Solar radiation as a global driver of hillslope asymmetry: Insights from an ecogeomorphic landscape evolution model
Solar radiation as a global driver of hillslope asymmetry: Insights from an ecogeomorphic landscape evolution model
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太阳辐射作为山坡不对称的全球驱动因素：来自生态地貌景观演化模型的见解
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Duvall
中科院分区：
文献类型：
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作者：
O. Yetemen;E. Istanbulluoglu;A. Duvall
对一系列干旱和半干旱气候和纬度的实地、流域和大陆尺度的观测揭示了土壤性质、植被类型、生态水文通量和山坡形态的方面控制模式。尽管太阳辐射在地球表面的全球分布及其对植被动态的影响已有详细记录，但我们对跨纬度太阳辐射的变化如何影响景观演化和由此产生的地貌差异知之甚少。在这里，我们使用景观演化模型，将每个模型元素的水、沉积物和地上植被生物量的连续性方程耦合起来，以探索纬度和年平均降水量（MAP）对山坡不对称（HA）发展的控制。在我们的模型中，不对称的山坡是由太阳辐射的空间分布驱动的土壤蠕变和植被调节的河流输送之间的竞争而出现的。纬度是 HA 的主要驱动因素，因为它对太阳辐射的全球分布有影响。在北半球，朝北的斜坡（NFS）支持更多的植被覆盖，但运输效率较低，朝北极方向变得更陡，而朝南的斜坡（SFS）变得更平缓。在南半球，模式相反，SFS 向南极变得更加陡峭。对于任何给定的纬度，MAP 对 HA 的控制较小。我们的结果强调了太阳辐射作为对河流景观中不对称山坡发展的全球控制的潜在影响。
Observations at the field, catchment, and continental scales across a range of arid and semiarid climates and latitudes reveal aspect‐controlled patterns in soil properties, vegetation types, ecohydrologic fluxes, and hillslope morphology. Although the global distribution of solar radiation on earth's surface and its implications on vegetation dynamics are well documented, we know little about how variation of solar radiation across latitudes influence landscape evolution and resulting geomorphic difference. Here, we used a landscape evolution model that couples the continuity equations for water, sediment, and aboveground vegetation biomass at each model element in order to explore the controls of latitude and mean annual precipitation (MAP) on the development of hillslope asymmetry (HA). In our model, asymmetric hillslopes emerged from the competition between soil creep and vegetation‐modulated fluvial transport, driven by spatial distribution of solar radiation. Latitude was a primary driver of HA because of its effects on the global distribution of solar radiation. In the Northern Hemisphere, north‐facing slopes (NFS), which support more vegetation cover and have lower transport efficiency, get steeper toward the North Pole while south‐facing slopes (SFS) get gentler. In the Southern Hemisphere, the patterns are reversed and SFS get steeper toward the South Pole. For any given latitude, MAP is found to have minor control on HA. Our results underscore the potential influence of solar radiation as a global control on the development of asymmetric hillslopes in fluvial landscapes.
通过电阻率断层扫描观察博尔德溪关键区天文台的地下结构
影响因子：
3.3
作者：
Leopold;Völkel;D. Dethier
通讯作者：
D. Dethier