cloud

Brian Medeiros
 Climate & Global Dynamics Division
National Center for Atmospheric Research
Boulder, Colorado, USA

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Current State


I am a Project Scientist I in CGD at NCAR. I am working mostly on evaluating climate models using the CAPT framework and idealized experiments (e.g., aquaplanets).
(see Past States)

Education

PhD/PhC/MS  University of California, Los Angeles
[2007/5/3, Atmospheric & Oceanic Sciences]

B.A. University of California, Berkeley
[2000, Physics]

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Publications

Kay, J. E., B. R. Hillman, S. A. Klein, Y. Zhang, B. Medeiros, R. Pincus, A. Gettelman, B. Eaton, J. Boyle, R. Marchand, and T. P. Ackerman:
Exposing global cloud biases in the Community Atmosphere Model (CAM) using satellite observations and their corresponding instrument simulators,
submitted to J. Climate, CESM Special Issue

de Boer, G., W. Chapman, J. E. Kay, B. Medeiros, M. D. Shupe, S. Vavrus, J. Walsh:
A Characterization of the Present-Day Arctic Atmosphere in CCSM4,
submitted to J. Climate.

B. Medeiros, C. Deser, R. A. Tomas, and J. E. Kay, 2011:
Arctic inversion strength in climate models
J. Climate DOI: 10.1175/2011JCLI3968.1 [link] [details]

B. Medeiros, L. Nuijens, C. Antoniazzi, and B. Stevens, 2010:
Low-latitude boundary layer clouds as seen by CALIPSO
J. Geophys. Res. Atmos., 115, D23207, 12 pp. DOI: 10.1029/2010JD014437 [details]

B. Medeiros and B. Stevens, 2011:
Revealing differences in GCM representations of low clouds
Climate Dynamics , 36(1), pp. 385-399. DOI: 10.1007/s00382-009-0694-5. [details]

Zhang, Y., B. Stevens, B. Medeiros and M. Ghil, 2009:
Low cloud fraction, lower-tropospheric stability and large-scale divergence.
Journal of Climate, 22, 4827-4844. DOI: 10.1175/2009JCLI2891.1 [abstract]

Medeiros, B., B. Stevens, I. M. Held, and M. Zhao, D. L. Williamson, J. G. Olson, and C. S. Bretherton, 2008:
Aquaplanets, climate sensitivity, and low clouds.
Journal of Climate, 21, 4974–4991 DOI: 10.1175/2008JCLI1995.1. [details]

Rauber, R. and co-authors, 2007:
In the Driver’s Seat: RICO and Education.
Bull. Amer. Soc. Meteor. DOI: 10.1175/BAMS-88-12-1929.

Medeiros, B., A. Hall, and B. Stevens, 2005:
What controls the mean depth of the PBL?
Journal of Climate, 18 (16), p. 2877-2892. DOI: 10.1175/JCLI3417.1 [details]

Karner, D. B., J. Levine, B.P. Medeiros, and R.A. Muller, 2002:
Constructing a stacked benthic d18O record.
Paleoceanography, 17(3), p. 2-1 to 2-17. DOI:10.1029/2001PA000667 [abstract]

Presentations & Conference Proceedings

2010:

August 2009:

July 2009: CMMAP 7th Team Meeting, Fort Collins, CO

June 2009:

April 2009: Mesoscale & Microscale Meteorology Seminar, NCAR, Boulder, CO.

Medeiros, B., B. Stevens, and C. Antoniazzi, 2008: A closer look at tropical low clouds in climate models, Eos Trans. AGU, 89(53), Fall Meet. Suppl., San Francisco, CA, Amer. Geophys. Union, Abstract A43C-0332.

October 2008:

June 2008: Pan-GCSS/CFMIP meeting, Toulouse, France.

October 2007: Colorado State University Department of Atmospheric Science Colloquium, Fort Collins, CO.

11 April 2007: Using aquaplanets to understand GCM climate sensitivity. CFMIP/ENSEMBLES Workshop on assessment of cloud and water vapour feedback processes in GCMs, Paris, 11th-13th April, 2007.

7 June 2006: Unraveling cloud feedbacks. NCAR CMS Boulder, CO.

31 May 2006: Unraveling cloud feedbacks. UCLA DAOS, Los Angeles, CA.

8 April 2006: The climate sensitivity of aquaplanets. 1st Graduate Climate Conference, Charles L. Pack Forest educational center, WA, sponsored by PCC.

29 November 2005: How earth-like are the aqua planets? Presentation at the All-hands meeting of Climate Process Team on Low-latitude cloud feedbacks. GFDL, Princeton, NJ.

23 August 2005: Climate change experiments in an idealized GCM. UCLA DAOS Students Seminar Series.

Medeiros, B., A. Hall, and B. Stevens, 2004: What controls the climatological PBL depth? Proc. of 16th Symposium on Boundary Layers and Turbulence, Portland, ME, Amer. Meteor. Soc., 5.1.

Medeiros B.P., A. Hall, B. Stevens, and X. Wang, 2003: What controls the climatological depth of the PBL? Extended Abstracts, 14th Symposium on Global Change and Climate Variations, Long Beach, CA, Amer. Meteor. Soc., 11.1, 4 pp.

Medeiros B.P., D.B. Karner, R.A. Muller, and J. Levine, 2000: The Global Ice Volume Record as Viewed Through a Benthic \delta^{18}O Stack. Eos Trans. AGU, 81 (48), Fall Meet. Suppl., San Francisco, CA, Amer. Geophys. Union, Abstract OS51B-26.

Medeiros B.P., D.B. Karner, and R.A. Muller, 1999: Dansgaard-Oeschger Events and the 1.5-kyr Cycle. Eos Trans. AGU, 80, Fall Meet. Suppl.,San Francisco, CA, Amer. Geophys. Union, Abstract U21A-17.

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Academic Miscellany

July 2007 -- 2009: Post-doc, UCLA-CMMAP, located at CSU Fort Collins

June 2007: Defended PhD dissertation, Cloud-Climate Interactions in GCMs.

5-16 June 2006: The Art of Climate Modeling, ASP Summer Colloquia. Advanced Study Program and the Climate and Global Dynamics Division of NCAR, Boulder, CO. [LINK]

31 May 2006: UCLA AOS 270 department colloquium

Summer 2005: Organized UCLA DAOS (Summer) Students Seminar Series [LINK].

May 2005: University Oral Qualifying Exam ("Proposal")

January 2005: Participated in RICO in Antigua & Barbuda

31 July 2003: UCLA DAS oral comprehensive (M.S. degree)

Fall 2002: TA for AS 2, "air pollution"

July 2002: UCLA DAS written comprehensive exam

2001-2002: Awarded Edwin W. Pauley Fellowship

2001-2002: 1st year at UCLA -- introductory courses in atmospheric sciences

2000-2001: Lab assistant at Lawrence Berkeley Nat'l Lab

2000-2001: Teaching Assistant for UC Berkeley Dept. of Physics

2000-2001: Teaching Assistant for UC Berkeley Extension

May 2000: B.A. from UC Berkeley in Physics

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Past States


While at UC Berkeley, I worked with Rich Muller's Astrogeophysics group and studied paleoclimate. During that time I worked primarily on two topics. First, I did analysis of high frequency climate oscillations. This work was presented to the Institute of Nuclear and Particle Astrophysics in 1999. It was also presented at the Fall 1999 meeting of the AGU, and was submitted at a Berkeley Lab Technical Report. The second project was the construction of a time series called the Benthic Stack, which was published in Paleoceanography in 2002. Prior to that, we presented it at the Fall 2000 meeting of the AGU.

My first project in graduate school was an investigation of the processes that control the mean depth of the planetary boundary layer. I analyzed output from the UCLA GCM and a simple mixed layer mass budget analysis to understand the land-sea contrast in PBL depth, including a simple analytical model of the diurnal cycle of the convective (dry) mixed layer. This work was supervised by Alex Hall and Bjorn Stevens, and the paper can be downloaded in the Publications section.

Upon completing my PhD at UCLA, I became a post-doctoral researcher in Department of Atmospheric and Oceanic Sciences at UCLA, where I continued to work in Bjorn Stevens' research group. Although affiliated with UCLA, my work was funded by the Center for Multiscale Modeling of Atmospheric Processes (CMMAP), based in Fort Collins, Colorado. During 2007-2009 I lived in Fort Collins, and was graciously hosted at CMMAP by Dave Randall. During this time my research focused on isolating and understanding low-cloud effects on climate using numerical models. Read more at research.brian.

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The photograph of cumulus clouds above was taken from Cloudman's Cloud Gallery.