4aa19957-83a6-83c9-e063-3050940a8dd4 English dataset British Geological Survey +44 115 936 3100 Environmental Science Centre,Keyworth NOTTINGHAM NOTTINGHAMSHIRE NG12 5GG United Kingdom enquiries@bgs.ac.uk pointOfContact 2026-04-15 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13608626 WGS 84 (EPSG::4326) Multi-season Himalayan spring, stream and rainwater geochemical data set from the Melamchi Valley catchment, Nepal (2022 - 2025) 2026-02-10 creation http://data.bgs.ac.uk/id/dataHolding/13608626 This dataset contains geochemical data from springs, streams and monsoonal rainwater samples, collected from the Melamchi Valley catchment, Nepal, between 2022 and 2025. The data includes analysis of major ions, stable water isotopes and Sr, Li, Si and C isotopes to investigate chemical weathering along mountain flow paths. Filtered water samples were collected across the Melamchi Valley catchment, with springs grouped into sub-linear transects. Additional time series samples span 2023 to 2025 at bi/weekly sampling at 5 sites. Michael Bickle University of Cambridge Department of Earth Sciences Cambridge CB2 3EQ not available originator Dr Edward Tipper University of Cambridge Department of Earth Sciences Downing Street Cambridge CB2 3EQ not available originator Zara Crapper University of Cambridge not available originator Mohd Tarique University of Cambridge not available originator Giovanni Bernardi University of Cambridge not available originator Alasdair C G Knight University of Cambridge not available originator Jade A Westfoot University of Cambridge not available originator Oliver T Crofts University of Cambridge not available originator Archie C Taylor University of Cambridge not available originator Alexandra V Turchyn University of Cambridge not available originator Enquiries British Geological Survey United Kingdom not available distributor Enquiries British Geological Survey United Kingdom not available pointOfContact notApplicable https://resources.bgs.ac.uk/images/geonetworkThumbs/4aa19957-83a6-83c9-e063-3050940a8dd4.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Chemical weathering Water chemistry Water Isotopes Springs BGS Thesaurus of Geosciences 2022 revision NGDC Deposited Data Citable Data dataCentre NERC_DDC otherRestrictions licenceOGL Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" otherRestrictions The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused. Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]" vector English geoscientificInformation British Geological Survey Gazetteer: Geographical hierarchy from Geosaurus 1979 creation NEPAL [id=497000] ISO 3166_1 alpha-2 2009 revision NP ISO 3166_1 alpha-3 2009 revision NPL 85.5200 85.6100 27.8200 28.0300 2022-10-29 2025-09-22 Microsoft Excel (CSV) Enquiries British Geological Survey United Kingdom not available distributor https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item191485 WWW:DOWNLOAD-1.0-http--download Data download https://doi.org/10.5285/b93b2ce1-7b33-43ef-974e-e2eab40c11f8 WWW:LINK-1.0-http--related Citation Information - Digital Object Identifier (DOI) Crapper, Z. L., Tarique, M., Bernardi, G., Knight, A. C. G., Westfoot, J. A., Crofts, O. T., Taylor, A. C., Bickle, M. J., Turchyn, A. V., Tipper, E. T. (PublicationYear). Multi-season Himalayan spring, stream and rainwater geochemical data set from the Melamchi Valley catchment, Nepal (2022 - 2025). NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/b93b2ce1-7b33-43ef-974e-e2eab40c11f8 information dataset dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false Water samples were collected directly from springs and rivers, and in rain collectors. Samples were filtered through 0.2micron PES membranes, with cation samples acidified to pH 2 while anion samples were left unacidified. HCO3- was determined by gran titration in the field. Cations were determined using an Agilent 5100 and anions using a Dionex ICS-5000. Both have an analytical uncertainty of 5%. Some samples were run for minor cations on an iCap-Q ICP-MS with an uncertainty of 10%. Stable water isotopes were measured on a Picarro L2140-i with uncertainties of 0.1,0.15 and 1.2‰ for δ17O, δ18O and δ2H respectively. δ13C was measured on a MAT253 mass spectrometer with uncertainty 0.2‰. Isotopes and uncertainties measured on a Neptune ICP-MS include 87Sr/86Sr (70ppm), δ88Sr (0.03‰), δ30Si (0.06‰) and δ7Li (1‰) Additional 87Sr/86Sr isotopes were made on a TIMS VG Sector 54 (70ppm).