# Presentation: 830812

## The Great Ocean Color Sensor Reprocessing of 2008

- Scope:
- sensors: MODISA, MODIST, SeaWiFS, OCTS, CZCS
- suites: **OC**, PAR, CLCT, FLH, POC, ZEU, IOP, LAND (SST)
*software & analysis by Sep, processing by end of 2008*
- Goals:
- improve absolute accuracy of derived products (L2 & L3)
- reduce instrumental artifacts (temporal & spatial)
- improve agreement between sensors
- update product format & content, filenames, all changes that can’t be made in forward stream (e.g., flags/masks)
- comprehensive product and software documentation

## Change center-band definitions to minimize large and uncertain nLw OOB correction(s). Keep radiances pure.
primarily MODIS 551 -> 547, but we should look at all bands
revise OOB corrections
adjust algorithms as needed (OC3, etc)
also impacts aerosol models

Update band-averaged quantities
Tau-Rayleigh, gaseous absorption crossections
how to integrate (weighting by F0, Lr, etc), which source spectra (Nicolet?)
re-assess band centers

SeaWiFS speckling problem
more straylight masking, outlier rejection in binner

- primarily MODIS 551 -> 547, but we should look at all bands
- revise OOB corrections
- adjust algorithms as needed (OC3, etc)
- also impacts aerosol models
- Update band-averaged quantities
- Tau-Rayleigh, gaseous absorption crossections
- how to integrate (weighting by F0, Lr, etc), which source spectra (Nicolet?)
- re-assess band centers
- SeaWiFS speckling problem
- more straylight masking, outlier rejection in binner

- Major Areas of Effort

## new aerosol models
based on AERONET size distributions
accounting for polarization in the RT
for revised band centers

aerosol model selection
minimum rhoa for selection
alternate selection methods TBD

- based on AERONET size distributions
- accounting for polarization in the RT
- for revised band centers
- aerosol model selection
- minimum rhoa for selection
- alternate selection methods TBD

- Major Areas of Effort

## MODISA instrument calibration
update LUT, vis RVS shape via xcal, NIR RVS, destriping, red bands

MODIST vicarious characterization
redo xcal with final tables, LUT, final NIR VC

SeaWiFS instrument calibration
time & temperature, revised pre-launch cal 

Vicarious cal
update MOBY Lw from source, new filtering technique

- update LUT, vis RVS shape via xcal, NIR RVS, destriping, red bands
- MODIST vicarious characterization
- redo xcal with final tables, LUT, final NIR VC
- SeaWiFS instrument calibration
- time & temperature, revised pre-launch cal
- Vicarious cal
- update MOBY Lw from source, new filtering technique

- Major Areas of Effort

## Can we improve on nLw(NIR) model?
lessons learned from SSR modeling
also applies to CZCS red nLw

f/Q corrections
yes or no
table updates?

Gordon BRDF correction for diffuse transmittance
yes or no

NOMAD-based OC chlorophyll algorithms

- lessons learned from SSR modeling
- also applies to CZCS red nLw
- f/Q corrections
- yes or no
- table updates?
- Gordon BRDF correction for diffuse transmittance
- yes or no
- NOMAD-based OC chlorophyll algorithms

- Major Areas of Effort

## flags & masks
add bad-value meta-data to L2 products, mask in L3
allow negative radiances in binner
update landmask?
revise limits on sensor zenith, solar zenith

analysis methods & presentation
can we improve residual RVS analysis (samples per bin) ?
L3 product validation against in situ
regional time-series approach applied to BATS, HOTS, etc.
normalization of in situ radiances (BRDF, etc.)

comprehensive online documentation (Wiki-based)

- add bad-value meta-data to L2 products, mask in L3
- allow negative radiances in binner
- update landmask?
- revise limits on sensor zenith, solar zenith
- analysis methods & presentation
- can we improve residual RVS analysis (samples per bin) ?
- L3 product validation against in situ
- regional time-series approach applied to BATS, HOTS, etc.
- normalization of in situ radiances (BRDF, etc.)
- comprehensive online documentation (Wiki-based)

- Major Areas of Effort

## CZCS
update vicarious calibration (model-based)
update Lw(670) model (revised Lw(NIR) model)
select appropriate “fixed” aerosol model (from new suite)
reprocess with latest tables, algorithms, flags & masks

OCTS
update vicarious calibration (model-based)
reprocess with latest tables, algorithms, flags & masks

- update vicarious calibration (model-based)
- update Lw(670) model (revised Lw(NIR) model)
- select appropriate “fixed” aerosol model (from new suite)
- reprocess with latest tables, algorithms, flags & masks
- OCTS
- update vicarious calibration (model-based)
- reprocess with latest tables, algorithms, flags & masks

- Legacy Missions

## Slide 8

## Slide 9

## Limiting seawifs/SeaWiFS_RSRs.txt to wavelengths from 380.0 to 1100.0

-    wave avg:     413.9718     443.9682     491.5994     510.0565     555.6612     668.1115     766.9623     863.4672
-    wave pk :     418.0000     446.0000     487.0000     514.0000     558.0000     671.0000     775.0000     858.0000
-    wave cen:     413.3060     443.9443     491.1229     510.0715     554.6308     668.2361     764.8757     866.3526
-    wave wid:      20.1239      19.6079      20.5755      22.3759      18.2935      19.8448      40.2835      41.3658
-          F0:     172.9978     190.1540     196.4376     188.1641     182.9966     151.1389     122.3323      96.2837
-          aw:    4.994E-03    7.512E-03    2.501E-02    4.002E-02    7.708E-02    4.456E-01    2.944E+00    4.865E+00
-         bbw:    3.271E-03    2.421E-03    1.568E-03    1.339E-03    9.393E-04    4.261E-04    2.376E-04    1.489E-04
-         koz:    1.021E-03    3.929E-03    2.540E-02    4.203E-02    9.316E-02    4.673E-02    8.237E-03    3.237E-03
-        kno2:    5.923E-19    4.949E-19    2.661E-19    1.979E-19    8.727E-20    9.510E-21    9.982E-22    1.075E-21
-        taur:    3.136E-01    2.346E-01    1.546E-01    1.329E-01    9.465E-02    4.450E-02    2.550E-02    1.629E-02
- Limiting octs/OCTS_RSRs.txt to wavelengths from 380.0 to 1100.0
-    wave avg:     414.2842     444.1730     490.7473     516.2601     569.6107     669.9725     766.3137     862.3157
-    wave pk :     416.0000     446.0000     492.0000     516.0000     566.0000     666.0000     768.0000     854.0000
-    wave cen:     412.4373     442.8653     490.2424     516.3815     565.1004     667.2609     764.5651     862.4362
-    wave wid:      17.4583      19.8998      22.7553      14.6594      19.1686      21.4361      40.8379      39.3682
-          F0:     172.8918     188.8938     197.4541     183.7087     179.0239     150.2918     122.4980      96.1625
-          aw:    5.125E-03    7.577E-03    1.650E-02    3.791E-02    9.985E-02    4.777E-01    2.865E+00    4.621E+00
-         bbw:    3.275E-03    2.421E-03    1.578E-03    1.273E-03    8.447E-04    4.200E-04    2.373E-04    1.436E-04
-         koz:    1.438E-03    4.272E-03    2.503E-02    4.693E-02    1.106E-01    4.697E-02    8.187E-03    2.825E-03
-        kno2:    5.881E-19    4.954E-19    2.706E-19    1.770E-19    6.808E-20    8.199E-21    8.348E-22    1.133E-22
-        taur:    3.139E-01    2.346E-01    1.555E-01    1.266E-01    8.553E-02    4.391E-02    2.548E-02    1.578E-02
- Limiting modisa/Aqua_RSRs.txt to wavelengths from 380.0 to 1100.0
-    wave avg:     416.3236     442.6168     487.5045     530.1829     547.1592     667.1830     678.5269     745.3243     866.8605
-    wave pk :     416.0000     442.0000     489.0000     530.0000     547.0000     665.0000     677.0000     747.0000     865.0000
-    wave cen:     412.1226     442.2598     487.5085     530.2200     547.3525     665.9702     677.6652     746.9375     867.0496
-    wave wid:      14.4812       9.6908      10.6774      12.0391      10.3886      10.0480      11.3819       9.8298      15.5622
-          F0:     172.9118     187.6217     194.9330     185.7469     186.5385     152.2548     148.0502     128.0925      95.8510
-          aw:    2.030E-02    1.110E-02    1.676E-02    4.494E-02    5.491E-02    4.923E-01    5.116E-01    2.800E+00    4.727E+00
-         bbw:    3.245E-03    2.453E-03    1.621E-03    1.131E-03    9.887E-04    4.265E-04    3.967E-04    2.670E-04    1.404E-04
-         koz:    2.446E-03    3.827E-03    2.246E-02    6.625E-02    8.357E-02    4.854E-02    3.948E-02    1.185E-02    2.625E-03
-        kno2:    5.747E-19    4.955E-19    2.806E-19    1.432E-19    1.131E-19    8.833E-21    7.206E-21    1.471E-21    1.278E-22
-        taur:    3.111E-01    2.376E-01    1.597E-01    1.131E-01    9.945E-02    4.456E-02    4.159E-02    2.851E-02    1.545E-02