MODIS/Terra Aerosol 5-Min L2 Swath 10km (Collection 004 and 005)
Entry ID: MOD04_L2

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Summary
Abstract: MODIS was launched aboard the Terra satellite on December 18, 1999
(10:30 am equator crossing time) as part of NASA's Earth Observing
System (EOS) mission. MODIS with its 2330 km viewing swath width
provides almost daily global coverage. It acquires data in 36 high
spectral resolution bands between 0.415 to 14.235 micron with spatial
resolutions of 250m(2 bands), 500m(5 bands),and 1000m (29
bands). MODIS sensor counts, calibrated radiances, geolocation
products and all derived geophysical atmospheric and ocean products
are archived at NASA Goddard DAAC and has been made available to
public since April 2000.

The MODIS level-2 atmospheric aerosol product provides retrieved
ambient aerosol optical properties (e.g., optical thickness and size
distribution), mass concentration, look-up table derived reflected and
transmitted fluxes, as well as quality assurance and other ancillary
parameters, globally over ocean and near globally over land.

The shortname for this level-2 MODIS aerosol product is MOD04_L2 and
the principal investigators for this product are MODIS scientists:
Dr. Yoram Kaufman for aerosol retrieval over land, and Dr. Didier
Tanre (didier.tanre@univ-lille1.fr) for aerosol retrieval over ocean.
The MODIS aerosol product (MOD04_L2) contains global data that has a
spatial resolution of 10-km (at nadir). Each MOD04_L2 product file
covers a five-minute time interval. The output grid is 135 pixels in
width by 203 pixels in length. Every tenth file has an output grid
size of 135 by 204 pixels. MOD04_L2 product files are stored in
Hierarchical Data Format (HDF-EOS). The file consists of 53 pixel
level gridded aerosol parameters. These pixel level gridded aerosol
parameters are stored as Scientific Data Sets(SDS) within the
file. Each file is roughly 10.46 MB in size, and the total data volume
is approximately 1.44 GB/day.

MODIS Data Category & Parameters

Spatial & Temporal Resolution:
latitude,longitude
scan start time

Solar and Sensor Viewing Geometry:
solar zenith angle, solar azimuth angle
sensor zenith angle, sensor azimuth angle

Aerosol Parameters for Land & Ocean (Combined)
aerosol optical depth (0.55 micron) over land and ocean
scattering angle

Aerosol Parameters from Ocean Retrieval Algorithm (best/average
retrieval)
Aerosol Particle Properties:
effective optical depth at 7 bands (0.47,0.55,0.66,0.87,1.24,1.64,2.13
micron)
effective radius (based on 0.55 micron)
optical depth for small & large particles
ratio of small mode optical depth relative to total for 0.55 micron
mass concentration & cloud condensation nuclei (based on 0.55 micron)
Angstrom exponents 1 (based on 0.55 and 0.865 micron)
Angstrom exponent 2 (based on 0.865 and 2.13 micron)
asymmetry factor & back scattering ratio at 7 bands
solution indices for small & large modes


Aerosol Parameters from Land Retrieval Algorithm:

aerosol type, continental optical depth
corrected optical depth, mass concentration;
Angstrom exponent and dust weighting factor


Aerosol Derived Radiation Parameters from both Algorithms (Land & Ocean):
reflected flux, transmitted flux
mean reflectance & uncertainty

Quality Assurance & Statistical Parameters from both Algorithms(land &
Ocean) :
quality assurance flag, cloud mask, cloud fraction,
number of pixels used, least square error

These aerosol parameters will be used to study aerosol climatology,
sources and sinks of specific aerosol types (e.g. sulfates and biomass
burning aerosol), interaction of aerosols with clouds, and atmospheric
corrections of remotely sensed surface reflectance over the land. This
product will also be used to monitor aerosol mass concentration,
aerosol optical properties, and radiative forcing on a global scale.

See the MODIS Science Team homepage for more data set
information: http://modis.gsfc.nasa.gov/data/dataprod/
or
visit the MODIS Atmosphere Team homepage:
http://modis-atmos.gsfc.nasa.gov/MOD04_L2/

Related URL
Link: GET DATA > LAADS
Description: Access Collection 4 MOD04_L2 directly though the LAADS FTP site


Link: GET DATA > LAADS
Description: Access Collection 5 MOD04_L2 directly though the LAADS FTP site


Link: GET DATA > LAADS
Description: Web site for MODIS Collection 5 L1B, Geo and atmosphere data ordering.
Web site for MODIS Collection 4 atmosphere data ordering


Link: GET DATA > LANCE
Description: Near real-time (NRT) data are available from MODAPS for certain Aqua and Terra MODIS L0, L1, L2, L2G, and L3 products. Whereas the standard MODIS forward processing acquires 2-hour L0 files for Aqua and Terra from EDOS within 7-8 hours of real time, LANCE-MODIS acquires session-based L0 files from EDOS and the end of the session is available within 10-30 minutes after real time.


Link: GET DATA > ECHO
Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record.


Link: VIEW PROJECT HOME PAGE
Description: View data set description.


Link: VIEW PROJECT HOME PAGE
Description: MODIS Science Team


Link: VIEW PROJECT HOME PAGE
Description: MODIS Atmosphere Team


Link: VIEW PROJECT HOME PAGE
Description: MODIS Characterization Support Team (MCST)


Link: VIEW RELATED INFORMATION
Description: Readme regarding accessing MODIS data from the LAADS FTP server.


Link: VIEW RELATED INFORMATION
Description: View MODIS data availability.


Link: VIEW RELATED INFORMATION
Description: Web site for MODIS Collection 4 L1B and Geo data ordering.


Link: VIEW RELATED INFORMATION
Description: Sample and Browse Images for MODIS (MOD04_L2) Aerosol Products


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Title: MODIS/Terra Aerosol 5-Min L2 Swath 10km
Version: Collection 004 and 005
Online Resource: http://modis-atmos.gsfc.nasa.gov/MOD04_L2/


Temporal Coverage
Start Date: 2001-03-06


Location Keywords
GEOGRAPHIC REGION > GLOBAL


Data Resolution
Latitude Resolution: 10 km
Longitude Resolution: 10 km
Temporal Resolution: 5-minute


Science Keywords
ATMOSPHERE >AEROSOLS >AEROSOL BACKSCATTER    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL EXTINCTION    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL PARTICLE PROPERTIES    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL RADIANCE    [Definition]
ATMOSPHERE >AEROSOLS >CARBONACEOUS AEROSOLS    [Definition]
ATMOSPHERE >AEROSOLS >CLOUD CONDENSATION NUCLEI    [Definition]
ATMOSPHERE >AEROSOLS >DUST/ASH/SMOKE    [Definition]
ATMOSPHERE >AEROSOLS >NITRATE PARTICLES    [Definition]
ATMOSPHERE >AEROSOLS >ORGANIC PARTICLES    [Definition]
ATMOSPHERE >AEROSOLS >PARTICULATE MATTER    [Definition]
ATMOSPHERE >AEROSOLS >SULFATE PARTICLES    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >RADIATIVE FLUX    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >REFLECTANCE    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL OPTICAL DEPTH/THICKNESS >ANGSTROM EXPONENT    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
TERRA >Earth Observing System, TERRA (AM-1)    [Information]


Instrument
MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]


Project
DODS >Distributed Oceanographic Data System    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
TERRA >Earth Observing System (EOS), TERRA    [Information]
OPENDAP >Open-source Project for a Network Data Access Protocol    [Information]


Quality
The 'version 004' or 'collection 004' product is better than 'version
003' and earlier versions. The quality of this version 004 product is
established as 'Validated' . This means its accuracy has been
assessed over a widely distributed set of locations and time periods
via several ground-truth and validation efforts. Results are peer-reviewed
and published at scientific conferences and workshops.For the latest
information please see:
http://modis-atmos.gsfc.nasa.gov/products_calendar_overview.html.


Access Constraints
Available to public to gain familiarity with the data format and
parameters.


Use Constraints
This Data set (version 004/collection 004) is of 'Validated'
Quality. This data is appropriate for use in scientific publications.
Before using it in any publication please the contact science team
representative for the known problems and updates.


Keywords
AEROSOL INDEX
AEROSOL OPTICAL DEPTH
AEROSOL OPTICAL THICKNESS
AEROSOL TYPE
AIR MONITORING
ANGSTROM COEFFICIENT
ASYMMETRY FACTOR
ATMOSPHERIC CORRECTION
ATMOSPHERIC MODELS
BACKSCATTERING RATIO
DESERT DUST
EFFECTIVE OPTICAL DEPTH
EFFECTIVE RADIUS
EMISSIONS
HAZE
MASS CONCENTRATION
MIE PARTICLES
MOD04
MOD04_L2
PARTICULATE
POLLUTANTS
RADIATION BUDGET
RADIATIVE COOLING
RADIATIVE TRANSFER MODELS
REFELCTED FLUX
SCATTERING ANGLE
SEA SALT
SMOG
SPECTRAL OPTICAL DEPTH
STRATOSPHERIC AEROSOL
SURFACE REFLECTANCE
TOTAL COLUMN OPTICAL THICKNESS
TRANSMITTED FLUX
TROPOSPHERIC AEROSOL
TURBIDITY
VISIBILITY
VOLCANIC AEROSOL. OPeNDAP
EOSDIS
Near Real Time (NRT)
LANCE


Data Center
L1 and Atmosphere Archive and Distribution System,Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://ladsweb.nascom.nasa.gov/
Dataset ID: MOD04_L2 Collection 004 and 005

Data Center Personnel
Name: LAADS USER SUPPORT TEAM
Phone: 301-731-2917, 1-866-506-6347 (toll-free - US only)
Fax: 301-577-6622
Email: modapsuso at sigmaspace.com
Contact Address:
LAADS User Support Team
4801 Forbes Boulevard
City: Lanham
Province or State: MD
Postal Code: 20706
Country: USA



Distribution
Distribution_Media: Online (FTP)
Distribution_Size: 15 GB
Distribution_Format: HDF
Fees: None


Personnel
GANG YE, PH.D
Role: DIF AUTHOR
Phone: 301-352-2109
Email: gang.ye at sigmaspace.com


LAADS USER SUPPORT TEAM
Role: TECHNICAL CONTACT
Phone: 301-731-2917, 1-866-506-6347 (toll-free - US only)
Fax: 301-577-6622
Email: modapsuso at sigmaspace.com
Contact Address:
LAADS User Support Team
4801 Forbes Boulevard
City: Lanham
Province or State: MD
Postal Code: 20706
Country: USA


YORAM, DR. J. KAUFMAN
Role: INVESTIGATOR


DIDIER,DR. TANRE
Role: INVESTIGATOR
Phone: 33 (0) 320337033
Fax: 33 (0)3 20 43 43 42
Email: tanre at loa.univ-lille1.fr
Contact Address:
Laboratorie d'Optique Atmospherique
Bat. P5, U.S.T. deLille
Villeneuve d'Ascq Cedex
Postal Code: 59655
Country: FRANCE


Publications/References
Chu, D. A., K. Strabala, S. Platnick, E. Moody, M. King, S. Mattoo,
R. Hucek, and B. Ridgway, 2000: MODIS Atmosphere QA Plan. Version 2.2
,NASA Goddard Space Flight Center, 46 pp.

Chu, D. A., Y. J. Kaufman, L. A. Remer, and B. N. Holben,1998: Remote
sensing of smoke from MODIS Airborne Simulator during SCAR-B
experiment. Journal of Geophysical Research, 103, 31979-31988.

Gao, B.-C., and Y. J. Kaufman, 1995: Selection of the 1.375-m
MODIS channelfor remote sensing of cirrus clouds and stratospheric
aerosols from space, J. Atm. Sci., 52, 4231-4237.

Kaufman, Y. J., and D. Tanre,1998: Algorithm For Remote Sensing of
Tropospheric Aerosol from MODIS,Algorithm Theoretical Basis Document,
ATBD-MOD-02, NASA Goddard Space Flight Center,85 pp.

Kaufman, Y. J., and D. Tanre,1997: MODIS Aerosol Product, in MTPE EOS
Data Products Handbook,107-108.

Kaufman, Y. J., and R. S. Fraser, 1997: The effect of smoke particles
on cloudsand climate forcing. Science, 277, 1636-1639.

Kaufman, Y. J., D. Tanre, L. Remer, E. F.Vermote, A. Chu, &
B. N. Holben, 1997: Operational remote sensing of tropospheric aerosol
over the land from EOS-MODIS. Journal of Geophysical Research,
102(14), 17051-17068.

King, M., Y. Kaufman, P. Menzel, D.Tanre, B. Gao, 1999: MODIS
Atmosphere Validation Plan, NASA Goddard Space Flight Center, 48 pp.

King, M. D., W. P. Menzel, P. S. Grant, J. S. Myers, G. T. Arnold,
S. E. Platnick, L. E.Gumley, S. C. Tsay, C. C. Moeller,
M. Fitzgerald, K. S. Brown and F. G.Osterwisch, 1996: Airborne
scanning spectrometer for remote sensing of cloud, aerosol, water
vapor and surface properties. J. Atmos. Oceanic Technol.,13,
777–794.

Remer, L. A., Y. J. Kaufman, and B. N. Holben, 1996: The size
distribution of ambient aerosol particles: Smoke vs. urban/industrial
aerosol. Global biomass burning. Cambridge MA: MIT Press.

Tanre, D., Y. J. Kaufman, M. Herman, and S. Mattoo, 1997: Remote
sensing of aerosol properties over oceans using the MODIS/EOS spectral
radiances. Journal of Geophysical Research, 102, 16971-16988.

Tanre, D., M. Herman, and Y. J. Kaufman, 1996: Information on aerosol
size distribution contained in solar reflected radiances. Journal of
Geophysical Research-Atmospheres, 101, 19043-19060.

Creation and Review Dates
DIF Creation Date: 2003-04-03
Last DIF Revision Date: 2013-06-10

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