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MODIS/Terra Aerosol 5-Min L2 Swath 10km V5.1
Entry ID: MOD04_L2


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/


Purpose: Science Research

Related URL
Link: View Related Information
Description: Overview of MODIS


Link: View Related Information
Description: Search and order products from LAADS website.


Link: View Related Information
Description: Direct access to the ftp site and directory hosting the MOD04_L2 5.1 data set.


Link: View Related Information
Description: MODIS Science Team


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

Data Set Citation
Version: 5.1


Temporal Coverage
Start Date: 1999-12-18


Data Resolution
Temporal Resolution: 5 minutes


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
ENVIRONMENT
HEALTH


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


Instrument
MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
Terra >Earth Observing System (EOS), TERRA    [Information]


Quality
See http://modaps.nascom.nasa.gov/services/qa/


Use Constraints
None


Data Set Progress
IN WORK


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/



Creation and Review Dates
DIF Creation Date: 2011-11-22
Last DIF Revision Date: 2016-03-02



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