Interrelationship between paleovegetation in southern and central California and northeast Pacific atmospheric and oceanographic processes over the last ~30 kyr SCOPUS KCI

Title
Interrelationship between paleovegetation in southern and central California and northeast Pacific atmospheric and oceanographic processes over the last ~30 kyr
Author(s)
Suh, Y.J.
KIOST Author(s)
Suh, Yeon Jee(서연지)
Publication Year
2019
Abstract
Understanding the interaction between climate and the water cycle is critical especially in a drought sensitive region such as California. This study explored hydrologic changes in central and southern California in relation to the glacial-interglacial climate cycles over the last 30 thousand years. To do this, we reconstructed paleovegetation using plant wax carbon isotopic compositions (δ13C) preserved in marine sediment cores retrieved from the central California continental shelf (ODP Site 1018) and Santa Barbara Basin (ODP Site 893A). The results were then compared to the existing sea surface temperature (SST) and pollen records from the same cores to understand terrestrial hydrology in relation to oceanographic processes. The Last Glacial was generally dry both in central and southern California, indicated by grassland expansion, confirming the previously suggested notion that the westerly storm track that supplies the majority of the precipitation in California may not have moved southward during the glacial period. Southern California was drier than central California during the Last Glacial Maximum (LGM). This drying trend may have been associated with the weakening of the California Current and northerly winds leading to the early increase in SST in southern California and decline in both offshore and coastal upwelling. The climate was wetter during the Holocene in both regions compared to the glacial period and forest coverage increased accordingly. We attribute this wetter condition to the precipitation contribution increase from the tropics. Overall, we found a clear synchronicity between the terrestrial and marine environment which showed that the terrestrial vegetation composition in California is greatly affected by not only the global climate states but also regional oceanographic and atmospheric conditions that regulate the timing and amount of precipitation over California. © 2019, Korea Ocean Research and Development Institute. All rights reserved.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/740
DOI
10.4217/OPR.2019.41.3.159
Bibliographic Citation
Ocean and Polar Research, v.41, no.3, pp.159 - 168, 2019
Publisher
Korea Ocean Research and Development Institute
Subject
C3 plant; C4 plant; glacial-interglacial cycle; paleoatmosphere; paleobiogeography; paleoceanography; paleoclimate; stable isotope; vegetation cover; California; Pacific Coast [North America]; Pacific Coast [United States]; Pacific Ocean; Pacific Ocean (Northeast); United States
Keywords
C3 plant; C4 plant; Compound-specific stable isotope; Paleoclimate; Plant wax; United States West Coast
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

유기 생지화학,바이오마커

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