cioss ocean optics
DESCRIPTION
CIOSS Ocean Optics. Ocean Optics, Cal/Val Plans, CDR Records for Ocean Color Ricardo M Letelier Oregon State University. Outline - Defining Ocean Color products and their use Cal/Val issues with special emphasis in coastal environments - PowerPoint PPT PresentationTRANSCRIPT
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CIOSS Ocean Optics
Aug 2005
Ocean Optics, Cal/Val Plans, CDR Records for
Ocean Color
Ricardo M LetelierOregon State University
Outline
- Defining Ocean Color products and their use
- Cal/Val issues with special emphasis in coastal environments
- Developing NOAA’s capability for ocean color CDRs Outcome of our first workshop
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CIOSS Ocean Optics
Aug 2005
HES-CW Threshold & Goal Channels and their Applications
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CIOSS Ocean Optics
Aug 2005
Uses for Ocean Color Products • Near real-time observations over regional
scales - for short term forecasting (i.e. human and ecosystem health, navigation hazards) - to study ecosystem response to physical
forcings (i.e. nat. res. management)
• Long term time-series to characterize seasonal, inter-annual and decadal changes (landscape change, ecosystem climate response)
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CIOSS Ocean Optics
Aug 2005
From Gregg et al. 2005:
-Looking at interannual variability in global annual chlorophyll distribution
4% global increase
- Changes are not uniform Increases in coastal areas
-Trend is different that previously observed previously between the 80s and 90s
From Behrenfeld (unpublished)
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CIOSS Ocean Optics
Aug 2005
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CIOSS Ocean Optics
Aug 2005
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CIOSS Ocean Optics
Aug 2005
nLw consistency & In Situ VerificationField Validation: Lwn’s
Temporal Consistency
From NASA / Ocean Color Processing Group
* Lwn: Normalized Water-leaving Radiance
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CIOSS Ocean Optics
Aug 2005
From nLw to ocean color products Reflectance spectrum as a
function of [chl a]
COAS-OSU Direct Broadcast
1 CIOSS postdoc worked on the processing of the Oregon Coast optics and SeaWiFS/MODIS match-up data (2003-2004)
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CIOSS Ocean Optics
Aug 2005
chlFLH empirical(this study)
MODIS chla_2In situ chl
GLOBEC NEP AUGUST 2002
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CIOSS Ocean Optics
Aug 2005
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CIOSS Ocean Optics
Aug 2005
Inverse bio-optics approach using the merging of concurrent remote sensing datasets
From Maritorena & Siegel (2005)
SeaWiFSMODIS Terra/Aqua
In situ Bio-optics
In situ discretesamples
Oregon Datasets
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CIOSS Ocean Optics
Aug 2005
Developing long term Ocean Color Products
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CIOSS Ocean Optics
Aug 2005
A Consistent Ocean Color Time Series Requires Similar:
• Calibration• Algorithms• Spatial and Temporal Resolution (Level-
3)• Data Format• Access• Analysis Tools• Quantification of errors and biases
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CIOSS Ocean Optics
Aug 2005
Information FlowL1A data
Navigate, calibrate (vicarious) L2 algorithms (input ancillary fields of humidity,
ozone, wind speed, surface pressure) Binning in space and time L3 fields
• Satellite/sensor information appended to L1A – Issues regarding preserving geometry, etc. for
VIIRS– Differences between “level” world and IPO
definitions of RDR, SDR, EDR, etc.
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CIOSS Ocean Optics
Aug 2005
Climate Data Records
• Chlorophyll (global) as Thematic Climate Data Record (TCDR)– May be others in the future as
knowledge improves
• nLw as Fundamental Climate Data Record (FCDR)– We require saving these at full
resolution of sensor– Assumes that Level 1A data are
preserved
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CIOSS Ocean Optics
Aug 2005
Chlorophyll as TCDR• Ensuring consistency across multiple platforms
– Challenging in NPOESS era given launch-on-failure strategy• Sensor overlap greatly facilitates creation of consistent data records
• Sensor pre-launch & on-orbit characterization– Looking at the Moon– Need access to solar diffuser data
• Defining resolution scales• In situ data
– Vicarious calibration– Validation
• Intercalibration of in situ sensors– Need more than one sites?
• Archive services– Documentation– Data access and Formats
• Processing & reprocessing– Need science-focused processing system
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CIOSS Ocean Optics
Aug 2005
Normalized Water-leaving Radiances (nLw) as FCDR
• Ancillary data fields– Documentation on models– Versions of fields– Current version of vicarious calibration– Ocean Color Project experience
• Ensembles of tables, input fields, etc.
• Validation– Need SeaBASS-like system for in situ
data
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CIOSS Ocean Optics
Aug 2005
Roles and Responsibilities
• There is a continuing need for NASA involvement, given its extensive experience in ocean color and its focus on scientific research
• NOAA needs to begin to develop its own capacity to produce CDRs
• Next step will be a workshop focusing on the end-to-end processes needed to meet the science requirements for ocean color CDRs– Workshop will be held on the East Coast to
ensure involvement from NASA and NOAA
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CIOSS Ocean Optics
Aug 2005
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CIOSS Ocean Optics
Aug 2005