年间温度变化与北方北极植被活动之间的关系减弱的季节性分歧
Haijiang Zhao1,2,3, Ning Jin4, Xiurong Wang5
1China Meteorological Administration Xiong'an Atmospheric Boundary Layer Key Laboratory, Xiong'an New Area 071800, China.
Plants (Basel, Switzerland)
|July 14, 2023
概括
全球变暖全球变暖.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 遥感 遥感 遥感 遥感
背景情况:
- 北极植被对全球变暖的反应显示,近几十年来北极植被的趋势正在减弱.
- 以前的模型往往忽略了白天温度范围 (DTR),只关注每日平均温度 (Tmean).
- 了解这些关系对于预测气候变化下的植被动态至关重要.
研究的目的:
- 分析北极地区Tmean,DTR和植被活动 (NDVI) 之间的关系的时间趋势.
- 在年度和季节性时间尺度上研究这些关系.
- 评估北极景观中这些趋势的空间范围.
主要方法:
- 利用卫星衍生植被指数 (NDVI) 和气候数据集.
- 采用了部分相关性分析来检查NDVI-温度关系.
- 应用了17年的移动窗口来评估34年的时间趋势.
主要成果:
- 在34年中,在生长季节的NDVI-T平均关系 (R_NDVI-T平均) 中观察到显著的下降趋势.
- 季节性分析显示,R_NDVI-T平均在春季呈上升趋势,但夏季和秋季呈下降趋势.
- NDVI-DTR关系的趋势 (R_NDVI-DTR) 反映了R_NDVI-T平均值的趋势,北极大面积显著下降.
结论:
- 温度对北极植被活动的影响正在减弱.
- 每日平均温度和昼间温度范围都起作用,观察到的一致的减弱趋势.
- 这些发现增强了对北极生态系统对持续的全球变暖的反应的理解.
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