Unravelling climatic influences on late Holocene sea-level variability

Ian D. Goodwin*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

13 Citations (Scopus)

Abstract

Predictions of future coastal change in response to 'Greenhouse Warming' have been based on a historical, secular trend in sea-level rise, with an estimated total rise of up to 0.88 m, and an average estimate of 0.4 ± 0.1 m over the next 100 years (Houghton et al., 2001). However, our knowledge of past decadal to centennial sea-level change and its influence on coastal evolution over the last few hundred to 1000 years is scant. This chapter outlines the climatic and non-climatic factors influencing relative sea-level (RSL) change, and discusses the advancements in Late Holocene studies that are enabling a multi-decadal to centennial examination of coastal evolution and the influence of sea-level changes over the 2000 years. High-resolution proxy sea-level data are being interpreted from fixed biological indicators, such as intertidal coral microatolls and encrusting tubeworms and barnacles together with saltmarsh and chenier sedimentary sequences. Three case studies on the resolution of last millennial sea-level and climate changes are presented for the Southwest Pacific Ocean, South Atlantic coast of South Africa, and the northeast Atlantic Ocean coastline of USA. A fourth case study is presented on the application of multicentennial coral δ18O derived sea-surface temperature (SST) time-series to temporally extending RSL trends from tide-gauge measurements. Broadly, the recent studies described above depict some agreement in regional sea-level history between oceanic regions; however, each region displays a characteristic signal. There is considerable evidence from both the northern and southern hemispheres that sea-level was at least 0.2-0.5 m lower than late 20th century sealevel during the period AD 1400-1850 (including the Little Ice Age). Estimates of higher sea-level during the prior period AD 700-1300 are less regionally consistent in both hemispheres, and in the southern hemisphere, may principally reflect the influence of the post-glacial global isostatic adjustment processes, rather than climatic factors alone. This general hypothesis requires rigorous examination using developing highresolution palaeo-methods in both coastal evolution and palaeoceanographic studies.

Original languageEnglish
Title of host publicationGlobal Change in the Holocene
EditorsAnson Mackay, Rick Battarbee, John Birks, Frank Oldfield
Place of PublicationAbigndon, UK; New York
PublisherRoutledge, Taylor and Francis Group
Pages406-421
Number of pages16
ISBN (Electronic)9780203785027, 9781444119176
ISBN (Print)9780340762233
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • Climate
  • Late Holocene
  • Microatoll
  • Saltmarsh
  • Sea-level
  • Sea-surface temperature

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  • Cite this

    Goodwin, I. D. (2005). Unravelling climatic influences on late Holocene sea-level variability. In A. Mackay, R. Battarbee, J. Birks, & F. Oldfield (Eds.), Global Change in the Holocene (pp. 406-421). Abigndon, UK; New York: Routledge, Taylor and Francis Group. https://doi.org/10.4324/9780203785027