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SeaWiFS Level 3 Mapped 9 KM Yearly Photosynthetically Active Radiation (PAR) Data
Entry ID: OBPG_SEAWIFS_L3_M9Y_PAR

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Summary
Abstract: This data set consists of algorithm estimates of global Photosynthetically
Active Radiation (PAR) reaching the surface obtained by the Sea-viewing Wide
Field-of-view Sensor (SeaWiFS), in orbit on the OrbView-2 (formerly SeaStar)
platform. SeaWiFS data products are processed and distributed by the Ocean
Biology Processing Group (OBPG). Processing details can be found at
http://oceancolor.gsfc.nasa.gov/DOCS/SW_proc.html

PAR is defined as the quantum energy flux from the Sun in the spectral range
400-700 nm. It is expressed in Einstein/m2/day. The PAR model uses
plane-parallel theory and assumes that the effects of clouds and clear
atmosphere can be de-coupled. The planetary atmosphere is therefore modeled as
a clear sky atmosphere positioned above a cloud layer. This approach was shown
to be valid by Dedieu et al. (1987) and Frouin and Chertock (1992). For
additional information about the algorithm see
http://oceancolor.gsfc.nasa.gov/DOCS/seawifs_par_wfigs.pdf

The SeaWiFS Level 3 standard mapped image (SMI) products are integer
representations of binned data products. This image is an 8-bit,
two-dimensional array of an Equidistant Cylindrical projection of the globe.
(The capability to produce 16-bit SMI products has been implemented by the
OBPG, and the SeaWiFS PAR products are expected to be regenerated as 16-bits
values at the next reprocessing in about 1 year.) Each SMI product contains
one image of a geophysical parameter and is stored in one physical HDF file.
The Level 3 binned products are used to generate mapped data products on 9 km
equi-rectangular projection. The products are generated for the following
binning periods: Daily, 8-Day, Monthly, Monthly Climatology, Seasonal, Seasonal
Climatology, Annual, Cumulative.

More detailed information on the Level-3 Standard Mapped Image data product
format specifications can be found in the document at
http://oceancolor.gsfc.nasa.gov/DOCS/Ocean_Level-3_SMI_Products.pdf

Browse Level 3 Standard Mapped Images (SMI) at
http://oceancolor.gsfc.nasa.gov/cgi/level3.pl

The SeaWiFS Level 3 Mapped data files are available from the FTP site at
ftp://oceans.gsfc.nasa.gov/SeaWiFS/Mapped/

Related URL
Link: GET DATA
Description: Access SeaWiFS Level 3 Mapped Yearly PAR Data


Link: GET RELATED SERVICE METADATA (SERF)
Description: SeaWiFS Data Analysis System (SeaDAS) for processing, display, analysis, and
quality control of ocean products.


Link: VIEW PROJECT HOME PAGE
Description: SeaWIFS Project


Link: VIEW RELATED INFORMATION
Link: VIEW RELATED INFORMATION
Description: Data and Processing documentation


Parent DIF
This description is a member of a collection. The collection is described in
OBPG_SEAWIFS_L3_MAPPED


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

Temporal Coverage
Start Date: 1997-09-01


Location Keywords
OCEAN > ARCTIC OCEAN
OCEAN > ATLANTIC OCEAN
OCEAN > INDIAN OCEAN
OCEAN > SOUTHERN OCEAN
OCEAN > PACIFIC OCEAN
GEOGRAPHIC REGION > GLOBAL
GEOGRAPHIC REGION > GLOBAL OCEAN
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 9 km
Longitude Resolution: 9 km
Temporal Resolution: Yearly


Science Keywords
OCEANS >OCEAN OPTICS >PHOTOSYNTHETICALLY ACTIVE RADIATION >PAR    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION
OCEANS


Platform
SEASTAR >Orbital Sciences Corporation OrbView-2 Satellite    [Information]


Instrument
SEAWIFS >Sea-Viewing Wide Field-of-View Sensor    [Information]


Project
EOS >Earth Observing System    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
SEAWIFS >Sea-viewing Wide Field-of-view Sensor    [Information]


Quality
For algorithm information on SeaWiFS PAR products performed by the Ocean
Biology Processing Group (OBPG) see
http://oceancolor.gsfc.nasa.gov/DOCS/seawifs_par_wfigs.pdf


Access Constraints
From the start of instrument operations through January 1, 1998, all SeaWiFS
data is free and available to the public. Following January 1, 1998, SeaWiFS
data for scientific research will ONLY be available to Authorized Users who
have registered with the SeaWiFS Project. Any individual scientist who will be
conducting research that employs SeaWiFS data must be a registered Authorized
User. A single Authorized User cannot obtain data to be used anonymously by
members of a research group; all of the members of the group must be Authorized
Users.


Use Constraints
Publications of research results utilizing these data must acknowledge the
SeaWiFS Project and the Ocean Biology Processing Group (OBPG) at the NASA
Goddard Space Flight Center, Greenbelt, MD, USA.


Data Set Progress
IN WORK


Originating Center
OBPG


Data Center
Ocean Biology Processing Group (OBPG), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://oceancolor.gsfc.nasa.gov/

Data Center Personnel
Name: GENE CARL FELDMAN
Phone: (301) 286-9428
Fax: (301) 286-0268
Email: gene.c.feldman at nasa.gov
Contact Address:
Data System Manager
NASA/Goddard Space Flight Center
Mailstop 614.8
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Format: HDF


Personnel
MELANIE F. MEAUX
Role: DIF AUTHOR
Email: gsfc-gcmduso at mail.nasa.gov


GENE CARL FELDMAN
Role: TECHNICAL CONTACT
Phone: (301) 286-9428
Fax: (301) 286-0268
Email: gene.c.feldman at nasa.gov
Contact Address:
Data System Manager
NASA/Goddard Space Flight Center
Mailstop 614.8
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


DR. CHARLES R. MCCLAIN
Role: INVESTIGATOR
Phone: 301-286-5377
Fax: 301-286-0268
Email: Charles.R.McClain at nasa.gov
Contact Address:
NASA/Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Creation and Review Dates
DIF Creation Date: 2005-10-25
Last DIF Revision Date: 2008-05-20



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