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J/A+A/531/A6      Evolution of solar irradiance during Holocene  (Vieira+, 2011)

Evolution of the solar irradiance during the Holocene. Vieira L.E.A., Solanki S.K., Krivova N.A., Usoskin I. <Astron. Astrophys. 531, A6 (2011)> =2011A&A...531A...6V
ADC_Keywords: Sun ; Earth Keywords: Sun: activity - Sun: faculae, plages - Sun: surface magnetism - solar-terrestrial relations - sunspots - Sun: UV radiation Abstract: Long-term records of solar radiative output are vital for understanding solar variability and past climate change. Measurements of solar irradiance are available for only the last three decades, which calls for reconstructions of this quantity over longer time scales using suitable models. We present a physically consistent reconstruction of the total solar irradiance for the Holocene. Description: This is a composite total solar irradiance (TSI) time series for 9495BC to 2007AD constructed as described in Sect. 3.3 of the paper. Since the TSI is the main external heat input into the Earth's climate system, a consistent record covering as long period as possible is needed for climate models. This was our main motivation for constructing this composite TSI time series. In order to produce a representative time series, we divided the Holocene into four periods according to the available data for each period. Table 4 (see below) summarizes the periods considered and the models available for each period. After the end of the Maunder Minimum we compute daily values, while prior to the end of the Maunder Minimum we compute 10-year averages. For the period for which both solar disk magnetograms and continuum images are available (period 1) we employ the SATIRE-S reconstruction (Krivova et al. 2003A&A...399L...1K; Wenzler et al. 2006A&A...460..583W). SATIRE-T (Krivova et al. 2010JGRA..11512112K) reconstruction is used from the beginning of the Maunder Minimum (approximately 1640AD) to 1977AD. Prior to 1640AD reconstructions are based on cosmogenic isotopes (this paper). Different models of the Earth's geomagnetic field are available before and after approximately 5000BC. Therefore we treat periods 3 and 4 (before and after 5000BC) separately. Further details can be found in the paper. We emphasize that the reconstructions based on different proxies have different time resolutions. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tsi_hol.dat 46 136619 Total Solar Irradiance (TSI) evolution during the Holocene
Table 4: SATIRE Models employed to construct a representative TSI time series for the Holocene. -------------------------------------------------------------------------------- Index Period Cadence Model Input Data ------------------------------------------------------------------------- 1 1974AD - 2010AD Daily SATIRE-S Full disk magnetograms and continuum images 2 1640AD - 1974AD Daily SATIRE-T Sunspot observations 3 5000BC - 1640AD Decadal SATIRE-M Cosmogenic isotopes (14C; VADM and VDM geomagnetic field) 4 9495BC - 5000BC Decadal SATIRE-M Cosmogenic isotopes (14C; VADM geomagnetic field) ------------------------------------------------------------------------- Note: We replaced missing values from 1 From 1974AD to 1977 missing values computed employing SATIRE-S were replaced by SaTIRE-T. Byte-by-byte Description of file: tsi_hol.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Date Date (YYYYY/MM/DD) 13- 23 F11.5 W/m2 TSI ?=-9999.9 Total solar irradiance (1) 25- 35 F11.5 W/m2 TSI10 ?=-9999.9 Total solar irradiance (10-year running after 1640AD) (1) 37- 44 F8.5 W/m2 e_TSI ?=-9.9 1-sigma error on TSI 46 I1 --- Model [1/9] Model (2)
Note (1): SATIRE (Spectral and Total Irradiance Reconstructions) TSI composite. Note (2): Models as follows: 1 = SATIRE-S, which models the irradiance during the satellite era with high precision (in its present version since 1974) 2 = SATIRE-T, which computes irradiance during the telescope era (since 1610) 3 = SATIRE-M, M for millennial time scales 9 = NA
Acknowledgements: Luis Eduardo Vieira, luis.vieira(at)cnrs-orleans.fr
(End) Luis Eduardo Vieira [LPC2E], Patricia Vannier [CDS] 26-May-2011
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