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      Data on DOC and N from the Muz taw glacier in Central Asia

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          Abstract

          This Data in Brief article provides a supplementary information to the dissolved organic carbon and nitrogen from the snow of Muz taw glacier in the Central Asia, which is related to the scientific article titled with “Characterization, sources and transport of dissolved organic carbon and nitrogen from a glacier in the Central Asia”[1]. Meanwhile, major ions (including Na +, K +, NH 4 +, Ca 2+, Mg 2+, Cl , SO 4 2−, NO 3 , and NO 2 ) were also reported. These data were analysed using descriptive statistics such as correlations and principle component analysis. Additionally, we conducted a literature review on DOC and N concentrations for the comparison. This article also presents the analysis data of the mass absorption cross section of DOC in snow.

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          Sources and light absorption of water-soluble organic carbon aerosols in the outflow from northern China

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            Sources, cycling and export of nitrogen on the Greenland Ice Sheet

            Fjord and continental shelf environments in the polar regions are host to some of the planet's most productive ecosystems and support economically important fisheries. Their productivity, however, is often critically dependent upon nutrient supply from upstream terrestrial environments delivered via river systems. In glacially fed coastal ecosystems, riverine nutrients are largely sourced from melting snow and ice. The largest and most extensive glacially fed coastal ecosystem in the Arctic is that bordering the Greenland Ice Sheet. The future primary productivity of this ecosystem, however, is uncertain. A potential increase in primary productivity driven by reduced sea ice extent and associated increased light levels may be curtailed by insufficient nutrient supply, and specifically nitrogen. Research on small valley glaciers indicates that glaciers are important sources of nitrogen to downstream environments. However, no data exist from ice sheet systems such as Greenland. Time series of nitrogen concentrations in runoff are documented from a large Greenland glacier, demonstrating seasonally elevated fluxes to the ocean. Fluxes are highest in mid-summer, when nitrogen limitation is commonly reported in coastal waters. It is estimated that approximately half of the glacially exported nitrogen is sourced from microbial activity within glacial sediments at the surface and bed of the ice sheet, doubling nitrogen fluxes in runoff. Summer dissolved inorganic nitrogen fluxes from the Greenland Ice Sheet (30–40 Gg) are a similar order of magnitude to those from a large Arctic river (Holmes et al., 2012). Nitrogen yields from the ice sheet (236 kg TDN km −2  a −1 ), however, are approximately double those from Arctic riverine catchments. We assert that this ice sheet nitrogen subsidy to Arctic coastal ecosystems may be important for understanding coastal biodiversity, productivity and fisheries and should be considered in future biogeochemical modelling studies of coastal marine productivity in the Arctic regions.
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              Source-diagnostic dual-isotope composition and optical properties of water-soluble organic carbon and elemental carbon in the South Asian outflow intercepted over the Indian Ocean: SOURCE OPTICAL PROPERTIES EC WSOC S ASIA

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                Author and article information

                Contributors
                Journal
                Data Brief
                Data Brief
                Data in Brief
                Elsevier
                2352-3409
                18 April 2020
                June 2020
                18 April 2020
                : 30
                : 105556
                Affiliations
                [a ]Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
                [b ]State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
                [c ]CAS Centre for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China
                [d ]Institute for Atmospheric and Climate Science, ETH Zurich, CH-8092 Zurich, Switzerland
                Author notes
                [* ]Corresponding author at: State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China. yulan.zhang@ 123456lzb.ac.cn
                Article
                S2352-3409(20)30450-9 105556
                10.1016/j.dib.2020.105556
                7200776
                1234bfa3-c01e-4e41-9504-e04fcacf4719
                © 2020 The Authors

                This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

                History
                : 31 March 2020
                : 3 April 2020
                : 3 April 2020
                Categories
                Earth and Planetary Science

                dissolved organic carbon,total dissolved nitrogen,glacier melt,radiative forcing,central asia

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