ORCID Profile
0000-0002-0087-9639
Current Organisations
University of Adelaide
,
U.S. Naval Research Laboratory
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Publisher: American Astronomical Society
Date: 1998
DOI: 10.1086/305015
Publisher: American Geophysical Union (AGU)
Date: 12-1995
DOI: 10.1029/95GL03093
Publisher: American Geophysical Union (AGU)
Date: 27-09-2005
DOI: 10.1029/2005JD005776
Publisher: American Meteorological Society
Date: 09-2006
Publisher: Wiley
Date: 08-2002
DOI: 10.1002/1521-3994(200208)323:3/4<203::AID-ASNA203>3.0.CO;2-L
Publisher: American Association for the Advancement of Science (AAAS)
Date: 13-04-2001
Publisher: American Geophysical Union (AGU)
Date: 02-2004
DOI: 10.1029/2003JA010176
Publisher: American Geophysical Union (AGU)
Date: 16-12-2008
DOI: 10.1029/2008JD010114
Publisher: SPIE
Date: 08-04-2003
DOI: 10.1117/12.462438
Publisher: American Geophysical Union (AGU)
Date: 10-2011
DOI: 10.1029/2011JA016567
Publisher: American Geophysical Union (AGU)
Date: 08-2006
DOI: 10.1029/2005GL025342
Publisher: American Astronomical Society
Date: 12-2002
DOI: 10.1086/343845
Publisher: American Geophysical Union (AGU)
Date: 15-02-2000
DOI: 10.1029/1999GL010744
Publisher: Elsevier BV
Date: 2000
Publisher: Institute of Mathematical Statistics
Date: 05-2002
Publisher: American Geophysical Union (AGU)
Date: 2009
DOI: 10.1029/2008JA013679
Publisher: American Geophysical Union (AGU)
Date: 10-2022
DOI: 10.1029/2021EA002211
Abstract: Observations of solar irradiance made from space since 2003 with 0.1 nm spectral resolution at wavelengths from 115 to 310 nm and 0.5 nm spectral resolution at wavelengths from 260 to 500 nm are used to construct a new model, NRLSSI2h, of solar irradiance variability with higher spectral resolution than the 1 nm NRLSSI2 model used to specify the NOAA Solar Irradiance Climate Data Record. The new model better resolves irradiance variability in specific emission and absorption features that are directly attributable to atoms and molecules in the Sun’s atmosphere. Singularly prominent is spectral irradiance variability at 379–389 nm, dominated by the CN molecular band system irradiance in this 10 nm band increased 0.078 W m −2 during solar cycle 23, contributing 4.6% of the 1.7 W m −2 concurrent total solar irradiance increase. Irradiance variability at wavelengths from 300 to 400 nm, a region dominated by multiple spectral features, is a factor of 2–5 smaller in the new model than estimated by semiempirical models that use radiative transfer codes to calculate the contrasts of faculae and sunspots, which alter the temperature‐dependent densities of these species relative to the surrounding continuum. Solar atmosphere temperature and composition profiles in radiative transfer models may therefore not be realistic or their atomic and molecular databases may be incomplete. Improved colocation of spectral features in solar irradiance and the absorption cross sections of molecular oxygen and ozone with the new model may allow higher fidelity calculations of energy deposition in Earth’s atmosphere.
Publisher: American Geophysical Union (AGU)
Date: 14-01-2011
DOI: 10.1029/2010GL045777
Publisher: American Astronomical Society
Date: 20-05-2005
DOI: 10.1086/429689
Publisher: American Geophysical Union (AGU)
Date: 08-2020
DOI: 10.1029/2019EA000645
Publisher: American Geophysical Union (AGU)
Date: 2005
DOI: 10.1029/2004JA010765
Publisher: Elsevier BV
Date: 2004
Publisher: American Meteorological Society
Date: 28-03-2012
DOI: 10.1175/JCLI-D-11-00571.1
Abstract: Recent observations made by the Spectral Irradiance Monitor (SIM) on the Solar Radiation and Climate Experiment (SORCE) spacecraft suggest that the Sun’s visible and infrared spectral irradiance increased from 2004 to 2008, even as the total solar irradiance measured simultaneously by SORCE’s Total Irradiance Monitor (TIM) decreased. At the same time, solar ultraviolet (UV) irradiance decreased 3–10 times more than expected from prior observations and model calculations of the known effects of sunspot and facular solar features. Analysis of the SIM spectral irradiance observations during the solar minimum epoch of 2008, when solar activity was essentially invariant, exposes trends in the SIM observations relative to both total solar irradiance and solar activity that are unlikely to be solar in origin. The authors suggest that the SIM’s radically different solar variability characterization is a consequence of undetected instrument sensitivity drifts, not true solar spectrum changes. It is thus doubtful that simulations of climate and atmospheric change using SIM measurements are indicative of real terrestrial behavior.
Publisher: American Meteorological Society
Date: 24-01-2014
DOI: 10.1175/JCLI-D-13-00136.1
Abstract: Simulations of the preindustrial and doubled CO2 climates are made with the GISS Global Climate Middle Atmosphere Model 3 using two different estimates of the absolute solar irradiance value: a higher value measured by solar radiometers in the 1990s and a lower value measured recently by the Solar Radiation and Climate Experiment. Each of the model simulations is adjusted to achieve global energy balance without this adjustment the difference in irradiance produces a global temperature change of 0.4°C, comparable to the cooling estimated for the Maunder Minimum. The results indicate that by altering cloud cover the model properly compensates for the different absolute solar irradiance values on a global level when simulating both preindustrial and doubled CO2 climates. On a regional level, the preindustrial climate simulations and the patterns of change with doubled CO2 concentrations are again remarkably similar, but there are some differences. Using a higher absolute solar irradiance value and the requisite cloud cover affects the model’s depictions of high-latitude surface air temperature, sea level pressure, and stratospheric ozone, as well as tropical precipitation. In the climate change experiments it leads to an underestimation of North Atlantic warming, reduced precipitation in the tropical western Pacific, and smaller total ozone growth at high northern latitudes. Although significant, these differences are typically modest compared with the magnitude of the regional changes expected for doubled greenhouse gas concentrations. Nevertheless, the model simulations demonstrate that achieving the highest possible fidelity when simulating regional climate change requires that climate models use as input the most accurate (lower) solar irradiance value.
Publisher: American Geophysical Union (AGU)
Date: 15-08-2009
DOI: 10.1029/2009GL038932
Publisher: American Geophysical Union (AGU)
Date: 2011
DOI: 10.1029/2010JA015901
Publisher: Springer Science and Business Media LLC
Date: 08-2005
Publisher: American Geophysical Union (AGU)
Date: 04-2006
DOI: 10.1029/2005JA011399
Publisher: Springer Science and Business Media LLC
Date: 12-2004
Publisher: Wiley
Date: 23-01-2019
Publisher: Springer Science and Business Media LLC
Date: 02-2020
Publisher: American Geophysical Union (AGU)
Date: 06-2007
DOI: 10.1029/2006JA012074
Publisher: Springer Science and Business Media LLC
Date: 12-01-2010
Publisher: Wiley
Date: 12-02-2022
Publisher: IOP Publishing
Date: 1993
Publisher: American Association for the Advancement of Science (AAAS)
Date: 31-05-2002
Publisher: Wiley
Date: 22-12-2009
DOI: 10.1002/WCC.18
Abstract: How—indeed whether—the Sun's variable energy outputs influence Earth's climate has engaged scientific curiosity for more than a century. Early evidence accrued from correlations of assorted solar and climate indices, and from recognition that cycles near 11, 88 and 205 years are common in both the Sun and climate. 1 , 2 But until recently, an influence of solar variability on climate, whether through cycles or trends, was usually dismissed because climate simulations with (primarily) simple energy balance models indicated that responses to the decadal solar cycle would be so small as to be undetectable in observations. 3 However, in the past decade modeling studies have found both resonant responses and positive feedbacks in the ocean‐atmosphere system that may lify the response to solar irradiance variations. 4 , 5 Today, solar cycles and trends are recognized as important components of natural climate variability on decadal to centennial time scales. Understanding solar‐terrestrial linkages is requisite for the comprehensive understanding of Earth's evolving environment. The attribution of present‐day climate change, interpretation of changes prior to the industrial epoch, and forecast of future decadal climate change necessitate quantitative understanding of how, when, where, and why natural variability, including by the Sun, may exceed, obscure or mitigate anthropogenic changes. Copyright © 2010 John Wiley & Sons, Ltd. This article is categorized under: Paleoclimates and Current Trends Climate Forcing
Publisher: Elsevier BV
Date: 1999
Publisher: American Geophysical Union (AGU)
Date: 06-2010
DOI: 10.1029/2010GL043671
Publisher: American Geophysical Union (AGU)
Date: 09-2008
DOI: 10.1029/2008GL034864
Publisher: American Geophysical Union (AGU)
Date: 07-2009
DOI: 10.1029/2009JA014285
Publisher: Elsevier BV
Date: 12-2003
Publisher: SPIE
Date: 02-11-1998
DOI: 10.1117/12.330255
Publisher: American Geophysical Union (AGU)
Date: 15-09-1998
DOI: 10.1029/98GL02664
Publisher: Elsevier BV
Date: 2000
Publisher: American Geophysical Union (AGU)
Date: 02-2003
DOI: 10.1029/2001JA009238
Publisher: American Geophysical Union (AGU)
Date: 03-2000
DOI: 10.1029/1999GL010759
Publisher: American Geophysical Union (AGU)
Date: 09-2006
DOI: 10.1029/2006GL026711
Publisher: Springer Science and Business Media LLC
Date: 2000
Publisher: Wiley
Date: 04-2018
DOI: 10.1002/2017EA000357
Publisher: American Geophysical Union (AGU)
Date: 02-2019
DOI: 10.1029/2018SW002077
Publisher: American Astronomical Society
Date: 20-09-2002
DOI: 10.1086/344196
Publisher: American Geophysical Union (AGU)
Date: 30-10-2007
DOI: 10.1029/2007EO440001
Publisher: American Geophysical Union (AGU)
Date: 11-2001
DOI: 10.1029/2001GL013969
Publisher: American Geophysical Union (AGU)
Date: 15-08-2000
DOI: 10.1029/2000GL000043
Publisher: American Geophysical Union (AGU)
Date: 24-08-2006
DOI: 10.1029/2005JA011495
Publisher: American Geophysical Union (AGU)
Date: 02-2002
DOI: 10.1029/2001JA000137
Publisher: American Geophysical Union (AGU)
Date: 04-2004
DOI: 10.1029/2004JA010462
Publisher: American Geophysical Union (AGU)
Date: 15-09-2013
DOI: 10.1029/95GL02476
Publisher: American Geophysical Union (AGU)
Date: 06-1995
DOI: 10.1029/95GB00159
Publisher: American Geophysical Union (AGU)
Date: 03-2005
DOI: 10.1029/2004JA010585
Publisher: Springer Science and Business Media LLC
Date: 05-12-2012
No related grants have been discovered for Judith Lean.