During two cruises of the MEDUZA experiment conducted in July 2003 and May 2005 various data were obtained over the deepest part of the southern Adriatic Pit. Temperature, salinity, light
transmission and fluorescence were measured in July 2003. During May 2005, except CTD measurements the samples were taken for laboratory determination of phytoplankton pigments with HPLC
technique. During both cruises irradiance and radiance were measured at 14 wavelengths in the range 340-715 nm with optical probe to about 100 m depth. Bad weather conditions during both
cruises caused interruption of measurements that continued after 24 to 48 hours. Stormy conditions have resulted in a slightly different structure of the water column. In the periods of measurements
recorded were diurnal rhythms in a series of parameters, caused by solar radiation cycles in the surface layers as well as fluctuations in the deeper layers under the influence of the internal tide. Meteorological conditions and changes in sea level are also described. The analysis included the principal component and correlation analysis between the measured and derived parameters in order to establish a link between the in-situ pigments and multispectral data. During both cruises diurnal vertical oscillations were observed in biotic and abiotic parameters. Chlorophyll pigments
prevailed over other pigments preventing other pigments to be distinguished spectrally. Regression models for chlorophyll a were established from radiance and reflectance ratios.Tijekom nekoliko krstarenja u okviru Meduza eksperimenta obavljenih u srpnju 2003 i svibnju 2005 (http://jadran.izor.hr/meduza/meduza_g.htm), pribavljeni su raznovrsni podaci iznad najdubljeg
dijela južnog Jadrana. Temperatura, salinitet, propusnost za svjetlost i fluorescencija mjereni su u srpnju 2003. Tijekom svibnja 2005., osim CTD mjerenja uzeti su uzorci za laboratorijsko određivanje pigmenata fitoplanktona. Tijekom oba krstarenja mjereno je zračenje na 14 valnih duljina u rasponu 340-715nm optičkom sondom do oko 100m dubine. Loši vremenski uvjeti tijekom oba
krstarenja uzrokovali su prekid mjerenja koja se nastavljaju nakon 24 odnosno 48 sati. Olujni uvjeti rezultirali su nešto drugačijom strukturom vodenog stupca. U razdobljima mjerenja zabilježeni su
dnevni ritmovi u nizu parametara, uzrokovani ciklusima sunčeva zračenja u površinskim slojevima kao i oscilacije u dubljim slojevima zbog unutarnje plime. Meteorološki uvjeti i promjene razine mora su također diskutirani. Analiza je obuhvatila i korelacije između izvedenih i mjerenih parametara s ciljem da uspostavi veza između koncentracija mjerenog klorofila i multispektralnih podataka. Tijekom oba krstarenja opažene su dnevne vertikalne oscilacije biotskih i abiotskih pametera. Klorofilni su pigmenti prevladavali onemogućujući spektralno prepoznavanje ostalih pigmenata.
Utvrđeni su regresivni modeli za klorofil a na osnovi mjerenja radijanca i reflektancija
