Table 1.

Fractional abundance of core GDGTs (and GTGT-0) synthesized by the sedimentary AOA analyzed in this work

Enrichment	GTGT-0	GDGT fractional abundancea														TEX86b	Tempc (°C)
		0	1	1′	1″	2	2′	2″	3	3′	3″	4	4′	cren	cren′
“Ca. Nitrosoarchaeum limnia”	0.001	0.35	0.17	0.01	ND	0.05	0.005	ND	0.01	0.006	ND	0.04	0.005	0.34	0.004	0.27	−0.6
SJ	0.00	0.26	0.08	0.01	0.004	0.11	0.02	0.01	0.08	0.03	0.03	0.12	ND	0.24	0.01	0.70	28.0
AR	0.001	0.31	0.10	0.01	0.002	0.09	0.01	0.003	0.04	0.02	0.008	0.04	ND	0.35	0.006	0.56	21.4

^aGDGTs with ′ or ″ indicate isomers identified in the respective chromatograms (exact structures unknown); numbers correspond to the structures shown in Fig. 1. cren, crenarchaeol. ND, not detected.

^bTEX₈₆ values were calculated according to the method of Schouten et al. (35).

^cTemperature was calculated according to the method of Kim et al. (18) using the TEX₈₆^H calibration for SJ and AR and the TEX₈₆^L calibration for “Ca. Nitrosoarchaeum limnia.”