The Influence of Climate Change on Forest Fires in Yunnan Province, Southwest China Detected by GRACE Satellites
The Influence of Climate Change on Forest Fires in Yunnan Province, Southwest China Detected by GRACE Satellites
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DOI：
10.3390/rs14030712
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发表时间：
2022-02-01
期刊：
影响因子：
5
通讯作者：
Wang, Xiaolong
中科院分区：
文献类型：
--
作者：
Cui, Lilu;Luo, Chuanjiang;Wang, Xiaolong
云南省中国森林资源丰富，但森林火灾发生频率较高。因此，更好地了解气候变化与该地区森林火灾的关系，对于森林防火具有重要意义。本研究利用重力恢复与气候实验(GRACE)陆地水储存变化(TWSC)数据，分析了2003-2016年间气候变化对该地区森林火灾的影响。为了提高GRACE TWSC数据的准确性和可靠性，我们使用了广义三角帽(GTCH)和最小二乘法对来自6个GRACE解的TWSC数据进行融合。利用火场面积数据研究了2003-2016年间森林火灾的时空变化。然后分析了火场面积与水文、气候因子的关系。结果表明，云南省90%以上的火烧区位于滇西北和滇南(西北部和S)。在季节尺度上，森林火灾主要集中在1~4月(旱季)，火烧面积与降水量(相关系数r=-0.83(NW)和-0.51(S))、相对湿度(r=-0.79(NW)和-0.92(S))、Grace twsc(r=-0.57(NW)和-0.73(S))和蒸散量(r=-0.90(NW)和-0.35(S))负相关。而在年际尺度上，火烧面积与上述四个因子的相关性不显著。综合分析表明，极端气候影响了该地区的降水、蒸散和TWSC，从而改变了该地区空气的储水量，导致了易发生森林火灾的环境的形成。这种情况导致上述地区的烧伤面积增加。我们还发现，多火年和少火年的TWSC的差异远远大于同期降水量。上述结果表明，GRACE卫星可以探测到气候变化对云南省森林火灾的影响。
Yunnan province in China has rich forest resources but high forest fire frequency. Therefore, a better understanding of the relationship between climate change and forest fires in this region is important for forest fire prevention. This study used the Gravity Recovery and Climate Experiment (GRACE) terrestrial water storage change (TWSC) data to analyze the influence of climate change on forest fires in the region during 2003-2016. To improve the accuracy and reliability of GRACE TWSC data, we used the generalized three-cornered hat (GTCH) and the least square method to fuse TWSC data from six GRACE solutions. The spatiotemporal variation of forest fires during 2003-2016 was investigated using burned area data. Then, the relationship between burned area and hydrological and climatic factors was analyzed. The results indicate that more than 90% of burned areas are located in northwestern and southern Yunnan (NW and S). On the seasonal scale, forest fires are mainly concentrated in January-April (dry season) and the burned area is negatively correlated with precipitation (correlation coefficient r = -0.83 (NW) and -0.51 (S)), relative humidity (r = -0.79 (NW) and -0.92 (S)), GRACE TWSC (r = -0.57 (NW) and -0.73 (S)) and evapotranspiration (r = -0.90 (NW) and -0.35 (S)). However, the burned area has no significant correlations with the above four factors on the interannual scale. The composite analysis suggests that the extreme climate affects precipitation, evapotranspiration and TWSC in this region, thereby changing water storage of the air in this region, leading to the formation of an environment prone to forest fires. Such conditions have led to an increase in the burned area in the above region. We also found that the difference between TWSC in high- and low-fire years is much greater than the precipitation in the same period. The above results show that GRACE satellites can detect the influence of climate change on forest fires in Yunnan province.