Earlier snowmelt predominates advanced spring vegetation greenup in Alaska
Earlier snowmelt predominates advanced spring vegetation greenup in Alaska
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较早的融雪导致阿拉斯加春季植被提前返绿
DOI：
10.1016/j.agrformet.2022.108828
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发表时间：
2022-03
影响因子：
6.2
通讯作者：
Xiyan Xu
中科院分区：
文献类型：
--
作者：
Jiangshan Zheng;Gensuo Jia;Xiyan Xu
雪被认为是北方气候系统的重要组成部分，然而，对于高纬度生态系统，我们对积雪融化对春季物候变化的影响的了解仍然有限。在这项研究中，我们利用阿拉斯加和加拿大育空地区五个生态区的多个地面观测、卫星数据产品和气候数据集，分析了2000-2019年生长季的开始及其对积雪融化过程的响应。我们发现，春季变暖导致的早期融雪主导了该地区春季植被的高级物候。随着融雪(SOM)的开始，春季植被开始变绿。在2000-2019年期间，各生态区的SOM和SOS以类似的空间格局前进，SOS经历了比SOM更进一步的进步。在SOM推进过程中，SOS平均每天提前0.49天。融雪对植被物候的影响在很大程度上是由融雪引起的土壤温度和土壤水分的协同变化驱动的。随着融雪的开始，融雪水的渗透和剩余积雪的隔热作用刺激了雪下的植被活动。不同生态区对融雪物候的响应不同，与不同的气候背景和植被类型有关。泰加-冻土带交错带的SOS和SOM变化较大，而冻土带变化较小。这一研究表明，为了更好地了解高纬度地区气候变化下的植被季节性，应考虑积雪和融雪物候。上一篇正在发行的文章
Snow is considered a vital component in the northern climate system, however, our understanding of the impacts of snowmelt on spring phenological shifts is still limited for high-latitude ecosystems. In this study, we analyzed the start of growing season (SOS) and its response to the process of snowmelt over 2000–2019 using multiple ground observations, satellite data products, and climate datasets in Alaska and part of Canada Yukon among five ecoregions. We found that the earlier snowmelt resulting from warming spring dominates the advanced spring vegetation phenology in the region. Spring vegetation greenup follows the start of snowmelt (SOM). During 2000–2019, the SOM and SOS advanced in a similar spatial pattern across the ecoregions, and SOS experienced further advancement than SOM. On average, SOS advanced about 0.49 days per day of SOM advancement. The impacts of snowmelt on vegetation phenology are largely driven by the snowmelt-induced synergistic changes in soil temperature and soil water content. As snowmelt starts, the infiltration of snowmelt water and insulation of the remaining snow cover stimulate the vegetation activities below the snow. The responses of SOS to the snowmelt phenology varied among the different ecoregions are associated with the varied climate backgrounds and vegetation types. Greater SOS and SOM advancements were found in the taiga-tundra ecotone, while lower changes were detected over the tundra. This study suggests that the snow cover and snowmelt phenology should be considered to better understand the vegetation seasonality under climate change in the high latitudes... Previous article in issue
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影响因子：
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作者：
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