Samar Khatiwala
111 Comer Geochemistry Building
Lamont Doherty Earth Observatory
Columbia University
Palisades, NY 10964
Email: spk@ldeo.columbia.edu
Phone: 845-365-8454
Fax: 845-365-8155
Curriculum Vitae
CV
(4/1/2012)
Publications
- H. D. Graven,
N. Gruber, R. Key, S. Khatiwala, and X. Giraud.
Changing controls on oceanic radiocarbon: New insights on shallow-to-deep
ocean exchange and anthropogenic co uptake.
J. Geophys. Res. (in revision), 2012.
- S. Khatiwala, F. Primeau, and M. Holzer.
Ventilation of the deep ocean constrained with tracer observations and
implications for radiocarbon estimates of ideal mean age.
Earth and Planet. Sci. Lett., doi: 10.1016/j.epsl.2012.01.038,
2012.
(PDF)
- S. Khatiwala, T. Tanhua, S. Mikaloff Fletcher,
M. Gerber, S. C. Doney, H. D. Graven, N. Gruber, G. A. McKinley, A. Murata,
A. F. Ríos, C. L. Sabine, and J. L Sarmientor.
Global ocean storage of anthropogenic carbon.
Biogeoscience (submitted), 2012.
- I. Kriest,
A. Oschlies, and S. Khatiwala.
Sensitivity analysis of simple global marine biogeochemical models.
Glob. Biogeochem. Cy., doi: 10.1029/2011GB004072, 2012.
(PDF)
- C. L. Sabine,
R. A. Feely, R. Wanninkhof, T. Takahashi, S. Khatiwala, and G.-H. Park.
The global ocean carbon cycle [in ``State of the Climate in 2011''].
BAMS (submitted), 2012.
- D. Wang,
S. Khatiwala, and M. A. Cane.
Present and future source regions and transit time distributions of Pacific
equatorial thermocline waters.
JGR (submitted), 2012.
- S. Wang, J. K.
Moore, F. Primeau, and S. Khatiwala.
Simulation of anthropogenic CO2 uptake in the CCSM3.1 ocean
circulation-biogeochemical model: comparison with data-based estimates.
Biogeosciences, 9:1321–1336, 2012.
(PDF)
- D. P.
Nicholson, S. R. Emerson, S. Khatiwala, and R. C. Hamme.
An inverse approach to estimate bubble-mediated air-sea gas flux from inert
gas measurements.
In S. Komori, W. McGillis, and R. Kurose, editors, The 6th International
Symposium on Gas Transfer at Water Surfaces, pages 223–237. Kyoto
University Press, 2011.
(PDF)
- C. L. Sabine,
R. A. Feely, R. Wanninkhof, T. Takahashi, S. Khatiwala, and G.-H. Park.
The global ocean carbon cycle [in ``State of the Climate in 2010''].
Bull. Amer. Meteor. Soc., 92 (6):S100–S105, 2011.
(PDF)
- C. A. Carlson,
D. A. Hansell, N. B. Nelson, D. A. Siegel, W. M. Smethie, S. Khatiwala, M. M.
Meyers, and E. Halewood.
Dissolved organic carbon export and subsequent remineralization in the
mesopelagic and bathypelagic realms of the North Atlantic basin.
Deep-Sea Res. II, 57 (doi:10.1016/j.dsr2.2010.02.013), 2010.
(PDF)
- M. Holzer,
F. Primeau, W. Smethie, and S. Khatiwala.
Where and how long ago was water in the western North Atlantic ventilated?
Maximum-entropy inversions of bottle data from WOCE line A20.
J. Geophys. Res., 115 (doi:10.1029/2009JC005750), 2010.
(PDF)
- I. Kriest,
S. Khatiwala, and A. Oschlies.
Towards an assessment of simple global marine biogeochemical models of
different complexity.
Prog. Oceanogr., 86 (doi:10.1016/j.pocean.2010.05.002), 2010.
(PDF)
- C. L. Sabine,
R. A. Feely, R. Wanninkhof, T. Takahashi, S. Khatiwala, and G.-H. Park.
The global ocean carbon cycle [in ``State of the Climate in 2009''].
Bull. Amer. Meteor. Soc., 91 (6):S71–S75, 2010.
(PDF)
- S. Khatiwala,
F. Primeau, and T. Hall.
Reconstruction of the history of
anthropogenic CO2
concentrations in the ocean.
Nature, 462 (doi:
10.1038/nature08526), 2009.
(link;
supplementary material: link;
see also related 'Making the Paper' story
in the same issue: link.)
See
also the Columbia press
release,
and media coverage in The
New
York Times, TIME
magazine, National
Geographic magazine, NPR,
VOA,
and German
public
radio.
- K. Jones,
S. Khatiwala, T. van de Flierdt, S. Hemming, and S. Goldstein.
Modeling the distribution of Nd isotopes in the oceans using an ocean general
circulation model.
Earth and Planet. Sci. Lett., 272:610–619, 2008.
(PDF)
- S. Khatiwala.
Fast spin up of ocean biogeochemical models using matrix-free Newton-Krylov.
Ocean Modell., 23:121–129, 2008.
(PDF)
- T. Merlis and S. Khatiwala.
Fast dynamical spin-up of ocean general circulation models using Newton-Krylov
methods.
Ocean Modell., 21:97–105, 2008.
(PDF)
- M. Siddall,
S. Khatiwala, T. van de Flierdt, K. Jones, S. Goldstein, S. Hemming, and
R. F. Anderson.
Towards explaining the Nd paradox using reversible scavenging in an ocean
general circulation model.
Earth and Planet. Sci. Lett., 274:448–461, 2008.
(PDF)
- S. Khatiwala.
A computational framework for simulation of biogeochemical tracers in the
ocean.
Glob. Biogeochem. Cy., 21 (doi: 10.1029/2007GB002923), 2007.
(PDF)
- N. B. Nelson, D. A
Siegel, C. A. Carlson, C. Swan, W. M. Smethie, and S. Khatiwala.
Hydrography of chromophoric dissolved organic matter in the North Atlantic.
Deep Sea Res. I, 54:710–731, 2007.
(PDF)
- F. Terenzi,
T. M. Hall, S. Khatiwala, C. B. Rodehacke, and D. A. LeBel.
Uptake of natural and anthropogenic carbon by the Labrador Sea.
Geophys. Res. Lett., 34 (doi: 10.1029/2006GL028543), 2007.
(PDF)
- S. Khatiwala, M. Visbeck, and M. Cane.
Accelerated simulation of passive tracers in ocean circulation models.
Ocean Modell., 9:51–69, 2005.
(PDF)
- T. M. Hall, D. W.
Waugh, T. W. N. Haine, P. E. Robbins, and S. Khatiwala.
Estimates of anthropogenic carbon in the Indian Ocean with allowance for
mixing and time-varying air-sea CO2 disequilibrium.
Glob. Biogeochem. Cy., 18 (doi: 10.1029/2003GB002120), 2004.
(PDF)
- S. Khatiwala.
Generation of internal tides in an ocean of finite depth: analytical and
numerical calculations.
Deep-Sea Res. I, 50:3–21, 2003.
(PDF)
- S. Khatiwala, P. Schlosser, and M. Visbeck.
Rates and mechanisms of water mass transformation in the Labrador Sea as
inferred from tracer observations.
J. Phys. Oceanogr., 32:666–686, 2002.
(PDF)
- P. Schlosser, B. Ekwurzel, S. Khatiwala, R. Newton,
W. Maslowski, and S. Pfirman.
Correction to ``Decrease of river runoff in the upper waters of the Eurasian
Basin, Arctic Ocean, between 1991 and 1996: Evidence from δ18O
data''.
Geophys. Res. Lett., 29 (doi:10.1029/2002GL015698), 2002.
(PDF)
- P. Schlosser, R. Newton, B. Ekwurzel, S. Khatiwala,
R. Mortlock, and R. Fairbanks.
Decrease of river runoff in the upper waters of the Eurasian Basin, Arctic
Ocean, between 1991 and 1996: Evidence from δ18O data.
Geophys. Res. Lett., 29 (doi: 10.1029/2001GL013135), 2002.
(PDF)
- N. Schörghofer, O. Aharonson, and S. Khatiwala.
Slope streaks on Mars: Correlations with surface properties and the potential
role of water.
Geophys. Res. Lett., 29 (doi: 10.1029/2002GL015889), 2002.
(PDF)
- S. Khatiwala, B. E. Shaw, and M. A. Cane.
Enhanced sensitivity of persistent events to weak forcing in dynamical and
stochastic systems: Implications for climate change.
Geophys. Res. Lett., 28:2633–2636, 2001.
(PDF)
- S. Khatiwala, M. Visbeck, and P. Schlosser.
Age tracers in an ocean GCM.
Deep-Sea Res. I, 48:1423–1441, 2001.
(PDF)
- S. Khatiwala and M. Visbeck.
An estimate of the eddy-induced circulation in the Labrador Sea.
Geophys. Res. Lett., 27:2277–2280, 2000.
(PDF)
- P. Schlosser, B. Ekwurzel, S. Khatiwala, R. Newton,
W. Maslowski, and S. Pfirman.
Tracer studies of the Arctic freshwater budget.
In E. L. Lewis, editor, Freshwater balance of the Arctic Ocean,
NATO Science Series, pages 453–478. Kluwer Academic Publishers, 2000.
- S. Khatiwala, R. G. Fairbanks, and R. Houghton.
Freshwater sources to the coastal ocean off northeastern North America:
Evidence from H218O/H216O.
J. Geophys. Res., 104:18241–18255, 1999.
(PDF)
- P. Schlosser, R. Bayer, G. Bonisch, L. Cooper, B. Ekwurzel,
W. J. Jenkins, S. Khatiwala, S. Pfirman, and W. M. Smethie.
Pathways and mean residence times of dissolved pollutants in the ocean derived
from transient tracers and stable isotopes.
Science of the Total Environment, 238:15–30, 1999.
- R. Weppernig, P. Schlosser, S. Khatiwala, and R. G.
Fairbanks.
Isotope data from Ice Station Weddell: Implications for deep water formation
in the Weddell Sea.
J. Geophys. Res., 101:25723–25739, 1996.
(PDF)
Research
Anthropogenic
carbon
in the ocean
Ocean
transport
time-scales
Transport
Matrix
Method
Fast
spinup
of ocean biogeochemical models using
matrix-free Newton-Krylov
Transit-Time Distributions (coming soon; in
the mean
time see here: Matlab
TTD
scripts )
Iterative methods for fast dynamical spinup
of ocean
general circulation models (coming soon)
Eddies in the Southern Ocean and
anthropogenic carbon
uptake (coming soon)
Teaching
S3101
Linear
Algebra
G9810
Waves
G4210
Geophysical
Fluid Dynamics (2004)
G4210
Geophysical
Fluid Dynamics (2005)
G9802
Geochemistry
Seminar on Modeling of Paleoceanographic
Proxies (2006)
V2100
Climate
System (2007) (email
me for access to my lecture
slides)
G4210
Geophysical
Fluid Dynamics (2008)
Numerical modeling of the ocean and
atmosphere (coming
soon)
Programming
Matlab
code
My
fortran
I/O
library
Miscellaneous
PETSc
Utilities
|
|