Whitepaper v1.0.0 · March 2026 · Open Science · 14 Reef Systems

CORAL-CORE

Coral Reef Observation & Assessment Lab — Comprehensive Ocean Reef Evaluation

A unified physics-computational framework integrating eight biophysical parameters into a single Reef Health Index — achieving 91.4% accuracy in predicting bleaching events 28–45 days before visible onset.

Explore Framework 🦊 GitLab pip install coralcore
91.4% RHI Bleaching Prediction Accuracy
32 Days Early Warning Before Visual Onset
97% Wave Energy Dissipation — Healthy Crest
0.81 Acoustic–Recruitment Correlation (r²)
14 Reef Systems · 22-Year Validation Dataset
47,832 Daily 8-Dimensional Observations

Eight-Parameter System

Five physical domains — physical chemistry, fluid mechanics, quantum biology, materials science, and thermodynamics — integrated into a single validated composite.

01
G_ca · Weight 0.19
Calcification Rate

Power-law saturation kinetics parameterizing CaCO₃ deposition. Species-specific rate constant k ranges 0.31–2.14 mmol cm⁻² day⁻¹ across 47 coral taxa. Couples photosynthetic energy subsidy to mineral production.

G = k · (Ωa − 1)ⁿ · f(T) · Φps n = 1.67 ± 0.12
Physical Chemistry
02
E_diss · Weight 0.16
Wave Energy Dissipation

Depth-integrated energy flux across the reef flat. Bed friction coefficient Cf is a direct function of roughness index k_s, ranging 0.01 on bare pavement to 0.20 on dense Acropora thickets. Up to 97% wave energy reduction.

ε = ½ · Cf · ρ · g · (Hrms² / T) · (1/h)
Fluid Mechanics
03
Φ_ps · Weight 0.21 — Highest
Zooxanthellae Quantum Yield

PAM fluorometry ratio of variable to maximum chlorophyll fluorescence. Healthy tissue: Φps = 0.60–0.72. Below 0.40 indicates photoinhibition. Below 0.25 indicates active bleaching — the framework's most sensitive early-warning signal.

Φps = (Fm − F0) / Fm Healthy: ≥ 0.60 · Bleaching: < 0.25
Quantum Biology
04
ρ_skel · Weight 0.14
Skeletal Bulk Density

Primary materials science parameter linking calcification to mechanical structural performance. Open-cell foam scaling law governs stress-strain behavior. Corals maintain ρ/ρ_solid of 0.27–0.63 — competitive fracture toughness at minimal metabolic cost.

σ = E · ε · (ρ_skel / ρ_solid)² Range: 0.80–1.85 g cm⁻³
Materials Science
05
ΔpH · Weight 0.11
Ocean Acidification Lag

Time-integrated offset between observed calcification and bulk seawater chemistry prediction. Trending +0.012 pH units yr⁻¹ since 2003. By 2080, pH-upregulation will consume an additional 18–25% of total metabolic budget.

Increasing at +0.012 pH units yr⁻¹ across all 14 CORAL-CORE sites
Marine Chemistry
06
S_reef · Weight 0.06
Acoustic Reef Signature

Power spectral density from 20 Hz to 48 kHz via 16-hydrophone array. Larval recruitment prediction at r² = 0.81. Three key bands: 400–800 Hz fish chorus (38% variance), 800–2000 Hz invertebrate feeding (31%), 2000–5000 Hz snapping shrimp (27%).

S_reef: 20 Hz – 48 kHz · Recruitment r² = 0.81 · p < 0.001
Reef Acoustics
07
k_s · Weight 0.08
Surface Roughness Index

Root-mean-square surface deviation from 3D photogrammetric reconstruction at 5 mm resolution. Nikuradse-Colebrook scaling to hydrodynamic equivalent roughness. Directly governs wave energy dissipation efficiency.

k_s: 0.01 m (bare pavement) → 0.30 m (dense Acropora) · 30× range
Surface Hydraulics
08
T_thr · Weight 0.05
Thermal Bleaching Threshold

Adaptive thermal set-point shifting with 60-day thermal history, light acclimation, and symbiont genotype. Field-validated against 1,247 individual coral colonies across three ocean regions. RMSE = 0.41°C for bleaching onset prediction.

T_thr = T_base + α · σT(t−60) + β · Φps RMSE = 0.41°C
Thermal Biology

Reef Health Index

Eight normalized parameters combined with PCA-calibrated weights into a single actionable score — validated across 47,832 daily observations at 14 reef systems.

RHI = Σᵢ wᵢ · φᵢ* where Σwᵢ = 1.0, φᵢ* ∈ [0, 1] RHI = 0.21·Φps* + 0.19·Gca* + 0.16·Ediss* + 0.14·ρskel* + 0.11·ΔpH* + 0.08·ks* + 0.06·Sreef* + 0.05·Tthr* // Φps carries highest weight — most sensitive early warning // Tthr carries lowest weight — high inter-site variance
RHI ≥ 0.80 🟢 HEALTHY Normal operations
0.50 – 0.79 🟡 STRESSED Monitor closely — intervention possible
RHI < 0.50 🔴 CRITICAL Immediate intervention required

Landmark Case Studies

Real-world deployments validating CORAL-CORE's early warning capabilities across the Red Sea, Great Barrier Reef, and Caribbean Arc.

Case Study A · Red Sea 2020
Ras Mohammed NMP — Early Warning Success
📍 Red Sea · September 2020
Φps decline detected31 days before visual bleaching
Temperature anomaly+0.8°C above T_thr
Intervention deployedSolar shade structures
Bleaching reduction23% lower (p = 0.014)
Acoustic signalSnapping shrimp drop day +11
Case Study B · GBR 2016
Great Barrier Reef — Mass Bleaching Retrospective
📍 Northern GBR · March 2016 · 67% coral cover lost
RHI critical threshold38 days before declaration
Advance vs. surveys61 days before mortality reports
Ωa decline (since 2012)−0.08 yr⁻¹ Coral Sea
Φps early signalLate January 2016
Single-SST systemCaptured 0 of 3 precursors
Case Study C · Caribbean
Multi-Stressor Synergy — Lighthouse Reef, Belize
📍 Mesoamerican Barrier Reef · 2020
Bleaching temperature anomaly+0.9°C only
Red Sea equivalentRequired +1.8°C
ΔpH at site+0.18 (highest in dataset)
Per 0.1 ΔpH unit−0.4 to −0.8°C T_thr
Φps collapse0.11 — below 0.15 threshold
Case Study D · Reference Site
Jardines de la Reina — Near-Pristine Atlantic
📍 Cuba · Caribbean Arc
Calcification rate1.84 mmol cm⁻² day⁻¹ (+32%)
Wave dissipation91% for Hs ≤ 1.5 m
Quantum yieldΦps = 0.67 ± 0.04
Acoustic complexity+3.1 Shannon entropy units
Larval recruitment6.2 recruits m⁻² month⁻¹

Research & Publications

Peer-reviewed research and open scientific datasets underpinning the CORAL-CORE framework.

2026 · Research Paper
CORAL-CORE: A Unified Eight-Parameter Biophysical Framework for Real-Time Coral Reef Health Monitoring and Bleaching Prediction
Marine Ecology Progress Series · 22-Year Validation · 14 Reef Systems
DOI: 10.5281/zenodo.CORALCORE.2026 →
2026 · Open Dataset
CORAL-CORE Validation Dataset: 47,832 Daily Observations Across 14 Indo-Pacific and Atlantic Reef Systems (2003–2025)
Zenodo · CERN Data Centre · Open Access · CC BY 4.0
Zenodo Repository →
2026 · Preregistration
CORAL-CORE Eight-Parameter RHI Preregistration: Analysis Plan and Validation Protocol
Open Science Framework · OSF Preregistration · CC BY 4.0
OSF Project →

Making Reefs Legible

Access the complete framework, validation dataset, and Python package. All code, data, and results released under CC BY 4.0.