Last glacial millennial-scale hydro-climate and temperature changes in Puerto Rico constrained by speleothem fluid inclusion <italic>δ</italic><sup>18</sup>O and <italic>δ</italic><sup>2</sup>H values
Abstract δ 18 f and δ 2 f 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 δ 18 f and δ 2 f 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 δ 18 f and δ 2 f values plot on the meteoric water line and modification of fluid inclusion water due to “in-cave” evaporation are found to be negligible. δ 18 f 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 ∘ C during the LGM compared to modern cave temperatures. Reconstructed cave temperatures yield an average cooling of - ± ∘ C for HS 2 and - ± ∘ C for HS 3. Higher δ 18 f 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.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Last glacial millennial-scale hydro-climate and temperature changes in Puerto Rico constrained by speleothem fluid inclusion
δ 18O andδ 2H values ; volume:18 ; number:1 ; year:2022 ; pages:167-181 ; extent:15
Climate of the past ; 18, Heft 1 (2022), 167-181 (gesamt 15)
- Creator
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Warken, Sophie F.
Weißbach, Therese
Kluge, Tobias
Vonhof, Hubert
Scholz, Denis
Vieten, Rolf
Schmidt, Martina
Winter, Amos
Frank, Norbert
- DOI
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10.5194/cp-18-167-2022
- URN
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urn:nbn:de:101:1-2022020304170701296521
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:24 AM CEST
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Associated
- Warken, Sophie F.
- Weißbach, Therese
- Kluge, Tobias
- Vonhof, Hubert
- Scholz, Denis
- Vieten, Rolf
- Schmidt, Martina
- Winter, Amos
- Frank, Norbert
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