Tsushima, Akane; Esashi, Nao; Matoba, Sumito; Iizuka, Yoshinori; Adachi, Kouji; Kinase, Takeshi; Hirabayashi, Motohiro; Kawakami, Kaoru; Uemura, Ryu; Kayastha, Rijan B; Fujita, Koji (2025): Major ions in Trambau ice core , Nepal Himalaya [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.974032
Always quote citation above when using data! You can download the citation in several formats below.
Published: 2025-02-10 • DOI registered: 2025-02-10
Abstract:
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.
Coverage:
Latitude: 27.919000 * Longitude: 86.545000
Date/Time Start: 2019-11-03T00:00:00 * Date/Time End: 2019-11-08T00:00:00
Minimum DEPTH, ice/snow: 0.04 m * Maximum DEPTH, ice/snow: 81.17 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, ice/snow | Depth ice/snow | m | Tsushima, Akane | Geocode | |
| 2 | Depth water equivalent | Depth w.e. | m | Tsushima, Akane | ||
| 3 | Age | Age | a AD/CE | Tsushima, Akane | ||
| 4 | Sodium ion | Na+ | µg/kg | Tsushima, Akane | Ion chromatography | |
| 5 | Chloride | Cl- | µg/kg | Tsushima, Akane | Ion chromatography | |
| 6 | Ammonium | [NH4]+ | µg/kg | Tsushima, Akane | Ion chromatography | |
| 7 | Potassium | K+ | µg/kg | Tsushima, Akane | Ion chromatography | |
| 8 | Magnesium | Mg2+ | µg/kg | Tsushima, Akane | Ion chromatography | |
| 9 | Calcium | Ca2+ | µg/kg | Tsushima, Akane | Ion chromatography | |
| 10 | Nitrate | [NO3]- | µg/kg | Tsushima, Akane | Ion chromatography | |
| 11 | Sulfate | [SO4]2- | µg/kg | Tsushima, Akane | Ion chromatography | |
| 12 | Tritium | 3H | TU | Tsushima, Akane | Scintillation | coarse resolution |
| 13 | Tritium | 3H | TU | Tsushima, Akane | Scintillation | fine resolution |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
17586 data points
Download Data
View dataset as HTML (shows only first 2000 rows)