Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau
Permafrost carbon pool destabilization causes substantial fluvial export of soil carbon, yet the export patterns and magnitudes are not well understood. Here we investigated the radiocarbon ( ^14 C) in dissolved organic and inorganic carbon (DOC and DIC, respectively) exported from a mid-sized river...
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Online Access: | https://doi.org/10.1088/1748-9326/ab83ac https://doaj.org/article/1f4c22058569461c8c2c542b84d736e9 |
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ftdoajarticles:oai:doaj.org/article:1f4c22058569461c8c2c542b84d736e9 2023-09-05T13:20:53+02:00 Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau Chunlin Song Genxu Wang Negar Haghipour Peter A Raymond 2020-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/ab83ac https://doaj.org/article/1f4c22058569461c8c2c542b84d736e9 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/ab83ac https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ab83ac 1748-9326 https://doaj.org/article/1f4c22058569461c8c2c542b84d736e9 Environmental Research Letters, Vol 15, Iss 7, p 074012 (2020) riverine carbon export radiocarbon stable carbon isotope permafrost Qinghai-Tibet Plateau river climate warming Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2020 ftdoajarticles https://doi.org/10.1088/1748-9326/ab83ac 2023-08-13T00:37:02Z Permafrost carbon pool destabilization causes substantial fluvial export of soil carbon, yet the export patterns and magnitudes are not well understood. Here we investigated the radiocarbon ( ^14 C) in dissolved organic and inorganic carbon (DOC and DIC, respectively) exported from a mid-sized river in the central Qinghai-Tibet Plateau (QTP) permafrost region. We utilized the radiocarbon dating technique to reveal the ages of riverine dissolved carbon and a statistical model to partition the riverine carbon from different age categories. DOC and DIC showed bomb-depleted ^14 C signatures corresponding to millennial ages. Seasonally, ^14 C-depleted DOC and DIC ages were associated with active layer thaw and flow path deepening. Spatially, older DOC and DIC were found in the valley sites correlated with warmer permafrost and higher groundwater flow. Further, isotopic mixing models suggested that 83 ± 27% of riverine DOC was derived from active layer and permafrost layer aged carbon. DIC export was comprised of a smaller portion of aged carbon (47.3 ± 2.6%) but a much larger flux of aged carbon due to higher annual DIC export. Interestingly, approximately 56% of annual aged DOC and DIC were exported in the short summer season (July to September). The monsoon climate-induced overlap of high discharge and maximum active layer thaw depth in summer enhanced the remarkably rapid fluvial export of millennial-aged carbon. Annual aged carbon yields in YRSR (275 ± 90 and 1661 ± 91 kg km ^−2 yr ^−1 for DOC and DIC, respectively) are much larger than those of Kolyma River (160 ± 89 and 234 ± 105 kg km ^−2 yr ^−1 for DOC and DIC, respectively). These results suggest a unique old carbon loss pattern in the QTP permafrost region compared to higher latitude permafrost regions with a non-monsoonal climate. As climate warms, more old carbon export is expected, which may affect the permafrost carbon pool and the river biogeochemical processes. Article in Journal/Newspaper kolyma river permafrost Directory of Open Access Journals: DOAJ Articles Kolyma ENVELOPE(161.000,161.000,69.500,69.500) Environmental Research Letters 15 7 074012 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
riverine carbon export radiocarbon stable carbon isotope permafrost Qinghai-Tibet Plateau river climate warming Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
riverine carbon export radiocarbon stable carbon isotope permafrost Qinghai-Tibet Plateau river climate warming Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Chunlin Song Genxu Wang Negar Haghipour Peter A Raymond Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau |
topic_facet |
riverine carbon export radiocarbon stable carbon isotope permafrost Qinghai-Tibet Plateau river climate warming Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
Permafrost carbon pool destabilization causes substantial fluvial export of soil carbon, yet the export patterns and magnitudes are not well understood. Here we investigated the radiocarbon ( ^14 C) in dissolved organic and inorganic carbon (DOC and DIC, respectively) exported from a mid-sized river in the central Qinghai-Tibet Plateau (QTP) permafrost region. We utilized the radiocarbon dating technique to reveal the ages of riverine dissolved carbon and a statistical model to partition the riverine carbon from different age categories. DOC and DIC showed bomb-depleted ^14 C signatures corresponding to millennial ages. Seasonally, ^14 C-depleted DOC and DIC ages were associated with active layer thaw and flow path deepening. Spatially, older DOC and DIC were found in the valley sites correlated with warmer permafrost and higher groundwater flow. Further, isotopic mixing models suggested that 83 ± 27% of riverine DOC was derived from active layer and permafrost layer aged carbon. DIC export was comprised of a smaller portion of aged carbon (47.3 ± 2.6%) but a much larger flux of aged carbon due to higher annual DIC export. Interestingly, approximately 56% of annual aged DOC and DIC were exported in the short summer season (July to September). The monsoon climate-induced overlap of high discharge and maximum active layer thaw depth in summer enhanced the remarkably rapid fluvial export of millennial-aged carbon. Annual aged carbon yields in YRSR (275 ± 90 and 1661 ± 91 kg km ^−2 yr ^−1 for DOC and DIC, respectively) are much larger than those of Kolyma River (160 ± 89 and 234 ± 105 kg km ^−2 yr ^−1 for DOC and DIC, respectively). These results suggest a unique old carbon loss pattern in the QTP permafrost region compared to higher latitude permafrost regions with a non-monsoonal climate. As climate warms, more old carbon export is expected, which may affect the permafrost carbon pool and the river biogeochemical processes. |
format |
Article in Journal/Newspaper |
author |
Chunlin Song Genxu Wang Negar Haghipour Peter A Raymond |
author_facet |
Chunlin Song Genxu Wang Negar Haghipour Peter A Raymond |
author_sort |
Chunlin Song |
title |
Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau |
title_short |
Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau |
title_full |
Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau |
title_fullStr |
Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau |
title_full_unstemmed |
Warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the Qinghai-Tibet Plateau |
title_sort |
warming and monsoonal climate lead to large export of millennial-aged carbon from permafrost catchments of the qinghai-tibet plateau |
publisher |
IOP Publishing |
publishDate |
2020 |
url |
https://doi.org/10.1088/1748-9326/ab83ac https://doaj.org/article/1f4c22058569461c8c2c542b84d736e9 |
long_lat |
ENVELOPE(161.000,161.000,69.500,69.500) |
geographic |
Kolyma |
geographic_facet |
Kolyma |
genre |
kolyma river permafrost |
genre_facet |
kolyma river permafrost |
op_source |
Environmental Research Letters, Vol 15, Iss 7, p 074012 (2020) |
op_relation |
https://doi.org/10.1088/1748-9326/ab83ac https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/ab83ac 1748-9326 https://doaj.org/article/1f4c22058569461c8c2c542b84d736e9 |
op_doi |
https://doi.org/10.1088/1748-9326/ab83ac |
container_title |
Environmental Research Letters |
container_volume |
15 |
container_issue |
7 |
container_start_page |
074012 |
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1776201496955715584 |