DOI: 10.1029/2019PA003628
论文题名: Southern California Vegetation, Wildfire, and Erosion Had Nonlinear Responses to Climatic Forcing During Marine Isotope Stages 5–2 (120–15 ka)
作者: Glover K.C. ; Chaney A. ; Kirby M.E. ; Patterson W.P. ; MacDonald G.M.
刊名: Paleoceanography and Paleoclimatology
ISSN: 25724517
出版年: 2020
卷: 35, 期: 2 语种: 英语
英文关键词: charcoal
; insolation
; Mediterranean biome
; pollen
; Southern California
; wildfire
Scopus关键词: biome
; charcoal
; climate change
; climate forcing
; coniferous forest
; erosion rate
; glacial-interglacial cycle
; historical record
; hydrometeorology
; insolation
; marine isotope stage
; Mediterranean environment
; nonlinearity
; pollen
; proxy climate record
; sea surface temperature
; vegetation dynamics
; wildfire
; Baldwin Lake
; California
; Coast Ranges
; Eurasia
; San Bernardino Mountains
; United States
; Artemisia tridentata
英文摘要: A multiproxy record from Baldwin Lake, San Bernardino Mountains, allowed us to examine variation and relationships between erosion, wildfire, vegetation, and climate in subalpine Southern California from 120 to 15 ka. Bulk organics, biogenic silica, and molar C:N data were generally antiphased with magnetic and trace element data and displayed long-term (105 year) shifts between autochthonous and allocthonous deposition. This was most pronounced during Marine Isotope Stage (MIS) 5, and we hypothesize that local summer insolation was the primary driver for Baldwin Lake's productive and unproductive lake state alternations. Wildfire history was inferred from charcoal concentrations and vegetation change from pollen. Relationships between these ecological processes, basin deposition, and summer insolation were often nonlinear. Sagebrush expansion, wildfire, and weak basin weathering characterized MIS 4, while during MIS 2, the basin was highly erosive, rarely burned, and the forest was impacted by shifts in Southern Californian hydroclimate. Despite coniferous forest cover throughout MIS 3, submillennial oscillations in charcoal, pollen, and bulk organic content occurred, consistent with pollen records from Eurasia's Mediterranean biome that span multiple glacial-interglacial cycles. Highly resolved global CO2 records and sea surface temperatures in key regions of the Pacific show no apparent relationship to these landscape conditions, and we suggest submillennial hydroclimatic variability as a potential driver. Highly resolved long pollen records from Southern California are an urgent research need to better understand the finer-scale (≤103 year) interactions between past vegetation, wildfire, and erosion, given the current natural disaster risks that 21st century climate change poses to both human and ecological communities. ©2020. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159763
Appears in Collections: 气候变化与战略
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作者单位: Department of Geography, University of California, Los Angeles, CA, United States; Climate Change Institute, University of Maine, Orono, ME, United States; Department of Geological Sciences, California State University, Fullerton, Fullerton, CA, United States; Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada; Institute of the Environment and Sustainability, University of California, Los Angeles, CA, United States
Recommended Citation:
Glover K.C.,Chaney A.,Kirby M.E.,et al. Southern California Vegetation, Wildfire, and Erosion Had Nonlinear Responses to Climatic Forcing During Marine Isotope Stages 5–2 (120–15 ka)[J]. Paleoceanography and Paleoclimatology,2020-01-01,35(2)