Environmental control of the oxygen isotope composition of Porites coral microatolls
Understanding the influence of climatic and non-climatic factors on geochemical signals in corals is critical for assessing coral-derived records of tropical climate variability. Porites microatolls form large, disk-shaped colonies constrained in their upward growth by exposure at or close to mean s...
Gespeichert in:
| Veröffentlicht in: | Geochimica et cosmochimica acta 2011-07, Vol.75 (14), p.3930-3944 |
|---|---|
| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| container_end_page | 3944 |
|---|---|
| container_issue | 14 |
| container_start_page | 3930 |
| container_title | Geochimica et cosmochimica acta |
| container_volume | 75 |
| creator | McGregor, H.V. Fischer, M.J. Gagan, M.K. Fink, D. Woodroffe, C.D. |
| description | Understanding the influence of climatic and non-climatic factors on geochemical signals in corals is critical for assessing coral-derived records of tropical climate variability.
Porites microatolls form large, disk-shaped colonies constrained in their upward growth by exposure at or close to mean spring low water level, and occur on Indo-Pacific reefs. Microatolls appear suitable for paleoclimate reconstruction, however the systematics of the microatoll chemistry–climate relationship are yet to be characterized. In this study, the δ
18O signal in
Porites microatolls from well-flushed reef flats on Kiritimati (Christmas) Island, central Pacific was investigated for intra-coral (growth aspect and extension rate effects) and between-coral effects, and to explore the climate signal contained within their skeletons. Samples for δ
18O analysis were taken from six individual transects from different positions within
Porites microatoll XM22. The results show that: (1) the average standard deviation for the mean δ
18O values of transects that represent the same time periods is 0.03‰, and is within measurement error for a single analysis (0.04‰); (2) the average standard deviation for time-equivalent, near-monthly samples along the transects within the same microatoll is 0.07‰ and; (3) comparison of the average δ
18O values of records for different microatolls from across Kiritimati Island show only a small between-coral differences of 0.04‰ and 0.11‰ for different time periods. These differences in mean δ
18O are within the range for intra- and inter-colony differences in seasonal and interannual δ
18O reported for dome-shaped
Porites. Based on these results, a stacked microatoll δ
18O record was constructed for the period 1978–2007 for comparison with published coral δ
18O records for nearby dome-shaped
Porites. There is a systematic offset between the two types of records, which is probably due to variations in δ
18O seawater across Kiritimati Island. Despite the offset, all records show similar amplitudes for the seasonal-cycle of δ
18O, and there is a strong correlation (
r
=
−0.71) between microatoll δ
18O and local sea surface temperature (SST). The δ
18O-SST slope relationship for microatolls is −0.15‰/°C, very similar to that reported for fast-growing domed corals (−0.18‰ to −0.22‰/°C). Statistical analysis of the stacked microatoll δ
18O record shows that it is correlated with both local and large-scale climate variables (primarily SST) at semiannual, ann |
| doi_str_mv | 10.1016/j.gca.2011.04.017 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_889417594</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0016703711002389</els_id><sourcerecordid>889417594</sourcerecordid><originalsourceid>FETCH-LOGICAL-a409t-154ce4009b459e54d69e2ab894bfa0aac81668d2c7c8d7d2e4b99f39aa9304bd3</originalsourceid><addsrcrecordid>eNp9kF1LwzAUhoMoOKc_wCt7pzetJ23aNHglMj9goOB2HdL0dGa0zUyy4f69GfNazkXg5HlfOA8h1xQyCrS6X2crrbIcKM2AZUD5CZnQmuepKIvilEwgQimHgp-TC-_XAMDLEiZkMRt3xtlxwDGoPtF2DM72ie2S8IWJ_dmvcEyMt8FuMP4OG-tNMHY8EB_WmYA-rl2MDkY7q4Lte39JzjrVe7z6e6dk-TxbPL2m8_eXt6fHeaoYiJDSkmlkAKJhpcCStZXAXDW1YE2nQCld06qq21xzXbe8zZE1QnSFUEoUwJq2mJLbY-_G2e8t-iAH4zX2vRrRbr2sYxXlpWCRvPuXpLzKaRxWRZQe0XiO9w47uXFmUG4vKciDa7mW0bU8uJbAZHQdMzfHTKesVCtnvFx-RqCM2mlR5RCJhyOB0cfOoJNeGxw1tsahDrK15p_-X_ROkRg</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1762121246</pqid></control><display><type>article</type><title>Environmental control of the oxygen isotope composition of Porites coral microatolls</title><source>Elsevier ScienceDirect Journals Complete</source><creator>McGregor, H.V. ; Fischer, M.J. ; Gagan, M.K. ; Fink, D. ; Woodroffe, C.D.</creator><creatorcontrib>McGregor, H.V. ; Fischer, M.J. ; Gagan, M.K. ; Fink, D. ; Woodroffe, C.D.</creatorcontrib><description>Understanding the influence of climatic and non-climatic factors on geochemical signals in corals is critical for assessing coral-derived records of tropical climate variability.
Porites microatolls form large, disk-shaped colonies constrained in their upward growth by exposure at or close to mean spring low water level, and occur on Indo-Pacific reefs. Microatolls appear suitable for paleoclimate reconstruction, however the systematics of the microatoll chemistry–climate relationship are yet to be characterized. In this study, the δ
18O signal in
Porites microatolls from well-flushed reef flats on Kiritimati (Christmas) Island, central Pacific was investigated for intra-coral (growth aspect and extension rate effects) and between-coral effects, and to explore the climate signal contained within their skeletons. Samples for δ
18O analysis were taken from six individual transects from different positions within
Porites microatoll XM22. The results show that: (1) the average standard deviation for the mean δ
18O values of transects that represent the same time periods is 0.03‰, and is within measurement error for a single analysis (0.04‰); (2) the average standard deviation for time-equivalent, near-monthly samples along the transects within the same microatoll is 0.07‰ and; (3) comparison of the average δ
18O values of records for different microatolls from across Kiritimati Island show only a small between-coral differences of 0.04‰ and 0.11‰ for different time periods. These differences in mean δ
18O are within the range for intra- and inter-colony differences in seasonal and interannual δ
18O reported for dome-shaped
Porites. Based on these results, a stacked microatoll δ
18O record was constructed for the period 1978–2007 for comparison with published coral δ
18O records for nearby dome-shaped
Porites. There is a systematic offset between the two types of records, which is probably due to variations in δ
18O seawater across Kiritimati Island. Despite the offset, all records show similar amplitudes for the seasonal-cycle of δ
18O, and there is a strong correlation (
r
=
−0.71) between microatoll δ
18O and local sea surface temperature (SST). The δ
18O-SST slope relationship for microatolls is −0.15‰/°C, very similar to that reported for fast-growing domed corals (−0.18‰ to −0.22‰/°C). Statistical analysis of the stacked microatoll δ
18O record shows that it is correlated with both local and large-scale climate variables (primarily SST) at semiannual, annual and interannual timescales. Our results show that the signal reproducibility and fidelity of skeletal δ
18O in coral microatolls is comparable to that observed for more conventional coral growth forms. Longer-lived, and fossil,
Porites microatolls, where they have grown in suitably flushed environments, are likely to contain δ
18O signals that can significantly extend instrumental records of tropical climate variability.</description><identifier>ISSN: 0016-7037</identifier><identifier>EISSN: 1872-9533</identifier><identifier>DOI: 10.1016/j.gca.2011.04.017</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Climate ; climate change ; Corals ; fossils ; Islands ; isotopes ; oxygen ; paleoclimatology ; Reefs ; Samples ; seasonal variation ; seawater ; spring ; Standard deviation ; Statistical analysis ; Statistical methods ; surface water temperature ; tropics</subject><ispartof>Geochimica et cosmochimica acta, 2011-07, Vol.75 (14), p.3930-3944</ispartof><rights>2011</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a409t-154ce4009b459e54d69e2ab894bfa0aac81668d2c7c8d7d2e4b99f39aa9304bd3</citedby><cites>FETCH-LOGICAL-a409t-154ce4009b459e54d69e2ab894bfa0aac81668d2c7c8d7d2e4b99f39aa9304bd3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.gca.2011.04.017$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27929,27930,46000</link.rule.ids></links><search><creatorcontrib>McGregor, H.V.</creatorcontrib><creatorcontrib>Fischer, M.J.</creatorcontrib><creatorcontrib>Gagan, M.K.</creatorcontrib><creatorcontrib>Fink, D.</creatorcontrib><creatorcontrib>Woodroffe, C.D.</creatorcontrib><title>Environmental control of the oxygen isotope composition of Porites coral microatolls</title><title>Geochimica et cosmochimica acta</title><description>Understanding the influence of climatic and non-climatic factors on geochemical signals in corals is critical for assessing coral-derived records of tropical climate variability.
Porites microatolls form large, disk-shaped colonies constrained in their upward growth by exposure at or close to mean spring low water level, and occur on Indo-Pacific reefs. Microatolls appear suitable for paleoclimate reconstruction, however the systematics of the microatoll chemistry–climate relationship are yet to be characterized. In this study, the δ
18O signal in
Porites microatolls from well-flushed reef flats on Kiritimati (Christmas) Island, central Pacific was investigated for intra-coral (growth aspect and extension rate effects) and between-coral effects, and to explore the climate signal contained within their skeletons. Samples for δ
18O analysis were taken from six individual transects from different positions within
Porites microatoll XM22. The results show that: (1) the average standard deviation for the mean δ
18O values of transects that represent the same time periods is 0.03‰, and is within measurement error for a single analysis (0.04‰); (2) the average standard deviation for time-equivalent, near-monthly samples along the transects within the same microatoll is 0.07‰ and; (3) comparison of the average δ
18O values of records for different microatolls from across Kiritimati Island show only a small between-coral differences of 0.04‰ and 0.11‰ for different time periods. These differences in mean δ
18O are within the range for intra- and inter-colony differences in seasonal and interannual δ
18O reported for dome-shaped
Porites. Based on these results, a stacked microatoll δ
18O record was constructed for the period 1978–2007 for comparison with published coral δ
18O records for nearby dome-shaped
Porites. There is a systematic offset between the two types of records, which is probably due to variations in δ
18O seawater across Kiritimati Island. Despite the offset, all records show similar amplitudes for the seasonal-cycle of δ
18O, and there is a strong correlation (
r
=
−0.71) between microatoll δ
18O and local sea surface temperature (SST). The δ
18O-SST slope relationship for microatolls is −0.15‰/°C, very similar to that reported for fast-growing domed corals (−0.18‰ to −0.22‰/°C). Statistical analysis of the stacked microatoll δ
18O record shows that it is correlated with both local and large-scale climate variables (primarily SST) at semiannual, annual and interannual timescales. Our results show that the signal reproducibility and fidelity of skeletal δ
18O in coral microatolls is comparable to that observed for more conventional coral growth forms. Longer-lived, and fossil,
Porites microatolls, where they have grown in suitably flushed environments, are likely to contain δ
18O signals that can significantly extend instrumental records of tropical climate variability.</description><subject>Climate</subject><subject>climate change</subject><subject>Corals</subject><subject>fossils</subject><subject>Islands</subject><subject>isotopes</subject><subject>oxygen</subject><subject>paleoclimatology</subject><subject>Reefs</subject><subject>Samples</subject><subject>seasonal variation</subject><subject>seawater</subject><subject>spring</subject><subject>Standard deviation</subject><subject>Statistical analysis</subject><subject>Statistical methods</subject><subject>surface water temperature</subject><subject>tropics</subject><issn>0016-7037</issn><issn>1872-9533</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNp9kF1LwzAUhoMoOKc_wCt7pzetJ23aNHglMj9goOB2HdL0dGa0zUyy4f69GfNazkXg5HlfOA8h1xQyCrS6X2crrbIcKM2AZUD5CZnQmuepKIvilEwgQimHgp-TC-_XAMDLEiZkMRt3xtlxwDGoPtF2DM72ie2S8IWJ_dmvcEyMt8FuMP4OG-tNMHY8EB_WmYA-rl2MDkY7q4Lte39JzjrVe7z6e6dk-TxbPL2m8_eXt6fHeaoYiJDSkmlkAKJhpcCStZXAXDW1YE2nQCld06qq21xzXbe8zZE1QnSFUEoUwJq2mJLbY-_G2e8t-iAH4zX2vRrRbr2sYxXlpWCRvPuXpLzKaRxWRZQe0XiO9w47uXFmUG4vKciDa7mW0bU8uJbAZHQdMzfHTKesVCtnvFx-RqCM2mlR5RCJhyOB0cfOoJNeGxw1tsahDrK15p_-X_ROkRg</recordid><startdate>20110715</startdate><enddate>20110715</enddate><creator>McGregor, H.V.</creator><creator>Fischer, M.J.</creator><creator>Gagan, M.K.</creator><creator>Fink, D.</creator><creator>Woodroffe, C.D.</creator><general>Elsevier Ltd</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20110715</creationdate><title>Environmental control of the oxygen isotope composition of Porites coral microatolls</title><author>McGregor, H.V. ; Fischer, M.J. ; Gagan, M.K. ; Fink, D. ; Woodroffe, C.D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a409t-154ce4009b459e54d69e2ab894bfa0aac81668d2c7c8d7d2e4b99f39aa9304bd3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Climate</topic><topic>climate change</topic><topic>Corals</topic><topic>fossils</topic><topic>Islands</topic><topic>isotopes</topic><topic>oxygen</topic><topic>paleoclimatology</topic><topic>Reefs</topic><topic>Samples</topic><topic>seasonal variation</topic><topic>seawater</topic><topic>spring</topic><topic>Standard deviation</topic><topic>Statistical analysis</topic><topic>Statistical methods</topic><topic>surface water temperature</topic><topic>tropics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>McGregor, H.V.</creatorcontrib><creatorcontrib>Fischer, M.J.</creatorcontrib><creatorcontrib>Gagan, M.K.</creatorcontrib><creatorcontrib>Fink, D.</creatorcontrib><creatorcontrib>Woodroffe, C.D.</creatorcontrib><collection>AGRIS</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Geochimica et cosmochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>McGregor, H.V.</au><au>Fischer, M.J.</au><au>Gagan, M.K.</au><au>Fink, D.</au><au>Woodroffe, C.D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Environmental control of the oxygen isotope composition of Porites coral microatolls</atitle><jtitle>Geochimica et cosmochimica acta</jtitle><date>2011-07-15</date><risdate>2011</risdate><volume>75</volume><issue>14</issue><spage>3930</spage><epage>3944</epage><pages>3930-3944</pages><issn>0016-7037</issn><eissn>1872-9533</eissn><abstract>Understanding the influence of climatic and non-climatic factors on geochemical signals in corals is critical for assessing coral-derived records of tropical climate variability.
Porites microatolls form large, disk-shaped colonies constrained in their upward growth by exposure at or close to mean spring low water level, and occur on Indo-Pacific reefs. Microatolls appear suitable for paleoclimate reconstruction, however the systematics of the microatoll chemistry–climate relationship are yet to be characterized. In this study, the δ
18O signal in
Porites microatolls from well-flushed reef flats on Kiritimati (Christmas) Island, central Pacific was investigated for intra-coral (growth aspect and extension rate effects) and between-coral effects, and to explore the climate signal contained within their skeletons. Samples for δ
18O analysis were taken from six individual transects from different positions within
Porites microatoll XM22. The results show that: (1) the average standard deviation for the mean δ
18O values of transects that represent the same time periods is 0.03‰, and is within measurement error for a single analysis (0.04‰); (2) the average standard deviation for time-equivalent, near-monthly samples along the transects within the same microatoll is 0.07‰ and; (3) comparison of the average δ
18O values of records for different microatolls from across Kiritimati Island show only a small between-coral differences of 0.04‰ and 0.11‰ for different time periods. These differences in mean δ
18O are within the range for intra- and inter-colony differences in seasonal and interannual δ
18O reported for dome-shaped
Porites. Based on these results, a stacked microatoll δ
18O record was constructed for the period 1978–2007 for comparison with published coral δ
18O records for nearby dome-shaped
Porites. There is a systematic offset between the two types of records, which is probably due to variations in δ
18O seawater across Kiritimati Island. Despite the offset, all records show similar amplitudes for the seasonal-cycle of δ
18O, and there is a strong correlation (
r
=
−0.71) between microatoll δ
18O and local sea surface temperature (SST). The δ
18O-SST slope relationship for microatolls is −0.15‰/°C, very similar to that reported for fast-growing domed corals (−0.18‰ to −0.22‰/°C). Statistical analysis of the stacked microatoll δ
18O record shows that it is correlated with both local and large-scale climate variables (primarily SST) at semiannual, annual and interannual timescales. Our results show that the signal reproducibility and fidelity of skeletal δ
18O in coral microatolls is comparable to that observed for more conventional coral growth forms. Longer-lived, and fossil,
Porites microatolls, where they have grown in suitably flushed environments, are likely to contain δ
18O signals that can significantly extend instrumental records of tropical climate variability.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.gca.2011.04.017</doi><tpages>15</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0016-7037 |
| ispartof | Geochimica et cosmochimica acta, 2011-07, Vol.75 (14), p.3930-3944 |
| issn | 0016-7037 1872-9533 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_889417594 |
| source | Elsevier ScienceDirect Journals Complete |
| subjects | Climate climate change Corals fossils Islands isotopes oxygen paleoclimatology Reefs Samples seasonal variation seawater spring Standard deviation Statistical analysis Statistical methods surface water temperature tropics |
| title | Environmental control of the oxygen isotope composition of Porites coral microatolls |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-13T18%3A13%3A20IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Environmental%20control%20of%20the%20oxygen%20isotope%20composition%20of%20Porites%20coral%20microatolls&rft.jtitle=Geochimica%20et%20cosmochimica%20acta&rft.au=McGregor,%20H.V.&rft.date=2011-07-15&rft.volume=75&rft.issue=14&rft.spage=3930&rft.epage=3944&rft.pages=3930-3944&rft.issn=0016-7037&rft.eissn=1872-9533&rft_id=info:doi/10.1016/j.gca.2011.04.017&rft_dat=%3Cproquest_cross%3E889417594%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1762121246&rft_id=info:pmid/&rft_els_id=S0016703711002389&rfr_iscdi=true |