Armelle Ballian, Maud J. M. Meijers, Isabelle Cojan, Damien Huyghe, Miguel Bernecker, Katharina Methner, Mattia Tagliavento, Jens Fiebig, Andreas Mulch
{"title":"北地中海地区中新世气候演变(法国东南部迪涅-瓦伦索莱盆地)","authors":"Armelle Ballian, Maud J. M. Meijers, Isabelle Cojan, Damien Huyghe, Miguel Bernecker, Katharina Methner, Mattia Tagliavento, Jens Fiebig, Andreas Mulch","doi":"10.5194/egusphere-2024-2093","DOIUrl":null,"url":null,"abstract":"<strong>Abstract.</strong> During the Middle Miocene, the Earth shifted from a warm state, the Miocene Climatic Optimum (MCO, 16.9–14.7 Ma), to a colder state associated with the formation of extensive and permanent ice sheets on Antarctica. This climatic shift, the Middle Miocene Climatic Transition (MMCT, 14.7–13.8 Ma) strongly affected the composition and structure of major biomes, ocean circulation, as well as precipitation patterns. Although Middle Miocene climate dynamics are well documented in marine records, our knowledge of terrestrial climate change is not well constrained. Here we present a long-term (23–13 Ma) stable (𝛿<sup>13</sup>C, 𝛿<sup>18</sup>O) and clumped (∆<sub>47</sub>) isotope record of soil carbonates from a northern Mediterranean Alpine foreland basin (Digne-Valensole Basin, France). ∆<sub>47</sub>-derived soil carbonate formation temperatures indicate a highly dynamic dry season temperature pattern that is consistent with multiple periods of reorganization of atmospheric circulation during the MCO. We propose that changes in atmospheric circulation patterns modified the seasonality of precipitation and, ultimately, the timing of pedogenic carbonate formation. Consequently, ∆<sub>47</sub> soil carbonate temperature data record the combined effects of long-term regional temperature and carbonate formation seasonality change. The data are consistent with the existence of a proto-Mediterranean climate already during certain MCO time intervals. Following the MMCT, the stable and clumped isotope record displays pronounced cooling after 13.8 Ma accompanied by a rather large (-5.0 %) decrease in soil water 𝛿<sup>18</sup>O values. Our northern Mediterranean foreland basin climate record shares strong similarities with time-equivalent records from the terrestrial European mid-latitudes and the global oceans and enhances our understanding of the circum-Alpine Middle Miocene terrestrial climate dynamics.","PeriodicalId":10332,"journal":{"name":"Climate of The Past","volume":"7 1","pages":""},"PeriodicalIF":3.8000,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Middle Miocene climate evolution in the Northern Mediterranean region (Digne-Valensole basin, SE France)\",\"authors\":\"Armelle Ballian, Maud J. M. Meijers, Isabelle Cojan, Damien Huyghe, Miguel Bernecker, Katharina Methner, Mattia Tagliavento, Jens Fiebig, Andreas Mulch\",\"doi\":\"10.5194/egusphere-2024-2093\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<strong>Abstract.</strong> During the Middle Miocene, the Earth shifted from a warm state, the Miocene Climatic Optimum (MCO, 16.9–14.7 Ma), to a colder state associated with the formation of extensive and permanent ice sheets on Antarctica. This climatic shift, the Middle Miocene Climatic Transition (MMCT, 14.7–13.8 Ma) strongly affected the composition and structure of major biomes, ocean circulation, as well as precipitation patterns. Although Middle Miocene climate dynamics are well documented in marine records, our knowledge of terrestrial climate change is not well constrained. Here we present a long-term (23–13 Ma) stable (𝛿<sup>13</sup>C, 𝛿<sup>18</sup>O) and clumped (∆<sub>47</sub>) isotope record of soil carbonates from a northern Mediterranean Alpine foreland basin (Digne-Valensole Basin, France). ∆<sub>47</sub>-derived soil carbonate formation temperatures indicate a highly dynamic dry season temperature pattern that is consistent with multiple periods of reorganization of atmospheric circulation during the MCO. We propose that changes in atmospheric circulation patterns modified the seasonality of precipitation and, ultimately, the timing of pedogenic carbonate formation. Consequently, ∆<sub>47</sub> soil carbonate temperature data record the combined effects of long-term regional temperature and carbonate formation seasonality change. The data are consistent with the existence of a proto-Mediterranean climate already during certain MCO time intervals. Following the MMCT, the stable and clumped isotope record displays pronounced cooling after 13.8 Ma accompanied by a rather large (-5.0 %) decrease in soil water 𝛿<sup>18</sup>O values. 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Middle Miocene climate evolution in the Northern Mediterranean region (Digne-Valensole basin, SE France)
Abstract. During the Middle Miocene, the Earth shifted from a warm state, the Miocene Climatic Optimum (MCO, 16.9–14.7 Ma), to a colder state associated with the formation of extensive and permanent ice sheets on Antarctica. This climatic shift, the Middle Miocene Climatic Transition (MMCT, 14.7–13.8 Ma) strongly affected the composition and structure of major biomes, ocean circulation, as well as precipitation patterns. Although Middle Miocene climate dynamics are well documented in marine records, our knowledge of terrestrial climate change is not well constrained. Here we present a long-term (23–13 Ma) stable (𝛿13C, 𝛿18O) and clumped (∆47) isotope record of soil carbonates from a northern Mediterranean Alpine foreland basin (Digne-Valensole Basin, France). ∆47-derived soil carbonate formation temperatures indicate a highly dynamic dry season temperature pattern that is consistent with multiple periods of reorganization of atmospheric circulation during the MCO. We propose that changes in atmospheric circulation patterns modified the seasonality of precipitation and, ultimately, the timing of pedogenic carbonate formation. Consequently, ∆47 soil carbonate temperature data record the combined effects of long-term regional temperature and carbonate formation seasonality change. The data are consistent with the existence of a proto-Mediterranean climate already during certain MCO time intervals. Following the MMCT, the stable and clumped isotope record displays pronounced cooling after 13.8 Ma accompanied by a rather large (-5.0 %) decrease in soil water 𝛿18O values. Our northern Mediterranean foreland basin climate record shares strong similarities with time-equivalent records from the terrestrial European mid-latitudes and the global oceans and enhances our understanding of the circum-Alpine Middle Miocene terrestrial climate dynamics.
期刊介绍:
Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope.
The main subject areas are the following:
reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives;
development and validation of new proxies, improvements of the precision and accuracy of proxy data;
theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales;
simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.