Table 1 Variables Used to Calculate Long-Term (1870–2017) Organic Carbon (OC) Erosion Rates for the Virginia Barrier Islands

Island

Combined

Thickness (m)

Exposure rate (m² yr⁻¹)

OC density (kg OC m⁻³)

Thickness (m)

Shoreline change rate (m yr⁻¹)

1870 island length (m)

OC density (kg OC m⁻³)

OC erosion rate (Gg OC yr⁻¹)

Assa.

1.26 ± 0.25

14243 ± 672

23.6 ± 3.3

5.63 ± 0.38

4.74 ± 0.68

6599 ± 16

8.2 ± 1.0

1.86 ± 0.31

Met.

0.66 ± 0.16

53135 ± 2508

26.8 ± 3.9

7.26 ± 3.06

7.67 ± 1.45

11442 ± 16

6.7 ± 0.8

5.21 ± 2.06

Cedar

1.07 ± 0.27

41734 ± 1970

27.6 ± 4.0

7.63 ± 3.38

6.68 ± 1.37

10687 ± 16

9.1 ± 1.2

6.18 ± 2.52

Parra.

0.90* ± 0.36*

161 ± 8

26.8* ± 4.1*

3.50 ± 2.75

5.94 ± 1.82

13000 ± 16

7.6* ± 1.0*

2.04 ± 1.74

Hog

0.90* ± 0.36*

3775 ± 178

26.8* ± 4.1*

3.50^ɫ ± 2.75^ɫ

3.10 ± 1.95

11288 ± 16

7.6* ± 1.0*

1.01 ± 0.94

Cobb

0.98 ± 0.36*

15909 ± 751

31.5 ± 4.4

4.55 ± 1.98*

3.03 ± 2.77

10256 ± 16

10.1 ± 1.3

1.92 ± 1.47

Wreck

1.18 ± 0.88

22004 ± 1039

27.1 ± 3.9

8.47 ± 2.82

5.72 ± 3.21

3934 ± 16

7.5 ± 0.9

2.13 ± 1.09

S.S.

0.90* ± 0.36*

12432 ± 587

26.8* ± 4.1*

6.63* ± 1.98*

8.07 ± 3.14

3405 ± 16

7.6* ± 1.0*

1.68 ± 0.71

Myrtle

0.60 ± 0.36*

15240 ± 719

27.5 ± 4.3

6.90 ± 1.98*

6.38 ± 2.35

3659 ± 16

5.9 ± 0.8

1.20 ± 0.49

Smith

0.56 ± 0.24

46484 ± 2194

23.3 ± 4.8

5.98^† ± 0.29

5.63 ± 1.01

12633 ± 16

5.3 ± 0.7

2.87 ± 0.58