Last glacial millennial-scale hydro-climate and temperature changes in Puerto Rico constrained by speleothem fluid inclusion δ18 and δ2H values
<p><strong class="journal-contentHeaderColor">Abstract.</strong> We present speleothem fluid inclusion <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>f</sub...
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| Hauptverfasser: | , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
1 February 2022
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| In: |
Climate of the past
Year: 2022, Jahrgang: 18, Heft: 1, Pages: 167-181 |
| ISSN: | 1814-9332 |
| DOI: | 10.5194/cp-18-167-2022 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.5194/cp-18-167-2022 Verlag, kostenfrei, Volltext: https://cp.copernicus.org/articles/18/167/2022/ 
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| Verfasserangaben: | Sophie F. Warken, Therese Weißbach, Tobias Kluge, Hubert Vonhof, Denis Scholz, Rolf Vieten, Martina Schmidt, Amos Winter, and Norbert Frank |
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| 245 | 1 | 0 | |a Last glacial millennial-scale hydro-climate and temperature changes in Puerto Rico constrained by speleothem fluid inclusion δ18 and δ2H values |c Sophie F. Warken, Therese Weißbach, Tobias Kluge, Hubert Vonhof, Denis Scholz, Rolf Vieten, Martina Schmidt, Amos Winter, and Norbert Frank |
| 246 | 3 | 3 | |a Last glacial millennial-scale hydro-climate and temperature changes in Puerto Rico constrained by speleothem fluid inclusion [delta] 18 and [delta] 2 H values |
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| 520 | |a <p><strong class="journal-contentHeaderColor">Abstract.</strong> We present speleothem fluid inclusion <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>f</sub></span> and <span class="inline-formula"><i>δ</i><sup>2</sup></span>H<span class="inline-formula"><sub>f</sub></span> values from Larga Cave, Puerto Rico, that cover the interval between 46.2 and 15.3 ka on the millennial scale, including the Last Glacial Maximum (LGM) and several stadial and interstadial cycles. The data set can be divided in two main clusters of stable isotope compositions of the fluid inclusion water with respect to the global meteoric water line (GMWL), which coincide with strong variations in the water content of the stalagmite. In particular, this clustering is found to be climate related, where one cluster comprises samples from cold and dry periods, such as the Heinrich and Greenland stadials (HSs and GSs), as well as parts of the LGM, which exhibit very high <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>f</sub></span> and <span class="inline-formula"><i>δ</i><sup>2</sup></span>H<span class="inline-formula"><sub>f</sub></span> values. We interpret this enrichment as being caused by evaporation inside the cave due to enhanced cave ventilation during these colder and drier times. In contrast, in most samples corresponding to warmer and wetter Greenland interstadials (GIs), but also for some from HS 2 and 3, the <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>f</sub></span> and <span class="inline-formula"><i>δ</i><sup>2</sup></span>H<span class="inline-formula"><sub>f</sub></span> values plot on the meteoric water line and modification of fluid inclusion water due to “in-cave” evaporation are found to be negligible.</p> <p>Consequently, variations of recent glacial hydro-climate and temperatures in the western tropical Atlantic can be constrained. In general, <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>f</sub></span> values from fluid inclusions are up to 3 ‰ higher than those of modern drip water, which is interpreted as a weaker atmospheric convective activity during the last glacial period. In addition, reconstructed temperatures suggest an average cooling of 2-3 <span class="inline-formula"><sup>∘</sup></span>C during the LGM compared to modern cave temperatures. Reconstructed cave temperatures yield an average cooling of <span class="inline-formula">−</span>1.4 <span class="inline-formula">±</span> 2.8 <span class="inline-formula"><sup>∘</sup></span>C for HS 2 and <span class="inline-formula">−</span>3.6 <span class="inline-formula">±</span> 2.2 <span class="inline-formula"><sup>∘</sup></span>C for HS 3. Higher <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>f</sub></span> values of these samples further suggest that the drip water was dominated by orographic rainfall and/or cold fronts, along with weak or even absent convective activity. In contrast, during interstadial phases, reconstructed temperatures reached nearly modern values, and convective activity was comparable to or only slightly weaker than today.</p> | ||
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