ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region
Study region: The source region of Yangtze River (SRYR) Study focus: Better understanding the influence of soil freeze/thaw (F/T) activity on runoff production is vital for cold regions like the Qinghai-Tibet Plateau. While global reanalysis products offer full spatial coverage and fine temporal res...
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ftdoajarticles:oai:doaj.org/article:b0fc92037b8949a2a1e3f5403047d0ab 2024-09-15T18:29:46+00:00 ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region Li Liu Yonghong Yi Huiru Jiang Youhua Ran Deliang Chen 2024-06-01T00:00:00Z https://doi.org/10.1016/j.ejrh.2024.101792 https://doaj.org/article/b0fc92037b8949a2a1e3f5403047d0ab EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S221458182400140X https://doaj.org/toc/2214-5818 2214-5818 doi:10.1016/j.ejrh.2024.101792 https://doaj.org/article/b0fc92037b8949a2a1e3f5403047d0ab Journal of Hydrology: Regional Studies, Vol 53, Iss , Pp 101792- (2024) ERA5-Land Runoff recession Runoff coefficient Freeze/thaw dynamics Tibetan permafrost region Physical geography GB3-5030 Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.1016/j.ejrh.2024.101792 2024-08-05T17:49:14Z Study region: The source region of Yangtze River (SRYR) Study focus: Better understanding the influence of soil freeze/thaw (F/T) activity on runoff production is vital for cold regions like the Qinghai-Tibet Plateau. While global reanalysis products offer full spatial coverage and fine temporal resolution for runoff estimates, their accuracy in depicting runoff dynamics within permafrost-dominated regions remains uncertain. To address this gap, a thorough assessment of the ERA5-Land runoff products within the SRYR was undertaken to determine their effectiveness in representing specific permafrost hydrological mechanisms. New hydrological insights for the region: Our analysis reveals that ERA5-Land adequately captures the intra-annual variability of runoff, but tends to overestimate runoff coefficients while underestimate runoff recession rates. The monthly runoff coefficient fluctuates during the thaw season, showing decreasing trends from May to increasing trends after July. The runoff recession rate generally shifts from acceleration to retardation during the freezing period (October-March), influenced significantly by snow cover and soil F/T dynamics. There's a discernible delay in the observed transition time (0.3 days/a) of runoff recession from 1980 to 2020, closely linked (R>0.35, p<0.05) to soil F/T indices. Notably, the simulated transition time lacks significant trends, and displays contrasting correlations with soil F/T indices. This highlights a critical need for the ERA5-Land model to refine its representation of soil F/T dynamics, particularly snow physics and soil thermal schemes. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Journal of Hydrology: Regional Studies 53 101792 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ERA5-Land Runoff recession Runoff coefficient Freeze/thaw dynamics Tibetan permafrost region Physical geography GB3-5030 Geology QE1-996.5 |
spellingShingle |
ERA5-Land Runoff recession Runoff coefficient Freeze/thaw dynamics Tibetan permafrost region Physical geography GB3-5030 Geology QE1-996.5 Li Liu Yonghong Yi Huiru Jiang Youhua Ran Deliang Chen ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region |
topic_facet |
ERA5-Land Runoff recession Runoff coefficient Freeze/thaw dynamics Tibetan permafrost region Physical geography GB3-5030 Geology QE1-996.5 |
description |
Study region: The source region of Yangtze River (SRYR) Study focus: Better understanding the influence of soil freeze/thaw (F/T) activity on runoff production is vital for cold regions like the Qinghai-Tibet Plateau. While global reanalysis products offer full spatial coverage and fine temporal resolution for runoff estimates, their accuracy in depicting runoff dynamics within permafrost-dominated regions remains uncertain. To address this gap, a thorough assessment of the ERA5-Land runoff products within the SRYR was undertaken to determine their effectiveness in representing specific permafrost hydrological mechanisms. New hydrological insights for the region: Our analysis reveals that ERA5-Land adequately captures the intra-annual variability of runoff, but tends to overestimate runoff coefficients while underestimate runoff recession rates. The monthly runoff coefficient fluctuates during the thaw season, showing decreasing trends from May to increasing trends after July. The runoff recession rate generally shifts from acceleration to retardation during the freezing period (October-March), influenced significantly by snow cover and soil F/T dynamics. There's a discernible delay in the observed transition time (0.3 days/a) of runoff recession from 1980 to 2020, closely linked (R>0.35, p<0.05) to soil F/T indices. Notably, the simulated transition time lacks significant trends, and displays contrasting correlations with soil F/T indices. This highlights a critical need for the ERA5-Land model to refine its representation of soil F/T dynamics, particularly snow physics and soil thermal schemes. |
format |
Article in Journal/Newspaper |
author |
Li Liu Yonghong Yi Huiru Jiang Youhua Ran Deliang Chen |
author_facet |
Li Liu Yonghong Yi Huiru Jiang Youhua Ran Deliang Chen |
author_sort |
Li Liu |
title |
ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region |
title_short |
ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region |
title_full |
ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region |
title_fullStr |
ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region |
title_full_unstemmed |
ERA5-Land overestimates runoff coefficient but underestimates runoff recession rate in the central Tibetan permafrost region |
title_sort |
era5-land overestimates runoff coefficient but underestimates runoff recession rate in the central tibetan permafrost region |
publisher |
Elsevier |
publishDate |
2024 |
url |
https://doi.org/10.1016/j.ejrh.2024.101792 https://doaj.org/article/b0fc92037b8949a2a1e3f5403047d0ab |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Journal of Hydrology: Regional Studies, Vol 53, Iss , Pp 101792- (2024) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S221458182400140X https://doaj.org/toc/2214-5818 2214-5818 doi:10.1016/j.ejrh.2024.101792 https://doaj.org/article/b0fc92037b8949a2a1e3f5403047d0ab |
op_doi |
https://doi.org/10.1016/j.ejrh.2024.101792 |
container_title |
Journal of Hydrology: Regional Studies |
container_volume |
53 |
container_start_page |
101792 |
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1810471197991763968 |