期刊
QUATERNARY SCIENCE REVIEWS
卷 29, 期 27-28, 页码 3983-3993出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2010.10.004
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资金
- National Science Foundation [EAR-0107650]
- American Chemical Society
Estuaries along the northern Gulf of Mexico show rapid landward shifts in estuarine environments (back-stepping) around 8200 cal yr BP. Paleogeographic maps of the estuaries based on seismic data and cores, and constrained chronologically by radiocarbon dates, depict bay-head delta retreat in excess of 25 m/yr. During these events the sub-aerial delta plain flooded to create sub-tidal upper- and middle-bay environments. Abrupt sea-level rise associated with the 8200 cal yr BP climate-change event caused these estuaries and others around the world to reorganize abruptly. In the northern Gulf of Mexico, the sea-level rise associated with the event was only similar to 0.1 m over a sub-decadal time period. This rise was superimposed on a background decelerating rate of sea-level rise of similar to 1.0-0.5 m/century. The widespread bay-head delta back-stepping, documented here, may be an appropriate analog for possible abrupt future climate change in response to global warming. It also shows that estuaries fringed by low-gradient shorelines are highly sensitive to low-amplitude and sudden sea-level rise. (C) 2010 Elsevier Ltd. All rights reserved.
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