DOI: 10.1016/j.gloplacha.2016.06.007
论文题名: Lake Vanda: A sentinel for climate change in the McMurdo Sound Region of Antarctica
作者: Castendyk D.N. ; Obryk M.K. ; Leidman S.Z. ; Gooseff M. ; Hawes I.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 144 起始页码: 213
结束页码: 227
语种: 英语
英文关键词: Bathymetry
; Ecology
; Lake level rise
; Limnology
; McMurdo Dry Valleys
; Thermohaline convection
; Wright Valley
Scopus关键词: Bathymetry
; Ecology
; Lakes
; Landforms
; Limnology
; Maps
; Biological structures
; Isothermal conditions
; Lake levels
; Mcmurdo dry valleys
; Surface air temperatures
; Thermohaline
; Water balance models
; Wright Valley
; Climate change
; airflow
; bathymetry
; chlorophyll a
; climate change
; ecology
; glacial lake
; hydrometeorology
; lake level
; limnology
; meltwater
; thermal convection
; thermohaline circulation
; Amundsen Sea
; Antarctic Peninsula
; Antarctica
; East Antarctica
; Lake Vanda
; McMurdo Dry Valleys
; McMurdo Sound
; Onyx River
; Southern Ocean
; West Antarctica
; Wright Valley
; algae
; Onyx
英文摘要: Lake Vanda is a perennially ice-covered, meromictic, endorheic lake located in the McMurdo Dry Valleys of Antarctica, and an exceptional sentinel of climate change within the region. Lake levels rose 15 m over the past 68 years in response to climate-driven variability in ice-cover sublimation, meltwater production, and annual discharge of the Onyx River, the main source of water to the lake. Evidence from a new bathymetric map and water balance model combined with annual growth laminations in benthic mats suggest that the most recent filling trend began abruptly 80 years ago, in the early 1930s. This change increased lake volume by > 50%, triggered the formation of a new, upper, thermohaline convection cell, and cooled the lower convection cell by at least 2 °C and the bottom-most waters by at > 4 °C. Additionally, the depth of the deep chlorophyll a maximum rose by > 2 m, and deep-growing benthic algal mats declined while shallow benthic mats colonized freshly inundated areas. We attribute changes in hydrology to regional variations in air flow related to the strength and position of the Amundsen Sea Low (ASL) pressure system which have increased the frequency of down-valley, föhn winds associated with surface air temperature warming in the McMurdo Dry Valleys. The ASL has also been implicated in the recent warming of the Antarctic Peninsula, and provides a common link for climate-related change on opposite sides of the continent. If this trend persists, Lake Vanda should continue to rise and cool over the next 200 years until a new equilibrium lake level is achieved. Most likely, future lake rise will lead to isothermal conditions not conducive to thermohaline convection, resulting in a drastically different physical, biogeochemical, and biological structure than observed today. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981306061&doi=10.1016%2fj.gloplacha.2016.06.007&partnerID=40&md5=333a110281c1c7fa7805fb0be195c21d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11646
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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Recommended Citation:
Castendyk D.N.,Obryk M.K.,Leidman S.Z.,et al. Lake Vanda: A sentinel for climate change in the McMurdo Sound Region of Antarctica[J]. Global and Planetary Change,2016-01-01,144.