NERSCPowering Scientific Discovery for 50 Years

Hannah Ross

Hannah E. Ross, Ph.D.
HPC Performance Engineer
Application Performance Group

Biographical Sketch

Hannah is a member of the Application Performance group. Her work focuses on optimizing the Energy Exascale Earth System Model (E3SM) as a part of the NERSC Exascale Science Applications Program (NESAP). She is currently working on profiling the cloud and turbulence module in the Simple Cloud-Resolving E3SM Atmosphere Model (SCREAM) which is being developed to target a 3 km resolution to better resolve cloud physics.


Hannah’s background is in computational cosmology. Before joining NERSC Hannah did her PhD at the University of Sussex (UK) and did a postdoc in the Computational Research Division here at LBNL. Her research focused on adding new physics to massively parallel cosmological simulations to be run on HPC systems.



Journal Articles

Hannah E Ross, Sambit K Giri, Garrelt Mellema, Keri L Dixon, Raghunath Ghara, Ilian T Iliev, "Redshift-space distortions in simulations of the 21-cm signal from the cosmic dawn", Journal, July 9, 2021, 506:3717–3733, doi: 10.1093/mnras/stab1822

Catherine A Watkinson, Sambit K Giri, Hannah E Ross, Keri L Dixon, Ilian T Iliev, Garrelt Mellema, Jonathan R Pritchard, "The 21-cm bispectrum as a probe of non-Gaussianities due to X-ray heating", Journal, January 2020, 482:2653–2669, doi: 10.1093/mnras/sty2740

Hannah E Ross, Keri L. Dixon, Raghunath Ghara, Ilian T. Iliev, Garrelt Mellema, "Evaluating the QSO contribution to the 21-cm signal from the Cosmic Dawn", Journal, July 2019, 487:1101–1119, doi: /10.1093/mnras/stz1220

Hannah E Ross, Keri L Dixon, Ilian T Iliev, Garrelt Mellema, "Simulating the impact of X-ray heating during the cosmic dawn", July 2017, 468:3785–379, doi: 10.1093/mnras/stx649

Conference Papers

Hannah E Ross, Keri L Dixon, Ilian T Iliev, Garrelt Mellema, "New simulation of QSO X-ray heating during the Cosmic Dawn", Conference, Dubrovnik, Croatia, Cambridge University Press, May 8, 2018, 12:34 - 38, doi:


Simulating the 21-cm Signal during the Cosmic Dawn, Hannah Elizabeth Ross, PhD, University of Sussex, July 2018,