CLIM-04 / SPM.A / Research primer
What does ocean heat reveal that surface temperature misses?
How do changes in ocean heat storage compare with surface-temperature variation over aligned, sufficiently long observation windows?
NASA/STS-44 crew. Sunlight revealing internal-wave patterns in the western Indian Ocean, photographed from Atlantis in 1991. Contextual image; not used to estimate a trend. Image credits.
The question
Surface temperature and accumulated ocean heat describe different parts of the climate system. The proposed study compares their timing without converting one into the other.
Why it matters
A single surface reading cannot describe the system's stored energy; the distinction matters for interpreting apparent pauses and long-term commitment.
The AR6 anchor
AR6 assesses widespread ocean change and finds that some future changes are unavoidable or irreversible, although sustained mitigation can limit them (high confidence).
AR6 Synthesis Report (2023) / A.2; B.3.
Evidence and comparison
- Unit of analysis
- World-year and explicitly labeled multiyear heat-uptake periods.
- Baseline and denominator
- Retain IGCC heat-content reference and depth coverage exactly as documented; NASA keeps 1951-1980. Compare temporal changes, not numeric levels across unlike units.
- First descriptive test
- Present ocean heat storage and surface-temperature change in aligned panels, comparing common ten- and twenty-year windows rather than synchronizing arbitrary vertical scales.
- Deeper analysis
- Separate changes in measured ocean layers from extrapolated deep-ocean contributions; inspect sensitivity to the satellite-era window and source revisions before discussing acceleration.
- Attribution status
- descriptive observation
- Uncertainty
- Preserve published energy-imbalance intervals. IGCC uses ocean heat uptake as a proxy for total-system uptake in recent years; label that methodological boundary.
Principal sources
- Indicators of Global Climate Change
Ocean heat-content change; Earth energy imbalance and assessed ranges.
Target 1971-2025 ocean series and published period summaries; export checks pending. Candidate source; import and publication checks are still required. - NASA GISTEMP v4
Annual global land-ocean temperature anomaly (degC).
Target 1971-2025 complete years; NASA release verification pending. Candidate source; import and publication checks are still required.
Alternative explanations
- Ocean heat redistribution
- Changing sampling coverage
- Deep-ocean extrapolation
The visual argument
Provisional: aligned heat and temperature panels with a shared time-window selector; annotate depth coverage and the transition between measured inventory components and extrapolation.
- Published heat-uptake interval plot
- Depth-layer contribution comparison
- Observation-coverage timeline
- Exact period-summary table
What these data do not show
- Global ocean heat cannot locate a particular marine ecosystem's exposure.
- Shared inputs and sampling errors prevent treating every series as independent evidence.
Reproducibility and next release
Plan src/build.mjs to create data/processed/heat-inventory.csv from versioned data/raw tables; test period alignment, energy units and depth accounting, with source hashes and licensing decisions in provenance.
- After approval: ocean-heat web study
- Article and inventory methods
- Responsive figures and exact values
- 16:9 hero and launch copy
- Optional PDF carousel
- Chart exports and compact CSV