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Group for High Resolution Sea Surface Temperature (GHRSST) analysis fields inter-comparisons—Part 2: Near real time web-based level 4 SST Quality Monitor (L4-SQUAM)

Group for High Resolution Sea Surface Temperature (GHRSST) analysis fields inter-comparisons—Part 2: Near real time web-based level 4 SST Quality Monitor (L4-SQUAM)
Group for High Resolution Sea Surface Temperature (GHRSST) analysis fields inter-comparisons—Part 2: Near real time web-based level 4 SST Quality Monitor (L4-SQUAM)
There are a growing number of level 4 (L4; gap-free gridded) sea surface temperature (SST) products generated by blending SST data from various sources which are available for use in a wide variety of operational and scientific applications. In most cases, each product has been developed for a specific user community with specific requirements guiding the design of the product. Consequently differences between products are implicit. In addition, anomalous atmospheric conditions, satellite operations and production anomalies may occur which can introduce additional differences. This paper describes a new web-based system called the L4 SST Quality Monitor (L4-SQUAM) developed to monitor the quality of L4 SST products.

L4-SQUAM intercompares thirteen L4 products with 1-day latency in an operational environment serving the needs of both L4 SST product users and producers. Relative differences between products are computed and visualized using maps, histograms, time series plots and Hovmöller diagrams, for all combinations of products. In addition, products are compared to quality controlled in situ SST data (available from the in situ SST Quality Monitor, iQUAM, companion system) in a consistent manner. A full history of products statistics is retained in L4-SQUAM for time series analysis. L4-SQUAM complements the two other Group for High Resolution SST (GHRSST) tools, the GHRSST Multi Product Ensemble (GMPE) and the High Resolution Diagnostic Data Set (HRDDS) systems, documented in part 1 of this paper and elsewhere, respectively.

Our results reveal significant differences between SST products in coastal and open ocean areas. Differences of >2 °C are often observed at high latitudes partly due to different treatment of the sea-ice transition zone. Thus when an ice flag is available, the intercomparisons are performed in two ways: including and excluding ice-flagged grid points. Such differences are significant and call for a community effort to understand their root cause and ensure consistency between SST products. Future work focuses on including the remaining daily L4 SST products, accommodating for newer L4 SSTs which resolve the diurnal variability and evaluating retrospectively regenerated L4 SSTs to support satellite data reprocessing efforts aimed at generating improved SST Climate Data Records.
Sea surface temperature, Intercomparison, Climate data, Sea ice, Data centers
0967-0645
31-43
Dash, Prasanjit
c2104c98-cfc8-49d4-9ca9-e58a4044a395
Ignatov, Alexander
a5cfa365-2a84-4b0f-9a78-c9b611822126
Martin, Matthew
85d62a4b-8bab-44ab-9d7a-810acaa60f89
Donlon, Craig
2196bb9f-3534-4143-85c7-882a084e8a18
Brasnett, Bruce
40348004-e7c3-427e-b174-48ac047dc263
Reynolds, Richard W.
7395eed8-a7f0-45d3-8765-05bf577eeb77
Banzon, Viva
ac89683a-087f-471e-8a30-240f8a10335e
Beggs, Helen
a21ebce8-9ae0-4295-9757-5ea6f6adbdda
Cayula, Jean-Francois
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Chao, Yi
72cd2c18-9fa5-4429-af47-ec27996ce953
Grumbine, Robert
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Maturi, Eileen
2462babe-8ca9-431a-aecc-dad52c321831
Harris, Andy
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Mittaz, Jonathan
40d7cb57-8aac-46de-828b-bc683bebde34
Sapper, John
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Chin, Toshio M.
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Vazquez-Cuervo, Jorge
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Armstrong, Edward M.
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Gentemann, Chelle
5cd3788d-0093-4813-b295-69079909be77
Cummings, James
c854e022-91ed-4dce-9f00-a85c99149e36
Piollé, Jean-François
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Autret, Emmanuelle
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Roberts-Jones, Jonah
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Ishizaki, Shiro
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Høyer, Jacob L.
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Poulter, Dave
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Dash, Prasanjit
c2104c98-cfc8-49d4-9ca9-e58a4044a395
Ignatov, Alexander
a5cfa365-2a84-4b0f-9a78-c9b611822126
Martin, Matthew
85d62a4b-8bab-44ab-9d7a-810acaa60f89
Donlon, Craig
2196bb9f-3534-4143-85c7-882a084e8a18
Brasnett, Bruce
40348004-e7c3-427e-b174-48ac047dc263
Reynolds, Richard W.
7395eed8-a7f0-45d3-8765-05bf577eeb77
Banzon, Viva
ac89683a-087f-471e-8a30-240f8a10335e
Beggs, Helen
a21ebce8-9ae0-4295-9757-5ea6f6adbdda
Cayula, Jean-Francois
17fb9e78-87f8-4802-88e4-947b753a87cc
Chao, Yi
72cd2c18-9fa5-4429-af47-ec27996ce953
Grumbine, Robert
747ffb7c-1c27-4022-b718-937de985c331
Maturi, Eileen
2462babe-8ca9-431a-aecc-dad52c321831
Harris, Andy
6d3cb222-5053-4278-a948-b0fca88dafb7
Mittaz, Jonathan
40d7cb57-8aac-46de-828b-bc683bebde34
Sapper, John
587a38eb-c4c6-4358-92d3-6c2785edc319
Chin, Toshio M.
41dfb820-8ad3-4dca-a30f-a5c631398d0a
Vazquez-Cuervo, Jorge
f1a21678-93a1-4e40-87f9-8aa73b31093d
Armstrong, Edward M.
90544ecf-d109-4aca-ab93-c3e151c67960
Gentemann, Chelle
5cd3788d-0093-4813-b295-69079909be77
Cummings, James
c854e022-91ed-4dce-9f00-a85c99149e36
Piollé, Jean-François
2a98c698-42e7-4aa8-8784-f89980f1e306
Autret, Emmanuelle
c8490e81-a8ac-4521-89a4-93be7efcb4d9
Roberts-Jones, Jonah
4d267782-afae-4a3c-bcf0-a720dc142853
Ishizaki, Shiro
6d23ca1c-50ac-4921-ad85-575697fcf510
Høyer, Jacob L.
25ba4f28-1982-485b-afa2-a76a43c2cd67
Poulter, Dave
2a9e5cff-b811-41d6-97ac-8d8ae5e1f554

Dash, Prasanjit, Ignatov, Alexander, Martin, Matthew, Donlon, Craig, Brasnett, Bruce, Reynolds, Richard W., Banzon, Viva, Beggs, Helen, Cayula, Jean-Francois, Chao, Yi, Grumbine, Robert, Maturi, Eileen, Harris, Andy, Mittaz, Jonathan, Sapper, John, Chin, Toshio M., Vazquez-Cuervo, Jorge, Armstrong, Edward M., Gentemann, Chelle, Cummings, James, Piollé, Jean-François, Autret, Emmanuelle, Roberts-Jones, Jonah, Ishizaki, Shiro, Høyer, Jacob L. and Poulter, Dave (2012) Group for High Resolution Sea Surface Temperature (GHRSST) analysis fields inter-comparisons—Part 2: Near real time web-based level 4 SST Quality Monitor (L4-SQUAM). Deep Sea Research Part II: Topical Studies in Oceanography, 77-80, 31-43. (doi:10.1016/j.dsr2.2012.04.002).

Record type: Article

Abstract

There are a growing number of level 4 (L4; gap-free gridded) sea surface temperature (SST) products generated by blending SST data from various sources which are available for use in a wide variety of operational and scientific applications. In most cases, each product has been developed for a specific user community with specific requirements guiding the design of the product. Consequently differences between products are implicit. In addition, anomalous atmospheric conditions, satellite operations and production anomalies may occur which can introduce additional differences. This paper describes a new web-based system called the L4 SST Quality Monitor (L4-SQUAM) developed to monitor the quality of L4 SST products.

L4-SQUAM intercompares thirteen L4 products with 1-day latency in an operational environment serving the needs of both L4 SST product users and producers. Relative differences between products are computed and visualized using maps, histograms, time series plots and Hovmöller diagrams, for all combinations of products. In addition, products are compared to quality controlled in situ SST data (available from the in situ SST Quality Monitor, iQUAM, companion system) in a consistent manner. A full history of products statistics is retained in L4-SQUAM for time series analysis. L4-SQUAM complements the two other Group for High Resolution SST (GHRSST) tools, the GHRSST Multi Product Ensemble (GMPE) and the High Resolution Diagnostic Data Set (HRDDS) systems, documented in part 1 of this paper and elsewhere, respectively.

Our results reveal significant differences between SST products in coastal and open ocean areas. Differences of >2 °C are often observed at high latitudes partly due to different treatment of the sea-ice transition zone. Thus when an ice flag is available, the intercomparisons are performed in two ways: including and excluding ice-flagged grid points. Such differences are significant and call for a community effort to understand their root cause and ensure consistency between SST products. Future work focuses on including the remaining daily L4 SST products, accommodating for newer L4 SSTs which resolve the diurnal variability and evaluating retrospectively regenerated L4 SSTs to support satellite data reprocessing efforts aimed at generating improved SST Climate Data Records.

This record has no associated files available for download.

More information

Published date: 2012
Keywords: Sea surface temperature, Intercomparison, Climate data, Sea ice, Data centers
Organisations: National Oceanography Centre

Identifiers

Local EPrints ID: 342968
URI: http://eprints.soton.ac.uk/id/eprint/342968
ISSN: 0967-0645
PURE UUID: 02d3e236-1dc5-4467-925f-e70e7f3b9a9c

Catalogue record

Date deposited: 18 Sep 2012 15:09
Last modified: 25 Nov 2021 17:06

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Contributors

Author: Prasanjit Dash
Author: Alexander Ignatov
Author: Matthew Martin
Author: Craig Donlon
Author: Bruce Brasnett
Author: Richard W. Reynolds
Author: Viva Banzon
Author: Helen Beggs
Author: Jean-Francois Cayula
Author: Yi Chao
Author: Robert Grumbine
Author: Eileen Maturi
Author: Andy Harris
Author: Jonathan Mittaz
Author: John Sapper
Author: Toshio M. Chin
Author: Jorge Vazquez-Cuervo
Author: Edward M. Armstrong
Author: Chelle Gentemann
Author: James Cummings
Author: Jean-François Piollé
Author: Emmanuelle Autret
Author: Jonah Roberts-Jones
Author: Shiro Ishizaki
Author: Jacob L. Høyer
Author: Dave Poulter

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