Ring Index: A new strategy to evaluate the integrity of TEX86 paleothermometry
The TEX86 (tetraether index of 86 carbon atoms) sea surface temperature proxy has been increasingly applied in the reconstruction of Mesozoic and Cenozoic ocean temperatures. However, the archaeal lipids that compose TEX86 indices, glycerol dialkyl glycerol tetraethers (GDGTs), can derive from water...
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Veröffentlicht in: | Paleoceanography 2016-02, Vol.31 (2), p.220-232 |
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description | The TEX86 (tetraether index of 86 carbon atoms) sea surface temperature proxy has been increasingly applied in the reconstruction of Mesozoic and Cenozoic ocean temperatures. However, the archaeal lipids that compose TEX86 indices, glycerol dialkyl glycerol tetraethers (GDGTs), can derive from water column production, terrestrial sources, and/or within sediments. TEX86‐sea surface temperature estimates can also be influenced by non‐temperature factors, such as growth phase and nutrient levels. Here we show that the weighted average of cyclopentane moieties, known as the Ring Index (RI), can be used to determine if TEX86 temperature estimates are influenced by non‐thermal factors and/or deviate from modern analogues. We demonstrate that RI and TEX86 indices from the published global core top data set and mesocosm cultures are significantly correlated, as predicted through the influence of temperature on lipid biochemistry. We further show that when RI and TEX86 indices in modern or ancient records deviate from the modern global TEX86‐RI relationship, GDGT distributions are not solely controlled by environmental temperature and/or TEX86‐based temperature reconstructions are questionable.
Key Points
Ring Index is a new tool to evaluate the quality of TEX86‐based ocean temperature reconstructions
Ring Index can identify GDGT distributions that are impacted by non‐temperature factors
Ring Index complements the existing indices like BIT and Methane Index |
doi_str_mv | 10.1002/2015PA002848 |
format | Article |
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Key Points
Ring Index is a new tool to evaluate the quality of TEX86‐based ocean temperature reconstructions
Ring Index can identify GDGT distributions that are impacted by non‐temperature factors
Ring Index complements the existing indices like BIT and Methane Index</description><identifier>ISSN: 0883-8305</identifier><identifier>ISSN: 2572-4517</identifier><identifier>EISSN: 1944-9186</identifier><identifier>EISSN: 2572-4525</identifier><identifier>DOI: 10.1002/2015PA002848</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Cenozoic ; GDGTs ; Glycerol ; Lipids ; Mesozoic ; Ocean temperature ; paleotemperatures ; Ring Index ; Sea surface temperature ; TEX86 ; Water column</subject><ispartof>Paleoceanography, 2016-02, Vol.31 (2), p.220-232</ispartof><rights>2015. American Geophysical Union. All Rights Reserved.</rights><rights>2016. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2015PA002848$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2015PA002848$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,1427,11493,27901,27902,45550,45551,46384,46443,46808,46867</link.rule.ids></links><search><creatorcontrib>Zhang, Yi Ge</creatorcontrib><creatorcontrib>Pagani, Mark</creatorcontrib><creatorcontrib>Wang, Zhengrong</creatorcontrib><title>Ring Index: A new strategy to evaluate the integrity of TEX86 paleothermometry</title><title>Paleoceanography</title><description>The TEX86 (tetraether index of 86 carbon atoms) sea surface temperature proxy has been increasingly applied in the reconstruction of Mesozoic and Cenozoic ocean temperatures. However, the archaeal lipids that compose TEX86 indices, glycerol dialkyl glycerol tetraethers (GDGTs), can derive from water column production, terrestrial sources, and/or within sediments. TEX86‐sea surface temperature estimates can also be influenced by non‐temperature factors, such as growth phase and nutrient levels. Here we show that the weighted average of cyclopentane moieties, known as the Ring Index (RI), can be used to determine if TEX86 temperature estimates are influenced by non‐thermal factors and/or deviate from modern analogues. We demonstrate that RI and TEX86 indices from the published global core top data set and mesocosm cultures are significantly correlated, as predicted through the influence of temperature on lipid biochemistry. We further show that when RI and TEX86 indices in modern or ancient records deviate from the modern global TEX86‐RI relationship, GDGT distributions are not solely controlled by environmental temperature and/or TEX86‐based temperature reconstructions are questionable.
Key Points
Ring Index is a new tool to evaluate the quality of TEX86‐based ocean temperature reconstructions
Ring Index can identify GDGT distributions that are impacted by non‐temperature factors
Ring Index complements the existing indices like BIT and Methane Index</description><subject>Cenozoic</subject><subject>GDGTs</subject><subject>Glycerol</subject><subject>Lipids</subject><subject>Mesozoic</subject><subject>Ocean temperature</subject><subject>paleotemperatures</subject><subject>Ring Index</subject><subject>Sea surface temperature</subject><subject>TEX86</subject><subject>Water column</subject><issn>0883-8305</issn><issn>2572-4517</issn><issn>1944-9186</issn><issn>2572-4525</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNpNkE9Lw0AQxRdRsFZvfoAFz9GZ_dNsvIVStVBskQrelrWZ1JQ0qZutNd_elXrwNDPvPX4Dj7FrhFsEEHcCUC_yuBllTtgAM6WSDM3olA3AGJkYCfqcXXTdBgCVHskBe36pmjWfNgV93_OcN3TgXfAu0LrnoeX05ep9vHj4IF41UfZV6Hlb8uXkzYz4ztXURs9v2y0F31-ys9LVHV39zSF7fZgsx0_JbP44HeezZKMARYJAhUhVKoxZZQQgtV4ZIQq9kk4IUqigoFRAWqry3aArlAahDZZYaJMhyCG7OXJ3vv3cUxfspt37Jr60mEYsKGlUTMlj6lDV1Nudr7bO9xbB_tZl_9dlF_lsLkBkQv4ADKZcXQ</recordid><startdate>201602</startdate><enddate>201602</enddate><creator>Zhang, Yi Ge</creator><creator>Pagani, Mark</creator><creator>Wang, Zhengrong</creator><general>Blackwell Publishing Ltd</general><scope>7SN</scope><scope>7TG</scope><scope>7TN</scope><scope>C1K</scope><scope>F1W</scope><scope>H95</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope></search><sort><creationdate>201602</creationdate><title>Ring Index: A new strategy to evaluate the integrity of TEX86 paleothermometry</title><author>Zhang, Yi Ge ; Pagani, Mark ; Wang, Zhengrong</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-j4012-10ed2747288c9e00355c822d5c3a22e4140de7207f4fb81ad4502581f1d589103</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Cenozoic</topic><topic>GDGTs</topic><topic>Glycerol</topic><topic>Lipids</topic><topic>Mesozoic</topic><topic>Ocean temperature</topic><topic>paleotemperatures</topic><topic>Ring Index</topic><topic>Sea surface temperature</topic><topic>TEX86</topic><topic>Water column</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Yi Ge</creatorcontrib><creatorcontrib>Pagani, Mark</creatorcontrib><creatorcontrib>Wang, Zhengrong</creatorcontrib><collection>Ecology Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Paleoceanography</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Yi Ge</au><au>Pagani, Mark</au><au>Wang, Zhengrong</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ring Index: A new strategy to evaluate the integrity of TEX86 paleothermometry</atitle><jtitle>Paleoceanography</jtitle><date>2016-02</date><risdate>2016</risdate><volume>31</volume><issue>2</issue><spage>220</spage><epage>232</epage><pages>220-232</pages><issn>0883-8305</issn><issn>2572-4517</issn><eissn>1944-9186</eissn><eissn>2572-4525</eissn><abstract>The TEX86 (tetraether index of 86 carbon atoms) sea surface temperature proxy has been increasingly applied in the reconstruction of Mesozoic and Cenozoic ocean temperatures. However, the archaeal lipids that compose TEX86 indices, glycerol dialkyl glycerol tetraethers (GDGTs), can derive from water column production, terrestrial sources, and/or within sediments. TEX86‐sea surface temperature estimates can also be influenced by non‐temperature factors, such as growth phase and nutrient levels. Here we show that the weighted average of cyclopentane moieties, known as the Ring Index (RI), can be used to determine if TEX86 temperature estimates are influenced by non‐thermal factors and/or deviate from modern analogues. We demonstrate that RI and TEX86 indices from the published global core top data set and mesocosm cultures are significantly correlated, as predicted through the influence of temperature on lipid biochemistry. We further show that when RI and TEX86 indices in modern or ancient records deviate from the modern global TEX86‐RI relationship, GDGT distributions are not solely controlled by environmental temperature and/or TEX86‐based temperature reconstructions are questionable.
Key Points
Ring Index is a new tool to evaluate the quality of TEX86‐based ocean temperature reconstructions
Ring Index can identify GDGT distributions that are impacted by non‐temperature factors
Ring Index complements the existing indices like BIT and Methane Index</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2015PA002848</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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source | Wiley Free Content; Wiley-Blackwell AGU Digital Library; Wiley Online Library Journals Frontfile Complete |
subjects | Cenozoic GDGTs Glycerol Lipids Mesozoic Ocean temperature paleotemperatures Ring Index Sea surface temperature TEX86 Water column |
title | Ring Index: A new strategy to evaluate the integrity of TEX86 paleothermometry |
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