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Surface and tropospheric response of North Atlantic summer climate from paleoclimate simulations of the past millennium

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Pyrina, Maria
Moreno Chamarro, EduardoMés informació
Wagner, Sebastian
Zorita, Eduardo
Document typeArticle
Defense date2021
PublisherMDPI
Rights accessOpen Access
Attribution 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution 3.0 Spain
Abstract
We investigate the effects of solar forcing on the North Atlantic (NA) summer climate, in climate simulations with Earth System Models (ESMs), over the preindustrial past millennium (AD 850–1849). We use one simulation and a four-member ensemble performed with the MPI-ESM-P and CESM-LME models, respectively, forced only by low-scaling variations in Total Solar Irradiance (TSI). We apply linear methods (correlation and regression) and composite analysis to estimate the NA surface and tropospheric climatic responses to decadal solar variability. Linear methods in the CESM ensemble indicate a weak summer response in sea-level pressure (SLP) and 500-hPa geopotential height to TSI, with decreased values over Greenland and increased values over the NA subtropics. Composite analysis indicates that, during high-TSI periods, SLP decreases over eastern Canada and the geopotential height at 500-hPa increases over the subtropical NA. The possible summer response of SSTs is overlapped by model internal variability. Therefore, for low-scaling TSI changes, state-of-the-art ESMs disagree on the NA surface climatic effect of solar forcing indicated by proxy-based studies during the preindustrial millennium. The analysis of control simulations indicates that, in all climatic variables studied, spurious patterns of apparent solar response may arise from the analysis of single model simulations.
Dataset  https://www.earthsystemgrid.org/dataset/ucar.cgd.ccsm4.CESM_CAM5_LME.html
CitationPyrina, M. [et al.]. Surface and tropospheric response of North Atlantic summer climate from paleoclimate simulations of the past millennium. "Atmosphere", 2021, vol. 12, núm. 5, 568. 
URIhttp://hdl.handle.net/2117/345146
DOI10.3390/atmos12050568
ISSN2073-4433
Publisher versionhttps://www.mdpi.com/2073-4433/12/5/568
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