We present 3

Abstract. A new procedure to quantify, the components of oceanic helium ("terrigenic" 3He and 4He released from the ocean floor and "tritiugenic" 3He from tritium decay) is described. Terrigenic He and nonatmospheric 3He (i.e., terrigenic and tritiugenic combined) are obtained in terms of measured concentrations of the He isotopes and also of neon (Ne) (which improves the separation considerably), asstuning terrigenic He to vanish in the mixed layer. For the subsequent separation of terrigenic and tritiugemc 3He, additional information is required and 3He due to natural tritium represents a complication. The procedure is applied to data from a

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