Methodological challenges and new perspectives of shifting vegetation phenology in eddy covariance data.

ABSTRACT: While numerous studies report shifts in vegetation phenology, in this regard eddy covariance (EC) data, despite its continuous high-frequency observations, still requires further exploration. Furthermore, there is no general consensus on optimal methodologies for data smoothing and extracting phenological transition dates (PTDs). Here, we revisit existing methodologies and present new prospects to investigate phenological changes in gross primary productivity (GPP) from EC measurements. First, we present a smoothing technique of GPP time series through the derivative of its smoothed annual cumulative sum. Second, we calculate PTDs and their trends from a commonly used threshold method that identifies days with a fixed percentage of the annual maximum GPP. A systematic analysis is performed

SUBMITTER: Panwar A 

PROVIDER: S-EPMC10449856 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature