land to ocean transfer of organic carbon in the waipaoa sedimentary system
DESCRIPTION
Land to Ocean Transfer of Organic Carbon in the Waipaoa Sedimentary System. Hannah Brackley Landcare Research NZ Ltd. Erosion-related Carbon Losses. Poverty Bay Shelf. Organic Carbon (%). Depth (cm). Introduction. - PowerPoint PPT PresentationTRANSCRIPT
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Land to Ocean Transfer ofOrganic Carbon in the
Waipaoa Sedimentary System
Hannah Brackley
Landcare Research NZ Ltd
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Erosion-related Carbon Losses
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Introduction
Previous research has recognised an increase in OC burial on the Waipaoa River floodplain and Poverty Bay shelf since the arrival of Europeans.
Poverty Bay Shelf
De
pth
(cm
)
Organic Carbon (%)
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Waipaoa Sedimentary SystemCores collected from:
• Waipaoa River Floodplain
• Poverty Bay Shelf/slope:
U2303:– 7.5 km from river mouth
– 27 m water depth
U2305:
– 22.5 km from river mouth
– 56 m water depth
W697:
– 40 km from river mouth
– 1200 m water depth
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U2303 (27 m Water Depth)C
umul
ativ
e P
erce
nt
0
20
40
60
80
100
6–7 cm
% O
C
0.0
0.2
0.4
0.6
0.8
1.0
18–19 cm
% O
C
0
1
2
3
30–31 cm
% O
C0.0
0.2
0.4
0.6
0.8
1.0
6–7 cm 18–19 cm 30–31 cm
Bulk >25 m 4–25m <4 m
Bulk >25 m 4–25m <4 m
Particle Size Distributions
%OC in Size Fractions
Bulk >25 m 4–25m <4 m
% <4 m
% 4–25 m
% >25 m
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U2303 (27 m Water Depth)
% ofTotal OCin Sample
> 25 m < 4 m4–25m
> 25 m < 4 m4–25 m
Wei
ght
Per
cent
0
20
40
60
80
100
> 25 m < 4 m4–25 m
Wei
ght
Per
cent
0
20
40
60
80
100
Wei
ght
Per
cent
0
10
20
30
40
50
60
6–7 cm
30–31 cm
18–19 cm
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%OC as a Function of Particle Size2D Graph 2
%O
C
0.0
0.2
0.4
0.6
0.8
>25 m4-25 m<4 m
Floodplain Mid Shelf27 m
Mid Shelf56 m
UpperSlope
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13C Trends from Floodplain to Slope
-26
-25
-24
-23
-22
<4 m
>25 m
Floodplain Mid Shelf27 m
Mid Shelf56 m
UpperSlope
13C
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Questions
• How are flood events preserved on the shelf, and how do they influence the OC?
• How do changing terrestrial processes influence the amount and character of OC being transported offshore?
• Are the riverine particles losing their terrestrial OC when discharged to the ocean, and if so, are they reloading with marine OC?