In-situ depth profiling of particle sizes

The influence of schlieren on in situ optical measurements used for particle characterization

“…It should be realized that accumulation/aggregation of organic and inorganic particulate matter in the pycnocline can cause an increase in beam attenuation and particle size similar to the one observed here, as has been observed by Gentien et al (1995), for example. However, a plot of the 26 Chl a profiles demonstrates a general decrease in Chl a concentration at a depth between 3 and 10 mbs with a minimum at the base of the pycnocline, and no scatter of Chl a in the pycnocline (Fig.…”

“…It appears from Fig. 11 that the D 50 maxima and its temporal variability is largely unaffected by this removal, suggesting that the D 50 maxima is real, probably related to ongoing flocculation in the pycnocline (Gentien et al 1995). However, the temporal variability and magnitude of the VC maximum in the pycnocline are reduced, with VC falling from ~150 mm 3 L -1 tõ 50 mm 3 L -1…”

Effects of a sewage plume on the biology, optical characteristics, and particle size distributions of coastal waters

“…These data showed that there was a 2.7-to 5.5-fold increase in particle load in the plume compared with surrounding waters. The very low particle loads (especially relative to loads measured in European coastal waters [Gentien et al, 1995]) indicate that the Mamala Bay background waters were relatively oligotrophic during the cruise.…”

Layered organization in the coastal ocean: An introduction to planktonic thin layers and the LOCO project

“…While thin layers can contain mixed species assemblages and trophic levels , phytoplankton thin layers are often dominated by high concentrations of a single species (e.g. Nishitani et al, 1985;Richardson and Kullenberg, 1987;Nielsen et al, 1990;Dahl and Tangen, 1993;Bjørnsen and Nielsen, 1991;Carpenter et al, 1995;Gentien et al, 1995;Gisselson et al, 2002;Rines et al, 2002;Sullivan et al, 2003Sullivan et al, , 2005VeloSuarez et al, 2008). Interestingly, a large number of harmful algal species have been observed in thin layers (Rines et al, 2002, this issue;Sullivan et al, 2003Sullivan et al, , 2005McManus et al, 2008), indicating that understanding thin layers could be critical to harmful algal bloom research.…”