Satellite monitoring of boreal forest phenology and its climatic responses in Eurasia

Liu, Hai-Bo; Wang, Cuizhen; Zhang, Lijuan; Li, Xiaxiang; Zang, Shuying

doi:10.1080/01431161.2017.1339925

Cited by 24 publications

(19 citation statements)

References 32 publications

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“…Our study estimated that the EOS over the middle and eastern Eurasia region was delayed on average by a rate of 0.07 days/year from 1982 to 2015. Previous studies also documented that the EOS experienced a delayed trend in regions of the Northern Hemisphere, such as North America (Zhu et al, ), Eurasia (Li et al, ), Europe (Garonna et al, ; Stöckli & Vidale, ), temperate China (Liu, Fu, Zeng, et al, ; Yang et al, ), and the Tibetan Plateau (Cong, Shen, & Piao ; Jin, Zhuang, He, Luo, & Shi ). Compared with other regions around the Northern Hemisphere at the same period, the delayed trend in EOS (0.07 days/year) is smaller than that in North America (0.36 days/year from 1982 to 2006; Zhu et al, ) and is also smaller than that in Europe (0.14 days/year compared to 0.47 days/year from 1982 to 2000; Stöckli & Vidale, ).…”

Section: Discussionmentioning

confidence: 90%

“…Eurasia region was delayed on average by a rate of 0.07 days/year from 1982 to 2015. Previous studies also documented that the EOS experienced a delayed trend in regions of the Northern Hemisphere, such as North America (Zhu et al, 2012), Eurasia (Li et al, 2017),…”

Section: Changes In Eos Trendsmentioning

confidence: 87%

“…Previous studies showed that global warming trends have decelerated over the past decade (Cane, ; Chen & Tung, ; Solomon et al, ). In contrast, warming in the spring at higher latitudes of the Northern Hemisphere has lasted over the recent decades (Kaufman, Schneider, McKay, Ammann, & Bradley, ; Li, Wang, Zhang, Li, & Zang, ; Serreze & Barry, ). Therefore, the SOS in Cold zone and Cold‐Temperate zone still significantly advanced after the mid‐1990s.…”

Section: Discussionmentioning

confidence: 99%

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Discrepancies in vegetation phenology trends and shift patterns in different climatic zones in middle and eastern Eurasia between 1982 and 2015

Zhang

et al. 2019

Ecology and Evolution

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Changes in vegetation phenology directly reflect the response of vegetation growth to climate change. In this study, using the Normalized Difference Vegetation Index dataset from 1982 to 2015, we extracted start date of vegetation growing season (SOS), end date of vegetation growing season (EOS), and length of vegetation growing season (LOS) in the middle and eastern Eurasia region and evaluated linear trends in SOS, EOS, and LOS for the entire study area, as well as for four climatic zones. The results show that the LOS has significantly increased by 0.27 days/year, mostly due to a significantly advanced SOS (−0.20 days/year) and a slightly delayed EOS (0.07 days/year) over the entire study area from 1982 to 2015. The vegetation phenology trends in the four climatic zones are not continuous throughout the 34‐year period. Furthermore, discrepancies in the shifting patterns of vegetation phenology trend existed among different climatic zones. Turning points (TP) of SOS trends in the Cold zone, Temperate zone, and Tibetan Plateau zone occurred in the mid‐ or late 1990s. The advanced trends of SOS in the Cold zone, Temperate zone, and Tibetan Plateau zone exhibited accelerated, stalled, and reversed patterns after the corresponding TP, respectively. The TP did not occurred in Cold‐Temperate zone, where the SOS showed a consistent and continuous advance. TPs of EOS trends in the Cold zone, Cold‐Temperate zone, Temperate zone, and Tibetan Plateau zone occurred in the late 1980s or mid‐1990s. The EOS in the Cold zone, Cold‐Temperate zone, Temperate zone, and Tibetan Plateau zone showed weak advanced or delayed trends after the corresponding TP, which were comparable with the delayed trends before the corresponding TP. The shift patterns of LOS trends were primarily influenced by the shift patterns of SOS trends and were also heterogeneous within climatic zones.

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Section: Discussionmentioning

confidence: 90%

Section: Changes In Eos Trendsmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

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Discrepancies in vegetation phenology trends and shift patterns in different climatic zones in middle and eastern Eurasia between 1982 and 2015

Zhang

et al. 2019

Ecology and Evolution

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“…Declining snow cover may be responsible for the change of EVI associated with the greening trend. To avoid the effects of snow melt, we assigned the negative EVI value to 0 [43,44]. Then, we employed TIMESAT software, which includes a double logistic algorithm and has been widely used to investigate vegetation dynamics [17,44,45].…”

Section: Vegetation Dynamics Metricsmentioning

confidence: 99%

“…To avoid the effects of snow melt, we assigned the negative EVI value to 0 [43,44]. Then, we employed TIMESAT software, which includes a double logistic algorithm and has been widely used to investigate vegetation dynamics [17,44,45]. It allows various vegetation parameters to be derived, including the SOS and EVI max (the maximum value of the annual EVI time series fitted by the double logistic curve).…”

Section: Vegetation Dynamics Metricsmentioning

confidence: 99%

Diverse Responses of Vegetation Dynamics to Snow Cover Phenology over the Boreal Region

Xiong

Zhang

Zhao

et al. 2019

Forests

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Snow cover phenology plays an important role in vegetation dynamics over the boreal region, but the observed evidence of this interaction is limited. A comprehensive understanding of the changes in vegetation dynamics and snow cover phenology as well as the interactions between them is urgently needed. To investigate this, we calculated two indicators, the start of the growing season (SOS) and the annual maximum enhanced vegetation index (EVImax), as proxies of vegetation dynamics using the Moderate Resolution Imaging Spectroradiometer (MODIS) enhanced vegetation index (EVI). Snow cover duration (SCD) and snow cover end date (SCE) were also extracted from MODIS snow cover datasets. Then, we quantified the spatial-temporal changes in vegetation dynamics and snow cover phenology as well as the relationship between them over the boreal region. Our results showed that the EVImax generally demonstrated an increasing trend, but SOS varied in different regions and vegetation types from 2001 to 2014. The earlier onset of SOS was mainly concentrated in the Siberian boreal region. In the Eurasian boreal region, we observed an advance in the SCE and decrease in the SCD, while in the North American boreal region, the spatial distribution of the trends exhibited substantial heterogeneity. Our results also indicated that the snow cover phenology had significant impacts on the SOS and the EVImax, but the effects varied in different regions, vegetation types, and climate gradients. Our findings provide strong evidence of the interaction between vegetation dynamics and snow cover phenology, and snow cover should be considered when analyzing future vegetation dynamics in the boreal region.

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Detecting Change-Points in the Time Series of Surfaces Occupied by Pre-defined NDVI Categories in Continental Spain from 1981 to 2015

Militino

Ugarte

Pérez-Goya

2018

Studies in Systems, Decision and Control

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Satellite monitoring of boreal forest phenology and its climatic responses in Eurasia

Cited by 24 publications

References 32 publications

Discrepancies in vegetation phenology trends and shift patterns in different climatic zones in middle and eastern Eurasia between 1982 and 2015

Discrepancies in vegetation phenology trends and shift patterns in different climatic zones in middle and eastern Eurasia between 1982 and 2015

Diverse Responses of Vegetation Dynamics to Snow Cover Phenology over the Boreal Region

Detecting Change-Points in the Time Series of Surfaces Occupied by Pre-defined NDVI Categories in Continental Spain from 1981 to 2015

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