Terra MODIS Level-2 Regional 4µm Day/Night Sea Surface Temperature (SST4) Data, version R2019.0

SST4 provides sea surface temperature retrieved from the mid-wave IR bands near 4 µm (∼3.7–4.1 µm). These channels are typically used at night (to avoid solar contamination) and can offer reduced sensitivity to atmospheric water vapor compared with long-wave (11/12 µm) split-window SST, making SST4 a valuable complement in humid or tropical conditions. Geophysical variables in this suite include: - bias_sst4 — 4 µm Sea Surface Temperature bias (°C) - flags_sst4 — Product-specific flags, 4 µm Sea Surface Temperature (integer bitmask) - l2_flags — Level-2 Processing Flags (integer bitmask; see bit definitions) - qual_sst4 — Quality levels for 4 µm Sea Surface Temperature (integer quality flag) - sst4 — 4 µm Sea Surface Temperature (°C) - sstref — Sea Surface Temperature reference (°C) - stdv_sst4 — 4 µm Sea Surface Temperature standard deviatio (°C