Preprints
https://doi.org/10.5194/egusphere-2024-2431
https://doi.org/10.5194/egusphere-2024-2431
06 Aug 2024
 | 06 Aug 2024

Observation based temperature and freshwater noise over the Atlantic Ocean

Amber A. Boot and Henk A. Dijkstra

Abstract. The ocean is forced at the surface by a heat flux and freshwater flux field from the atmosphere. Short time-scale variability in these fluxes, i.e. noise, can influence long-term ocean variability and might even affect the Atlantic Meridional Overturning Circulation (AMOC). Often this noise is assumed to be Gaussian, but detailed analyses of its statistics appear to be lacking. Here we study the noise characteristics in reanalysis data for two fields which are commonly used to force ocean-only models: evaporation minus precipitation and 2 m air temperature. We construct several noise models for both fields, and a point wise Normal Inverse Gaussian distribution model shows best performance. An analysis of CMIP6 models shows that these models do a reasonable job in representing the standard deviation and skewness of the noise, but the excess kurtosis is more difficult to capture. The point wise noise model performs better than the CMIP6 models and can be used as forcing in ocean-only models to study, for example, noise-induced transitions of the AMOC.

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Amber A. Boot and Henk A. Dijkstra

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-2431', Anonymous Referee #1, 12 Sep 2024
  • RC2: 'Comment on egusphere-2024-2431', Anonymous Referee #2, 16 Sep 2024

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-2431', Anonymous Referee #1, 12 Sep 2024
  • RC2: 'Comment on egusphere-2024-2431', Anonymous Referee #2, 16 Sep 2024
Amber A. Boot and Henk A. Dijkstra

Data sets

ESD_noise_2024 Amber A. Boot https://doi.org/10.5281/zenodo.13148972

Amber A. Boot and Henk A. Dijkstra

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Short summary
The ocean is forced at the surface by a heat flux and freshwater flux. This noise can influence long-term ocean variability and the large scale circulation. Here we study noise characteristics in reanalysis data for these fluxes. We try to capture the noise characteristics by using several noise models and compare these to state-of-the-art climate models. A point wise noise model performs better than the climate models and can be used as forcing in ocean-only models to study.