气候变化领域集成服务门户(CCPortal): Evaluation of Land Surface Phenology in Northern Hemisphere Permafrost Regions

CCPortal

DOI	10.1029/2023JG007951
	Evaluation of Land Surface Phenology in Northern Hemisphere Permafrost Regions
	Zhao, Yaohua; Peng, Xiaoqing; Frauenfeld, Oliver W.; Cui, Xia; Bi, Jian; Ma, Xuanlong; Wei, Gang; Mu, Cuicui; Sun, Hao; Sui, Jia
发表日期	2024
ISSN	2169-8953
EISSN	2169-8961
起始页码	129
结束页码	5
卷号	129 期号:5
英文摘要	Vegetation phenology interacts strongly with climate through the exchange of carbon, water, momentum, and energy between terrestrial ecosystem and atmosphere. These vegetation dynamics in Northern Hemisphere permafrost regions have substantial uncertainties in previous studies, partly due to differences in datasets. Thus, reliable land surface phenology (LSP) retrievals are crucial for understanding the effects of climate change on ecosystems and biosphere-atmosphere-hydrosphere interactions. We assessed various LSP datasets at different spatial resolutions for 2001-2014, generated by different methods based on different satellite observations. We also assessed the accuracy of LSP by comparing with CO2 flux phenology. For start of growing season (SOS), the comprehensive evaluation indicated MODIS phenology showed better consistency and higher accuracy with flux-derived phenology observations (R = 0.54, RMSE = 36.2 days, bias<5 days). For end of growing season (EOS), we cannot conclusively determine which LSP performs best. In the Northern Hemisphere permafrost regions, SOS occurred at 100-150 days (April-May), and EOS occurred at 260-320 days (September-November). During 2001-2014, SOS occurred earlier by 0.33 +/- 0.30 days/yr. Significant trends were observed for 6.4%-27.6% of pixels, averaging -1.30 +/- 1.16 days/yr. EOS occurred earlier by 0.25 +/- 0.43 days/yr, with significant trends averaging -0.52 +/- 0.94 days/yr. Among LSPs, variability in EOS trends was significant, with even the direction of trends differing. This study may provide insights into LSP data selection and further understanding of vegetation dynamics and its mechanisms in permafrost regions.
英文关键词	land surface phenology; cold region ecology; remote sensing; permafrost regions
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号	WOS:001220792100001
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301593
作者单位	Lanzhou University; Lanzhou University; Texas A&M University System; Texas A&M University College Station
推荐引用方式 GB/T 7714	Zhao, Yaohua,Peng, Xiaoqing,Frauenfeld, Oliver W.,et al. Evaluation of Land Surface Phenology in Northern Hemisphere Permafrost Regions[J],2024,129(5).
APA	Zhao, Yaohua.,Peng, Xiaoqing.,Frauenfeld, Oliver W..,Cui, Xia.,Bi, Jian.,...&Sui, Jia.(2024).Evaluation of Land Surface Phenology in Northern Hemisphere Permafrost Regions.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,129(5).
MLA	Zhao, Yaohua,et al."Evaluation of Land Surface Phenology in Northern Hemisphere Permafrost Regions".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 129.5(2024).