Nonlinear response of vegetation green-up to local temperature variations in temperate and boreal forests in the Northern Hemisphere

Park, Hoonyoung; Jeong, Su‐Jong; Ho, Chang-Hoi; Kim, Jinwon; Brown, M. E.; Schaepman, Michael E.

doi:10.1016/j.rse.2015.04.030

Cited by 64 publications

(52 citation statements)

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“…It is unclear whether the (weak but significant) shortening of the GS we identified for the 'Extremely Cold and Mesic' is linked to a shift to a negative response of vegetation growth to increasing temperatures from the mid-1990s onward, as suggested by Buermann et al (2014); or to a cooling trend as identified over the last decade in western North America and Eurasia by both in situ and remotely sensed temperature and sea ice extent data (Bhatt et al, 2013); or to large-scale transformation of the landscape because of increasing deciduous shrubs. Overall, a number of co-occurring climatic and vegetation changes appear to be at play over this area and need to be further explored (Urban et al, 2014;Park et al, 2015). Overall, our results highlight LSP change in an area that is already an important research focus for climate change science.…”

Section: Shifting Global Lsp Dynamicsmentioning

confidence: 73%

“…(); or to a cooling trend as identified over the last decade in western North America and Eurasia by both in situ and remotely sensed temperature and sea ice extent data (Bhatt et al ., ); or to large‐scale transformation of the landscape because of increasing deciduous shrubs. Overall, a number of co‐occurring climatic and vegetation changes appear to be at play over this area and need to be further explored (Urban et al ., ; Park et al ., ). Overall, our results highlight LSP change in an area that is already an important research focus for climate change science.…”

Section: Discussionmentioning

confidence: 97%

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Variability and evolution of global land surface phenology over the past three decades (1982–2012)

Garonna

Jong

Schaepman

2016

Global Change Biology

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142

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Monitoring Land Surface Phenology (LSP) is important for understanding both the responses and feedbacks of ecosystems to the climate system, and for representing these accurately in terrestrial biosphere models. Moreover, by shedding light on phenological trends at a variety of scales, LSP has the potential to fill the gap between traditional phenological (field) observations and the large-scale view of global models. In this study, we review and evaluate the variability and evolution of satellite-derived Growing Season Length (GSL) globally and over the past three decades. We used the longest continuous record of Normalized Difference Vegetation Index (NDVI) data available to date at global scale to derive LSP metrics consistently over all vegetated land areas and for the period 1982-2012. We tested GSL, Start-and End-Of Season metrics (SOS and EOS, respectively) for linear trends as well as for significant trend shifts over the study period. We evaluated trends using global environmental stratification information in place of commonly used land cover maps to avoid circular findings. Our results confirmed an average lengthening of the growing season globally during 1982-2012-averaging 0.22-0.34 days/year, but with spatially heterogeneous trends. 13-19% of global land areas displayed significant GSL change, and over 30% of trends occurred in the boreal/alpine biome of the Northern Hemisphere, which showed diverging GSL evolution over the past 3 decades. Within this biome, the "Cold and Mesic" environmental zone appeared as an LSP change hotspot. We also examined the relative contribution of SOS and EOS to the overall changes, finding that EOS trends were generally stronger and more prevalent than SOS trends. These findings constitute a step towards the identification of large-scale phenological drivers of vegetated land surfaces, necessary for improving phenological representation in terrestrial biosphere models.44-6355215 vi. Keywords land surface phenology, GIMMS 3g , vegetation activity, growing season length, spring and autumn phenology ABSTRACT Monitoring Land Surface Phenology (LSP) is important for understanding both the responses and feedbacks of ecosystems to the climate system, and for representing these accurately in terrestrial biosphere models. Moreover, by shedding light on phenological trends at a variety of scales, LSP has the potential to fill the gap between traditional phenological (field) observations and the large-scale view of global models. In this study, we review and evaluate the variability and evolution of satellite-derived Growing Season Length (GSL) globally and over the past three decades. We used the longest continuous record of Normalized Difference Vegetation Index (NDVI) data available to date at global scale to derive LSP metrics consistently over all vegetated land areas and for the period 1982-2012. We tested GSL, Start-and End-Of Season metrics (SOS and EOS, respectively) for linear trends as well as for significant trend shifts over the study period. We evaluated trends usi...

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Section: Shifting Global Lsp Dynamicsmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 97%

Variability and evolution of global land surface phenology over the past three decades (1982–2012)

Garonna

Jong

Schaepman

2016

Global Change Biology

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142

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“…This is visible in our results for example over the boreal and continental areas of Europe, which have been shown to have undergone growing season lengthening over the last decades (Garonna et al 2014) and which presented increasing climatic constraints on either start or end of season in our results (figure 4). In these areas, land management and use/land cover change is known to be a strong driver of land surface phenology change (Karlsen et al 2009, Fuchs et al 2013, Park et al 2015. Another limitation of our analysis is that it does not consider potential effects of increased or decreased nutrient availability or the CO 2 fertilization increase within our study period (Schimel et al 2015, McLauchlan et al 2017, as well as potential changes in minimum requirements for growth within each plant functional type or changes in incoming radiation on vegetated land surfaces (which could be indicated by changing cloud cover, for example).…”

Section: Discussionmentioning

confidence: 99%

Shifting relative importance of climatic constraints on land surface phenology

Garonna

Jong

Stöckli

et al. 2018

Environ. Res. Lett.

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“…Nonetheless, we argue that the weakening positive relationship between vegetation growth and GT in the majority of arctic and tundra climate zones is most likely attributable to two potential drivers (Elmendorf, Henry, Hollister, Björk, Boulanger‐Lapointe, et al, ; Myers‐Smith, Hallinger, et al, ; Tape et al, ). One potential driver is the nonlinear responses of vegetation growth to rapid increases (Figure c) in warm season temperature (Trenberth et al, ; Wu et al, ) interacting with changes in the soil‐water regime (Ackerman et al, ; Myers‐Smith, Elmendorf, et al, ; Park et al, ). Tree ring evidence has revealed weakening positive responses of tree growth to increasing temperatures over the boreal NH (i.e., the divergence problem; Barber et al, ; D'Arrigo et al, ; Wilmking et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Tree ring evidence has revealed weakening positive responses of tree growth to increasing temperatures over the boreal NH (i.e., the divergence problem; Barber et al, ; D'Arrigo et al, ; Wilmking et al, ). Additionally, nonlinear responses of vegetation growth to GT are different between diverse plant functional groups (Park et al, ). This has confirmed our findings that the weakening R NDVI‐GT is more significant in mixed forests than in other forest types.…”

Section: Discussionmentioning

confidence: 99%

Vegetation Greening Despite Weakening Coupling Between Vegetation Growth and Temperature Over the Boreal Region

Guo

Liu

2018

JGR Biogeosciences

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The previously reported strong coupling between interannual variations in vegetation growth and mean growing season temperature in the extratropical (>25°N) Northern Hemisphere (NH) has displayed trends of progressive weakening in recent decades. However, the spatiotemporal patterns and drivers of the weakening coupling and its impacts on vegetation growth across the NH remain poorly understood. Here we address these issues using the vegetation index retrieved from remote sensing, global ecosystem model simulations, and gridded climate data. Our results reveal marked fading of the positive coupling between the mean growing season normalized difference vegetation index (NDVIGS) and mean growing season temperature. Areas with significant positive coupling have shrunk from 31.2% to 20.0% over the periods of 1982–1997 and 1997–2012 across the extratropical NH. Vegetation productivity simulations from global ecosystem models did not capture the above mentioned patterns. There shows a continuous vegetation greening, with a greening rate of 0.0007–0.001 NDVI/year, despite the weakening of the positive coupling in the extratropical NH during the past few decades. Our results highlight that a comprehensive understanding of the underlying processes governing vegetation growth‐climate coupling is urgently needed for accurate predictions of the future trajectories of the response of boreal terrestrial ecosystems to a warmer and more extreme climate regime.

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Nonlinear response of vegetation green-up to local temperature variations in temperate and boreal forests in the Northern Hemisphere

Cited by 64 publications

References 61 publications

Variability and evolution of global land surface phenology over the past three decades (1982–2012)

Variability and evolution of global land surface phenology over the past three decades (1982–2012)

Shifting relative importance of climatic constraints on land surface phenology

Vegetation Greening Despite Weakening Coupling Between Vegetation Growth and Temperature Over the Boreal Region

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