3. Results and discussion
3.1. Description of study area
3.2. CDOM optical properties and distribution
3.2.1. Absorption
Full-size image (67 K)
Fig. 2.
Comparison of optical measurements [(A) aCDOM(355) and (B) Spectral slope, S] collected with a long (200 cm) versus a short (10 cm) pathlength; represents surface samples and samples below the mixed layer (30–60 m). (— — —─ ─ ─) represents linear regression; () represent the 1:1, while (———───) and (?????????) represent the 95% confidence intervals and prediction band respectively.
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At most sampling sites, CDOM PLX4720 increased with decreasing wavelength in an approximately exponential fashion (Fig. 3), similarly to that previously observed for both open oceans (Nelson and Siegel, 2002) and coastal environments (Blough and Del Vecchio, 2002). However, a sharper increase in absorbance at wavelengths ≤ 300 nm was observed at open ocean sites (e. g. stations 15, 23 & 49) as compared with those sites likely influenced by the outflow of the Congo River (specifically station 96) (Fig. 3). Occasionally, a small absorption shoulder at ~ 420 nm was also observed (Fig. 3,C, red line), similar to that reported by Rottgers and Koch (2012). However, unlike their study, this shoulder was only observed in a small percentage (
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Hfq stabilises the full length SmrC RNA and its specific
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