Andrew Ronald Friedman
BA 2005 (Geography and Philosophy), UC Berkeley
Regional focus: Global, Mesoamerica
My work explores some of the linkages between climate forcings, ocean and atmospheric circulation, and tropical rainfall.
I am a member of the Climate Dynamics Group with Professor John Chiang.
Please feel free to contact me with any questions or ideas!
Interhemispheric Temperature Asymmetry
The temperature contrast between the northern and southern hemispheres - the interhemispheric temperature asymmetry (ITA) - is an emerging indicator of global climate change. Using historical observational datasets and climate model simulations, I am researching the factors that affected the ITA over the 20th century, and the implications of its projected increase over the next century on the Hadley circulation and tropical rainfall.
Cross-Equator Energy Fluxes and the ITCZ
The Intertropical Convergence Zone (ITCZ) is a band of globally maximum rainfall that stretches across much of the Earth near the equator. I am researching how cross-equatorial energy fluxes by the atmosphere affect the latitude of the ITCZ on seasonal and interannual timescales using satellite and reanalysis data.
Climate Variability and Rainfed Agriculture in highland Oaxaca, Mexico
I am part of a collaborative study with agroecology student Paul Rogé and other researchers exploring how climate variability affects rainfed maize agriculture in the Mixteca highlands region of Oaxaca, Mexico.
Rogé, P., A.R. Friedman, M. Astier, and M. Altieri. “Farmer strategies for dealing with climatic variability: A case study from the Mixteca Alta Region of Oaxaca, Mexico.” Submitted to Agroecology and Sustainable Food Systems, November 2013. pdf
Friedman, A.R., Y.-T. Hwang, J.C.H. Chiang, and D.M.W. Frierson (2013): "Interhemispheric temperature asymmetry over the 20th century and in future projections." Journal of Climate, 26 (15), 5419-5433. pdf Nature Geoscience research highlight Climate Central story
Chiang, J.C.H., and A.R. Friedman (2012): "Extratropical Cooling, Interhemispheric Thermal Gradients, and Tropical Climate Change." Annual Review of Earth and Planetary Sciences, 40, 383-412. pdf
Chang, C.-Y., J.C.H. Chiang, M.F. Wehner, A.R. Friedman, and R. Ruedy (2011): “Sulfate aerosol control of Tropical Atlantic climate over the 20th century.” Journal of Climate, 24, 2540-2555. pdf