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PROFILE A 2002-2003

Study of thermohaline and optical properties in a specific area, analyzing temperature, salinity variations, light availability for photosynthesis, chlorophyll-like pigments concentration, and more in relation to thermohaline characteristics.

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PROFILE A 2002-2003

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  1. 1.3.2.Thermohaline and optical properties of the Drvenik-Hvar-Pelješac areaBranka Grbec1(thermohaline),M ira Morović1*(optical),Frano Matić1, Vlado Dadić1, Igor Palandžić21-Institute of Oceanography and Fisheries, Split, Croatia2-Hydraulical Institute, Sarajevo, Bosnia and Herzegovina

  2. PROFILE A 2002-2003

  3. PROFILE B 2002-2003

  4. PROFILE C – NERETVA ESTUARY 2002-2003

  5. July 2006 Strong heating caused sea temperatures above 26 oC. Shallow thermocline, because of the absence of stronger winds. Low impact of less saline coastal watersat the surface.

  6. Strong heating Low salinity water (salinity < 34) occupied surface layers in the most southward part of the area. July 2006

  7. September 2006 Thermocline depth was fully developed, below 20 m. Impact of freshwater at the surface lower than in June.

  8. Conditions during September cruise were stable with more uniform spatial distribution of temperature and salinity with respect to July. September 2006

  9. High resolution measurements of downward irradiance and upward radiance at 14 wavelengths from UV to visible light(340; 380; 412; 443; 465; 490; 510; 532; 555; 589; 625; 665; 683; 710); PAR attenuation (400-700nm); fluorescence Processing: 1.Determining cast options 2.Selection of better cast for each measurement 3.Dark callibration 4.Calculations Kd=dln(Ed(z))/dz Ku=dln(Lu(z))/dz KPar= dln(EPar(z))/dz

  10. 1. Qualitative and quantitative analysis of spectrum 2. Changes with depth 2. Attenuation coefficients for every wavelength and for PAR 3. Amount of light available for photosynthesis 4. Euphotic zone depth 5. Optical signature of chlorophyll-like pigments (for comparison of chlorophyll signature from remote sensing) 6. Estimates of concentration of chlorophyll-like pigments 7. Estimation of optical types 8. Estimation of different optical functions

  11. PAR irradiance (%) relative to the subsurface in July and September

  12. PAR attenuation coefficients in July and September

  13. July September

  14. Figure 10. Estimated concentration of chlorophyll-like pigments in July (left) and September (right). Estimates of chlorophyll-like pigments concentrations for July and September 2006 In September, relative to July, the stations close to Klek-Neum Bay, in the surface 10meters, have for the order of magnitude higher estimates of chlorophyll

  15. Chlorophyll from MODIS for July and September AVHRR temperature

  16. Concluding remarks • According to water characterisation by Matić (2004), the three characteristic sub-regionscan be distinguished: • 1. Neretva River estuary (St11-St23) - surface layer of permanently low salinity but spatially and temporally changeable under local meteorological conditions; • 2. channel waters (St01-St03, St07-St08) – low salinity surface water influenced by the three main rivers: Neretva, Cetina and Jadro; and • 3. waters similar to the open sea (St04-St06) without considerable influence from river runoff and vertically well mixed in the cold period of year. • Stations from waters similar to the open sea have different spectrum characteristics from stations of the Neretva river estuary (Klek-Neum area); spectrum max intensity for estuary area is shifted towards longer wavelengths. • Higher attenuation coefficients (for PAR and wavelengths) in September than in July especially in the Klek-Neum area • Higher chlorophyll-like pigments concentrations estimated for September especially at the surface for most stations, than for July, especially in the Klek-Neum area • Optical characteristics are related to thermohaline characterisation

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