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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8193

Authors: Patara, L.*
Vichi, M.*
Masina, S.*
Fogli, P. G.*
Manzini, E.*
Title: Global response to solar radiation absorbed by phytoplankton in a coupled climate model
Title of journal: Climate dynamics
Series/Report no.: 7-8/39(2012)
Publisher: Springer Verlag GMBH Germany
Issue Date: 2012
DOI: 10.1007/s00382-012-1300-9
Keywords: Earth System Model
Abstract: The global climate response to solar radiation absorbed by phytoplankton is investigated by performing multi-century simulations with a coupled ocean–atmosphere-biogeochemistry model. The absorption of solar radiation by phytoplankton increases radiative heating in the near-surface ocean and raises sea surface temperature (SST) by overall ~0.5°C. The resulting increase in evaporation enhances specific atmospheric humidity by 2–5%, thereby increasing the Earth’s greenhouse effect and the atmospheric temperatures. The Hadley Cell exhibits a weakening and poleward expansion, therefore reducing cloudiness at subtropical-middle latitudes and increasing it at tropical latitudes except near the Equator. Higher SST at polar latitudes reduces sea ice cover and albedo, thereby increasing the high-latitude ocean absorption of solar radiation. Changes in the atmospheric baroclinicity cause a poleward intensification of mid-latitude westerly winds in both hemispheres. As a result, the North Atlantic Ocean meridional overturning circulation extends more northward, and the equatorward Ekman transport is enhanced in the Southern Ocean. The combination of local and dynamical processes decreases upper-ocean heat content in the Tropics and in the subpolar Southern Ocean, and increases it at middle latitudes. This study highlights the relevance of coupled ocean–atmosphere processes in the global climate response to phytoplankton solar absorption. Given that simulated impacts of phytoplankton on physical climate are within the range of natural climate variability, this study suggests the importance of phytoplankton as an internal constituent of the Earth’s climate and its potential role in participating in its long-term climate adjustments.
Appears in Collections:03.01.01. Analytical and numerical modeling
Papers Published / Papers in press
03.04.01. Biogeochemical cycles
03.01.03. Global climate models
03.04.02. Carbon cycling
03.03.04. Upper ocean and mixed layer processes
03.01.07. Physical and biogeochemical interactions

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