<mods:mods xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ID="omara" xsi:schemaLocation="http://www.loc.gov/mods/v3 http://www.loc.gov/mods/v3/mods-3-6.xsd">
      <mods:title>Reconstructing natural modes of Pacific climate variability by geochemical
         analysis of ocean sediment off Baja California, Mexico</mods:title>
   <mods:name type="personal">
      <mods:namePart>O'Mara, Nicholas</mods:namePart>
         <mods:roleTerm type="text">creator</mods:roleTerm>
   <mods:name type="personal">
      <mods:namePart>Herbert, Timothy</mods:namePart>
         <mods:roleTerm type="text">advisor</mods:roleTerm>
      <mods:affiliation>Brown University. Department of Earth, Environmental and Planetary
   <mods:typeOfResource>still image</mods:typeOfResource>
   <mods:genre authority="aat" usage="primary">posters</mods:genre>
         <mods:placeTerm type="text">Providence</mods:placeTerm>
      <mods:publisher>Brown University</mods:publisher>
      <mods:dateCreated keyDate="yes" encoding="w3cdtf">2015-08-07</mods:dateCreated>
      <mods:extent supplied="yes">1 poster</mods:extent>
      <mods:digitalOrigin>reformatted digital</mods:digitalOrigin>
   <mods:language usage="primary">
   <mods:abstract>The Pacific Ocean plays a key role in controlling natural periodic changes in
      regional and global climate. Physical couplings between the oceanic and the atmospheric
      systems result in variations in local sea surface temperature (SST), coastal marine
      productivity, and global heat distribution. The El NiƱo Southern Oscillation (ENSO) and the
      Pacific Decadal Oscillation (PDO) are two of these forms of physical coupling variability, or
      modes, that have significant climatic effects on interannual and decadal timescales,
      respectively. In order to understand how these phenomena have changed over Earth's history, we
      must supplement and extend the modern record of SST back in time using paleotemperature
      proxies. In this study, we analyzed organic compounds called alkenones produced by Emiliania
      huxleyi, a type of marine algae. The ratio of alkenones produced that contain two double bonds
      to those that contain three double bonds has been shown to correlate linearly with the algal
      growth temperature. When these algae die, they sink to the bottom and the alkenones are
      preserved in in the sediment. Using sediment cored off the coast of Baja California, Mexico,
      an area that has been shown to be strongly influenced by both ENSO and PDO, and we performed
      chemical analysis by gas chromatography in order to quantify the alkenone ratio and establish
      an SST record for this region. Additionally, we used the total amount of alkenones as a proxy
      for regional productivity. Our inferred record is consistent with the historical record for
      the region and demonstrates the influence ENSO and PDO have on the coastal SST and
      productivity. These results give us confidence in the use of this method to sample deeper,
      pushing further back in time beyond the limits of historical data to establish a long-term
      paleoclimate record for the region, which could elucidate how ENSO and PDO have varied in the
      past under various global climatic conditions, century to century. </mods:abstract>
   <mods:subject authority="lcsh">
   <mods:subject authority="lcsh">
      <mods:topic>Pacific Ocean</mods:topic>
   <mods:subject authority="lcsh">
<mods:identifier xmlns:xlink="http://www.w3.org/1999/xlink" type="doi">10.26300/t47v-gn19</mods:identifier></mods:mods>