Low-frequency storminess signal at Bermuda linked to cooling events in the North Atlantic region
van Hengstum, Peter J.
Donnelly, Jeffrey P.
Kingston, Andrew W.
Williams, Bruce E.
Scott, David B.
Reinhardt, Eduard G.
Little, Shawna N.
Patterson, William P.
MetadataShow full item record
North Atlantic climate archives provide evidence for increased storm activity during the Little Ice Age (150 to 600 calibrated years (cal years) B.P.) and centered at 1700 and 3000 cal years B.P., typically in centennial-scale sedimentary records. Meteorological (tropical versus extratropical storms) and climate forcings of this signal remain poorly understood, although variability in the North Atlantic Oscillation (NAO) or Atlantic Meridional Overturning Circulation (AMOC) are frequently hypothesized to be involved. Here we present records of late Holocene storminess and coastal temperature change from a Bermudian submarine cave that is hydrographically circulated with the coastal ocean. Thermal variability in the cave is documented by stable oxygen isotope values of cave benthic foraminifera, which document a close linkage between regional temperature change and NAO phasing during the late Holocene. However, erosion of terrestrial sediment into the submarine cave provides a “storminess signal” that correlates with higher-latitude storminess archives and broader North Atlantic cooling events. Understanding the driver of this storminess signal will require higher-resolution storm records to disentangle the contribution of tropical versus extratropical cyclones and a better understanding of cyclone activity during hemispheric cooling periods. Most importantly, however, the signal in Bermuda appears more closely correlated with proxy-based evidence for subtle AMOC reductions than NAO phasing.
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 30 (2015): 52–76, doi:10.1002/2014PA002662.
Showing items related by title, author, creator and subject.
Cruise Report C-138 : scientific activities undertaken aboard SSV Corwith Cramer, Miami, Florida - Bermuda - Dominican Republic - Miami, Florida, 23 March to 1 May 1995 Howard, William R. (SEA Education Association, 1995-05)This report outlines the scientific and academic program conducted aboard SSV Corwith Cramer during March and April, 1995. It consists of summaries of research stations occupied, data collected, and highlights some of ...
Goodkin, Nathalie F.; Hughen, Konrad A.; Curry, William B.; Doney, Scott C.; Ostermann, Dorinda R. (American Geophysical Union, 2008-07-09)We use geochemical and isotope measurements on a 225-year old brain coral (Diploria labyrinthiformis) from the south shore of Bermuda (64°W, 32°N) to construct a record of decadal-to-centennial-scale climate variability. ...
Rates of vertical mixing, gas exchange, and new production : estimates from seasonal gas cycles in the upper ocean near Bermuda Spitzer, William S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1989-06)Argon measurements, obtained from three years of monthly detailed vertical profiles near Bermuda (Station S, 32°N 64°W), show a maximum in argon supersaturation of about 4% in the seasonal thermocline in late summer. ...