Decreased Sensitivity of Grassland Spring Phenology to Temperature on the Tibetan Plateau

Chen, Z; Chen, R; Yang, Y; Pan, H; Xie, Q; Wang, C; Xu, B; Yin, G

Decreased Sensitivity of Grassland Spring Phenology to Temperature on the Tibetan Plateau

Chen, Z Chen, R Yang, Y Pan, H Xie, Q

Wang, C Xu, B Yin, G

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Publisher:: Institute of Electrical and Electronics Engineers (IEEE)
Publication Type:: Journal Article
Citation:: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023, 16, pp. 4371-4382
Issue Date:: 2023-01-01

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Field	Value	Language
dc.contributor.author	Chen, Z
dc.contributor.author	Chen, R
dc.contributor.author	Yang, Y
dc.contributor.author	Pan, H
dc.contributor.author	Xie, Q https://orcid.org/0000-0002-1576-6610
dc.contributor.author	Wang, C
dc.contributor.author	Xu, B
dc.contributor.author	Yin, G
dc.date.accessioned	2024-03-11T00:58:24Z
dc.date.available	2024-03-11T00:58:24Z
dc.date.issued	2023-01-01
dc.identifier.citation	IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023, 16, pp. 4371-4382
dc.identifier.issn	1939-1404
dc.identifier.issn	2151-1535
dc.identifier.uri	http://hdl.handle.net/10453/176429
dc.description.abstract	Spring phenology is a critical indicator to characterize vegetation dynamics and their responses to climate change. Spring phenology on the Tibetan Plateau (TP) has received extensive attentions as it has experienced one of the most rapid warmings. Warming-induced advancement of spring phenology has been revealed by many studies, however, the underlying mechanisms remain obscure. In this article, we derived the start of growing season (SOS) from the satellite solar-induced chlorophyll fluorescence (SIF) and investigated the spatial and temporal variations of SOS over grasslands on the TP during 2001-2020. The temperature sensitivity (St) of SOS was then analyzed, i.e., the slope of a linear regression between the advanced SOS and preseason air temperature. Results showed an average advanced trend of 0.29 days per decade of SOS, although not statistically significant. Spatially, grasslands in eastern TP showed an earlier trend of SOS whilst those in western TP showed a later trend of SOS. The spatial distribution of St was much more affected by precipitation and air temperature, i.e., a 1 mm decrease of precipitation and 1 °C warming incur a decrease in St of 0.02 and 0.54 day/°C, respectively. Temporally, St showed a significant decrease with an average speed of 0.14 day/°C per year during 2001-2020, and the climate controllers show a high spatial heterogeneity. These findings improved our understanding of grasslands spring phenology responses to warming and help us clarify future global water and energy cycles.
dc.language	en
dc.publisher	Institute of Electrical and Electronics Engineers (IEEE)
dc.relation.ispartof	IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
dc.relation.isbasedon	10.1109/JSTARS.2023.3269908
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0406 Physical Geography and Environmental Geoscience, 0801 Artificial Intelligence and Image Processing, 0909 Geomatic Engineering
dc.subject.classification	3709 Physical geography and environmental geoscience
dc.subject.classification	4013 Geomatic engineering
dc.subject.classification	4601 Applied computing
dc.title	Decreased Sensitivity of Grassland Spring Phenology to Temperature on the Tibetan Plateau
dc.type	Journal Article
utslib.citation.volume	16
utslib.for	0406 Physical Geography and Environmental Geoscience
utslib.for	0801 Artificial Intelligence and Image Processing
utslib.for	0909 Geomatic Engineering
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
utslib.copyright.status	open_access	*
dc.date.updated	2024-03-11T00:58:21Z
pubs.publication-status	Published
pubs.volume	16

Abstract:

Spring phenology is a critical indicator to characterize vegetation dynamics and their responses to climate change. Spring phenology on the Tibetan Plateau (TP) has received extensive attentions as it has experienced one of the most rapid warmings. Warming-induced advancement of spring phenology has been revealed by many studies, however, the underlying mechanisms remain obscure. In this article, we derived the start of growing season (SOS) from the satellite solar-induced chlorophyll fluorescence (SIF) and investigated the spatial and temporal variations of SOS over grasslands on the TP during 2001-2020. The temperature sensitivity (St) of SOS was then analyzed, i.e., the slope of a linear regression between the advanced SOS and preseason air temperature. Results showed an average advanced trend of 0.29 days per decade of SOS, although not statistically significant. Spatially, grasslands in eastern TP showed an earlier trend of SOS whilst those in western TP showed a later trend of SOS. The spatial distribution of St was much more affected by precipitation and air temperature, i.e., a 1 mm decrease of precipitation and 1 °C warming incur a decrease in St of 0.02 and 0.54 day/°C, respectively. Temporally, St showed a significant decrease with an average speed of 0.14 day/°C per year during 2001-2020, and the climate controllers show a high spatial heterogeneity. These findings improved our understanding of grasslands spring phenology responses to warming and help us clarify future global water and energy cycles.

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http://hdl.handle.net/10453/176429