Antarctic Fast Ice Algal Photosynthesis Measurements

Oxygen microelectrode measurements detail the photosynthetic rates of Antarctic fast ice algal mats near Davis station. The dataset includes productivity metrics, photosynthetic capacity (P_max), and key irradiance parameters like saturation onset (E_k) and compensation point (E_c). Data was collected by the Australian Antarctic Data Centre and last updated in December 1995.

Use Cases

• Modeling carbon fixation rates in sea-ice ecosystems using the measured productivity range of 0-1.78 mg C per m² per hour.
• Analyzing the light response of algal mats by relating irradiance levels to photosynthetic parameters like P_max, E_k, E_inh, and E_c.
• Comparing productivity estimation methods by evaluating microelectrode-derived rates against conventional carbon-14 techniques.
• Studying photoinhibition thresholds in polar algae using the measured irradiance for inhibition onset (E_inh ~20 μmol photons m⁻² s⁻¹).

Strengths

• Includes specific physiological parameters: P_max (~0.05 mg C mg Chl a⁻¹ hr⁻¹), E_k (~14 μmol photons m⁻² s⁻¹), E_c (4 μmol photons m⁻² s⁻¹).
• Reports a concrete productivity range (0 to 1.78 mg C m⁻² hr⁻¹) for Antarctic fast ice.
• Data originates from a recognized polar research organization (Australian Antarctic Data Centre).

Limitations

• Sample size and number of measurement locations are unknown.
• Data is temporally stale, with last update in 1995, limiting analysis of recent ecological changes.
• Geographic scope is limited to fast ice near Davis station, Antarctica.

Provenance

Source

Australian Antarctic Data Centre (AU_AADC) via NASA Earthdata.

Collection Method

Field measurements using oxygen microelectrodes on algal mats under fast ice.

Time Range

Specific measurement dates unknown; dataset last updated 1995-12-02.

Geography

Antarctic fast ice at Davis station.