Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan Plateau
Abstract Land surface greening has substantially changed the carbon sequestration and hydrological processes over Tibetan Plateau (TP). Previous studies have revealed that the increased total precipitation (Ptotal) is the main driver of the enhanced peak growth in TP. However, the role of precipitat...
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| Format: | Article |
| Language: | English |
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Wiley
2022-08-01
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| Series: | Earth's Future |
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| Online Access: | https://doi.org/10.1029/2022EF002760 |
| _version_ | 1811282914572238848 |
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| author | Ying Liu Chaoyang Wu Rachhpal S. Jassal Xiaoyue Wang Rong Shang |
| author_facet | Ying Liu Chaoyang Wu Rachhpal S. Jassal Xiaoyue Wang Rong Shang |
| author_sort | Ying Liu |
| collection | DOAJ |
| description | Abstract Land surface greening has substantially changed the carbon sequestration and hydrological processes over Tibetan Plateau (TP). Previous studies have revealed that the increased total precipitation (Ptotal) is the main driver of the enhanced peak growth in TP. However, the role of precipitation pattern, especially the frequency of precipitation (Pfreq, number of rainy days [>0.1 mm]), has not been well analyzed. We used time series of satellite‐derived Normalized Difference Vegetation Index (NDVI) to investigate the effect of Pfreq in controlling the peak growth (the maximum of the NDVI [NDVImax]) of different vegetation types in TP for the period of 1982–2015. We found that the widespread greening trend with Ptotal disappeared when Pfreq was introduced as a controlling variable, and that Pfreq alone contributed more than Ptotal to the increase of NDVImax. The underlying mechanism for the higher contribution of Pfreq than Ptotal to NDVImax is that increased Pfreq significantly improved soil moisture, reduced daytime temperature while increased nighttime temperature, thereby alleviating summer drought. Our results highlight the importance of Pfreq in interpreting the variation of peak growth, and these effects might be better represented in ecosystem models by considering Pfreq rather than Ptotal alone with future climate change. |
| first_indexed | 2024-04-13T02:01:06Z |
| format | Article |
| id | doaj.art-f59fb499d0ac4ca0834cab1e576b21de |
| institution | Directory Open Access Journal |
| issn | 2328-4277 |
| language | English |
| last_indexed | 2024-04-13T02:01:06Z |
| publishDate | 2022-08-01 |
| publisher | Wiley |
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| series | Earth's Future |
| spelling | doaj.art-f59fb499d0ac4ca0834cab1e576b21de2022-12-22T03:07:38ZengWileyEarth's Future2328-42772022-08-01108n/an/a10.1029/2022EF002760Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan PlateauYing Liu0Chaoyang Wu1Rachhpal S. Jassal2Xiaoyue Wang3Rong Shang4The Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing ChinaThe Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing ChinaUniversity of British Columbia Vancouver BC CanadaThe Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing ChinaKey Laboratory for Humid Subtropical Eco‐geographical Process of the Ministry of Education School of Geographical Sciences Fujian Normal University Fuzhou ChinaAbstract Land surface greening has substantially changed the carbon sequestration and hydrological processes over Tibetan Plateau (TP). Previous studies have revealed that the increased total precipitation (Ptotal) is the main driver of the enhanced peak growth in TP. However, the role of precipitation pattern, especially the frequency of precipitation (Pfreq, number of rainy days [>0.1 mm]), has not been well analyzed. We used time series of satellite‐derived Normalized Difference Vegetation Index (NDVI) to investigate the effect of Pfreq in controlling the peak growth (the maximum of the NDVI [NDVImax]) of different vegetation types in TP for the period of 1982–2015. We found that the widespread greening trend with Ptotal disappeared when Pfreq was introduced as a controlling variable, and that Pfreq alone contributed more than Ptotal to the increase of NDVImax. The underlying mechanism for the higher contribution of Pfreq than Ptotal to NDVImax is that increased Pfreq significantly improved soil moisture, reduced daytime temperature while increased nighttime temperature, thereby alleviating summer drought. Our results highlight the importance of Pfreq in interpreting the variation of peak growth, and these effects might be better represented in ecosystem models by considering Pfreq rather than Ptotal alone with future climate change.https://doi.org/10.1029/2022EF002760climate changepeak vegetation growthprecipitationremote sensingNDVI |
| spellingShingle | Ying Liu Chaoyang Wu Rachhpal S. Jassal Xiaoyue Wang Rong Shang Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan Plateau Earth's Future climate change peak vegetation growth precipitation remote sensing NDVI |
| title | Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan Plateau |
| title_full | Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan Plateau |
| title_fullStr | Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan Plateau |
| title_full_unstemmed | Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan Plateau |
| title_short | Satellite Observed Land Surface Greening in Summer Controlled by the Precipitation Frequency Rather Than Its Total Over Tibetan Plateau |
| title_sort | satellite observed land surface greening in summer controlled by the precipitation frequency rather than its total over tibetan plateau |
| topic | climate change peak vegetation growth precipitation remote sensing NDVI |
| url | https://doi.org/10.1029/2022EF002760 |
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