(Version 2.1, experimental, released September 13, 2019)
Home | Stress Frequency | Stress Onset | SST Variability | SST Trend | Climatology | Annual History
Stress Frequency (255Mb) | Stress Onset (411Mb) | SST Variability (255Mb) | SST Trend (137Mb)
Climatology (607Mb) | Annual History (6.7Gb)
Climatology metrics: A climatology, by definition, is the long-term condition representing the expected temperature value or variation for a site. The climatology posted on this web page has a reference time period of 1985-1990 plus 1993 only (see below for more details). In addition to data and images of the Monthly Climatology of sea surface temperature (SST), metrics herein identify which of the 12 months is the climatologically warmest and coolest, as well as the typical range of SST experienced at coral reef-containing and adjacent satellite pixel locations worldwide.
The climatology presented in the Version 2.1 Thermal History product suite was derived from Coral Reef Watch's (CRW) Version 3.1 'CoralTemp' daily global 5km satellite SST data product (which extends from 1985-2012). Use of the 'CoralTemp' SST dataset to derive this climatology follows the established methodology for CRW’s Version 3.0 (and later) daily global 5km satellite coral bleaching heat stress products.
To create the climatology for the Version 2.1 Thermal History product suite, we performed the following steps:
1) We calculated the average temperature for each individual month between 1985 and 2012 for each individual satellite pixel.
2) Next, for each calendar month, we computed an initial 28-year monthly mean climatology, along with the linear regression of the monthly average temperatures over the 28-year period (1985-2012) of the 'CoralTemp' SST dataset.
3) Finally, we re-centered the initial 28-year monthly mean climatology for a calendar month ---- from the time center (temporal mid-point) of 1985-2012 (i.e., 1998.5), to the time-center of 1985-1990 plus 1993 (i.e., 1988.286). The resultant, final climatology posted on this web page has a reference time period of 1985-1990 plus 1993 only.
We derived the climatology for the Version 2.1 Thermal History product suite this way to allow us to:
a) use a sufficiently long time series (1985-2012) of daily SSTs to adequately capture inter-annual SST variability in the initial climatology, but then
b) maintain, in the final climatology produced, the baseline time period of 1985-1990 plus 1993. This baseline time period is used in CRW's heritage 50km climatology and subsequent 5km climatologies (both current and historical)1.
Where relevant, the range of values calculated from analyzed pixels is shown below in [brackets] after each metric name.
Warmest Month, Coolest Month, Climatological Temperature Range [0.4-16.1°C] and Monthly Climatology [12.7-34.3°C]: The Warmest and Coolest Months are identified from the Monthly Climatology, and the Climatological Range derived from those values.
1Heron SF, et al. (2014) Climatology development for NOAA Coral Reef Watch's 5-km product suite. NOAA Technical Report NESDIS 145. NOAA/NESDIS. College Park, MD. 30pp.