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Anand Gnanadesikan

Associate Professor

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

Southern Hemisphere extratropical circulation: Recent trends and natural variability

2015 , Geophysical Research Letters, 2015

Isopycnal mixing by mesoscale eddies significantly impacts oceanic anthropogenic carbon uptake

2015 , Geophysical Research Letters, 2015

OESbathy version 1.0: a method for reconstructing ocean bathymetry with realistic continental shelf-slope-rise structures

2015 , Geoscientific Model Development Discussions 8, 3079-3115, 2015

A new parameterization for surface ocean light attenuation in Earth System Models: assessing the impact of light absorption by colored detrital material

2015 , Biogeosciences Discussions 12 (5), 3905-3942, 2015

Challenges in modelling spatiotemporally varying phytoplankton blooms in the Northwestern Arabian Sea and Gulf of Oman

2015 ,

Scaling laws for perturbations in the ocean-atmosphere system following large CO 2 emissions.

2015 , Climate of the Past Discussions 11 (1), 2015

Regional atmospheric circulation and rainfall variability in South Equatorial Africa

2015 , Journal of Climate 28 (2), 809-818, 2015

SOUTHERN OCEAN CONVECTION AND TROPICAL TELECONNECTIONS

2014 , AGU Fall Meeting Abstracts 1, 3237, 2014

Towards a more consistent picture of isopycnal mixing in climate models

2014 , AGU Fall Meeting Abstracts 1, 3324, 2014

Global Ocean Sedimentation Patterns: Plate Tectonic History Versus Climate Change

2014 , AGU Fall Meeting Abstracts 1, 1406, 2014

Global Paleobathymetry for the Cenomanian-Turonian (90 Ma)

2014 , AGU Fall Meeting Abstracts 1, 1389, 2014

Role of ocean isopycnal mixing in setting the uptake of anthropogenic carbon

2014 , AGU Fall Meeting Abstracts 1, 07, 2014

Exploring the isopycnal mixing and helium-heat paradoxes in a suite of Earth System Models

2014 , Ocean Science Discussions 11 (6), 2533-2567, 2014

How does the Redi parameter for mesoscale mixing impact global climate in an Earth System Model?

2014 , Journal of Advances in Modeling Earth Systems 6 (3), 586-601, 2014

Understanding multidecadal variability in ENSO amplitude

2014 , Journal of Climate 27 (11), 4037-4051, 2014

Connecting Atlantic temperature variability and biological cycling in two earth system models

2014 , Journal of Marine Systems 133, 39-54, 2014

The deep ocean buoyancy budget and its temporal variability

2014 , Journal of Climate 27 (2), 551-573, 2014

A south equatorial African precipitation dipole and the associated atmospheric circulation

2013 , AGU Fall Meeting Abstracts 1, 1050, 2013

Global Paleobathymetry Reconstruction with Realistic Shelf-Slope and Sediment Wedge

2013 , AGU Fall Meeting Abstracts 1, 2520, 2013

Modeling long-term carbon residue in the ocean-atmosphere system following large CO2 emissions

2013 , AGU Fall Meeting Abstracts 1, 1973, 2013

SOMBRA: A scoping study for understanding the intensity of open-ocean hypoxia

2013 , AGU Fall Meeting Abstracts 1, 01, 2013

Three modes of interdecadal trends in sea surface temperature and sea surface height

2013 , AGU Fall Meeting Abstracts 1, 08, 2013

Critical role for mesoscale eddy diffusion in supplying oxygen to hypoxic ocean waters

2013 , Geophysical Research Letters 40 (19), 5194-5198, 2013

Impact of climate warming on upper layer of the Bering Sea

2013 , Climate dynamics 40 (1-2), 327-340, 2013

Ocean Color and the Equatorial Annual Cycle in the Pacific

2012 , AGU Fall Meeting Abstracts 1, 1812, 2012

Processes governing transient responses of the deep ocean buoyancy budget to a doubling of CO2

2012 , AGU Fall Meeting Abstracts 1, 1757, 2012

Investigation of the surface and circulation impacts of cloud-brightening geoengineering

2012 , Journal of Climate 25 (21), 7527-7543, 2012

Investigation of land ice‐ocean interaction with a fully coupled ice‐ocean model: 2. Sensitivity to external forcings

2012 , Journal of Geophysical Research: Earth Surface (2003–2012) 117 (F2), 2012

Investigation of land ice‐ocean interaction with a fully coupled ice‐ocean model: 1. Model description and behavior

2012 , Journal of Geophysical Research: Earth Surface (2003–2012) 117 (F2), 2012

On the coupled response to ice-shelf basal melting

2012 , Journal of Glaciology 58 (208), 203-215, 2012

Understanding why the volume of suboxic waters does not increase over centuries of global warming in an Earth System Model

2012 , Biogeosciences 9 (3), 1159-1172, 2012

Interhemispheric gradient of atmospheric radiocarbon reveals natural variability of Southern Ocean winds

2011 , Climate of the Past 7 (4), 1123-1138, 2011

The impacts of changing transport and precipitation on pollutant distributions in a future climate

2011 , Journal of Geophysical Research: Atmospheres (1984–2012) 116 (D18), 2011

Water mass exchange in the Southern Ocean in coupled climate models

2011 , Journal of Physical Oceanography 41 (9), 1756-1771, 2011

Climate variability and radiocarbon in the CM2Mc Earth System Model

2011 , Journal of Climate 24 (16), 4230-4254, 2011

Will open ocean oxygen stress intensify under climate change?

2011 , Biogeosciences Discussions 8 (4), 7007, 2011

The GFDL CM3 coupled climate model: characteristics of the ocean and sea ice simulations

2011 , Journal of Climate 24 (13), 3520-3544, 2011

What ocean biogeochemical models can tell us about bottom-up control of ecosystem variability

2011 , ICES Journal of Marine Science: Journal du Conseil 68 (6), 1030-1044, 2011

Changes in ocean circulation and carbon storage are decoupled from air-sea CO 2 fluxes

2011 , Biogeosciences 8 (2), 505-513, 2011

Changes in ocean circulation and carbon storage are decoupled from air-sea COsub2/sub fluxes

2011 , Copernicus Publications, 2011

The role of marine biota in the CO2 balance of the ocean-atmosphere system

2011 , The Role of Marine Biotain the Functioning of the Biosphere, 71, 2011

The Role of Marine Biota in the Functioning of the Biosphere

2011 ,

The Role of Marine Biota in the Functioning of the Biosphere

2011 , Fundacion BBVA, 2011

How Ocean Color Influences the Interplay Between Annual and Interannual Tropical Pacific Variability

2010 , AGU Fall Meeting Abstracts 1, 0758, 2010

Changes in ocean circulation and carbon storage are decoupled from air-sea CO2 fluxes

2010 , Biogeosciences Discussions 7 (5), 7985, 2010

Efficiency of small scale carbon mitigation by patch iron fertilization

2010 , Biogeosciences 7 (11), 3593, 2010

Fueling export production: nutrient return pathways from the deep ocean and their dependence on the Meridional Overturning Circulation

2010 , Biogeosciences 7 (11), 3549, 2010

Technical description of the prototype version (v0) of tracers of phytoplankton with allometric zooplankton (TOPAZ) ocean biogeochemical model as used in the Princeton IFMIP model

2010 , Biogeosciences 7 (Supplement), 2010

Low helium flux from the mantle inferred from simulations of oceanic helium isotope data

2010 , Earth and Planetary Science Letters 297 (3), 379-386, 2010

How ocean color can steer Pacific tropical cyclones

2010 , Geophysical Research Letters 37 (18), 2010

Fueling primary productivity: nutrient return pathways from the deep ocean and their dependence on the Meridional Overturning Circulation

2010 , Biogeosciences Discussions 7 (3), 4045, 2010

Regional impacts of iron-light colimitation in a global biogeochemical model

2010 , Proceedings from the 2010 AGU Ocean Sciences Meeting, 2010

Meridional density gradients do not control the Atlantic overturning circulation

2010 , Journal of Physical Oceanography 40 (2), 368-380, 2010

Does the Representation of the Ocean Matter in Climate Projections?: Comparison of GFDL's CM 2 G and CM 2 M Coupled Climate Models

2010 , Proceedings from the 2010 AGU Ocean Sciences Meeting, 2010

Estimating the contribution of strong daily export events to total pollutant export from the United States in summer

2009 , Journal of Geophysical Research: Atmospheres (1984–2012) 114 (D23), 2009

Correction to “Using altimetry to help explain patchy changes in hydrographic carbon measurements”

2009 , Journal of Geophysical Research: Oceans (1978–2012) 114 (C12), 2009

The coupled response to slope-dependent basal melting

2009 , AGU Fall Meeting Abstracts 1, 0446, 2009

How ice shelf morphology controls basal melting

2009 , Journal of Geophysical Research: Oceans (1978–2012) 114 (C12), 2009

Problems and prospects in large-scale ocean circulation models

2009 , Oceanob's 2009, 2009

Using altimetry to help explain patchy changes in hydrographic carbon measurements

2009 , Journal of Geophysical Research: Oceans (1978–2012) 114 (C9), 2009

Regional impacts of ocean color on tropical Pacific variability

2009 , Ocean Science 5 (3), 313, 2009

The Southern Ocean as a driver of centennial to millenial timescale radiocarbon variations

2009 , EGU General Assembly Conference Abstracts 11, 11267, 2009

Atmospheric radiocarbon as a Southern Ocean wind proxy over the last 1000 years

2009 , EGU General Assembly Conference Abstracts 11, 11226, 2009

Ocean water clarity and the ocean general circulation in a coupled climate model

2009 , Journal of Physical Oceanography 39 (2), 314-332, 2009

Impact of ocean shortwave absorption on tropical cyclogenesis

2008 , AGU Fall Meeting Abstracts 1, 04, 2008

Ocean fertilization, carbon credits and the Kyoto Protocol

2008 , AGU Fall Meeting Abstracts 1, 0377, 2008

What Should a Subgridscale Parameterization Look Like?

2008 , AGU Fall Meeting Abstracts 1, 1206, 2008

Ice shelf morphology and the efficiency of basal melting

2008 , AGU Fall Meeting Abstracts 1, 0535, 2008

Large-scale oceanographic constraints on the distribution of melting and freezing under ice shelves

2008 , Journal of Physical Oceanography 38 (10), 2242-2255, 2008

Impact of oceanic circulation on biological carbon storage in the ocean and atmospheric pCO2

2008 , Global Biogeochemical Cycles 22 (3), 2008

Export is not enough: nutrient cycling and carbon sequestration

2008 , Inter-Research, 2008

How does ocean biology affect atmospheric pCO2? Theory and models

2008 , Journal of Geophysical Research: Oceans (1978–2012) 113 (C7), 2008

Effects in a climate model of slope tapering in neutral physics schemes

2007 , Ocean Modelling 16 (1), 1-16, 2007

A synthesis of global particle export from the surface ocean and cycling through the ocean interior and on the seafloor

2007 , Global Biogeochemical Cycles 21 (4), 2007

Carbon sequestration by patch fertilization: A comprehensive assessment using coupled physical-ecological-biogeochemical models: FINAL REPORT of grant Grant No. DE-FG02-04ER63726

2007 , University of California, Los Angeles, 2007

Impact of ocean color on the maintenance of the Pacific Cold Tongue

2007 , Geophysical Research Letters 34 (11), 2007

Deep ocean biogeochemistry of silicic acid and nitrate

2007 , Global Biogeochemical Cycles 21 (1), 2007

How does ocean ventilation change under global warming?

2007 , Ocean Science 3 (1), 43-53, 2007

DOE Ocean Carbon Sequestration Research Workshop 2005-May 26th thru 27th

2007 , The Trustees of Princeton University, 2007

A simple theory of the pycnocline and overturning revisited

2007 , GEOPHYSICAL MONOGRAPH-AMERICAN GEOPHYSICAL UNION 173, 19, 2007

The following article is part of the special section The Role of the Diatom Production and Si Flux and Burial in the Regulation of Global Cycles, which printed in December 2006.-GBIS90-Deep ocean

2007 , Global Biogeochemical Cycles 21 (1), 2007

Oceans-L11609-Impact of ocean color on the maintenance of the Pacific Cold Tongue (DOI 10.1029/2007GL030100)

2007 , Geophysical Research Letters 34 (11), 2007

A new mechanistically-based method for reducing uncertainty in detection of anthropogenic oceanic DIC using Repeat Hydrography

2006 , AGU Fall Meeting Abstracts 1, 04, 2006

The Southern Hemisphere westerlies in a warming world: Propping open the door to the deep ocean

2006 , Journal of Climate 19 (24), 6382-6390, 2006

The role of eddies in determining the structure and response of the wind-driven Southern Hemisphere overturning: Results from the Modeling Eddies in the Southern Ocean (MESO) project

2006 , Journal of Physical Oceanography 36 (12), 2232-2252, 2006

Diagnosing atmosphere‐ocean general circulation model errors relevant to the terrestrial biosphere using the Köppen climate classification

2006 , Geophysical research letters 33 (22), 2006

The once and future battles between thor and the midgard serpent: the southern hemisphere Westerlies and the Antarctic Circumpolar Current

2006 , Geochimica Et Cosmochimica Acta 70 (18), A547, 2006

How does ocean ventilation change under global warming?

2006 , Ocean Science Discussions 3 (4), 805-826, 2006

The southern ocean biogeochemical divide

2006 , Nature 441 (7096), 964-967, 2006

WATER MASS ANALYSIS AND REMINERALIZATION RATIOS Work in collaboration with: Andrew R. Jacobson (NOAA/ESRL/GMD/Colorado Univeristy) Robert M. Key (Princeton University)

2006 ,

GFDL's CM2 global coupled climate models. Part II: The baseline ocean simulation

2006 , Journal of climate 19 (5), 675-697, 2006

GFDL's CM2 global coupled climate models. Part I: Formulation and simulation characteristics

2006 , Journal of Climate 19 (5), 643-674, 2006

Central role of Southern Hemisphere winds and eddies in modulating the oceanic uptake of anthropogenic carbon

2006 , Geophysical research letters 33 (1), 2006

The Role of the Westerlies in Southern Ocean Environmental Change and Variability

2006 , EOS, Transactions, American Geophysical Union 87 (36), 2006

How the Antarctic controls atmospheric CO 2 and the Subantarctic global biological production. The importance of vertical mixing.

2006 , EOS, Transactions, American Geophysical Union 87 (36), 2006

Climate-L22701-Diagnosing atmosphere-ocean general circulation model errors relevant to the terrestrial biosphere using the Koppen climate classification (DOI 10.1029/2006GL028098)

2006 , Geophysical Research Letters 33 (22), 2006

Empirical and mechanistic models for the particle export ratio

2005 , Global Biogeochemical Cycles 19 (4), 2005

Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms

2005 , Nature 437 (7059), 681-686, 2005

Formulation of an ocean model for global climate simulations

2005 , Ocean Science 1 (1), 45-79, 2005

The energetics of ocean heat transport

2005 , Journal of climate 18 (14), 2604-2616, 2005

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