Pedram Hassanzadeh

Jun 6, 2023 | news.rice.edu | Pedram Hassanzadeh

Climate scientists at Rice University have discovered an “internally generated periodicity” — a natural cycle that repeats every 150 days — in the north-south oscillation of atmospheric pressure patterns that drive the movement of the Southern Hemisphere’s prevailing westerly winds and the Antarctic jet stream. “This is something that arises from the internal dynamics of the atmosphere,” said Pedram Hassanzadeh, co-author of a study about the discovery in the open-access journal AGU Advances.

May 26, 2023 | journals.ametsoc.org | Elizabeth Barnes |Pedram Hassanzadeh |Mike Pritchard |Charlotte Connolly

Keywords: Atmospheric circulation; Forcing; Nonlinear dynamics; Data science; Deep learning; Neural networks1. IntroductionThe eddy-driven jet stream drives much of the Northern Hemisphere midlatitude weather (e.g., Nakamura et al. 2004; Athanasiadis et al. 2010; Shaw et al. 2016; Madonna et al. 2017). Consequently, changes in the jet stream position and strength can result in enormous societal impact by impacting heat waves, droughts, and flooding events (Schubert et al.

May 19, 2023 | agupubs.onlinelibrary.wiley.com | Y. Qiang Sun |Pedram Hassanzadeh |M. Alexander |Christopher G. Kruse

Gravity Wave Drag Extraction The three methods used for SGS GWD extraction are: Helmholtz decomposition method: This is a common practice in the GW literature for separating GWs from the background flow (e.g., Callies et al., 2014; Wei et al., 2022).

Feb 13, 2023 | scienmag.com | Yifei Guan |Ashesh Chattopadhyay |Pedram Hassanzadeh

HOUSTON - (Feb. 13, 2023) - One of the oldest tools in computational physics - a 200-year-old mathematical technique known as Fourier analysis - can reveal crucial information about how a form of artificial intelligence called a deep neural network learns to perform tasks involving complex physics like climate and turbulence modeling, according to a new study. Credit: Image courtesy of P. Hassanzadeh/Rice University HOUSTON - (Feb.

Feb 13, 2023 | iopscience.iop.org | Maxime Maurice |Rajdeep Dasgupta |Pedram Hassanzadeh

During their formation, terrestrial planets are thought to go through phases of large-scale melting of their silicate mantles referred to as "magma oceans" (MOs; Elkins-Tanton 2012). Such MOs would represent the most important episodes of rapid chemical equilibration between the mantle and the atmosphere in a planet's history (Abe & Matsui 1985).