Statistical relationships between the average Chla concentration within the surface layer, [Chla]surf, and the Chla integrated content within the euphotic layer, Zeu, and within the 0–1.5 Zeu layer, 1.5 Zeu

Range Table - link
Organism Biosphere
Reference Julia Uitz, Herve´ Claustre, Andre´ Morel, and Stanford B. Hooker, Vertical distribution of phytoplankton communities in open ocean: An assessment based on surface chlorophyll, Journal of geophysical research, Vol. 111, 2006, C08005, doi:10.1029/2005JC003207 p.9 table 4
Method Abstract: "[1] The present study examines the potential of using the near-surface chlorophyll a concentration ([Chla]surf), as it can be derived from ocean color observation, to infer the column-integrated phytoplankton biomass, its vertical distribution, and ultimately the community composition. Within this context, a large High-Performance Liquid Chromatography (HPLC) pigment database was analyzed."
Comments P.8 right column bottom paragraph to p.9 left column 3rd paragraph: "[34] In the plot for stratified regimes (Figure 3a), a change in the slope (already noted in MB89 [Morel & Berthon 1989]) distinctly occurs around [Chla]surf ≈ 1 mg/m^3, so two separate regression analyses on each side of this threshold are carried out (Table 4). In the domain below the threshold, the scatter of the data points is more important than above, and reflects the variability partly due to the existence of a deep chlorophyll maximum typical of oligotrophic conditions. In mixed waters, the log-log plot of 〈Chla〉Zeu versus [Chla]surf (Figure 3b) shows a unique linear trend, a steeper slope (Table 4), and a lower scatter in the data points, as a result of the rather homogenous pigment distribution. [35] The present results are very consistent with, and independently confirm, those of MB89 (shown as dashed lines in Figure 3). The factor and exponent values (A and B) arrived at are slightly differing from those in MB89 (see Table 4), but the differences are statistically insignificant. The closeness of the exponents for mixed waters and for stratified waters as soon as [Chla]surf > 1 mg/m^3 (0.538 versus 0.615, respectively Table 4) emphasizes that the algal biomass in eutrophic conditions remains rather uniformly distributed within the euphotic layer, essentially as a consequence of its reduced thickness. [36] Because it is recognized that an important phytoplanktonic biomass is often present below the euphotic depth, the study is complemented by considering a thicker layer, extended down to 1.5 Zeu. The column content integrated over this layer, 〈Chla〉1.5 Zeu, is regressed against [Chla]surf, as above. The corresponding parameters A and B are provided in Table 4 (see also Figures 3c and 3d)." See notes beneath table
Entered by Uri M
ID 112623