Spatial Correlation Increase in Single-Sensor Satellite Data Reveals Loss of Amazon Rainforest Resilience

IF 7.3 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Earths Future Pub Date : 2024-07-26 DOI:10.1029/2023EF004040
Lana L. Blaschke, Da Nian, Sebastian Bathiany, Maya Ben-Yami, Taylor Smith, Chris A. Boulton, Niklas Boers
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Abstract

The Amazon rainforest (ARF) is threatened by deforestation and climate change, which could trigger a regime shift to a savanna-like state. Whilst previous work has suggested that forest resilience has declined in recent decades, that work was based only on local resilience indicators, and moreover was potentially biased by the employed multi-sensor and optical satellite data and undetected anthropogenic land-use change. Here, we show that the average correlation between neighboring grid cells' vegetation time series, which is referred to as spatial correlation, provides a more robust resilience indicator than local estimations. We employ it to measure resilience changes in the ARF, based on single-sensor Vegetation Optical Depth data under conservative exclusion of human activity. Our results show an overall loss of resilience until around 2019, which is especially pronounced in the southwestern and northern Amazon for the time period from 2002 to 2011. The results from the reliable spatial correlation indicator suggest that in particular the southwest of the ARF has experienced pronounced resilience loss over the last two decades.

Abstract Image

单传感器卫星数据的空间相关性增加揭示了亚马逊雨林复原力的丧失
亚马逊雨林(ARF)正受到森林砍伐和气候变化的威胁,这可能会引发向热带稀树草原状态的转变。虽然之前的研究表明森林的恢复力在最近几十年有所下降,但该研究仅基于当地的恢复力指标,而且所采用的多传感器和光学卫星数据以及未发现的人为土地利用变化可能会造成偏差。在这里,我们表明,相邻网格单元植被时间序列之间的平均相关性(即空间相关性)提供了比局部估算更可靠的恢复力指标。在保守排除人类活动的情况下,我们根据单传感器植被光学深度数据,利用空间相关性来衡量 ARF 的恢复力变化。我们的结果表明,直到 2019 年左右,恢复力总体上有所下降,尤其是在亚马逊西南部和北部,从 2002 年到 2011 年这段时间,这种下降尤为明显。可靠的空间相关性指标的结果表明,在过去二十年里,亚马逊区域森林西南部的恢复力损失尤为明显。
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来源期刊
Earths Future
Earths Future ENVIRONMENTAL SCIENCESGEOSCIENCES, MULTIDI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
11.00
自引率
7.30%
发文量
260
审稿时长
16 weeks
期刊介绍: Earth’s Future: A transdisciplinary open access journal, Earth’s Future focuses on the state of the Earth and the prediction of the planet’s future. By publishing peer-reviewed articles as well as editorials, essays, reviews, and commentaries, this journal will be the preeminent scholarly resource on the Anthropocene. It will also help assess the risks and opportunities associated with environmental changes and challenges.
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