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| Main Authors: | , , , , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2025
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.974032 |
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| _version_ | 1867168231798603776 |
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| author | Tsushima, Akane Esashi, Nao Matoba, Sumito Iizuka, Yoshinori Adachi, Kouji Kinase, Takeshi Hirabayashi, Motohiro Kawakami, Kaoru Uemura, Ryu Kayastha, Rijan B Fujita, Koji |
| author_facet | Tsushima, Akane Esashi, Nao Matoba, Sumito Iizuka, Yoshinori Adachi, Kouji Kinase, Takeshi Hirabayashi, Motohiro Kawakami, Kaoru Uemura, Ryu Kayastha, Rijan B Fujita, Koji |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | An 81.2-m-long ice core was drilled in November 2019 at 5862m a.s.l. of Trambau Glacier, Rolwaling region, Nepal Himalaya.For the analysis, ice-core samples were prepared to measure major ion and tritium concentrations in the cold laboratory (-20 degC) at the Institute of Low-Temperature Science, Hokkaido University, Japan. We used a bandsaw to cut the core into 0.05 m sections. To minimize the risk of contamination (e.g., from drilling and transportation), we used a ceramic knife in a positive-pressure environment to shave off the outer surface of each sample. Decontaminated samples (n = 1592) were then packed in clean, sealed polyethylene bags and melted at ambient temperature, after which the resulting water was transferred to polypropylene bottles for storage. Concentrations of major water-soluble ions were quantified using Dionex ICS-1100 and ICS-2100 ion chromatography systems (Thermo Scientific). The measurement precision for each ionic species was 10%; we corrected measurement bias by multiple measurements of the same sample. Tritium concentrations were analyzed by liquid scintillation counting (LSC-LB3; Aloka, Japan) at the National Institute of Polar Research. First, we measured all layers at a coarse resolution (2.5 m intervals, n = 32 samples) by mixing each 1 mL from every 50 samples. To confirm the data at depths at which high tritium concentrations were measured, we made a second measurement for ice layers at depths between 29.77 and 35.11 m (0.25 m intervals, n = 20 samples) by mixing each 10 mL from every 5 samples. This data set contains the concentrations of major ions (Na, Cl, NH4, K, Mg, Ca, NO3, SO4) and tritium concentrations of the ice core. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_974032 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Major ions in Trambau ice core , Nepal Himalaya Tsushima, Akane Esashi, Nao Matoba, Sumito Iizuka, Yoshinori Adachi, Kouji Kinase, Takeshi Hirabayashi, Motohiro Kawakami, Kaoru Uemura, Ryu Kayastha, Rijan B Fujita, Koji Age; Ammonium; Calcium; Chloride; DEPTH, ice/snow; Depth water equivalent; Himalaya; Ice core; ICEDRILL; Ice drill; Ion chromatography; Magnesium; Nitrate; Potassium; Scintillation; Sodium ion; Sulfate; Trambau_Ice_Core; Tritium An 81.2-m-long ice core was drilled in November 2019 at 5862m a.s.l. of Trambau Glacier, Rolwaling region, Nepal Himalaya.For the analysis, ice-core samples were prepared to measure major ion and tritium concentrations in the cold laboratory (-20 degC) at the Institute of Low-Temperature Science, Hokkaido University, Japan. We used a bandsaw to cut the core into 0.05 m sections. To minimize the risk of contamination (e.g., from drilling and transportation), we used a ceramic knife in a positive-pressure environment to shave off the outer surface of each sample. Decontaminated samples (n = 1592) were then packed in clean, sealed polyethylene bags and melted at ambient temperature, after which the resulting water was transferred to polypropylene bottles for storage. Concentrations of major water-soluble ions were quantified using Dionex ICS-1100 and ICS-2100 ion chromatography systems (Thermo Scientific). The measurement precision for each ionic species was 10%; we corrected measurement bias by multiple measurements of the same sample. Tritium concentrations were analyzed by liquid scintillation counting (LSC-LB3; Aloka, Japan) at the National Institute of Polar Research. First, we measured all layers at a coarse resolution (2.5 m intervals, n = 32 samples) by mixing each 1 mL from every 50 samples. To confirm the data at depths at which high tritium concentrations were measured, we made a second measurement for ice layers at depths between 29.77 and 35.11 m (0.25 m intervals, n = 20 samples) by mixing each 10 mL from every 5 samples. This data set contains the concentrations of major ions (Na, Cl, NH4, K, Mg, Ca, NO3, SO4) and tritium concentrations of the ice core. |
| title | Major ions in Trambau ice core , Nepal Himalaya |
| topic | Age; Ammonium; Calcium; Chloride; DEPTH, ice/snow; Depth water equivalent; Himalaya; Ice core; ICEDRILL; Ice drill; Ion chromatography; Magnesium; Nitrate; Potassium; Scintillation; Sodium ion; Sulfate; Trambau_Ice_Core; Tritium |
| url | https://doi.org/10.1594/PANGAEA.974032 |