GMI instrument data provides global subskin sea surface temperature measurements. The dataset includes near-real-time products with a 3 to 6-hour delay, available as daily, 3-day, weekly, and monthly time series. It is produced by the GHRSSTCWIC organization using data from the NASA-JAXA GPM satellite launched in 2014.
Use Cases
- Analyze sea surface temperature anomalies and trends using the global daily time series.
- Validate ocean circulation models by comparing simulated SST with the satellite-derived subskin temperature field.
- Study diurnal warming cycles by leveraging the satellite's full sampling of all local Earth times repeated every ~2 weeks.
- Assess precipitation patterns by correlating SST data from GMI with other GPM mission precipitation products.
- Monitor near-real-time ocean thermal conditions for operational forecasting using the 3 to 6-hour latency NRT data.
Strengths
- Data is available in near-real-time with a latency of about 3 to 6 hours.
- Global spatial coverage is achieved via a satellite orbit inclined 65 degrees, sampling all local Earth times.
- Includes multiple aggregated time series products: Daily, 3-Day, Weekly, and Monthly.
Limitations
- Specific row count, file size, and spatial resolution are unknown from the provided description.
- Data is derived from passive microwave radiometry, which has lower spatial resolution compared to infrared sensors.
- The dataset is versioned (V8), and differences from previous versions (e.g., V7 brightness temperatures) may affect time series consistency.
Provenance
- Source
- GHRSSTCWIC organization, using data from the GMI instrument on the NASA-JAXA GPM satellite.
- Collection Method
- Passive microwave radiometer measurements processed by Remote Sensing Systems (REMSS) using an updated RTM, Version-8.
- Time Range
- From the GPM satellite launch date (February 27, 2014) onward.
- Freshness
- Near-real-time update frequency (3-6 hour delay).
- Geography
- Global coverage.