- "DOISST v2.0 and v2.1 have a resolution of daily and 0.25° × 0.25°"
- "The large-scale biases of AVHRR SSTs are corrected against the available in situ observations from ships and buoys in DOISST v2.0 (Reynolds et al. 2007) and from ships, buoys, and Argo floats in this study (v2.1; Table 1). Daily biases of AVHRR SSTs (e.g., 15 January 2020) are calculated in the following procedures: 1) daily AVHRR and in situ SSTs are bin-averaged separately to 2° × 2° grids; 2) daily AVHRR and in situ SSTs are averaged separately within a 15-day running window (e.g., 8–22 January 2020); 3) the averaged AVHRR and in situ SSTs are projected onto a common set of empirical orthogonal teleconnection (EOT) functions; 4) the difference between EOT-filtered AVHRR and in situ SSTs is defined as AVHRR biases; and 5) the daily biases on 2° × 2° grids are interpolated linearly to 0.25° × 0.25° grids and applied to AVHRR SST [see more details in Reynolds et al. (2007); Huang et al. 2015b]."
I'll trust in your competence to answer your remaining questions without my assistance.
From the NOAA link above:
See Huang et al. 2021 for complete details
Huang et al, "Improvements of the Daily Optimum Interpolation Sea Surface Temperature (DOISST) Version 2.1 " (April 2021): <https://journals.ametsoc.org/view/journals/clim/34/8/JCLI-D-...>
Notably:
- "DOISST v2.0 and v2.1 have a resolution of daily and 0.25° × 0.25°"
- "The large-scale biases of AVHRR SSTs are corrected against the available in situ observations from ships and buoys in DOISST v2.0 (Reynolds et al. 2007) and from ships, buoys, and Argo floats in this study (v2.1; Table 1). Daily biases of AVHRR SSTs (e.g., 15 January 2020) are calculated in the following procedures: 1) daily AVHRR and in situ SSTs are bin-averaged separately to 2° × 2° grids; 2) daily AVHRR and in situ SSTs are averaged separately within a 15-day running window (e.g., 8–22 January 2020); 3) the averaged AVHRR and in situ SSTs are projected onto a common set of empirical orthogonal teleconnection (EOT) functions; 4) the difference between EOT-filtered AVHRR and in situ SSTs is defined as AVHRR biases; and 5) the daily biases on 2° × 2° grids are interpolated linearly to 0.25° × 0.25° grids and applied to AVHRR SST [see more details in Reynolds et al. (2007); Huang et al. 2015b]."
I'll trust in your competence to answer your remaining questions without my assistance.