Gnanadesikan_JHU9366_web

Anand Gnanadesikan

Professor

327 Olin Hall
410-516-0722
gnanades@jhu.edu
Curriculum Vitae
Personal Website

Biography
Research
Teaching
Publications

Anand Gnanadesikan trained as an oceanographer. His primary expertise is in how the ocean circulates and influences marine life, climate, and atmospheric chemistry. Gnanadesikan earned his PhD from the MIT/Woods Hole Joint Program in physical oceanography and spent more than 15 years at Princeton University and NOAA’s Geophysical Fluid Dynamics Laboratory working to develop computer models of how the planet works.

He joined the John Hopkins faculty in January 2011.

I use numerical models and large datasets to explore how the ocean interacts with the biosphere, atmosphere and cryosphere. Areas of particular interest include:

1. The role of mixing in setting the large scale circulation and chemical properties of the ocean. Because the ocean is strongly stratified and weakly forced, exchange between the deep interior and surface can take many, many years. I’ve looked at the role of breaking internal waves which mix in the vertical in driving this exchange- arguing that they play a much smaller role than previously thought. By contrast, the oceanic equivalent of weather systems are much more important.

2. Modeling ocean biology and chemistry: My interests in understanding vertical exchange has led to a productive line of research looking at oceanic tracers, which are often more sensitive to mixing than are temperature and salinity. Particular interests include radiocarbon and open-ocean hypoxia. I’m also interested in ways that biological cycling can feed back on the physical climate, through altering the carbon cycle and ocean color.

3. Understanding variability in the Earth System: My interests here lie in understanding the physics by which the climate system changes on time scales ranging from annual to multimillennial. The Southern Ocean is a primary region of interest here, though in recent years I’ve started looking more at tropical variability and the North Atlantic as well.

270.103: Introduction to Global Environmental Change and Sustainability
270.224: Oceans and Atmospheres (Spring semester)
270.323: Ocean Biogeochemical Cycles (Even year spring semester)
270.325: Introductory Oceanography (Odd year spring semester)
270.611: Advanced Atmospheric Dynamics
270.644: Physics of Climate Variability (next taught Fall 2014)
270.645: Earth System Modeling

Displaying the 20 most recent publications. (Please refresh the page if no publications initially appear.)

View the Google Scholar Profile for complete publications list.

WJM Seviour, A Gnanadesikan, DW Waugh
The Transient Response of the Southern Ocean to Stratospheric Ozone Depletion
Journal of Climate, 2016

S Sedigh Marvasti, A Gnanadesikan, AA Bidokhti, JP Dunne, S Ghader
Challenges in modeling spatiotemporally varying phytoplankton blooms in the Northwestern Arabian Sea and Gulf of Oman
Biogeosciences 13 (4), 1049-1069, 2016

SS Marvasti, A Gnanadesikan, AA Bidokhti, JP Dunne, S Ghader
Challenges in modeling spatiotemporally varying phytoplankton blooms in the Northwestern Arabian Sea and Gulf of Oman
BIOGEOSCIENCES 13 (4), 1049-1069, 2016

A Gnanadesikan, JL Sarmiento
Mode and Intermediate Waters in Earth System Models
Johns Hopkins University, 2015

S Rivero-Calle, A Gnanadesikan, CE Del Castillo, WM Balch, ...
Multidecadal increase in North Atlantic coccolithophores and the potential role of rising CO2
Science 350 (6267), 1533-1537, 2015

SS Marvasti, A Gnanadesikan, AA Bidokhti, JP Dunne, S Ghader
Challenges in modelling spatiotemporally varying phytoplankton blooms in the Northwestern Arabian Sea and Gulf of Oman
Biogeosciences Discussions 12 (13), 2015

E Ramudu, BH Hirsh, P Olson, A Gnanadesikan
Turbulent heat exchange between water and ice at an evolving ice-water interface
arXiv preprint arXiv:1512.00303, 2015

ED Galbraith, JP Dunne, A Gnanadesikan, RD Slater, JL Sarmiento, ...
Complex functionality with minimal computation: Promise and pitfalls of reduced‐tracer ocean biogeochemistry models
Journal of Advances in Modeling Earth Systems 7 (4), 2012-2028, 2015

E Ramudu, B Hirsh, P Olson, A Gnanadesikan
Forced convective melting at an evolving ice-water interface
APS Meeting Abstracts, 2015

A Goswami, PL Olson, LA Hinnov, A Gnanadesikan
OESbathy version 1.0: a method for reconstructing ocean bathymetry with generalized continental shelf-slope-rise structures
Geoscientific Model Development 8 (9), 2735-2748, 2015

GE Kim, MA Pradal, A Gnanadesikan
Quantifying the biological impact of surface ocean light attenuation by colored detrital matter in an ESM using a new optical parameterization
Biogeosciences 12 (16), 5119-5132, 2015

A Gnanadesikan, MA Pradal, R Abernathey
Exploring the isopycnal mixing and helium–heat paradoxes in a suite of Earth system models
Ocean Science 11 (4), 591-605, 2015

JL Thomas, DW Waugh, A Gnanadesikan
Southern Hemisphere extratropical circulation: Recent trends and natural variability
Geophysical Research Letters 42 (13), 5508-5515, 2015

A Gnanadesikan, MA Pradal, R Abernathey
Isopycnal mixing by mesoscale eddies significantly impacts oceanic anthropogenic carbon uptake
Geophysical Research Letters 42 (11), 4249-4255, 2015

A Goswami, PL Olson, LA Hinnov, A Gnanadesikan
OESbathy version 1.0: a method for reconstructing ocean bathymetry with realistic continental shelf-slope-rise structures.
Geoscientific Model Development Discussions 8 (4), 2015

GE Kim, MA Pradal, A Gnanadesikan
A new parameterization for surface ocean light attenuation in Earth System Models: assessing the impact of light absorption by colored detrital material.
Biogeosciences Discussions 12 (5), 2015

N Towles, P Olson, A Gnanadesikan
Scaling laws for perturbations in the ocean-atmosphere system following large CO 2 emissions
Climate of the Past 11 (7), 991, 2015

AK Dezfuli, BF Zaitchik, A Gnanadesikan
Regional atmospheric circulation and rainfall variability in south equatorial Africa
Journal of Climate 28 (2), 809-818, 2015

I Marinov, A Cabré, A Gnanadesikan, H Yoon
Southern Ocean Convection and tropical telleconnections
AGU Fall Meeting Abstracts 1, 3237, 2014

A Gnanadesikan, MAS Pradal, I Koszalka, RP Abernathey
Towards a more consistent picture of isopycnal mixing in climate models
AGU Fall Meeting Abstracts 1, 3324, 2014