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Muacho , S. (1) , d a Silva, J.C.B., Brotas , V., Oliveira, P.

Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay. Muacho , S. (1) , d a Silva, J.C.B., Brotas , V., Oliveira, P. .

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Muacho , S. (1) , d a Silva, J.C.B., Brotas , V., Oliveira, P.

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  1. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Muacho , S. (1) , da Silva, J.C.B., Brotas, V., Oliveira, P. (1) IPMA - Portuguese Institute for Ocean and Atmosphere

  2. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Questions: Can Internal Tidal (IT) waves influence (sub)surface chlorophyll distribution? Can IT increase ocean productivity? ROI: • Nazaré Canyon (western Portugal) - Central BayofBiscay

  3. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay What are IT waves? tidal period *courtesyof Da Silva (in Robinson, 2010)

  4. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Depth (m)

  5. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Depth (m)

  6. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Internal Solitary Waves courtesyof Quaresma, L. (2006)

  7. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Nazaré Canyon (western Portugal) Internal Solitary Waves: usually phase-locked to the interfacial ITs, and appear close to the IT troughs (see e.g. Jeans and Sherwin, 2001) Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  8. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Nazaré Canyon (western Portugal) Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  9. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay “Canyons” (R/V PELAGIA – NIOZ Institute) Nazaré Canyon (western Portugal) Internal Solitary wavefronts Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  10. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay sigma-theta CHL CHLSAT=f(CHL,K) Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  11. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Synergy SAR / log(CHL(mg.m-3)) MODIS 14:15 UTC 10.09.2006 v ~ 0.7 m.s-1 Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  12. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  13. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay coherent with non-linear IT Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  14. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Ecological effect? Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  15. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Primary production: PP (z) =CHL (z).Pbmax [1 – exp (-α.E(z)/Pbmax] Platt et al. (1980) formulation, without photoinhibition Sathyendranathet al. (1995) climatological data Platt T, Gallecos CL, Harrison WG (1980). Photoinhibition on photosynthesis in natural assemblages of marine phytoplankton, Journal of Marine Research, 38, 687-701. Sathyendranath S, Longhurst I, Caverhill CM, Platt T (1995). Regionally and seasonally differentiated primary production in the North Atlantic, Deep Sea Research I, Vol. 42, No. 10, 1773-1802. Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  16. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Primary production: PP (z) =CHL (z).Pbmax [1 – exp (-α.E(z)/Pbmax] Platt et al. (1980) formulation, without photoinhibition Sathyendranathet al. (1995) climatological data Platt T, Gallecos CL, Harrison WG (1980). Photoinhibition on photosynthesis in natural assemblages of marine phytoplankton, Journal of Marine Research, 38, 687-701. Sathyendranath S, Longhurst I, Caverhill CM, Platt T (1995). Regionally and seasonally differentiated primary production in the North Atlantic, Deep Sea Research I, Vol. 42, No. 10, 1773-1802. Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  17. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay Primary production: PP (z) =CHL (z).Pbmax [1 – exp (-α.E(z)/Pbmax] Platt et al. (1980) formulation, without photoinhibition Sathyendranathet al. (1995) climatological data Platt T, Gallecos CL, Harrison WG (1980). Photoinhibition on photosynthesis in natural assemblages of marine phytoplankton, Journal of Marine Research, 38, 687-701. Sathyendranath S, Longhurst I, Caverhill CM, Platt T (1995). Regionally and seasonally differentiated primary production in the North Atlantic, Deep Sea Research I, Vol. 42, No. 10, 1773-1802. Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  18. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay 1627 mgC.m-2.d-1 1497 mgC.m-2.d-1 Muacho, S., da Silva, J.C.B., and Brotas, V. (submitted). Internal waves effect on near surface chlorophyll concentration and primary production in the Nazaré canyon. Deep-Sea Research Part I

  19. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay BayofBiscay Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  20. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay BayofBiscay da Silva JCB, New AL, Srokosz M, Smyth T (2002) On the observability of internal tidal waves in remotely-sensed ocean color data. Geophys. Res. Lett. 29 (12), 1569-1572. Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  21. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay ENVISAT-ASAR 12.08.2005 Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  22. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay ENVISAT-ASAR 12.08.2005 I Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  23. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay “local generation” of ISW Azevedo A, da Silva JCB, New AL (2006). On the generation and propagation of internal waves in the southern Bay of Biscay. Deep-Sea Res. I 53 da Silva JCB, New AL, Azevedo A (2007). On the role of SAR for observing “Local Generation” of internal solitary waves off the Iberian Peninsula. Can. J. Remote Sens. 33, 388-403 Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  24. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay “local generation” of ISW Azevedo A, da Silva JCB, New AL (2006). On the generation and propagation of internal waves in the southern Bay of Biscay. Deep-Sea Res. I 53 da Silva JCB, New AL, Azevedo A (2007). On the role of SAR for observing “Local Generation” of internal solitary waves off the Iberian Peninsula. Can. J. Remote Sens. 33, 388-403 Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  25. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay SAR / CHL (mg.m-3) MODIS 11.08.2005 Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  26. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay SAR / CHL (mg.m-3) MODIS 11.08.2005 SAR / CHL (mg.m-3) MODIS 14.09.2003 Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  27. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay This strong internal wave activity in the region of the central Bay (particularly intense in late summer) has any effect on ocean colour data on a larger timescale? Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  28. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay This strong internal wave activity in this region of the central Bay (particularly intense in late summer) has any effect on ocean colour data on a larger timescale? Monthly climatology from ocean colour data from late summer (September) has been used. September was chosen for two primary reasons: It coincides with stronger thermocline stratification conditions (e.g. Pingree and New, 1995) Has one of the two highest spring tides of the year (the other is in March), wherein internal waves are more frequent and stronger. Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  29. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay September chlorophyll (log(CHL(mg.m-3))) climatology (2002-11) from MODIS Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  30. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay September chlorophyll (log(CHL(mg.m-3))) climatology (2002-11) from MODIS Muacho, S., da Silva, J.C.B., and Brotas, V. (in prep.). Chlorophyll enhancement in the central region of the Bay of Biscay as a result of internal (tidal) wave interaction.

  31. Internal tidal waves effects on near-surface chlorophyll concentration and primary production around Nazaré Canyon (western Portugal) and in the central region of the Bay of Biscay • Conclusions • The results show that: • PP can increase up to 8% due to the presence of IT crests; • strong IT activity also presents ocean colour signatures on climatology satellite data. In summary, IT waves can play an important role in the regional ecology in some coastal or oceanic regions, such as the Nazaré Canyon and the central of the Bay of Biscay.

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