Thermal structures at the sea surface are known to affect the overlying atmospheric dynamics over various spatio-temporal scales, from hourly and sub-kilometric to annual and O(1,000 km). The relevant mechanisms at play are generally identified by means of correlation coefficients (in space or time) or by linear regression analysis using appropriate couples of variables. For fine spatial scales, where sea surface temperature (SST) gradients get stronger, the advection might disrupt these correlations and, thus, mask the action of such mechanisms, just because of the chosen metrics. For example, at the oceanic sub-mesoscale, around 1–10 km and hourly time scales, the standard metrics used to identify the pressure adjustment mechanism (that involves the Laplacian of sea surface temperature, SST, and the wind divergence) may suffer from this issue, even for weak wind conditions. By exploiting high-resolution realistic numerical simulations with ad hoc SST forcing fields, we introduce some new metrics to evaluate the action of the pressure adjustment atmospheric response to the surface oceanic thermal structures. It is found that the most skillful metrics is based on the wind divergence and the SST second spatial derivative evaluated in the across direction of a locally defined background wind field.

Meroni, A., Desbiolles, F., Pasquero, C. (2022). Introducing New Metrics for the Atmospheric Pressure Adjustment to Thermal Structures at the Ocean Surface. JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES, 127(16), 1-16 [10.1029/2021JD035968].

Introducing New Metrics for the Atmospheric Pressure Adjustment to Thermal Structures at the Ocean Surface

Meroni, Agostino N.
;
Desbiolles, Fabien;Pasquero, Claudia
2022

Abstract

Thermal structures at the sea surface are known to affect the overlying atmospheric dynamics over various spatio-temporal scales, from hourly and sub-kilometric to annual and O(1,000 km). The relevant mechanisms at play are generally identified by means of correlation coefficients (in space or time) or by linear regression analysis using appropriate couples of variables. For fine spatial scales, where sea surface temperature (SST) gradients get stronger, the advection might disrupt these correlations and, thus, mask the action of such mechanisms, just because of the chosen metrics. For example, at the oceanic sub-mesoscale, around 1–10 km and hourly time scales, the standard metrics used to identify the pressure adjustment mechanism (that involves the Laplacian of sea surface temperature, SST, and the wind divergence) may suffer from this issue, even for weak wind conditions. By exploiting high-resolution realistic numerical simulations with ad hoc SST forcing fields, we introduce some new metrics to evaluate the action of the pressure adjustment atmospheric response to the surface oceanic thermal structures. It is found that the most skillful metrics is based on the wind divergence and the SST second spatial derivative evaluated in the across direction of a locally defined background wind field.
No
Articolo in rivista - Articolo scientifico
Scientifica
air-sea interactions, atmospheric dynamics, numerical simulations
English
1
16
16
Meroni, A., Desbiolles, F., Pasquero, C. (2022). Introducing New Metrics for the Atmospheric Pressure Adjustment to Thermal Structures at the Ocean Surface. JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES, 127(16), 1-16 [10.1029/2021JD035968].
Meroni, A; Desbiolles, F; Pasquero, C
File in questo prodotto:
File Dimensione Formato  
Meroni-2022-JGR Atmospheres-VoR.pdf

accesso aperto

Descrizione: Research Article
Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 4.28 MB
Formato Adobe PDF
4.28 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/391283
Citazioni
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 0
Social impact