Relative sea-level change in South Florida during the past ~5000 years
A paucity of detailed relative sea-level (RSL) reconstructions from low latitudes hinders efforts to understand the global, regional, and local processes that cause RSL change. We reconstruct RSL change during the past ~5 ka using cores of mangrove peat at two sites (Snipe Key and Swan Key) in the F...
| Main Authors: | , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/168874 |
| _version_ | 1826114610197954560 |
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| author | Khan, Nicole S. Ashe, Erica Moyer, Ryan P. Kemp, Andrew C. Engelhart, Simon E. Brain Matthew J. Toth, Lauren T. Chappel, Amanda Christie, Margaret Kopp, Robert E. Horton, Benjamin Peter |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Khan, Nicole S. Ashe, Erica Moyer, Ryan P. Kemp, Andrew C. Engelhart, Simon E. Brain Matthew J. Toth, Lauren T. Chappel, Amanda Christie, Margaret Kopp, Robert E. Horton, Benjamin Peter |
| author_sort | Khan, Nicole S. |
| collection | NTU |
| description | A paucity of detailed relative sea-level (RSL) reconstructions from low latitudes hinders efforts to understand the global, regional, and local processes that cause RSL change. We reconstruct RSL change during the past ~5 ka using cores of mangrove peat at two sites (Snipe Key and Swan Key) in the Florida Keys. Remote sensing and field surveys established the relationship between peat-forming mangroves and tidal elevation in South Florida. Core chronologies are developed from age-depth models applied to 72 radiocarbon dates (39 mangrove wood macrofossils and 33 fine-fraction bulk peat). RSL rose 3.7 m at Snipe Key and 5.0 m at Swan Key in the past 5 ka, with both sites recording the fastest century-scale rate of RSL rise since ~1900 CE (~2.1 mm/a). We demonstrate that it is feasible to produce near-continuous reconstructions of RSL from mangrove peat in regions with a microtidal regime and accommodation space created by millennial-scale RSL rise. Decomposition of RSL trends from a network of reconstructions across South Florida using a spatio-temporal model suggests that Snipe Key was representative of regional RSL trends, but Swan Key was influenced by an additional local-scale process acting over at least the past five millennia. Geotechnical analysis of modern and buried mangrove peat indicates that sediment compaction is not the local-scale process responsible for the exaggerated RSL rise at Swan Key. The substantial difference in RSL between two nearby sites highlights the critical need for within-region replication of RSL reconstructions to avoid misattribution of sea-level trends, which could also have implications for geophysical modeling studies using RSL data for model tuning and validation. |
| first_indexed | 2024-10-01T03:41:54Z |
| format | Journal Article |
| id | ntu-10356/168874 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:41:54Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1688742023-06-26T15:30:35Z Relative sea-level change in South Florida during the past ~5000 years Khan, Nicole S. Ashe, Erica Moyer, Ryan P. Kemp, Andrew C. Engelhart, Simon E. Brain Matthew J. Toth, Lauren T. Chappel, Amanda Christie, Margaret Kopp, Robert E. Horton, Benjamin Peter Asian School of the Environment Earth Observatory of Singapore Science::Geology Relative Sea Level Florida A paucity of detailed relative sea-level (RSL) reconstructions from low latitudes hinders efforts to understand the global, regional, and local processes that cause RSL change. We reconstruct RSL change during the past ~5 ka using cores of mangrove peat at two sites (Snipe Key and Swan Key) in the Florida Keys. Remote sensing and field surveys established the relationship between peat-forming mangroves and tidal elevation in South Florida. Core chronologies are developed from age-depth models applied to 72 radiocarbon dates (39 mangrove wood macrofossils and 33 fine-fraction bulk peat). RSL rose 3.7 m at Snipe Key and 5.0 m at Swan Key in the past 5 ka, with both sites recording the fastest century-scale rate of RSL rise since ~1900 CE (~2.1 mm/a). We demonstrate that it is feasible to produce near-continuous reconstructions of RSL from mangrove peat in regions with a microtidal regime and accommodation space created by millennial-scale RSL rise. Decomposition of RSL trends from a network of reconstructions across South Florida using a spatio-temporal model suggests that Snipe Key was representative of regional RSL trends, but Swan Key was influenced by an additional local-scale process acting over at least the past five millennia. Geotechnical analysis of modern and buried mangrove peat indicates that sediment compaction is not the local-scale process responsible for the exaggerated RSL rise at Swan Key. The substantial difference in RSL between two nearby sites highlights the critical need for within-region replication of RSL reconstructions to avoid misattribution of sea-level trends, which could also have implications for geophysical modeling studies using RSL data for model tuning and validation. Ministry of Education (MOE) National Research Foundation (NRF) Submitted/Accepted version Authors were supported by National Science Foundation Awards (OCE-1702587, OCE-1831450, and OCE-2002437 to Kopp and Ashe; OCE-2002431, OCE-1458921, OCE-1831382, and OCE-1942563 to Kemp; OCE-1458903 to Engelhart). RPM is supported by the US Fish and Wildlife Service’s State Wildlife Grants Program (#F13AF00982). BPH is supported by the Singapore Ministry of Education Academic Research Fund MOE2019-T3-1-004 and MOE-T2EP50120-0007, the National Research Foundation Singapore, the Singapore Ministry of Education under the Research Centers of Excellence Initiative. 2023-06-21T05:37:14Z 2023-06-21T05:37:14Z 2022 Journal Article Khan, N. S., Ashe, E., Moyer, R. P., Kemp, A. C., Engelhart, S. E., Brain Matthew J., Toth, L. T., Chappel, A., Christie, M., Kopp, R. E. & Horton, B. P. (2022). Relative sea-level change in South Florida during the past ~5000 years. Global and Planetary Change, 216, 103902-. https://dx.doi.org/10.1016/j.gloplacha.2022.103902 0921-8181 https://hdl.handle.net/10356/168874 10.1016/j.gloplacha.2022.103902 2-s2.0-85136523848 216 103902 en MOE2019-T3-1-004 MOE-T2EP50120-0007 Global and Planetary Change © 2022 Elsevier B.V. All rights reserved. This paper was published in Global and Planetary Change and is made available with permission of Elsevier B.V. application/pdf |
| spellingShingle | Science::Geology Relative Sea Level Florida Khan, Nicole S. Ashe, Erica Moyer, Ryan P. Kemp, Andrew C. Engelhart, Simon E. Brain Matthew J. Toth, Lauren T. Chappel, Amanda Christie, Margaret Kopp, Robert E. Horton, Benjamin Peter Relative sea-level change in South Florida during the past ~5000 years |
| title | Relative sea-level change in South Florida during the past ~5000 years |
| title_full | Relative sea-level change in South Florida during the past ~5000 years |
| title_fullStr | Relative sea-level change in South Florida during the past ~5000 years |
| title_full_unstemmed | Relative sea-level change in South Florida during the past ~5000 years |
| title_short | Relative sea-level change in South Florida during the past ~5000 years |
| title_sort | relative sea level change in south florida during the past 5000 years |
| topic | Science::Geology Relative Sea Level Florida |
| url | https://hdl.handle.net/10356/168874 |
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