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In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun 2011 PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

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Page 1: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

In situ science in support of satellite ocean color objectives

Jeremy Werdell

NASA Goddard Space Flight Center

Science Systems & Applications, Inc.

6 Jun 2011

Page 2: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

outline

the ocean color community; its infrastructure & data archives

satellite data product validation; algorithm development

“status report”

progress within the community; GSFC field work & team

Page 3: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

the ocean color community

U.S. & international academic, research, & government

institutions

NASA Ocean Biology & Biogeochemistry

Program

GSFC Ocean Ecology Branch

Page 4: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

GSFC Ocean Ecology Branch

data processing & distributionSeaDAS

Aquarius & NPP Ocean PEATE

satellite calibration & validationSeaBASS

Ocean Biology Processing Group

field program support office

HPLC analysis team

field & satellite sensor

development

ocean carbon research & laboratory

Page 5: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

NASA Ocean Biology & Biogeochemistry (OBB) Program

field work funded by OBB Program

in situ data submitted to NASA SeaBASS (GSFC) within

1-year

in situ data publicly released

in situ data used to validate satellite data products & to

develop / evaluate algorithms

in situ used to calibrate satellite

Page 6: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

SeaBASS data archive

AOPs, IOPs, carbon stocks, CTD, pigments, aerosols, etc.

continuous & discrete profiles; some fixed observing or along-track

Page 7: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

in situ data in support of operational ocean color “cal/val”

satellite data product validation

satellite vicarious calibration (instrument + algorithm adjustment)

bio-optical algorithm development, tuning, & evaluation

Page 8: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

satellite data product validation: discrete match-ups

Page 9: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

satellite data product validation: discrete match-ups

in situ Chl

Sea

WiF

SChl % Frequency

Page 10: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

satellite vicarious calibration (~ discrete match-ups)

S.W. Bailey, et al. “Sources and assumptions for the vicarious calibration of ocean color satellite observations,” Appl. Opt. 47, 2035-2045 (2008)

Page 11: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

satellite data product validation: population statistics

Chesapeake Bay Program

http://www.chesapeakebay.net

routine data collection since 198412-16 cruises / year

49 stations19 hydrographic measurements

algal biomasswater claritydissolved oxygenothers

Page 12: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

satellite data product validation: population statisticsC

hl-

a (

mg

m-3)

PJW, NASA/SSAI, 27 Apr 2011, @ HPL

P.J. Werdell et al., “Regional and seasonal variability of chlorophyll-a in Chesapeake Bay as observed by SeaWiFS and MODIS-Aqua,” Rem. Sens. Environ. 113, 1319-1330 (2009).

Page 13: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

bio-optical algorithm development

“empirical” “semi-analytical”

Rrs statistically related to pigments, IOPs, carbon stocks, etc.

spectral matching of Rrs & IOPs

Rrs (λ )∝bb (λ )

a(λ ) + bb (λ )

Page 14: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

in situ data in support of operational ocean color “cal/val”

spatial & temporal distributions

“complete” suites of measurements (Rrs, IOPs, biogeochemistry)

Page 15: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

SeaBASS data archive

AOPs, IOPs, carbon stocks, CTD, pigments, aerosols, etc.

continuous & discrete profiles; some fixed observing or along-track

Page 16: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

SeaBASS holdings by year: 2006-2009

2009

2006 2007

2008

Page 17: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

coincident SeaWiFS & in situ data

Page 18: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

coincident SeaWiFS & in situ data

Page 19: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

valid SeaWiFS-in situ match-ups

Page 20: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

bio-optical algorithm development data sets

Rrs & Chl & absorption & backscattering

Rrs Rrs & Chl

Rrs & Chl & absorption

Page 21: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

bio-optical algorithm development data sets

Rrs Rrs & Chl

Page 22: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

bio-optical algorithm data sets

Page 23: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

moving forward: new missions

dynamic range of problem set is growing:

• new missions emphasize research in shallow, optically complex water

• new missions emphasize “new” products (carbon, rates, etc.)

• spectral domain stretching to UV and SWIR• new missions have immediate, operational requirements

Page 24: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

moving forward: community innovations

AERONET (fixed-above water platforms)

buoy networks

gliders, drifters, & other autonomous platforms

longitude

de

pth

latitude

towed & underway sampling

Page 25: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

GSFC Field Program Support & HPLC Analysis

GSFC Ocean Ecology Branch

Joaquin ChavesScott FreemanAimee NeeleyJeremy WerdellSeaBASS TBD

Crystal ThomasTech TBD

Stan HookerChuck McClain Veronica Lance (post-

doc)Antonio ManninoMike Novak

Chuck McClain, Branch Head

Page 26: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

GSFC Field Program Support & HPLC Analysis

capabilities:AOPsIOPsHPLC pigmentsphytoplankton communitiescarbon stocksnutrients

support:1 large field campaign / year2-3 small field campaigns / year1-2 data analysis workshops / year

Page 27: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

questions & comments?

Page 28: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

satellite ocean color

Page 29: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

SEA SURFACE

TOP-OF-THE-ATMOSPHERE

the satellite views the spectral light field at the top-of-the-atmosphere

SATELLITE

PHYTOPLANKTON

1. remove atmosphere from total signal to derive estimate of light field emanating from sea surface (remote-sensing reflectance, Rrs)

2. relate spectral Rrs to Ca (or geophysical product of interest)

3. spatially / temporally bin and remap satellite Ca observations

satellite ocean color

Page 30: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

visible light

wavelength (nm)

near-infraredultra-violet

443412 490510 555 670 765 865

8 SeaWiFS channels

radiance, L, in units of W cm-2 nm-1 sr-1

surface

0o

reflectance, R =

L

incident irradiance, E

satellite ocean color

Page 31: In situ science in support of satellite ocean color objectives Jeremy Werdell NASA Goddard Space Flight Center Science Systems & Applications, Inc. 6 Jun

PJW, NASA/SSAI, 6 Jun 2011, @ UCSB

different water masses, different Lw …

one suite of algorithms?

satellite ocean color