A global 0.05° dataset for gross primary production of sunlit and shaded vegetation canopies (1992–2020)

Distinguishing gross primary production of sunlit and shaded leaves
(GPPsun and GPPshade) is crucial for improving our understanding of the
underlying mechanisms regulating long-term GPP variations. Here we produce
a global 0.05°, 8-day dataset for GPP, GPPshade and GPPsun over 1992-2020
using an updated two-leaf light use efficiency model (TL-LUE), which is
driven by the GLOBMAP leaf area index, CRUJRA meteorology, and ESA-CCI
land cover. Our products estimate the mean annual totals of global GPP,
GPPsun, and GPPshade over 1992-2020 at 125.0±3.8 (mean ± std) Pg C a-1,
50.5±1.2 Pg C a-1, and 74.5±2.6 Pg C a-1, respectively, in which EBF
(evergreen broadleaf forest) and CRO (crops) contribute more than half of
the totals. They show clear increasing trends over time, in which the
trend of GPP (also GPPsun and GPPshade) for CRO is distinctively greatest,
and that for DBF (deciduous broadleaf forest) is relatively large and
GPPshade overwhelmingly outweighs GPPsun. This new dataset advances our
in-depth understanding of large-scale carbon cycle processes and dynamics.