Continental‐scale variation in controls of summer CO2 in United States lakes
Continental‐scale variation in controls of summer CO2 in United States lakes
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DOI：
10.1002/2016jg003525
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发表时间：
2017-04
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影响因子：
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通讯作者：
Jean‐François Lapierre;D. Seekell;Chris T. Filstrup;S. Collins;C. Emi Fergus;P. Soranno;K. Cheruvelil
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文献类型：
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作者：
Jean‐François Lapierre;D. Seekell;Chris T. Filstrup;S. Collins;C. Emi Fergus;P. Soranno;K. Cheruvelil
了解湖泊CO2动态对全球变化的大尺度响应具有挑战性，因为在广泛的地理范围内，地表水CO2的不同控制的相对重要性尚不清楚。使用地质统计学分析1080个湖泊在接壤的美国，我们发现，湖泊二氧化碳分压（pCO 2）控制不同的化学和生物因素有关的输入和损失的CO2沿着气候，地形，地貌和土地利用梯度。尽管在整个研究范围内pCO 2的空间模式较弱，但pCO 2驱动-响应关系中存在较强的区域模式，即，在pCO 2“调节”中。由于湖泊CO2及其预测因子之间的关系在空间上存在差异，因此全球模型在解释美国湖泊CO2的变化方面表现不佳。湖泊pCO 2的地理变化驱动-响应关系反映了整个研究范围内的主要景观梯度，并指出了pCO 2调节中区域尺度变化的重要性。这些结果表明，这些物理上不连通的系统比以前认为的更高层次的组织，并表明气候和土地利用的变化可能会导致主要途径的变化，这些途径决定了湖泊作为大气CO2源和汇的作用。
Understanding the broad‐scale response of lake CO2 dynamics to global change is challenging because the relative importance of different controls of surface water CO2 is not known across broad geographic extents. Using geostatistical analyses of 1080 lakes in the conterminous United States, we found that lake partial pressure of CO2 (pCO2) was controlled by different chemical and biological factors related to inputs and losses of CO2 along climate, topography, geomorphology, and land use gradients. Despite weak spatial patterns in pCO2 across the study extent, there were strong regional patterns in the pCO2 driver‐response relationships, i.e., in pCO2 “regulation.” Because relationships between lake CO2 and its predictors varied spatially, global models performed poorly in explaining the variability in CO2 for U.S. lakes. The geographically varying driver‐response relationships of lake pCO2 reflected major landscape gradients across the study extent and pointed to the importance of regional‐scale variation in pCO2 regulation. These results indicate a higher level of organization for these physically disconnected systems than previously thought and suggest that changes in climate and land use could induce shifts in the main pathways that determine the role of lakes as sources and sinks of atmospheric CO2.