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5. Relative Effectiveness of a Radionuclide (210Pb), Surface Elevation Table (SET), and LiDAR At Monitoring Mangrove Forest Surface Elevation Change.

Author

MacKenzie, Richard A., Krauss, Ken W., Cormier, Nicole, Eperiam, Eugene, van Aardt, Jan, Kargar, Ali Rouzbeh, Grow, Jessica, and Klump, J. Val

Subjects
OPTICAL radar, LIDAR, MANGROVE forests, ABSOLUTE sea level change, MEASUREMENT errors
Abstract

Sea-level rise (SLR) is one of the greatest future threats to mangrove forests. Mangroves have kept up with or paced past SLR by maintaining their forest floor elevation relative to sea level through root growth, sedimentation, and peat development. Monitoring surface elevation change (SEC) or accretion rates allows us to understand mangrove response to SLR and prioritizes resilient ecosystems for conservation or vulnerable ecosystems for restoration. We compared three methods to measure SEC and accretion in mangrove forests: 210Pb, surface elevation tables (SETs), and a terrestrial light detection and ranging system (compact biomass LiDAR—CBL). Lead-210 accretion rates were not significantly different than SET SEC rates and differences between the two methods (− 2 to 2 mm/year) were within the error of our measurements. Lead-210 only measures accretion in the upper meter of sediment and cannot capture deeper subsurface processes (e.g., subsidence, compaction) that SETs can. The lack of differences suggests the following: (1) surface processes in the active root zone are influencing forest floor elevation more than subsurface processes, (2) subsurface processes were not large enough to effect elevation, or (3) the SETs were not installed deep enough to capture subsurface processes. CBL SEC rates did not differ significantly from SET SEC rates. The larger spatial scale of the CBL scans resulted in significantly different SEC rates from some of the plots. This was due to the CBL measuring areas missed by the SET. The greater number of points measured by CBL (~ 30,000 vs 36) increased precision and lowered standard error. The traditional SET/rSET method is currently 3–10 × cheaper than the 210Pb or CBL method, respectively, and can accurately track changes in forest floor elevation. Costs of the use of LiDAR are likely to decrease in the future with the advent of newer and more cost-effective technology. [ABSTRACT FROM AUTHOR]

Published
2024
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39. pyrolite: Python for geochemistry

Author

Williams, M, Schoneveld, L, Mao, Y, Klump, J, Gosses, J, Dalton, H, Bath, A, Barnes, S, Williams, M, Schoneveld, L, Mao, Y, Klump, J, Gosses, J, Dalton, H, Bath, A, and Barnes, S

Published
2020

40. Beryllium-7 as a tracer of short-term sediment deposition and resuspension in the Fox River, Wisconsin

Author

Fitzgerald, Sharon A., Swarzenski, Peter W., MacKenzie, Richard A., Richards, Kevin D., and Klump, J. Val

Subjects
Fox River -- Environmental aspects, Pollution control industry -- Research, Pulp industry -- Environmental aspects, Environmental issues, Science and technology
Abstract

Tracking Beryllium-7 with sediment cores, the authors are able to estimate the movements of PCBs in the Fox River in Wisconsin based on resuspension and deposition statistics. Residual PCBs from the paper and pulp industry are charted for movement due to erosion fluctuations and other factors, instead of the distance from historical point sources of contamination.

Published
2001

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