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        <gco:CharacterString>STUDY NOTES: Oxygen and nitrogen isotope data measured in Arctica islandica (ocean quahog) shells collected from the western Gulf of Maine and crossdated into a chronology that extends back to 1762 C.E., with individual shells dated back to the late 1600s. The chronology data can be found here: https://www.ncei.noaa.gov/access/paleo-search/study/19563. These data also appear in publication along with a radiocarbon record that has previously been archived on the NCEI NOAA WDS for Paleoclimatology here: https://www.ncei.noaa.gov/access/paleo-search/study/31392. The nitrogen isotope data dated after 1925 C.E. have previously been archived on NCEI NOAA WDS for Paleoclimatology here: https://www.ncei.noaa.gov/access/paleo-search/study/29292 Provided Keywords: Atlantic Meridional Overturning Circulation, Arctica islandica 
ABSTRACT SUPPLIED BY ORIGINATOR: The Gulf of Maine, located in the western North Atlantic, has undergone recent, rapid ocean warming but the lack of long-term, instrumental records hampers the ability to put these significant hydrographic changes into context. Here we present multiple 300-year long geochemical records (oxygen, nitrogen and previously published radiocarbon isotopes) measured in absolutely-dated Arctica islandica shells from the western Gulf of Maine. These records, in combination with climate model simulations, suggest that the Gulf of Maine underwent a long-term cooling over the last 1000 years, driven primarily by volcanic forcing and North Atlantic ocean dynamics. This cooling trend was reversed by warming beginning in the late 1800s, likely due to increased atmospheric greenhouse gas concentrations and changes in western North Atlantic circulation. The climate model simulations suggest that the warming over the last century was more rapid than almost any other 100-year period in the last 1000 years in the region.</gco:CharacterString>
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