文章基本信息

标题：The influence of carbon exchange of a large lake on regional tracer-transport inversions: results from Lake Superior
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作者：Victoria N Vasys ; Ankur R Desai ; Galen A McKinley 等
期刊名称：Environmental Research Letters
印刷版ISSN：1748-9326
电子版ISSN：1748-9326
出版年度：2011
卷号：6
期号：3
页码：034016-034016
DOI：10.1088/1748-9326/6/3/034016
语种：English
出版社：IOP Publishing Ltd
摘要：Large lakes may constitute a significant component of regional surface–atmosphere fluxes, but few efforts have been made to quantify these fluxes. Tracer-transport inverse models that infer the CO₂ flux from the atmospheric concentration typically assume that the influence from large lakes is negligible. CO₂ observations from a tall tower in Wisconsin segregated by wind direction suggested a CO₂ signature from Lake Superior. To further investigate this difference, source–receptor influence functions derived using a mesoscale transport model were applied and results revealed that air masses sampled by the tower have a transit time over the lake, primarily in winter when the total lake influence on the tower can exceed 20% of the total influence of the regional domain. When the influence functions were convolved with air–lake fluxes estimated from a physical–biogeochemical lake model, the overall total contribution of lake fluxes to the tall tower CO₂ were mostly negligible, but potentially detectable in certain periods of fall and winter when lake carbon exchange can be strong and land carbon efflux weak. These findings suggest that large oligotrophic lakes would not significantly influence inverse models that incorporate tall tower CO₂.