A comparison of 13C, 15N in TOM in surficial sediment layer and estimated terrigenous carbon contribution (TC, %) to the marine coastal environment in Asian region.

Table 3: A comparison of 13C, 15N in TOM in surficial sediment layer and estimated terrigenous carbon contribution (TC, %) to the marine coastal environment in Asian region.

Site	TOM, %	TN, %	C:N	d¹³C, ‰	d¹⁵N, ‰	TC, %	References
Yangtze River estuary, China	na	na	na	-28.9 to -24.3	2.7-4.5	nd	[48]
Ganga River, Bangladesh	na	na	na	-22.4 to -20.0	nd	Dominant	[59]
Ayeyarwady and Salween Rivers estuary, Myanmar	0.07-2.66	0.01-0.2	2.7-14.5	-26.4 to -21.9	3.3-5.4	< 40 to > 90	[16]
Pearl River estuary, South China			6.8-15.2	-25 to -21	nd	nd	[60]
Bo Hai Bay, China	1.0-7.5	0.1-0.2	15-42	-26 to -19	4-14	38	[61]
Ha Long Bay, Vietnam	0.5-4.4	0.04-0.13	6.8-30.4	-26.5 to -24.6	4.55-5.56	65-92	This study
Ha Long Bay^* (center), Vietnam	2.18	0.01	20	-20.73	4.15	nd	[39]

*Sediment at 11-13 cm depth from surface; na: Not Analyzed; nd: Not Determined.