( ( ( Sea ( Ice ( Extent ( , ( Thickness ( , ( Brine rejection ) ) ) ) ) ) ) ( -LRB- ( Decrease -RRB- ) ) ) -- )
(ROOT (NP (NP (NNP Sea) (NNP Ice) (NNP Extent) (, ,) (NNPS Thickness) (, ,) (NNP Brine) (NNPS rejection)) (PRN (-LRB- -LRB-) (NP (NNP Decrease)) (-RRB- -RRB-)) (: --)))
Sea Ice Extent, Thickness, Brine rejection (Decrease) --
(ROOT (S (NP (NNP Rapid) (NN decrease)) (VP (VBZ is) (NP (NP (DT a) (NN trend)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBG occurring) (S (VP (VBG involving) (NP (NP (DT the) (NN extent)) (PP (IN of) (NP (NP (JJ arctic) (NN sea) (NN ice)) (PP (IN in) (NP (NN summer)))))))))))))) (. .)))