pressure Thickness, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density
Offline Correction of Atmospheric Effects on Single-dish Radio Sawada, Tsuyoshi, Chang, Chin-Shin, Francke, Harold, Gomez, Laura, Mangum, Jeffrey G., Miyamoto, Yusuke, Nakazato, Takeshi, Nishie, Suminori, Phillips, Neil M., Shimajiri, Yoshito, Sugimoto, Kanako Atmospheric Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density, Sea Level Pressure, U/V Wind Components, U/V Wind Components, Potential Vorticity, Vertical Wind Velocity/Speed, Vertical Profiles, Upper Air Temperature, Air Temperature, Relative Humidity, Specific Humidity, Atmospheric Water Vapor, Cloud Liquid Water/Ice, Cloud Fraction, Altitude, Geopotential Height, Ozone Profiles
Improving dust simulations in WRF-Chem v4. 1.3 coupled with the GOCART aerosol module Ukhov, Alexander, Ahmadov, Ravan, Grell, Georg, Stenchikov, Georgiy Dust/Ash/Smoke, Carbonaceous Aerosols, Organic Particles, Sulfate Particles, Sulfur Oxides, Sulfur Compounds, Sulfate, Sulfur Dioxide, Sulfur Oxides, Dimethyl Sulfide, Aerosol Particle Properties, Particulate Matter, Aerosols, Surface Pressure, Pressure Thickness, Relative Humidity, Sea Salt, Black Carbon, Air Mass/Density, Atmospheric Carbon Monoxide, Atmospheric Ozone, Tropospheric Ozone, Carbon Monoxide
A sea level stratospheric ozone intrusion event induced within a thunderstorm gust front Dreessen, Joel Atmospheric Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density, Sea Level Pressure, U/V Wind Components, U/V Wind Components, Potential Vorticity, Vertical Wind Velocity/Speed, Vertical Profiles, Upper Air Temperature, Air Temperature, Relative Humidity, Specific Humidity, Atmospheric Water Vapor, Cloud Liquid Water/Ice, Cloud Fraction, Altitude, Geopotential Height, Ozone Profiles
Multi-model evaluation of meteorological drivers, air pollutants and quantification of emission sources over the upper Brahmaputra basin Saikia, Arshini, Pathak, Binita, Singh, Prashant, Bhuyan, Pradip Kumar, Adhikary, Bhupesh Atmospheric Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density
Multiyear Composite View of Ozone Enhancements and Jaegle, Lyatt, Wood, Robert, Wargan, Krzysztof Atmospheric Carbon Monoxide, Atmospheric Ozone, Pressure Thickness, Surface Pressure, Tropospheric Ozone, Carbon Monoxide, Air Mass/Density, Heat Flux, Air Temperature, Skin Temperature, Specific Humidity, Water Vapor, Precipitation Rate, Snow/Ice, Evaporation, Latent Heat Flux, Latent Heat Flux, Sensible Heat Flux, Diffusion, Surface Winds, Wind Speed, U/V Wind Components, Wind Stress, Wind Stress, Surface Roughness, Planetary Boundary Layer Height, Ice Fraction, Upper Air Temperature, Temperature Tendency, Sea Level Pressure, U/V Wind Components, Potential Vorticity, Vertical Wind Velocity/Speed, Vertical Profiles, Relative Humidity, Atmospheric Water Vapor, Cloud Liquid Water/Ice, Altitude, Geopotential Height, Ozone Profiles, Atmospheric Radiation, Longwave Radiation, Shortwave Radiation, Radiative Flux, Radiative Forcing, Surface Radiative Properties, Albedo, Emissivity, Cloud Properties, Cloud Fraction, Cloud Optical Depth/Thickness, Skin Temperature, Sea Surface Skin Temperature, Surface Temperature, Dew Point Temperature, Cloud Top Temperature, Atmospheric Winds, Surface Winds, Upper Level Winds, Atmospheric Pressure, Cloud Top Pressure, Sea Level Pressure, Total Precipitable Water, Oxygen Compounds, Boundary Layer Winds, Total Ozone
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Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
AIRDENS AIRDENS kg m-3 float32 999999986991104 N/A 1 0
CO CO mol mol-1 float32 999999986991104 N/A 1 0
DELP DELP Pa float32 999999986991104 N/A 1 0
lat lat degrees_north float64 N/A N/A N/A N/A
lev lev layer float64 N/A N/A N/A N/A
lon lon degrees_east float64 N/A N/A N/A N/A
O3 O3 kg kg-1 float32 999999986991104 N/A 1 0
PS PS Pa float32 999999986991104 N/A 1 0
time time minutes since 2001-07-30 00:00:00 int32 N/A N/A N/A N/A
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