C Merchant and all the SST CCI Phase 2 Team

SST CCI Update

FM | ECSAT | 08/02/2019 | Slide 2

SST CCI v2.0 and v2.1 Generated and Available

• Climate data record of SST from 1981 to 2016• Integrated across L2, L3 and L4• Routinely funded for extension within C3S (“seamless” data 2017 onwards)• Improved ATSR-record SST results (“lynch pin”)• Significant progress towards strengthening recent decades’ CDR with PMW

• Better feature resolution in L4 product• Successful first attempt at “the 1980s”, and understanding of the significant

challenges we face in continuing to improve that period

• V2.0 soon in ODP, v2.1 to follow (contact us for early access)

FM | ECSAT | 08/02/2019 | Slide 3

Satellite data released (more was tried)

FM | ECSAT | 08/02/2019 | Slide 4

Overview of SST CCI data characteristics

ObservationDensity

Uncertainty

~3 SSTs day-1 per 10 km x 10 km

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Climatology (1982 – 2010)

Nearly the current standard climatology window

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Seasonal cycle (1982 – 2010)

Main new feature of v2.1 is that SST anomaly is provided with respect to this climatology

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Global SST anomaly timeseries

Inter-annual andtrend look good

Monthly variabilitytoo high prior to ATSR1:Related to AVHRRcalibration fluctuations

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ENSO signal

ENSO signal looks very good

ENSO peak in 1982 istoo highby ~0.4 K (a “bad month”)

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Irish & Celtic Sea ; Coral Sea

UK waters regime shift

GBR coral bleaching

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The Pacific Blob and the Atlantic Anti-blob

Sub-polar Atl.

Resilient NW Pacific anomaly

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Experimental PMW SST CDR

New resultson PMW SSTlook promisingfor complementingIR-based record

More uncertain, poorer resolution,but beneficialcoverage

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Improved feature resolution in level 4

• New flow-dependence of weight of observations relative to background

Standard deviation of Argo – analysis differences for improved regions

Spectral analysis Gulf Stream region in JFM 2017

v1. v2.

v1. v2.

FM | ECSAT | 08/02/2019 | Slide 13

Future Developments

NEW R&D on SST ECV• Will commence in July 2019• Version 3 target date: summer 2021

• Meanwhile, C3S generation ongoing using v2.0 processor• Currently ~6 months behind present

• Objectives for v3.0 relative to v2.1• Develop means to include more 1980s sensors

• “dilute” errors and improve stability• Using Metop and SLSTR series, R&D to extend CDR to 2020• Inclusion of PMW SST, harmonized to IR SST for stability (TBC)