Freshwater and Saline Loads of Dissolved Inorganic Nitrogen to Hood Canal and Lynch Cove, Western Washington

Scientific Investigations Report 2006–5106

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5106

Table 10. Mean concentrations of particulate organic carbon, particulate organic nitrogen, and chlorophyll a and the chemical composition particulate organic matter in groupings of water samples from Lynch Cove, western Washington, September 2004.

[Group: Groups were determined using principal component analysis of POC, chlorophyll a, δ¹³C, and C:N ratio. Abbreviations: POC, particulate organic carbon; PON, particulate organic nitrogen; δ¹⁵N, fractionation of N (see equation 5); C:N, atomic ration of carbon to nitrogen; Std dev, standard deviation; mg/L, microgram per liter. Zeros were substituted for “less than values” to compute means]

Group		Number of samples	Nitrate (mg/L)	Concentration		Chlorophyll a (µg/L)	Composition of particulate organic matter
Group		Number of samples	Nitrate (mg/L)	POC (mg/L)	PON (mg/L)	Chlorophyll a (µg/L)	C:N ratio	δ¹³C (per mil)	δ¹⁵N (per mil)
Primary group
High chlorophyll a		3	0.170	0.45	0.097	8.0	6.4	-23.2	8.1
Deep, with no POC		3	.287	<.12	<.02	.2	7.8	-24.8	7.6
High C:N		1	.043	.28	.069	3.2	9.3	-24.1	9.4
Surface, low POC		1	.007	<.12	.02	.8	7.3	-25.5	8.1
	Mean	26	.085	.34	.063	2.0	6.9	-24.4	8.8
	Std dev		.157	.13	.021	.8	.6	.7	1.5
Deep and shallow sites
Deep water sites	Mean	13	0.165	0.27	0.051	1.9	6.9	-24.4	8.9
	Std dev		.192	.12	.015	.9	.8	.6	1.8
Shallow water sites	Mean	13	.005	.40	.075	2.0	6.9	-24.4	8.8
	Std dev		.016	.10	.020	.7	.5	.8	1.2
	p-values						.91	.96	.91
Upper layer versus lower layer
Upper layer	Mean	19	0.000	0.38	0.069	1.7	7.0	-24.3	9.0
	Std dev		.001	.11	.019	.5	.6	.7	1.2
Lower layer	Mean	7	.314	.21	.046	2.7	6.5	-24.7	8.4
	Std dev		.135	.07	.019	1.1	.4	.5	2.4
	p-values						.04	.11	.37
Upper layer versus lower layer for deep water sites
Upper layer	Mean	7	0.000	0.341	0.059	1.5	7.3	-24.2	9.0
	Std dev		.000	.110	.011	.5	.8	.5	1.5
Lower layer	Mean	6	.357	.191	.041	2.5	6.4	-24.7	8.9
	Std dev		.082	.052	.013	1.1	.4	.6	2.4
	p-values						.07	.17	.94

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