CESM1.2 atmospheric surface fields for pre-industrial Southern Ocean hosing experiments ...

IntroductionWe use high-resolution coupled ocean-atmosphere simulations to show that reasonable past melt rates of the Antarctic Ice Sheet can have led to shifts of the ITCZ through large-scale surface air temperature changes over the Southern Ocean. Through sensitivity experiments employing slightl...

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Bibliographic Details
Main Authors: Bakker, Pepijn, Prange, Matthias
Format: Dataset
Language:English
Published: PANGAEA 2018
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Center for Marine Environmental Sciences MARUM
Antarc*
Antarctic
Ice Sheet
Sea ice
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.891414
https://doi.pangaea.de/10.1594/PANGAEA.891414
Description
Summary:IntroductionWe use high-resolution coupled ocean-atmosphere simulations to show that reasonable past melt rates of the Antarctic Ice Sheet can have led to shifts of the ITCZ through large-scale surface air temperature changes over the Southern Ocean. Through sensitivity experiments employing slightly negative to large positive meltwater fluxes we deduce that meridional shifts of the Hadley cell and therewith the ITCZ are, to a first order, a linear response to Southern Hemisphere high-latitude surface air temperature changes and Antarctic Ice Sheet melt rates.MethodsThe simulations were performed using the Community Earth System Model version1.2 (CESM1.2), a global climate model that includes interactive atmosphere (CAM4), ocean (POP2), land (CLM4.0; including carbon-nitrogen dynamics), and sea-ice (CICE4) components. For the atmosphere (running with a finite volume dynamical core) and land a horizontal resolution of 0.9° x 1.25° was used with the former having 26 vertical levels. The ocean and sea-ice ... : File descriptionThere are 5 different experiments, namely a pre-industrial (PI) control experiment (PI.001) and 4 experiments including different amount of freshwater added to the Southern Ocean (namely -48 mSv, 48 mSv, 100 mSv and 200 mSv, referred to as PIm48, PI48, PI100 and PI200, respectively). For every of these experiments 7 atmospheric surface variables are included:PRECC (Convective precipitation rate (liq + ice); m/s)PRECL (Large-scale (stable) precipitation rate (liq + ice); m/s)PS (Surface pressure; Pa)PSL (Sea level pressure; Pa)TREFHT (Reference height temperature; K)U (Zonal wind; m/s)V (Meridional wind; m/s) ...

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