Albedo change from snow algae blooms can contribute substantially to snow melt in the North Cascades, USA
Albedo change from snow algae blooms can contribute substantially to snow melt in the North Cascades, USA
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DOI：
10.1038/s43247-023-00768-8
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发表时间：
2023-05-08
影响因子：
7.9
通讯作者：
Khan, Alia L. L.
中科院分区：
文献类型：
--
作者：
Healy, Shannon M. M.;Khan, Alia L. L.
夏季减少，由于藻类水华在中纬度积雪表面可能会大大提高积雪融化，建议与自动驾驶飞行器和数值光谱建模的观测结果，在北喀斯喀特山脉，美国。雪藻是无处不在的太平洋西北冰冻圈在夏季融雪是一个重要的贡献区域流域。然而，与无机光吸收颗粒相比，生物杂质作为融雪剂的驱动因素受到的关注较少。在这里，我们绘制了山附近的雪藻。贝克与无人驾驶飞行器上的多光谱相机使用（1）主成分和（2）光谱索引。这两种方法在不同的水华状态下进行了测试，并与一致的藻类色素和细胞计数数据进行了验证。在高水华强度期间，我们发现平均瞬时辐射强迫为237 W m（-2），最大值为360 W m（-2）。这意味着在0.1 km（2）盆地中有1，508 +/- 536 m（3）的融化雪水。这些结果表明，雪藻有助于中纬度地区的融雪，以及无人驾驶汽车在冰冻圈广阔区域绘制雪藻地图的潜力。
Summertime decreases in albedo due to algal blooms on mid-latitude snowpack surfaces may strongly enhance snow melt, suggest observations with autonomous aerial vehicles and numerical spectral modelling of resultant albedo changes in the North Cascades, USA.Snow algae are ubiquitous in the Pacific Northwest cryosphere in the summer where snowmelt is an important contribution to regional watersheds. However, less attention has been given to biological impurities as drivers of snowmelt compared to inorganic light-absorbing particles. Here we map snow algae near Mt. Baker with a multispectral camera on an uncrewed aerial vehicle using (1) principal components and (2) spectral indexing. The two approaches are tested under differing bloom states and verified with coincident algal pigment and cell count data. During high bloom intensity we found an average instantaneous radiative forcing of 237 W m(-2) with a maximum of 360 W m(-2). This translated to 1,508 +/- 536 m(3) of melted snow water equivalent in the 0.1 km(2) basin. These results demonstrate snow algae contribute to snowmelt at mid-latitudes and the potential for uncrewed autonomous vehicles to map snow algae over expansive areas of the cryosphere.