An Areal Assessment of Subseafloor Carbon Cycling in Cold Seeps and Hydrate-Bearing Areas in the Northern South China Sea

Table 1

Biogeochemical rates and effluxes of methane and DIC in the three areas.

Location	CH4 efflux				DIC efflux				OSR				ME				AOM				CP				Cores
	RM	AM	SD	Average	RM	AM	SD	Average	RM	AM	SD	Average	RM	AM	SD	Average	RM	AM	SD	Average	RM	AM	SD	Average
Dongsha	0.2	9.7	95	4.9	25.3	19.3	7	22.3	14.1	17.7	12	15.9	5.1	4.8	4	4.9	29.0	26.7	14	27.8	5.5	5.4	1	5.3	363
Xisha	0.1	144	366	72	36.0	246.2	136	141	27.6	14.6	20	21.1	2.6	1.5	1	2	9.4	261.1	385	135.2	27.3	37.4	28	32.3	8
Shenhu	0.0	0.1	1	0.0	17.1	19.8	5	18.4	5.8	9.8	2	7.8	1.4	2.8	1	2.1	16.8	18.2	5	17.5	5.4	6.3	1.6	5.8	24
North SCS	0.13	11.3	96	5.7	29.5	62.9	178	46.2	19.6	13.4	12	16.5	3.6	3.2	3	3.4	19.0	60.8	180	39.9	15.4	12	17	13.7	395

RM: raster mean; AM: arithmetical mean; SD: standard deviation.