A potential suite of climate markers of long-chain n-alkanes and alkenones preserved in the top sediments from the Pacific sector of the Southern Ocean

Progress in Earth and Planetary Science

Table 2 The relative abundance and concentrations of C_37:4, C_37:3, and C_37:2 alkenones and based on \( {U}_{37}^{\mathrm{k}} \)- and \( {U}_{37}^{\mathrm{k}\prime } \)-SST in the subsamples with different sediment depth of core R23

Depth (cm)	C_37:4 (%)	C_37:3 (%)	C_37:2 (%)	Alkenones (ng/g)	\( {U}_{37}^{\mathrm{k}} \)-SST^a (°C)	\( {U}_{37}^{\mathrm{k}\prime } \)-SST^b (°C)
16	12	85	4	90.7	0.6	−0.1
88	11	87	3	104.2	0.7	−0.4
166	30	40	30	13.2	2.8	11.5
243	21	51	28	15.3	4.4	9.2
323	35	48	17	14.7	−1.7	6.6
398	16	64	19	50.1	3.5	5.6
482	15	80	6	65.1	0.5	0.7
550	37	38	24	12.6	−0.6	10.3
626	30	44	26	14.0	1.8	9.9
698	23	59	18	19.1	1.2	5.7
762	25	27	48	30.2	8.4	17.9
818	30	36	34	19.0	3.6	13.2

^a\( {\mathrm{U}}_{37}^{\mathrm{k}\prime } \) = C_37:2/(C_37:2+ C_37:3)
^b\( {\mathrm{U}}_{37}^{\mathrm{k}} \) = (C_37:2-C_37:4)/(C_37:2+ C_37:3+ C_37:4)