The evolution of precipitation and its physical mechanisms in arid and humid regions of the Tibetan Plateau

Li, Guiping; Yu, Zhigang; Li, Yanping; Li, Zhenhua; Ju, Qin; Huang, Ya

doi:10.1016/j.atmosres.2023.106638

Cited by 3 publications

(2 citation statements)

References 51 publications

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“…The TP also contains the most extensive area of permafrost (1.1 × 10 6 km 2 , occupying ~40% of the plateau area) in mid-low latitude regions 37 . Field and satellite observations indicate an ongoing vegetation greening on the TP over recent decades [38][39][40] , owing to CO 2 fertilization effects, climate warming, and implementation of ecological restoration programs 4,41,42 . Among these diving factors, climate change contributes the most to vegetation greening of the TP 43 .…”

Section: Vegetation Greening Amplifies Shallow Soil Temperature Warmi...mentioning

confidence: 99%

Vegetation greening amplifies shallow soil temperature warming on the Tibetan Plateau

Li,

Wang,

Chen

2024

npj Clim Atmos Sci

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Vegetation changes are expected to alter soil thermal regimes, consequently modifying climate feedbacks related to frozen ground thawing and carbon cycling in cold regions. The Tibetan Plateau (TP) contains diverse alpine ecosystems and the largest area of frozen ground in low–mid latitude regions. Evidence suggests ongoing vegetation greening and permafrost degradation during the past several decades on the TP. However, the effect of vegetation changes on soil thermal regimes on the TP is not well understood. Here, we quantify the response of shallow soil temperature change to vegetation greening on the TP using remote–sensing data, in–situ observations, and physics–based modelling. Our results show that over the past 20 years, vegetation greening on the TP was accompanied a notable decrease in the area of bare land by approximately 0.7% (5000 km2). Annual mean soil temperature showed a significant warming trend of 0.57 °C decade–1 (p < 0.05) during the period 1983–2019, exceeding the warming rate of surface air temperature. Changes in vegetation resulted in a warming effect on annual shallow soil temperature of 0.15 ± 0.33 °C across the TP during the period 2000–2019. The warming effect varies with frozen soil types: 0.24 ± 0.48 °C in permafrost, 0.18 ± 0.36 °C in seasonally frozen ground, and 0.11 ± 0.32 °C in unfrozen ground. The net warming effect was caused by a decrease in albedo and increase in radiation penetrating the canopy, outweighing the cooling effect related to a limited increase in evapotranspiration.

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Section: Vegetation Greening Amplifies Shallow Soil Temperature Warmi...mentioning

confidence: 99%

Vegetation greening amplifies shallow soil temperature warming on the Tibetan Plateau

Li,

Wang,

Chen

2024

npj Clim Atmos Sci

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“…During the summer months, the southern TP experiences increased precipitation owing to ample water vapor transport, alongside the presence of active plateau low vortices and shear lines [31,32]. The intricate interplay of complex topography and the Asian monsoon engenders intricate spatial and temporal patterns of summer precipitation on the TP [33][34][35]. Therefore, it is imperative to undertake further evaluations of multi-source summer precipitation datasets tailored to the TP's unique characteristics.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Error Analysis of Multi-Source Precipitation Datasets during Summer over the Tibetan Plateau

Zhao,

Zhong

2024

Atmosphere

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Due to the scarcity of meteorological stations on the Tibetan Plateau (TP), owing to the high altitude and harsh climate, studies often resort to satellite, reanalysis, and merged multi-source precipitation data. This necessitates an evaluation of TP precipitation data applicability. Here, we assess the following three high-resolution gridded precipitation datasets: the China Meteorological Forcing Dataset (CMFD), the European Center for Medium-Range Weather Forecasts Reanalysis V5-Land (ERA5-Land), and Integrated Multi-satellitE Retrievals for Global Precipitation Measurement (IMERG) during TP summers. Using observations from the original 133 China Meteorological Administration stations on the TP as a reference, the evaluation yielded the following conclusions: (1) In summer, from 2000 to 2018, discrepancies among the datasets were largest in the western TP. The CMFD showed the smallest deviation from the observations, and the annual summer precipitation was only overestimated by 12.3 mm. ERA5-Land had the closest trend (0.41 mm/y) to the annual mean summer precipitation, whereas it overestimated the highest precipitation (>150 mm). (2) The reliability of the three datasets at annual and monthly scales was in the following order: CMFD, ERA5-Land, and IMERG. The daily scales exhibited a lower accuracy than the monthly scales (correlation coefficient CC of 0.51, 0.38, and 0.26, respectively). (3) The CMFD assessments, referencing the 114 new stations post-2016, had a notably lower accuracy and precipitation capture capability at the daily scale (CC and critical success index (CSI) decreased by 0.18 and 0.1, respectively). These results can aid in selecting appropriate datasets for refined climate predictions on the TP.

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Compound events of wet and dry extremes: Identification, variations, and risky patterns

Chen,

Tuo,

et al. 2023

Science of The Total Environment

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The evolution of precipitation and its physical mechanisms in arid and humid regions of the Tibetan Plateau

Cited by 3 publications

References 51 publications

Vegetation greening amplifies shallow soil temperature warming on the Tibetan Plateau

Vegetation greening amplifies shallow soil temperature warming on the Tibetan Plateau

Evaluation and Error Analysis of Multi-Source Precipitation Datasets during Summer over the Tibetan Plateau

Compound events of wet and dry extremes: Identification, variations, and risky patterns

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