Preprints
https://doi.org/10.5194/essd-2022-436
https://doi.org/10.5194/essd-2022-436
17 Jan 2023
 | 17 Jan 2023
Status: a revised version of this preprint was accepted for the journal ESSD and is expected to appear here in due course.

A grid dataset of leaf age-dependent LAI seasonality product (Lad-LAI) over tropical and subtropical evergreen broadleaved forests

Xueqin Yang, Xiuzhi Chen, Jiashun Ren, Wenping Yuan, Liyang Liu, Juxiu Liu, Dexiang Chen, Yihua Xiao, Shengbiao Wu, Lei Fan, Xiaoai Dai, and Yongxian Su

Abstract. Quantification of large-scale leaf age-dependent leaf area index has been lacking in tropical and subtropical evergreen broadleaved forests (TEFs) despite the recognized importance of leaf age in influencing leaf photosynthetic capacity in this region. Here, we simplified the canopy leaves of TEFs into three age cohorts, i.e., young, mature and old one, with different photosynthesis capacity (Vc,max) and produced a first grid dataset of leaf age-dependent LAI product (referred to as Lad-LAI) over the continental scale from satellite observations of TROPOMI (the TROPOspheric Monitoring Instrument) sun-induced chlorophyll fluorescence (SIF) as a proxy of leaf photosynthesis. The seasonality of three LAI cohorts from the new Lad-LAI products agree well at the three sites (one in subtropical Asia and two in Amazon) with very fine collections of monthly LAI of young, mature and old leaves. Continental-scale comparisons with independent Moderate-resolution Imaging Spectroradiometer (MODIS) Enhanced Vegetation Index (EVI) products and 53 samples of in situ measurements of seasonal litterfall data also demonstrate the robustness of the LAI seasonality of the three leaf age cohorts. The spatial patterns clustered from the three LAI cohorts coincides with those clustered from climatic variables. And the young and mature LAI cohorts perform well in capturing a dry-season green-up of canopy leaves across the wet Amazonia areas where mean annual precipitation exceeds 2,000 mm yr−1, consistent with previous satellite data analysis. The new Lad-LAI products are primed to diagnose the adaption of tropical and subtropical forest to climate change; and will also help improve the development of phenology modules in Earth System Models. The proposed satellite-based approaches can provide reference for mapping finer temporal and spatial resolution LAI products with different leaf age cohorts. The Lad-LAI products are available at https://doi.org/10.6084/m9.figshare.21700955.v2 (Yang et al., 2022).

Xueqin Yang et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-436', Anonymous Referee #1, 02 Feb 2023
    • AC1: 'Reply on RC1', Xueqin Yang, 10 Apr 2023
  • RC2: 'Comment on essd-2022-436', Anonymous Referee #2, 12 Feb 2023
    • AC2: 'Reply on RC2', Xueqin Yang, 10 Apr 2023
  • RC3: 'Comment on essd-2022-436', Anonymous Referee #3, 13 Feb 2023
    • AC3: 'Reply on RC3', Xueqin Yang, 10 Apr 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-436', Anonymous Referee #1, 02 Feb 2023
    • AC1: 'Reply on RC1', Xueqin Yang, 10 Apr 2023
  • RC2: 'Comment on essd-2022-436', Anonymous Referee #2, 12 Feb 2023
    • AC2: 'Reply on RC2', Xueqin Yang, 10 Apr 2023
  • RC3: 'Comment on essd-2022-436', Anonymous Referee #3, 13 Feb 2023
    • AC3: 'Reply on RC3', Xueqin Yang, 10 Apr 2023

Xueqin Yang et al.

Data sets

Leaf age-dependent LAI seasonality product (Lad-LAI) over tropical and subtropical evergreen broadleaved forests Xueqin Yang, Xiuzhi Chen, Jiashun Ren, Wenping Yuan, Liyang Liu, Juxiu Liu, Dexiang Chen, Yihua Xiao, Shengbiao Wu, Lei Fan, Xiaoai Dai, Yongxian Su https://doi.org/10.6084/m9.figshare.21700955.v2

Xueqin Yang et al.

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Short summary
We for the first-time mapped continental-scale grid dataset of monthly LAI in three leaf age cohorts, i.e., young, mature and old one, from 2001–2018 RTSIF data (referred to as Lad-LAI). The seasonality of three LAI cohorts from the new Lad-LAI products agree well at the three sites with very fine collections of monthly LAI. The proposed satellite-based approaches can provide reference for mapping finer temporal and spatial resolution LAI products with different leaf age cohorts.