Hydroclimatic controls on the isotopic (δ¹⁸ O, δ² H, d-excess) traits of pan-Arctic summer rainfall events |
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Author: | Mellat, Moein1,2; Bailey, Hannah1; Mustonen, Kaisa-Riikka1; |
Organizations: |
1Ecology and Genetics Research Unit, University of Oulu, Oulu, Finland 2Water, Energy, and Environmental Engineering Research Unit, University of Oulu, Oulu, Finland 3Department of Geological Sciences, University of Alaska Anchorage, Anchorage, AK, United States
4Institute of Natural Sciences, Ural Federal University, Yekaterinburg, Russia
5Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, United States 6N. Laverov Federal Center for Integrated Arctic Research, UrB Russian Academy of Science, Arkhangelsk, Russia 7Norwegian Polar Institute, Fram Centre, Norway/Ny-Ålesund Research Station, Tromsø, Norway 8Department of Geography, University of Calgary, Calgary, AB, Canada 9Environmental Dinamic and Global Climate Change Research Center, Yugra State University, UNESCO Chair of Environmental Dynamic and Global Climate Changes, Khanty-Mansiysk, Russia 10The Finnish Forest Administration, Metsähallitus, Muonio, Finland 11BIO-GEO-CLIM Laboratory, Tomsk State University, Tomks, Russia 12Tuvan State University, Kyzyl, Russia 13Arctic Station, Greenland, University of Copenhagen, Copenhagen, Denmark 14Department of Environment and Mineral Resources, Greenland Institute of Natural Resources, Nuuk, Greenland 15Oulanka Research Station, University of Oulu, Oulu, Finland 16Géosciences Environnement Toulouse, Université de Toulouse, CNRS, Toulouse, France 17Faculty of Biology, Siberian Federal University, Krasnoyarsk, Russia 18V.N Sukachev Institute of Forest SB RAS, Krasnoyarsk, Akademgorodok, Russia 19Kevo Subarctic Research Institute, Biodiversity Unit, University of Turku, Turku, Finland 20Sudurnes Science and Learning Center, Sandgerdi, Iceland 21Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK, United States 22University of the Arctic-UArctic, Rovaniemi, Finland |
Format: | article |
Version: | published version |
Access: | open |
Online Access: | PDF Full Text (PDF, 3.5 MB) |
Persistent link: | http://urn.fi/urn:nbn:fi-fe2021092246904 |
Language: | English |
Published: |
Frontiers Media,
2021
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Publish Date: | 2021-09-22 |
Description: |
AbstractArctic sea-ice loss is emblematic of an amplified Arctic water cycle and has critical feedback implications for global climate. Stable isotopes (δ¹⁸O, δ²H, d-excess) are valuable tracers for constraining water cycle and climate processes through space and time. Yet, the paucity of well-resolved Arctic isotope data preclude an empirically derived understanding of the hydrologic changes occurring today, in the deep (geologic) past, and in the future. To address this knowledge gap, the Pan-Arctic Precipitation Isotope Network (PAPIN) was established in 2018 to coordinate precipitation sampling at 19 stations across key tundra, subarctic, maritime, and continental climate zones. Here, we present a first assessment of rainfall samples collected in summer 2018 (n = 281) and combine new isotope and meteorological data with sea ice observations, reanalysis data, and model simulations. Data collectively establish a summer Arctic Meteoric Water Line where δ²H = 7.6⋅δ¹⁸O–1.8 (r² = 0.96, p < 0.01). Mean amount-weighted δ¹⁸O, δ²H, and d-excess values were −12.3, −93.5, and 4.9‰, respectively, with the lowest summer mean δ¹⁸O value observed in northwest Greenland (−19.9‰) and the highest in Iceland (−7.3‰). Southern Alaska recorded the lowest mean d-excess (−8.2%) and northern Russia the highest (9.9‰). We identify a range of δ¹⁸O-temperature coefficients from 0.31‰/°C (Alaska) to 0.93‰/°C (Russia). The steepest regression slopes (>0.75‰/°C) were observed at continental sites, while statistically significant temperature relations were generally absent at coastal stations. Model outputs indicate that 68% of the summer precipitating air masses were transported into the Arctic from mid-latitudes and were characterized by relatively high δ¹⁸O values. Yet 32% of precipitation events, characterized by lower δ¹⁸O and high d-excess values, derived from northerly air masses transported from the Arctic Ocean and/or its marginal seas, highlighting key emergent oceanic moisture sources as sea ice cover declines. Resolving these processes across broader spatial-temporal scales is an ongoing research priority, and will be key to quantifying the past, present, and future feedbacks of an amplified Arctic water cycle on the global climate system. see all
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Series: |
Frontiers in earth science |
ISSN: | 2296-6463 |
ISSN-E: | 2296-6463 |
ISSN-L: | 2296-6463 |
Volume: | 9 |
Article number: | 651731 |
DOI: | 10.3389/feart.2021.651731 |
OADOI: | https://oadoi.org/10.3389/feart.2021.651731 |
Type of Publication: |
A1 Journal article – refereed |
Field of Science: |
1172 Environmental sciences |
Subjects: | |
Funding: |
The Pan-Arctic Precipitation Isotope Network (PAPIN) received funding from the European Union’s Horizon 2020 Project INTERACT, under Grant Agreement No.730938 (JW PI). An Academy of Finland Grant (316014-JW PI). Support was also provided by a University of the Arctic Research Chairship to JW that funded isotope analyses and provided postdoctoral support for HB and K-RM and postgraduate research support for MM. A Russian Science Foundation Grant (No. 18-11-00024) to KG funded isotope analyses. SK was thankful to Russian Science Foundation (No. 20-67-46018). Russian Foundation for Basic Research (BFBR) supported isotopic analyses conducted by AP (#18-05-60203-Arktika). |
EU Grant Number: |
(730938) INTERACT - International Network for Terrestrial Research and Monitoring in the Arctic |
Academy of Finland Grant Number: |
316014 |
Detailed Information: |
316014 (Academy of Finland Funding decision) |
Copyright information: |
© 2021 Mellat, Bailey, Mustonen, Marttila, Klein, Gribanov, Bret-Harte, Chupakov, Divine, Else, Filippov, Hyöky, Jones, Kirpotin, Kroon, Markussen, Nielsen, Olsen, Paavola, Pokrovsky, Prokushkin, Rasch, Raundrup, Suominen, Syvänperä, Vignisson, Zarov and Welker. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
https://creativecommons.org/licenses/by/4.0/ |