Advances in Phytoplankton Pigment Mapping in Spanish ... · Advances in Phytoplankton Pigment...

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Advances Advances in in Phytoplankton Phytoplankton Pigment Pigment Mapping Mapping in in Spanish Spanish Reservoirs Reservoirs Pe Pe ñ ñ a a - - Mart Mart í í nez nez , Ram , Ram ó ó n n , , Ruiz Ruiz - - Verd Verd ú ú , Antonio , Antonio , , Dom Dom í í nguez nguez - - G G ó ó mez mez , Jos , Jos é é Antonio Antonio Centro de Estudios Hidrogr Centro de Estudios Hidrogr á á ficos del CEDEX. SPAIN ficos del CEDEX. SPAIN

Transcript of Advances in Phytoplankton Pigment Mapping in Spanish ... · Advances in Phytoplankton Pigment...

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 11111111

AdvancesAdvances in in PhytoplanktonPhytoplankton PigmentPigment

MappingMapping in in SpanishSpanish ReservoirsReservoirs

PePeññaa--MartMartííneznez, Ram, Ramóónn, , RuizRuiz--VerdVerdúú, Antonio, Antonio, ,

DomDomííngueznguez--GGóómezmez, Jos, Joséé AntonioAntonio

Centro de Estudios HidrogrCentro de Estudios Hidrográáficos del CEDEX. SPAINficos del CEDEX. SPAIN

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 22222222

Summary and results

ESA Project AO-594

“Development of an Operational System for direct Thematic

Mapping of Photosynthetic Pigments in Lakes using MERIS.

Application to the Spanish reservoirs”.

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INITIAL OBJECTIVES

• Developing models for the retrieval of photosynthetic

pigment concentrations in Spanish reservoirs using MERIS

• Thematic mapping for water quality monitoring

� Eutrophication assessment

� Harmful algal bloom detection

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WHY REMOTE SENSING?

•More than 1,300 reservoirs in Spain

• Scarcely studied

• Previous experience with Landsat and airborne sensors

E. de Guadalhorce

E. de Guadalteba

E. de Conde de Guadalhorce

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WHY MERIS?

• Adecquate bands for phytoplankton mapping

• Good spatial coverage and temporal resolution

• Spatial resolution good enough for the 120 biggest

reservoirs

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LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 77777777

MODEL DEVELOPMENT

1. LIMITATIONS AND CONSTRAINTS:

• Small group. No background in optical measurements

• Difficulties for obtaining reliable measurements of IOP’s

• No previous database of AOP’s and pigment data (big

effort in sampling campaigns)

• Spanish Reservoir characteristics

� wide range of chlorophyll-a concentrations (0–700 mg m-3)

� Low CDOM (rapid turnover and mineralisaton)

� Variable SM concentrations (normally low in big reservoirs)

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 88888888

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 99999999

MODEL DEVELOPMENT

2. ACHIEVEMENTS:

• Empirical model for chlorophyll-a

� Based on the ratio of MERIS bands 9 and 7

� Acceptable accuracy for eutrophication monitoring

• Empirical model for phycocyanin (cyanobacterial marker)

� Based on the ratio of MERIS bands 9 and 6

� Acceptable accuracy for bloom monitoring

• Ongoing validation of semi-analytical model for

phycocyanin (Simis et alli, L&O 2005)

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 1010101010101010

Development of an empirical model for chl-a

y = 21,137x2 + 10,445x - 9,6838

R2 = 0,9158

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a (m

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-3)

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Development of an empirical model for chl-a

y = 21,137x2 + 10,445x - 9,6838

R2 = 0,9158

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validation with field data

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chl-a predicted

ch

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dRMSE = 22.24

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validation with field data

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Development of an empirical model for phycocyanin

y = 200,63x - 131,86

R2 = 0,842

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validation with field data

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PC predicted

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VALIDATION OF MODELS IN MERIS IMAGERY

1. LIMITATIONS AND CONSTRAINTS:

• Lack of a reliable atmospheric correction

� Current approach based on ATCOR (not fully

satisfactory)

•Water masking

� Based on the ratio of MERIS bands 14 and 5

� Very good results

• Adjacency effects (minimised after water masking)

• Difficulties for getting match-ups

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VALIDATION OF MODELS IN MERIS IMAGERY

2. ACHIEVEMENTS:

• Up to 50 images processed (2003-2005)

• Pending validation, but already useful:

� In the developing of a web-based monitoring system

� For detecting temporal trends (e.g. Evaluation of the

effects of the current drought in water quality)

• Validation with CHRIS/Proba in Rosarito reservoir

� Up to 12 images in 2004

� Good model performance (results presented this year in

CHRIS/Proba workshop)

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Examples of thematic maps

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Enlarged area

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ValdecaValdecaññasas reservoirreservoir. 18. 18--0606--20032003

Mapa de Concentración de Clorofila-a

Mapa de Concentración de Ficocianina

0 20 40 60 80 100 120 140 160 180 200 220 240 >255 mg·m-3

20

ChlorophyllChlorophyll--a a concentrationconcentration mapmap

PhycocyaninPhycocyanin concentrationconcentration mapmap

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 2121212121212121

SantillanaSantillana reservoirreservoir. 09. 09--0404--20042004

21

ChlorophyllChlorophyll--a a concentrationconcentration mapmap

PhycocyaninPhycocyanin concentrationconcentration mapmap

0 20 40 60 80 100 120 140 160 180 200 220 240 >255 mg·m-3

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 2222222222222222

NavalcNavalcáánn reservoirreservoir. 30. 30-- 0101--20052005

Mapa de Concentración de Clorofila-a

Mapa de Concentración de Ficocianina

ChlorophyllChlorophyll--a a concentrationconcentration mapmap

PhycocyaninPhycocyanin concentrationconcentration mapmap

0 20 40 60 80 100 120 140 160 180 200 220 240 >255 mg·m-3

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 2323232323232323

Water quality monitoring reports

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EMBALSE DE ALMENDRA 24.08.04

Datos del embalse-Volumen de agua embalsada:

- 2404 hm3 (93,0%)

X0,7910,842,118.06.04

X0,7722,761,810.07.04

X0,8114,323,824.08.04

Todas

Tran

sparen

cia

Ficocian

ina

Clorofila a

Variable

Fecha

MAPAS TEMÁTICOS OBTENIDOS MEDIANTE

TELEDETECCIÓN ESPACIAL

Otros datos del embalseOtros datos limnológicosOtros vínculos

Sensor: Sensor: MERISMERIS

OPERATIONAL SYSTEM TO PRODUCE AND TRANSFER THEMATIC OPERATIONAL SYSTEM TO PRODUCE AND TRANSFER THEMATIC MAPS FROM MERIS IMAGERY TO WATER MANAGEMENT AND MAPS FROM MERIS IMAGERY TO WATER MANAGEMENT AND

PUBLIC INFORMATION PUBLIC INFORMATION

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EMBALSE DE ALMENDRA 24.08.04

Concentración de ficocianina:- Media: 14,3- Máxima: 55,3- Mínima: 11,2

Datos del embalse-Volumen de agua embalsada:

- 2404 hm3 (93,0%)

GRÁFICO DE EVOLUCIÓN

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X0,7910,842,118.06.04

X0,7722,761,810.07.04

X0,8114,323,824.08.04

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Variable

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MAPAS TEMÁTICOS OBTENIDOS MEDIANTE

TELEDETECCIÓN ESPACIAL

Otros datos del embalseOtros datos limnológicosOtros vínculos

Sensor: Sensor: MERISMERIS

G RÁF IC O DE E V O L UC IÓ N

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[FIC

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Monitoring of drought effects on eutrophication

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Alcántara 1 y 2

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Clorofila a (mg/m

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Alcántara

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91,93

63,9166,69

69,4672,37

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USE OF CHRISUSE OF CHRISUSE OF CHRIS---PROBA IMAGERY FOR PROBA IMAGERY FOR PROBA IMAGERY FOR IMPROVING MERIS PIGMENT FITS IN IMPROVING MERIS PIGMENT FITS IN IMPROVING MERIS PIGMENT FITS IN

ROSARITOROSARITOROSARITO RESERVOIR (2004)RESERVOIR (2004)RESERVOIR (2004)

OBJECTIVESOBJECTIVES::

•• ProvingProving thethe usefulnessusefulness ofof CHRIS CHRIS WaterWater BandsBands forfor thethe monitoringmonitoring ofofphytoplanktonphytoplankton in in inlandinland waterswaters, , especiallyespecially cyanobacteriacyanobacteria

•• UsingUsing Rosarito as a Rosarito as a testtest sitesite forfor applyingapplying empiricalempirical modelsmodels forfor pigmentpigmentdetectiondetection, , developeddeveloped forfor MERIS, in CHRIS MERIS, in CHRIS imageryimagery

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Validation in CHRIS/Proba imagery

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Chlorophyll-a concentration 20/05/04

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EVOLUTION OF MEASURED AND ESTIMATED CHLOROPHYLL-A (SAMPLING POINT B )

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DATE

CH

L-a

(m

g m

-3)

MEASURED CHL-a

ESTIMATED CHL-a

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 34343434343434340 20 60 100 140 180 220 >250 mg m-3

Phycocyanin concentration 20/05/04

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EVOLUTION OF MEASURED AND ESTIMATED PHYCOCYANIN (SAMPLING POINT B )

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DATE

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MEASURED PC

ESTIMATED PC

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FINAL SUGGESTIONS

• An atmospheric correction algorithm for inland waters is still

needed

• Image delivery could be improved:

• An ftp downloading system would be faster and cheaper

than current CD-based delivery

LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep LAKES 29 sep BlgBlgBlgBlgBlgBlgBlgBlg 1414141414141414167 167 167 167 167 167 167 167 3737373737373737

AdvancesAdvances in in PhytoplanktonPhytoplankton PigmentPigment

MappingMapping in in SpanishSpanish ReservoirsReservoirs

PePeññaa--MartMartííneznez, Ram, Ramóónn, , RuizRuiz--VerdVerdúú, Antonio, , Antonio,

DomDomííngueznguez--GGóómezmez, Jos, Joséé AntonioAntonio

Centro de Estudios HidrogrCentro de Estudios Hidrográáficos del CEDEX. SPAINficos del CEDEX. SPAIN