CARVE Modeled Carbon Exchange for Alaska Using Multi-Source Greenness Data

Three-hourly estimates of gross ecosystem CO2 exchange and respiration for Alaska from 2012 to 2014 are provided at approximately 1 km2 pixel resolution. The Polar Vegetation Photosynthesis and Respiration Model generated the data, incorporating meteorological reanalysis and three independent greenness sources from MODIS, OCO-2, and GOME-2 satellites. This dataset offers a high-frequency, multi-sensor view of carbon dynamics in Arctic ecosystems.

Use Cases

• Validating regional carbon cycle models against three independent estimates of Gross Ecosystem Exchange (GEE).
• Analyzing the spatial and temporal patterns of autotrophic and heterotrophic respiration across Alaska's biomes.
• Studying the relationship between satellite-derived greenness indices (EVI, SIF) and ecosystem carbon flux.
• Investigating the impact of meteorological variables and surface conditions (snow cover, LSWI) on Arctic carbon dynamics.

Strengths

• Provides three independent GEE estimates derived from MODIS EVI, OCO-2 SIF, and GOME-2 SIF, enabling method comparison.
• Offers high temporal resolution with 3-hourly data over a 3-year period (2012-2014).
• Utilizes a specialized model (PolarVPRM) designed for high-frequency carbon flux estimation in North American biomes.

Limitations

• Specific row count, file size, and column names are not provided by any source, limiting precise technical assessment.
• Conflicting 'last updated' dates exist between platforms (2014-12-31 and 2026-03-13), creating uncertainty about metadata currency.

Provenance

Source

ORNL_CLOUD, utilizing data from MODIS, OCO-2, GOME-2, and NARR meteorological reanalysis.

Collection Method

Modeled outputs from the Polar Vegetation Photosynthesis and Respiration Model (PolarVPRM).

Time Range

2012 to 2014

Freshness

2026-03-13 05:58:03.320735

Geography

State of Alaska