Past oceanic characteristics can be reconstructed via δ
18
O in bivalve shells, enabling the study of climatic patterns that affected marine and human communities. Through the novel analysis of δ
18
O in
Pinctada mazatlanica
shells from a
14
C dated Holocene coastal camp we calculated Holocene summer SSTs of La Paz Bay, Baja California Sur, México. Presently summer δ
18
O of
P. mazatlanica
is −1.8 ± 0.2‰, varying between −1.3‰ and −1.9‰ during the last 8.4 ka. For the years 8413 BP, 7726 BP and 7046 BP, δ
18
O was 0.2–0.1‰ higher than current values, suggesting slightly colder sea surface temperature (SST), while in 7795 BP, values were 0.1‰ lower, suggesting slightly warmer SST. In 6936 BP and 2093 BP, values were 0.4–0.5‰ higher, suggesting significantly colder SSTs. Periods of low (high) SST were characterized by arid (humid) conditions and high (low) marine primary productivity (MPP), favouring human presence (absence) throughout the Holocene. Our results, like those of other paleoceanographic studies, align with orbital forcing and its effects on SST and MPP, which affected human settlement patterns at regional and global scales.
We present new multi-proxy data investigating major environmental transitions over the last 5 kyr BP, based on a sediment core retrieved from the Gulf of Gdańsk (SE Baltic Sea). Between 5 and 1.5 kyr BP, the bay experienced low-energy depositional conditions, which were disrupted around 4 kyr BP, likely due to intens...
Dhanushka Devendra, Prasadi De Silva, Natalia Szymańska et al.· The Holocene· 0 citations
Over recent decades, Iceland has experienced a decline in conventional agriculture, a rapid increase in tourism and significant climatic change, all of which can potentially influence lake ecosystems. To investigate limnological changes over the past 70 years, sediment cores were collected from two lakes: Hafravatn...
Emily Koenders, Peter G. Langdon, Mathis Blache et al.· Hydrobiologia· 0 citations
Understanding past relative sea level (RSL) is important for constraining the timing and magnitude of changes in the cryosphere, providing critical benchmarks for models used to project future sea-level change, and supplying a datum for constraining past vertical motion. Past sea-level records from Antarctica can hel...
Matías Romero, Alexander R. Simms, J. Strelin· Quaternary Research· 0 citations
Greenland Ice Sheet (GrIS) melting occurred during the later part of the Holocene Thermal Maximum (HTM) with a well-documented significant GrIS retreat between 7 and 3 ka. However, less is known about the immediate melt water impact on Greenland fjord hydrography and more distant ocean circulation. A compilation of pub...
A. Kuijpers, M. Seidenkrantz· Géosciences· 0 citations
Late Pleistocene climate in the European Alps was marked by large, orbitally driven fluctuations in temperature, precipitation, and ice extent. Reconstructing mountain glaciation prior to the Last Glacial Maximum remains challenging, however, because glacial deposits are often eroded or reworked. Here we present a...
Jonathan L. Baker, Alexandre Honiat, G. Moseley et al.· Communications Earth & E...· 0 citations
Subfossil cladoceran assemblages from a dated sediment core collected from a small, shallow forest lake in northwestern Poland were used to reconstruct changes in water availability and habitat structure over the past ca. 2000 years. To assess the reliability of cladoceran-based paleohydrological record in a dynamic sh...
Karolina Gorzkiewicz, Dominik Pawłowski, T. Luoto· Journal of Paleolimnology· 0 citations
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