Satellite Ocean Color Products: What should be produced? ZhongPing Lee, Bryan Franz, Norman Kuring, Sean Baily raise questions, rather to provide definite.

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Presentation transcript:

Satellite Ocean Color Products: What should be produced? ZhongPing Lee, Bryan Franz, Norman Kuring, Sean Baily raise questions, rather to provide definite answers

How do we determine what OC products to (“should”) be generated at NASA? or Does it matter if we produce 10’s of products from ~6 bands of measurements, as now processors are fast and data storage device is cheap?

“Toy”, to server citizens/people MODIS/VIIRS/…

To meet demand or address scientific questions: NASA: “Everything” – Chl/PIC/POC/DOC/phyto. species … S1: What are there and how much? S2: How do they contribute/affect BGC processes? Navy (Pers. Comm.): Chl/SPM/visibility Citizens: clarity/pollution/seafood … EPA (Pers. Comm.): Chl (in particular for nearshore and inland waters)/pollutants NOAA (Pers. Comm.): Chl/phyto. bloom/information for shelf-habitat and sanctuaries/clarity(IOPs, Kd)/glint image; information for fisheries/oil detection Climate-change researchers: Everything/anomalies

1.R rs ( ) 2.Ångstrom 3.AOT 4.Chlorophyll a 5.K d (490) 6.POC 7.PIC 8.CDOM_index 9.PAR 10.iPAR 11.nFLH Level-2 OC Product Spectral water-leaving reflectance and derived aerosol optical properties = 412, 443, 469, 488, 531, 547, 555, 645, 667, 678 Phytoplankton chlorophyll concentration Marine diffuse attenuation at 490nm Particulate organic carbon concentration Particulate inorganic carbon concentration Colored dissolved organic matter index Daily mean photosynthetically available radiation Instantaneous photosynthetically available radiation Chlorophyll fluorescence line height Name and Algorithm Reference What are produced now ( “standard” products):

Evaluation Products Produced at Level-3 only (from daily binned Rrs) 6 ProductsAlgorithm Chl, a dg (443), b bp (443)Maritorena (GSM) IOPs (a(443), a ph (443), a dg (443), b bp (443))Lee (QAA) K d (412),K d (443),K d (490)Lee ZeuLee ZeuMorel K PAR Morel

1.R rs ( ) 2.Ångstrom 3.AOT 4.Chlorophyll a 5.K d (490) 6.POC 7.PIC 8.CDOM_index 9.PAR 10.iPAR 11.nFLH calibration updates, ancillary data updates, improved land/water masking, terrain height, other minor fixes = 412, 443, 469, 488, 531, 547, 555, 645, 667, 678 new algorithm (Hu et al. 2012) coefficient update no change updated algorithm and LUT remove product (redundant with new IOP suite) consolidated algorithm, minor fixes no change flagging changes (allow negatives) Name and/or Algorithm Updates/Changes 12. IOPs suite of inherent optical property products (Werdell et al. 2013) Planned Changes to OC Standard Product Suite Level-2 OC Product

Expanded Product Suite - IOPs 8 proposed IOP product suite a( )total absorption at all visible wavelengths b b ( )total backscatter at all visible wavelengths a ph ( )phytoplankton absorption at all vis. wavelengths a dg (443) absorption due to colored-detritus at 443nm S dg exponential spectral slope for a dg b bp (443)particle backscattering at 443nm S bp power-law spectral slope for b bp uncertainties uncertainties in a dg, a ph, b bp at 443nm rationale provides total a and b b for input to IOP-based derived product algorithms (e.g., Lee et al. spectral K d, euphotic depth) provides sufficient information to compute full spectral component absorption and scattering coefficients and uncertainties VIIRS = 410, 443, 486, 551, 671 MODIS = 412, 443, 469, 488, 531, 547, 555, 645, 667, 678

It appears we have everything, then what is the problem … An AOP product is the same as a phyto. pigment product … If two products have a correlation coefficient as 1.0, should we produce these two “independent” products?

K d (PAR) Again, no independent information regarding the ocean system

K d (PAR) is fundamentally vague …

Many optical properties (a, b b, K d ) are spectral, Q1: Do we generate products at one or all bands? TA1: Rule of thumb – try our best to produce products with spectrally (spatially) independent information a( )total absorption at all visible wavelengths a ph ( )phytoplankton absorption at all visible wavelengths Actually only two independent products: M ph and M dg GIOP: TA1b: Generate a(λ) and a ph (λ) without assumptions regarding their spectral shapes/dependences. Planed IOP suite:

Statistics on downloading OC products (Apr. 6 – May 6, 2015) L3 BIN FilesL3 SMI Files IP Daily8 DayMonthlyOtherDaily8 DayMonthlyOther PAR Chl Kd PIC POC IOP Q2: How to promote the use of more robust products? TA2: Name IOP products as something more familiar with endusers; Or No longer generate “fake” Chl or POC products, “force” users to do the conversion.

USR d (z)/USR(0 - ) K d (USR) [m -1 ] PAR d (z)/PAR(0 - ) K d (PAR) [m -1 ] (Lee et al 2013) PAR: nm USR: nm Stop producing K d (PAR)

TA4: Produce water-quality classes (Good, So-so, Bad) Or easy-to-understand products See the front? See your toe? Q3: How to maximize the value provided by OC satellites? Should NASA also generate some products for all citizens?

TA5: Separate the wavelength conversion and product retrieval into two independent modules, then one set of algorithms for all satellites Q4: How to achieve consistent OC products across satellites? multiple sets of algorithms?? Q5: Should we provide smaller number but more robust products or more but less robust products? e.g., oil, floating algae, SPM, phyto. bloom, pCO2, salinity, … TA6: ???

Questions/discussions …

Current VIIRS OC Standard Product Suite 1.R rs ( ) 2.Ångstrom 3.AOT 4.Chlorophyll a 5.K d (490) 6.POC 7.PIC 8. 9.PAR Level-2 OC Product Spectral water-leaving reflectance and derived aerosol optical properties = 410, 443, 486, 551, 671 Phytoplankton chlorophyll concentration Marine diffuse attenuation at 490nm Particulate organic carbon concentration Particulate inorganic carbon concentration Daily mean photosynthetically available radiation Algorithm Reference 12. IOPs suite of additional inherent optical property products (Werdell et al. 2013)

Chl POC