Table 2. Sources of data for the P budget for the Black Sea in x 10⁷ mol/yr, unless noted differently.

	Shelf (0–200 m)	Basin (>200 m)	Source
Total sediment surface area (km2)	145 500	267 500	[35] and references therein
Mean mass accumulation rate (g/m2/yr)	264	63	[35] and references therein
Mean P content (µmol/g)	24.5	18.0	Own data from SEDEX (*)
Calculated P accumulation rate	94	30
P input by rivers	142 for period 1996–2000		[35]
Atmospheric P input	10		[57], [58]
Bosporus P input	32		[59]
Bosporus P output	49		[59]

Mean values for the relative P fractions were calculated from the P fractionation data (Fig 5).

*: based on sediments from 5 cm sediment depth downwards.