The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka
Here, we present a grain size end-member analysis for Tengchongbeihai wetland sediments from southwestern China to investigate the paleo-hydroclimate changes since the late MIS3. The overall low fine silt (EM2) content before ~16.5 cal ka BP resulted from weak catchment erosion indicating weak ISM d...
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ftzenodo:oai:zenodo.org:10252213 2024-09-15T18:20:24+00:00 The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka Ning, Dongliang 2023-12-03 https://doi.org/10.5281/zenodo.10252213 eng eng Zenodo https://doi.org/10.5281/zenodo.10252212 https://doi.org/10.5281/zenodo.10252213 oai:zenodo.org:10252213 info:eu-repo/semantics/restrictedAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/other 2023 ftzenodo https://doi.org/10.5281/zenodo.1025221310.5281/zenodo.10252212 2024-07-25T17:58:26Z Here, we present a grain size end-member analysis for Tengchongbeihai wetland sediments from southwestern China to investigate the paleo-hydroclimate changes since the late MIS3. The overall low fine silt (EM2) content before ~16.5 cal ka BP resulted from weak catchment erosion indicating weak ISM during cold glacial while the increasing trend thereafter indicates the ISM strengthened during the last deglaciation and Holocene. Such an orbital ISM evolution resembles to the insolation gradient between 25°N and 25°S during the boreal summer periods, which implies the transequatorial insolation difference could be an alternative explanation for the orbital scale low latitude hydroclimate changes. The striking peaks of coarse component (EM3) around ~12,16, 24, 29, 32 and 39 cal ka BP were related to significant water level descending indicating the millennial ISM collapse corresponding to the YD and Heinrich events. However, the absence of sawtooth feature as the NGRIP δ18O and the well correspondence to the Indian Ocean sea surface temperatures (SSTs) of the ISM collapses evidence the complementary role of low latitude climate for the North Atlantic climate on the millennial scale hydroclimate variabilities. Other/Unknown Material NGRIP North Atlantic Zenodo |
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English |
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Here, we present a grain size end-member analysis for Tengchongbeihai wetland sediments from southwestern China to investigate the paleo-hydroclimate changes since the late MIS3. The overall low fine silt (EM2) content before ~16.5 cal ka BP resulted from weak catchment erosion indicating weak ISM during cold glacial while the increasing trend thereafter indicates the ISM strengthened during the last deglaciation and Holocene. Such an orbital ISM evolution resembles to the insolation gradient between 25°N and 25°S during the boreal summer periods, which implies the transequatorial insolation difference could be an alternative explanation for the orbital scale low latitude hydroclimate changes. The striking peaks of coarse component (EM3) around ~12,16, 24, 29, 32 and 39 cal ka BP were related to significant water level descending indicating the millennial ISM collapse corresponding to the YD and Heinrich events. However, the absence of sawtooth feature as the NGRIP δ18O and the well correspondence to the Indian Ocean sea surface temperatures (SSTs) of the ISM collapses evidence the complementary role of low latitude climate for the North Atlantic climate on the millennial scale hydroclimate variabilities. |
format |
Other/Unknown Material |
author |
Ning, Dongliang |
spellingShingle |
Ning, Dongliang The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka |
author_facet |
Ning, Dongliang |
author_sort |
Ning, Dongliang |
title |
The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka |
title_short |
The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka |
title_full |
The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka |
title_fullStr |
The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka |
title_full_unstemmed |
The grain size endmembers of Tengchongbeihai wetland sediments over the past 46 ka |
title_sort |
grain size endmembers of tengchongbeihai wetland sediments over the past 46 ka |
publisher |
Zenodo |
publishDate |
2023 |
url |
https://doi.org/10.5281/zenodo.10252213 |
genre |
NGRIP North Atlantic |
genre_facet |
NGRIP North Atlantic |
op_relation |
https://doi.org/10.5281/zenodo.10252212 https://doi.org/10.5281/zenodo.10252213 oai:zenodo.org:10252213 |
op_rights |
info:eu-repo/semantics/restrictedAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.1025221310.5281/zenodo.10252212 |
_version_ |
1810458784012697600 |