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          Institute: MPI für Meteorologie     Collection: Atmosphere in the Earth System     Display Documents



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ID: 277566.0, MPI für Meteorologie / Atmosphere in the Earth System
Effects of ocean biology on the penetrative change on the future chemical composition of the global troposphere
Authors:Wetzel, P.; Maier-Reimer, E.; Botzet, M.; Jungclaus, J.; Keenlyside, N.; Latif, M.
Language:English
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Journal of Climate
Journal Abbrev.:J. Clim.
Volume:19
Issue / Number:Spec. Issue
Start Page:3973
End Page:3987
Title of Issue:CLIMATE MODELS AT THE MAX PLANCK INSTITUTE FOR METEOROLOGY (MPI-M)
Review Status:not specified
Audience:Not Specified
Abstract / Description:The influence of phytoplankton on the seasonal cycle and the mean global climate is investigated in a fully coupled climate model. The control experiment uses a fixed attenuation depth for shortwave radiation, while the attenuation depth in the experiment with biology is derived from phytoplankton concentrations simulated with a marine biogeochemical model coupled online to the ocean model. Some of the changes in the upper ocean are similar to the results from previous studies that did not use interactive atmospheres, for example, amplification of the seasonal cycle; warming in upwelling regions, such as the equatorial Pacific and the Arabian Sea; and reduction in sea ice cover in the high latitudes. In addition, positive feedbacks within the climate system cause a global shift of the seasonal cycle. The onset of spring is about 2 weeks earlier, which results in a more realistic representation of the seasons. Feedback mechanisms, such as increased wind stress and changes in the shortwave radiation, lead to significant warming in the midlatitudes in summer and to seasonal modifications of the overall warming in the equatorial Pacific. Temperature changes also occur over land where they are sometimes even larger than over the ocean. In the equatorial Pacific, the strength of interannual SST variability is reduced by about 10%–15% and phase locking to the annual cycle is improved. The ENSO spectral peak is broader than in the experiment without biology and the dominant ENSO period is increased to around 5 yr. Also the skewness of ENSO variability is slightly improved. All of these changes lead to the conclusion that the influence of marine biology on the radiative budget of the upper ocean should be considered in detailed simulations of the earth’s climate.
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Ocean in the Earth System
MPI für Meteorologie/Atmosphere in the Earth System
MPI für Meteorologie/IMPRS Earth System Modelling
Identifiers:DOI:10.1175/JCLI3828.1
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