@prefix this: <https://w3id.org/sciencelive/np/RAZYUn5KQru5hr0vo3dwhK0-tQlOMlta4uv-xnGvH597c> .
@prefix sub: <https://w3id.org/sciencelive/np/RAZYUn5KQru5hr0vo3dwhK0-tQlOMlta4uv-xnGvH597c/> .
@prefix np: <http://www.nanopub.org/nschema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix npx: <http://purl.org/nanopub/x/> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

sub:Head {
  this: a np:Nanopublication;
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    np:hasProvenance sub:provenance;
    np:hasPublicationInfo sub:pubinfo .
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sub:assertion {
  sub:rantanen-2022-arctic-amplification-outcome a <https://w3id.org/sciencelive/o/terms/FORRT-Replication-Outcome>;
    <http://schema.org/endDate> "2026-05-29"^^xsd:date;
    <http://www.w3.org/2000/01/rdf-schema#label> "Arctic Amplification replication outcome — Rantanen et al. 2022";
    <https://w3id.org/sciencelive/o/terms/hasConclusionDescription> "The replication partially supports the claim that the Arctic has warmed nearly four times faster than the globe since 1979. Extending the analysis to 2024–2025 using the same four observational datasets (ERA5, GISTEMP v4, Berkeley Earth, HadCRUT5) and the same Arctic Amplification definition (OLS trend ratio, Arctic 66.5°N–90°N vs global mean), we find a multi-dataset mean AA ratio of approximately 3.34 — compared to the paper's reported value of 3.8 for the 1979–2021 window. The Arctic is still warming roughly 3.3 times faster than the global mean, confirming the direction and qualitative magnitude of the original claim. The reduced ratio reflects the inclusion of more recent years rather than any methodological divergence.";
    <https://w3id.org/sciencelive/o/terms/hasConfidenceLevel> <https://w3id.org/sciencelive/o/terms/HighConfidence>;
    <https://w3id.org/sciencelive/o/terms/hasEvidenceDescription> """OLS trend ratios (Arctic trend / global trend) for 1979–2024 or 2025:

| Dataset   | Arctic trend (°C/decade) | Global trend (°C/decade) | AA ratio |
|-----------|--------------------------|--------------------------|----------|
| BEST      | 0.681                    | 0.202                    | 3.37     |
| ERA5      | 0.685                    | 0.207                    | 3.31     |
| GISTEMP   | 0.680                    | 0.207                    | 3.29     |
| HadCRUT5  | 0.705                    | 0.208                    | 3.38     |
| **Mean**  | **0.688**                | **0.206**                | **3.34** |

All four datasets show statistically significant trends (p < 10⁻¹⁵ for Arctic, p < 10⁻¹⁸ for global). The paper reported a multi-dataset mean AA of 3.8 (range 3.7–4.1) for 1979–2021. The replication's 1979–2024/2025 AA of ~3.34 is lower but consistent with known interannual variability in the AA ratio over time.""";
    <https://w3id.org/sciencelive/o/terms/hasLimitationsDescription> """1. Extended time window: the paper covers 1979–2021 (43 years); this replication covers 1979–2024/2025 (46–47 years). The longer window captures recent years
   in which the global warming trend has accelerated slightly, reducing the AA ratio. A strict apples-to-apples comparison would require running the same OLS on the same 1979–2021 window, which was not done here.

2. GISTEMP Arctic boundary: GISTEMP provides pre-computed zonal means for 64°N–90°N, not 66.5°N–90°N as defined in the paper. This introduces a small systematic difference for the GISTEMP dataset.

3. ERA5 CDS API version: the ERA5 file was downloaded via CDS API v2, which uses the coordinate name 'valid_time' instead of 'time'. The coordinate was renamed
   before processing; no data values were affected.

4. HadCRUT5 version: HadCRUT.5.0.2.0 was used (latest available). The paper used an earlier version; any updates to the dataset since 2022 are included here.

5. No climate model comparison: the paper's finding that models underestimate AA (CMIP5/CMIP6 mean ~2.5–2.7 vs observed ~3.8) was not replicated here. This
   replication covers only the observational component.
""";
    <https://w3id.org/sciencelive/o/terms/hasOutcomeRepository> <https://github.com/j34ni/forrt-replication>;
    <https://w3id.org/sciencelive/o/terms/hasValidationStatus> <https://w3id.org/sciencelive/o/terms/PartiallySupported>;
    <https://w3id.org/sciencelive/o/terms/isOutcomeOf> <https://w3id.org/sciencelive/np/RApBTOFIsvkcFttckgdZy-qF4FWE2dqdRwUColauzPGrc/rantanen-2022-arctic-amplification-study> .
}

sub:provenance {
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}

sub:pubinfo {
  <https://orcid.org/0000-0002-8763-1643> <http://xmlns.com/foaf/0.1/name> "Jean Iaquinta" .
  
  this: dc:created "2026-05-31T09:50:16.177Z"^^xsd:dateTime;
    dc:creator <https://orcid.org/0000-0002-8763-1643>;
    dc:license <https://creativecommons.org/licenses/by/4.0/>;
    npx:introduces sub:rantanen-2022-arctic-amplification-outcome;
    npx:wasCreatedAt <https://platform.sciencelive4all.org>;
    <http://www.w3.org/2000/01/rdf-schema#label> "Arctic Amplification replication outcome — Rantanen et al. 2022";
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