( ( Export production ) ( ( is ( ( the amount ) ( of ( ( organic matter ) ( ( produced ( in ( the ocean ) ) ) ( by ( ( primary production ) ( that ( ( is not ) ( ( recycled ( -LRB- ( remineralised -RRB- ) ) ) ( before ( it ( sinks ( into ( the ( aphotic zone ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Export) (NN production)) (VP (VBZ is) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (JJ organic) (NN matter)) (VP (VBN produced) (PP (IN in) (NP (DT the) (NN ocean))) (PP (IN by) (NP (NP (JJ primary) (NN production)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (RB not) (VP (VBN recycled) (PRN (-LRB- -LRB-) (VP (VBN remineralised)) (-RRB- -RRB-)) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ sinks) (PP (IN into) (NP (DT the) (JJ aphotic) (NN zone))))))))))))))))) (. .)))
Export production is the amount of organic matter produced in the ocean by primary production that is not recycled (remineralised) before it sinks into the aphotic zone.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT the) (JJ lightless) (NN part)) (PP (IN of) (NP (DT the) (NN ocean) (JJ aphotic) (NN zone))))) (. .)))