Lagged feedback of peak season photosynthetic activities on local surface temperature in Inner Mongolia, China
Environmental Research, ISSN: 0013-9351, Vol: 236, Issue: Pt 1, Page: 116643
2023
- 2Citations
- 4Captures
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Article Description
Increased vegetation peak growth and phenological shifts toward spring have been observed in response to climate warming in the temperate regions. Such changes have the potential to modify warming by perturbing land‒atmosphere energy exchanges; however, the signs and magnitudes of biophysical feedback on surface temperature in different biomes are largely unknown. Here, we synthesized information from vegetation growth proxies, land surface temperature (LST), and surface energy balance factors (surface evapotranspiration (ET), albedo, and broadband emissivity (BBE)) to investigate the variations in timing (PPT) and productivity (PP max ) of seasonal peak photosynthesis and their time-lagged biophysical feedbacks to the post-season LST in Inner Mongolia (IM) during 2001–2020. We found that increased PP max, rather than advanced PPT, exhibited a significant impact on LST, with divergent signs and magnitudes across diurnal periods and among different biomes. In the grassland biome, increased PP max cooled both LST during daytime (LST day ) and nighttime (LST night ) throughout the post-season period, with a more pronounced response during daytime and diminishing gradually from July to September. This cooling effect on LST was primarily attributed to enhanced ET, as evidenced by the greater effect of ET cooling than that of albedo warming and BBE cooling based on a structural equation model (SEM). In the forest biome, increased PP max led to a symmetrical warming effect on LST day and LST night, and none of the surface energy balance factors were identified as significant intermediate explanatory factors for the observed warming effect. Moreover, the responses of average LST (LST mean ) and diurnal temperature range of LST (LST DTR ) to variations in PP max were consistent with those of LST day at two biomes. The observations above elucidate the divergent feedback mechanisms of vegetation peak growth on LST among different biomes and diurnal cycles, which could facilitate the improvement of the realistic parameterization of surface processes in global climate models.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0013935123014470; http://dx.doi.org/10.1016/j.envres.2023.116643; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85166339583&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/37442253; https://linkinghub.elsevier.com/retrieve/pii/S0013935123014470; https://dx.doi.org/10.1016/j.envres.2023.116643
Elsevier BV
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