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Data from: Divergence of Arctic shrub growth associated with sea ice decline

Citation

Buchwal, Agata et al. (2020), Data from: Divergence of Arctic shrub growth associated with sea ice decline, Dryad, Dataset, https://doi.org/10.5061/dryad.kh1893248

Abstract

Arctic sea ice extent (SIE) is declining at an accelerating rate with a wide range of ecological consequences. However, determining sea ice effects on tundra vegetation remains a challenge. In this study, we examined the universality or lack thereof in tundra shrub growth responses to changes in SIE and summer climate across the Pan-Arctic, taking advantage of 23 tundra shrub-ring chronologies from 19 widely distributed sites (56⁰-83⁰N).

Methods

We acquired both published and unpublished deciduous shrub-ring chronologies that were distributed throughout the Arctic region and covered, if possible, the entire 40 year-long period of passive microwave satellite-based estimates of arctic sea ice extent (SIE) (1979-present). In order to perform a comparable study at the biome level, our synthesis focused on two shrub genera of commonly studied and widespread deciduous shrubs: Betula and Salix. Shrub-ring data were included in our analyses if the corresponding chronologies i) covered the common period (1979-2008) and ii) had an EPS (a theoretical indicator of how well the chronology represents the population mean) greater than 0.75. Our final dataset consisted of 23 chronologies (9 Betula spp. chronologies and 14 Salix spp. chronologies), 641 shrubs (306 Betula shrubs and 335 Salix shrubs), and 753 cross-sections.

This dataset consists of 23 RWL files for 23 shrub ring chronologies. Each RWL file (Tucson format, unit = mm, resolution 0.001) contains raw data for all individual shrub growth series used to established each site chronology. Raw data are averaged at the plant level for the shrubs that were subjected to serial sectioning or when more than one cross-section was sampled per individual shrub. These are raw individual shrub data, not detrended or standardized.

Usage Notes

ReadMe_v01: File description for manuscript Buchwal et al. 2020: Divergence of Arctic shrub growth associated with sea ice decline. https://www.pnas.org/content/early/2020/12/09/2013311117

Version_01

Date: November 22, 2020

Contact person: Agata Buchwal, Adam Mickiewicz University Poznan, Poland, ORCID ID: 0000-0001-6879-6656; kamzik@amu.edu.pl

This repository consist of:

#1: Table 1: Metadata file for 23 shrub ring chronologies used in the Buchwal et al. (2020) synthesis

#2: 23 RWL files for 23 shrub ring chronologies.

Each RWL file (Tucson format, unit = mm, resolution 0.001) contains raw data for all individual shrub growth series used to established each site chronology. Raw data are averaged at the plant level for the shrubs that were subjected to serial sectioning or when more than one cross-section was sampled per individual shrub. These data are not detrended or standardized. If You need shrub ring data at the cross-sectional level, please contact a relevant data contributor/-s (Table 1, column Q). In order to open RWL files (.rwl) you can use ‘read.rwl’ function in dplR package (Bunn 2008) in R (R Core Team).

List of RWL files attached: AF_SAR.rwl BL_BGL.rwl BS_BGL.rwl BT_BGL.rwl DE_SGL.rwl DK_BNA.rwl EB_SPO.rwl GR_BGL.rwl HE_SAR.rwl HE_SRI.rwl KG_BNA.rwl KG_SGL.rwl KY_BNA.rwl KY_SPU.rwl LA_SAR.rwl LB_SRI.rwl PL_SAR.rwl RE_SAR.rwl TL_BNA.rwl UM_BGL.rwl VA_SRI.rwl YR_SRI.rwl ZA_SAR.rwl

References: A. G. Bunn, A dendrochronology program library in R (dplR). Dendrochronologia 26, 115-124 (2008). R Core Team R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria.URL https://www.R-project.org/ (2018).

Funding

Fulbright Commission (Polish-U.S)

Polish Ministry of Science and Higher Education, Award: 1072/MOB/2013/0; N306 009139

EU-F7P INTERACT, Award: 262693

Scientific Exchange Program Sciex, Award: 09.045

National Science Foundation, Award: 1504141; OPP-1108425; OPP-0902125; OPP-1107381; OPP-1525636; OPP-1418123

Arctic Observing Network

Natural Environment Research Council, Award: IRF NE/L011859/1; NE/M016323/1

Canada 150 Research Chairs Program

Natural Sciences and Engineering Research Council of Canada

Canadian Centennial Scholarship Fund

Academy of Finland, Award: 256991

JPI Climate, Award: 291581

ArcticNet

Polar Continental Shelf Program

Fonds de recherche du Québec – Nature et technologies

Danmarks Grundforskningsfond, Award: CENPERM DNRF100

Northern Scientific Training Program

UArctic Research Chairship

European Commission Research and Innovation Action, Award: 869471

Fulbright Commission (Polish-U.S)

Polish Ministry of Science and Higher Education, Award: 1072/MOB/2013/0; N306 009139

EU-F7P INTERACT, Award: 262693

Scientific Exchange Program Sciex, Award: 9.045

Arctic Observing Network

Canada 150 Research Chairs Program

Canadian Centennial Scholarship Fund

JPI Climate, Award: 291581

Polar Continental Shelf Program

Northern Scientific Training Program

UArctic Research Chairship