GREENWORLD SECTOR-7 // METRICS // VC-MET-213
ALL SYSTEMS NOMINAL · —
METRICS · TOXIN & BIOCHEMICAL

Ethylene Emission

VC-MET-213 — canopy ethylene flux — the plant stress and senescence hormone, read continuously by the mesh.

Metric ID VC-MET-213 Category Toxin & Biochemical Unit nL·L⁻¹·h⁻¹ Type Direct Source PhytoSense Mesh Sampling 10 min Owner Metrology & Telemetry Standards Rev C · Effective 2089-06-01
Current 22 Nominal 5–40 10 min cadence PhytoSense Mesh

Definition

Ethylene Emission is the volumetric concentration of ethylene (C₂H₄) in canopy air, in nL·L⁻¹ per hour, measured by electrochemical cells on the PhytoSense Mesh. Ethylene is the principal gaseous stress and ripening hormone.

Why it matters

Rising ethylene is one of the earliest gas-phase markers of canopy stress, wounding, or accelerated senescence. A corridor-wide spike often precedes visible decline and can indicate a containment or climate fault upstream.

Formula

Reported as the zone mean of mesh ethylene cells, baseline-
corrected against the intake reference cell:

E = mean(cell_i) − E_intake     [nL · L⁻¹ · h⁻¹]

Cells auto-zero nightly against scrubbed reference air;
drift > 5 nL·L⁻¹ flags the cell for service.

Inputs

InputDetailSource
Mesh cellsElectrochemical C₂H₄, per nodePhytoSense Mesh
Intake referenceScrubbed-air baselinePhytoSense Mesh
Zone mapNode-to-zone assignmentCHLORA

Units & Scale

nL·L⁻¹·h⁻¹, integer resolution, reported as a zone mean with a 1-hour trend. Increasing-is-worse: only upper thresholds apply.

Sampling & Source

Thresholds

Nominal · 5–40 nL·L⁻¹·h⁻¹ — baseline canopy flux

OK

Warning · > 80 — stress advisory

WARN

Critical · > 150 — canopy stress escalation

CRIT

Localize before acting. A zone-mean spike is triaged to its node cluster before dispatch — a single wounded specimen or a sealing fault can drive a corridor mean without a facility-wide event.

Recent Trend

Zone roll-up, last 14 sampling periods (current 22):

VC-MET-213 · 14-period trend (current 22)

Interpretation Guidance

BandReadingLikely DriverAction
5–40BaselineNormal respirationNone.
41–80ElevatedMild stress or ripeningLocalize node cluster; inspect.
81–150WARNActive stress eventDispatch triage; check climate.
> 150CRITWounding or rapid senescenceAuto-escalate; isolate source.
VC-MET-214

Total VOC Flux

Broader volatile signal.

 VC-MET-011

Senescence Fraction

Lagging confirmation.

 VC-MET-001

Canopy Vitality Index

Aggregate health.

 VC-MET-111

Canopy Airflow Velocity

Dilution context.

Related SOPs