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Vertical profiles organic carbon

Tables 12.2 and 12.3. The effect of vertical variability is shown in Table 12.2, while the lateral spatial variability is shown in Table 12.3. The vertical and lateral spatial variabilities were defined on the basis of either the measured adsorption coefficient K), as generated from adsorption isotherms on soil profiles, or on adsorption coefficients on soil organic matter calculated as adsorption on organic carbon per unit weight of soil. We see that both vertical (Table 12.2) and lateral (Table 12.3) variability of soil affect the adsorption coefficients. A comparison between the bromide (conservative) and the two nonconservative herbicides distributions with depth after about 900mm of leaching is shown in Fig. 12.3. We see that, in the case of bromide, there is a continuous displacement of the center of mass with cumulative infiltration. In contrast, the bulk of the herbicide contaminant mass remains in the upper soil layer, with very little displacement. Tables 12.2 and 12.3. The effect of vertical variability is shown in Table 12.2, while the lateral spatial variability is shown in Table 12.3. The vertical and lateral spatial variabilities were defined on the basis of either the measured adsorption coefficient K), as generated from adsorption isotherms on soil profiles, or on adsorption coefficients on soil organic matter calculated as adsorption on organic carbon per unit weight of soil. We see that both vertical (Table 12.2) and lateral (Table 12.3) variability of soil affect the adsorption coefficients. A comparison between the bromide (conservative) and the two nonconservative herbicides distributions with depth after about 900mm of leaching is shown in Fig. 12.3. We see that, in the case of bromide, there is a continuous displacement of the center of mass with cumulative infiltration. In contrast, the bulk of the herbicide contaminant mass remains in the upper soil layer, with very little displacement.
Profiles of dissolved organic carbon (DOC) for four different times of the year from the Bermuda Atlantic Time-series Station (BATS). The arrow indicates the approximate mixed layer depth for these times of the year. The vertical shaded area represents the wintertime values. Redrawn from Carlson et al. (1994). [Pg.189]

Vertical profiles of concentration (circles) and A C (squares) versus water column depth for dissolved organic carbon in the temperate Pacific Ocean (after Druffel et a/., 1989). [Pg.296]

Although this simple analytical model could not be expected to describe DBCP movement through a soil profile which varied several fold in organic carbon content (and hence in Kvertical distance of even a few meters, it was considered adequate to compute... [Pg.369]

Correspondence between the vertical distribution of total organic carbon (TOC) at station 3C (approximately 6-8 km downcurrent from the outfall system) and the mass emissions of suspended solids from the outfall system during the period 1946-1981 is illustrated in Fig. 6. Following World War 11 and up until 1971, the monotonic increase in emissions of suspended solids from the LACSD paralleled the population trend in Los Angeles. Thereafter, solids emissions declined in response to improved source control and advances in waste treatment (Stull et al, 1996). The vertical concentration profile of TOC in the 3C (1981) core records the historical trend in effluent solids emissions and indicates that, for this period, the outfalls dominated sedimentation of organic carbon on the shelf. The dechne in emissions of suspended solids from the outfalls after 1971 became a matter of concern because of the potential for remobilization of heavily contaminated sediments that had been laid down in earlier years. [Pg.150]

Fig. 6. (a) Vertical concentration profile of total organic carbon (TOC) in sediment core collected from station 3C in 1981 and (b) historical emissions (mta = metric tons yr ) of suspended solids from the LACSD wastewater outfall system, 1946-1981 (modified from Eganhouse and Pontolillo, 2000). [Pg.151]


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