Connecting atmospheric composition with climate variability and change

Schedule and Readings

9/5/12 Organizational meeting, Intro to basic concepts

Presenter: Arlene [ppt]
Optional Reading: Radiative Forcing Concept [IPCC AR4 Section 2.2 pp 133-137]
Optional Reading: Atmospheric Lifetimes and Time Scales [ IPCC TAR WGI (The Scientific Basis) Chapter 4 Section 4.1.4]




Non-CO₂ greenhouse gases

9/12/12 Overview: From glacial-interglacial variability to anthropogenic influence

Presenter: Arlene [ppt]
Orbital and millenial scale features of atmospheric CH₄ over the past 800,000 years [Loulergue et al., Nature 2008]
Non-CO₂ greenhouse gases and climate change [Montzka et al., Nature 2011]


9/19/12 Observed methane in recent decades: Emissions Trends or Climate variability?

Presenter: Arlene [ppt]
Recent decreases in fossil-fuel emissions of ethane and methane derived from firn air [Aydin et al., Nature 2011]
Reduced methane growth rate explained by decreased Northern Hemisphere microbial sources [Kai et al., Nature 2011]
The El Nino Southern Oscillation and wetland methane interannual variability [Hodson et al., Geophys. Res. Lett. 2011]
Optional: brief communication follow-up to Kai et al. [Levin et al., Nature 2012]
Optional: perspective on Kai et al. and Aydin et al. [Heimann et al., Nature 2011]
Optional: Observational constraints on recent increases in the atmospheric CH₄ burden [Dlugokencky et al., Geophys. Res. Lett. 2009]


9/26/12 ENSO and ozone variability

Presenter: Isla [ppt]
A new ENSO index derived from satellite measurements of column ozone [Ziemke et al., Atmos. Chem. Phys. 2010]
The response of tropical tropospheric ozone to ENSO [Oman et al., Geophys. Res. Lett. 2011]


10/3/12 Exploiting synergies to mitigate anthropogenic climate change

Presenter: Nora
Nitrous Oxide (N₂O: The dominant ozone-depleting substance emitted in the 21st century[ Ravishankara et al., Science 2009]
Global warming in the twenty-first century: An alternative scenario [ Hansen et al., Proc. Natl. Acad. Sci. 2000]


10/10/12 ENSO, Arctic Oscillation, and strat-to-trop O₃ exchange

Presenter: Libby
Arctic Oscillation modulation of the Northern Hemisphere spring tropospheric ozone [Lamarque and Hess Geophys. Res. Lett. 2004]
Increases in global tropospheric ozone following an El Nino event: examining stratospheric ozone variability as a potential driver[ Voulgarakis et al., Atmos. Sci. Lett. 2011]

10/17/12 Glacial atmospheres: methane and dust

Presenter: Allison
The ice age methane budget [Valdes et al., Geophys. Res. Lett. 2005]
Gustiness: The driver of glacial dustiness? [McGee et al., Quaternary Science Reviews 2010]





Aerosols

10/24/12 Aerosols in the climate system

Presenter: Karen
Aerosol forcings[ IPCC AR4 WG1 Sections 7.5 pp 555-559 and Section 7.5.2.4 and Table 2.2 and Section 2.4.4]


11/7/12 Aerosols: Drivers of variability?

Presenter: Catherine
Aerosols implicated as a prime driver of twentieth-century North Atlantic climate variability[ Booth et al., Nature 2012]
Optional: Forced and Internal Twentieth-Century SST Trends in the North Atlantic [Ting et al., J. Clim. 2009]
Optional: perspective on Booth et al. [Evan Nature 2012]


11/14/12 Black carbon in the climate system

Presenter: John
Global and regional climate changes due to black carbon[ Ramanathan and Carmichael, Nat. Geosci. 2008]
Global cloud condensation nuclei influenced by carbonaceous combustion aerosol [ Spracklen et al., Atmos. Chem. Phys. 2011]


11/21/12 Regional temperature response: dependence on forcing location?

Presenter: Harald
Climate response to regional radiative forcing during the twentieth century[ Shindell and Faluvegi, Nat. Geosci. 2009]
Strong sensitivity of late 21st century climate to projected changes in short-lived air pollutants[ Levy et al. J. Geophys. Res. 2008]


11/28/12 Global dimming/brightening

Presenter: Mike
Global dimming and brightening: A review [ Wild, J. Geophys. Res. 2009]
Optional: How well do IPCC AR4/CMIP3 climate models simulate global dimming/brightening and twentieth century daytime and nighttime warming? [Wild, J. Geophys. Res. 2009]


Terrestrial biogeochemical feedbacks

12/12/12

Presenter: Arlene
Terrestrial biogeochemical feedbacks in the climate system[ Arneth et al., Nat. Geosci. 2010]
Aerosol Indirect Effect on Biogeochemical Cycles and Climate [ Mahowald, Science 2011]
Global-scale attribution of anthropogenic and natural dust sources and their emission rates based on MODIS Deep Blue aerosol products [ Ginoux et al., Rev. of Geophys. 2012]


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