Sclerochronological evidence of pronounced seasonality from the late Pliocene of the southern North Sea basin and its implications

Publication type:
Journal article
Metadata:
Autoren
  • Andrew LA Johnson
  • Annemarie M Valentine
  • Bernd R Schoene
  • Melanie J Leng
  • Stijn Goolaerts
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000802162000001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/cp-18-1203-2022
eISSN
1814-9332
Externe Identifier
  • Clarivate Analytics Document Solution ID: 1P7CG
ISSN
1814-9324
Ausgabe der Veröffentlichung
5
Zeitschrift
CLIMATE OF THE PAST
Paginierung
1203 - 1229
Datum der Veröffentlichung
2022
Status
Published
Titel
Sclerochronological evidence of pronounced seasonality from the late Pliocene of the southern North Sea basin and its implications
Sub types
  • Article
Ausgabe der Zeitschrift
18

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:p>Abstract. Oxygen isotope (δ18O) sclerochronology of benthic marine molluscs provides a means of reconstructing the seasonal range in seafloor temperature, subject to use of an appropriate equation relating shell δ18O to temperature and water δ18O, a reasonably accurate estimation of water δ18O, and due consideration of growth-rate effects. Taking these factors into account, δ18O data from late Pliocene bivalves of the southern North Sea basin (Belgium and the Netherlands) indicate a seasonal seafloor range a little smaller than now in the area. Microgrowth-increment data from Aequipecten opercularis, together with the species composition of the bivalve assemblage and aspects of preservation, suggest a setting below the summer thermocline for all but the latest material investigated. This implies a higher summer temperature at the surface than on the seafloor and consequently a greater seasonal range. A reasonable (3 ∘C) estimate of the difference between maximum seafloor and surface temperature under circumstances of summer stratification points to seasonal surface ranges in excess of the present value (12.4 ∘C nearby). Using a model-derived estimate of water δ18O (0.0 ‰), summer surface temperature was initially in the cool temperate range (&lt;20 ∘C) and then (during the Mid-Piacenzian Warm Period; MPWP) increased into the warm temperate range (&gt;20 ∘C) before reverting to cool temperate values (in conjunction with shallowing and a loss of summer stratification). This pattern is in agreement with biotic-assemblage evidence. Winter temperature was firmly in the cool temperate range (&lt;10 ∘C) throughout, contrary to previous interpretations. Averaging of summer and winter surface temperatures for the MPWP provides a figure for annual sea surface temperature that is 2–3 ∘C higher than the present value (10.9 ∘C nearby) and in close agreement with a figure obtained by averaging alkenone and TEX86 temperatures for the MPWP from the Netherlands. These proxies, however, respectively, underestimate summer temperature and overestimate winter temperature, giving an incomplete picture of seasonality. A higher annual temperature than now is consistent with the notion of global warmth in the MPWP, but a low winter temperature in the southern North Sea basin suggests regional reduction in oceanic heat supply, contrasting with other interpretations of North Atlantic oceanography during the interval. Carbonate clumped isotope (Δ47) and biomineral unit thermometry offer means of checking the δ18O-based temperatures. </jats:p>
Autoren
  • Andrew LA Johnson
  • Annemarie M Valentine
  • Bernd R Schöne
  • Melanie J Leng
  • Stijn Goolaerts
DOI
10.5194/cp-18-1203-2022
eISSN
1814-9332
Ausgabe der Veröffentlichung
5
Zeitschrift
Climate of the Past
Sprache
en
Online publication date
2022
Paginierung
1203 - 1229
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/cp-18-1203-2022
Datum der Datenerfassung
2022
Titel
Sclerochronological evidence of pronounced seasonality from the late Pliocene of the southern North Sea basin and its implications
Ausgabe der Zeitschrift
18

Data source: Crossref

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