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MODIS/Aqua Level 3 Global Mapped 9 KM Monthly Calcite Data
Entry ID: OBPG_MODIS_AQUA_L3_M9CLCTM


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Summary
Abstract: This data set consists of global ocean calcite (CLCT) data derived from the
Moderate Resolution Imaging Spectroradiometer (MODIS), in orbit on the Aqua
(formerly EOS PM) platform. MODIS ocean products are processed and
distributed by the Ocean Biology Processing Group (OBPG). Processing details
can be found at http://oceancolor.gsfc.nasa.gov/DOCS/MODISA_processing.html

Coccolithophores are small marine phytoplankton which form external CaCO3
scales (diameter ~ a few m and thickness 250 to 750 nm) called coccoliths. The
coccoliths can form multiple layers and eventually detach. Coccolithophores are
the largest source of calcium carbonate on earth [Westbroek et al., 1985].
Dissolution of calcite depends on the depth of the calcite compensation depth.
Globally, calcium carbonate is responsible for about 75% of the deposition of
carbon on the sea floor having a marine origin [Groom and Holligan, 1987;
Honjo, 1986; Honjo, 1990], and exceeds organic burial by a factor of seven.
Thus, coccolith production is an important part of the biogenic carbon cycle.

A global-scale study of their distribution is an important application for
MODIS imagery. MODIS is ideal for such a study because of two unique
characteristics: first its high radiometric sensitivity should, in principle,
allow the detection of smaller quantities of coccoliths than CZCS; and second,
the existence of the land bands on MODIS, e.g., band 3 and 4, with their high
saturation radiance will enable study of very high concentrations of coccoliths
that would saturate a typical ocean color instrument. The Aqua MODIS Level-3
calcite products are generated routinely for daily, 8-day, monthly, seasonal
and annual time periods. Spatial resolutions of 4 and 9 km are available.

The algorithm for extracting the detached coccolith concentration from surface
waters is based on the semianalytic model of ocean color of Gordon et al.
[1988]. Briefly, the model relates the normalized water-leaving radiance, i.e.,
the radiance that would exit the ocean if the sun were at the zenith and the
atmosphere were removed [Gordon and Clark, 1981], to the absorption and
scattering properties of the constituents of the water using radiative transfer
theory. The absorption and scattering properties are then related to the
constituent concentrations through statistical analysis of direct measurements.
Therefore, they represent oceanic- or regional-averaged relationships.

For more detailed information, see the Algorithm Theoretical Basis Document
(ATBD) for MODIS Detached Coccolith Concentration
http://modis.gsfc.nasa.gov/data/atbd/atbd_mod23.pdf

The Aqua MODIS Level 3 Calcite (CLCT) data files are available from the FTP
site at ftp://oceans.gsfc.nasa.gov/MODISA/L3SMI/

Related URL
Link: GET DATA
Description: Access Daily Aqua-MODIS Level 3 Calcite (CLCT) 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: MODIS WEB


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


Parent DIF
This data set description is a member of a collection. The collection is described in
MODIS_OCEAN_PARENT


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

Temporal Coverage
Start Date: 2002-07-04


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


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


Science Keywords
OCEANS >OCEAN CHEMISTRY >BIOGEOCHEMICAL CYCLES    [Definition]
BIOLOGICAL CLASSIFICATION >ANIMALS/INVERTEBRATES    [Definition]
BIOLOGICAL CLASSIFICATION >PROTISTS >FLAGELLATES >HAPTOPHYTES >COCCOLITHOPHORES    [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS >MICROALGAE >HAPTOPHYTES >COCCOLITHOPHORES
BIOSPHERE >AQUATIC ECOSYSTEMS >PLANKTON >PHYTOPLANKTON    [Definition]


ISO Topic Category
BIOTA
OCEANS


Platform
AQUA >Earth Observing System, AQUA    [Information]


Instrument
MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]


Project
EOS >Earth Observing System    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]


Access Constraints
None


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


Keywords
CALCITE
CALCIUM CARBONATE


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: 2004-05-21
Last DIF Revision Date: 2006-04-11


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