Table 1.

Comparison of krill faecal pellet (FP) POC export at 100 m (this study) with literature estimates of total POC export

Data source/model algorithm	POC export flux in the MIZa (GT C yr−1)	Krill FP contribution to POC exportb (%)	POC export flux south of 60 °Sc (GT C yr−1)	Krill FP contribution to POC exportb (%)
This study -krill FPs only	0.039
Satellite-based estimates d
Carr, Henson	0.076	51.5	0.101	38.5
Carr, Dunne	0.122	32.0	0.152	25.6
Carr, Laws	0.209	18.6	0.281	13.8
Marra, Henson	0.082	47.2	0.104	37.4
Marra, Dunne	0.137	28.4	0.160	24.3
Marra, Laws	0.227	17.1	0.289	13.5
VGPM, Henson	0.064	60.6	0.090	43.3
VGPM, Dunne	0.103	37.6	0.135	28.8
VGPM, Laws	0.177	21.9	0.250	15.5
POC export models
Primeau et al. 2013e,f			0.22	17.7
Schlitzer et al. 2002e			1.00	3.9
MacCready et al. 2001e			0.31	12.5

^aEstimates are for the productive season, October–March. For satellite-based estimates these are for the region south of the maximum ice extent during the productive period defined here (i.e. location of 15% sea ice concentration for period 1–13 October 1994–2014)

^bPercentage contribution of our estimate of krill FP export flux (0.039 GT C yr ⁻¹) to various total POC export estimates

^cAnnual export for the region south of 60 °S, with the exception of Schlitzer et al. (2002) and Primeau et al. (2013) which are for the regions south of 50 °S and 55–60 °S, respectively.

^dNamed according to the input primary production and export (see methods)

^eAnnual export

^fExport at base of euphotic zone (73.4 m)