Conference Papers Year : 2024

Analysis of the vertical variability and temporal frequency of the chlorophyll forcing field on temperature in the Mediterranean Sea and potential implications for regional climate projections

Abstract

This work examines the impact of using a chlorophyll field to force the NEMOMED12 ocean circulation model in the absence of a biogeochemical model, focusing on key physical characteristics, primarily seawater temperature. Our analysis shows that a vertically homogeneous chlorophyll field causes heat accumulation below the Deep Chlorophyll Maximum, leading to a temperature increase over time. Extrapolating the 11-year simulation trend suggests a temperature bias of over +1°C in the intermediate layer after 100 years. To avoid such biases, we recommend using a reconstructed climatology of dimensionless vertical profiles provided by any biogeochemical model (here the Eco3M-MED model). Additionally, using the same chlorophyll field saved at different time frequencies introduces temperature differences between simulations that increase over time, especially in the intermediate layer. The simulation forced by daily chlorophyll is warmer in the surface layers due to the asymmetric impact of chlorophyll extremes on heat distribution.

Domains

Oceanography
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Dates and versions

hal-04598180 , version 1 (18-01-2025)

Identifiers

  • HAL Id : hal-04598180 , version 1

Cite

Yutong Zhang, Melika Baklouti, Florence Sevault, Romain Pennel. Analysis of the vertical variability and temporal frequency of the chlorophyll forcing field on temperature in the Mediterranean Sea and potential implications for regional climate projections. 8th international Med-CORDEX Workshop, May 2024, Rome, Italy. ⟨hal-04598180⟩
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