Centre and Geophysical Fluid Dynamics (2009)
Richard P. Allan, V. Ramaswamy
Laboratory (GFDL) climate models
Georgiy Stenchikov, Kevin Hamilton, Alan Robock, V. Ramaswamy, M. Daniel Schwarzkopf
SKYHI general circulation model with a realistic
response to aerosol optical depth and aerosol absorption (2009)
[1] Forcing by absorbing atmospheric black carbon (BC) tends to heat the atmosphere, cool the surface, and reduce the surface latent and sensible heat fluxes. BC aerosol can have a large impact on...
On shortwave radiation absorption in overcast atmospheres (2009)
Abstract. Using a numerical model of solar radiative transfer that is calibrated against benchmark computations, it is shown that atmospheric water vapor, together with the microphysical...
Timothy J. Garrett, Lynn M. Russell, V. Ramaswamy, Steven F. Maria, Barry J. Huebert
[1] Over the tropical North Atlantic Ocean in the summer, plumes of aerosol extend from Saharan Africa to the Caribbean. The microphysical and radiative evolution of such plumes is studied using a...
Vaishali Naik, Denise Mauzerall, Larry Horowitz, M. Daniel Schwarzkopf, V. Ramaswamy
radiative forcing due to changes in regional emissions of
Arctic Oscillation response to volcanic eruptions in the IPCC AR4 climate models (2009)
Georgiy Stenchikov, Kevin Hamilton, Ronald J. Stouffer, Alan Robock, V. Ramaswamy, Ben Santer, ...
[1] Stratospheric sulfate aerosol particles from strong volcanic eruptions produce significant transient cooling of the troposphere and warming of the lower stratosphere. The radiative impact of...
Fuyu Li, Paul Ginoux, V. Ramaswamy
[1] A model-based investigation of the transport, distribution and deposition of mineral dust in the Southern Hemisphere (SH) is performed by using the GFDL Atmospheric Model (AM2). The study...
radiation spectrum and surface temperature (2009)
[1] We analyze the seasonal variations of Outgoing Longwave Radiation (OLR) accompanying the variations in sea surface temperature (SST) from satellite observations and model simulations, focusing on...
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Yi Huang, V. Ramaswamy, Brian Soden
An investigation of the sensitivity of the clear-sky outgoing longwave radiation to atmospheric temperature and water vapor
changes in short-lived air pollutants (2009)
Hiram Levy Ii, M. Daniel Schwarzkopf, Larry Horowitz, V. Ramaswamy, K. L. Findell
[1] This study examines the impact of projected changes (A1B ‘‘marker’ ’ scenario) in emissions of four short-lived air pollutants (ozone, black carbon, organic carbon, and sulfate) on future...
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Xianglei Huang, V. Ramaswamy, M. Daniel Schwarzkopf
[1] The global and tropical means of clear-sky outgoing longwave radiation (hereinafter OLRc) simulated by the new GFDL atmospheric general circulation model, AM2, tend to be systematically lower...
Yi Huang, V. Ramaswamy, Xianglei Huang, Qiang Fu, Charles Bardeen
[1] The spectrally resolved infrared radiances observed by AIRS provide a strict and insightful test for general circulation models (GCMs). We compare the clear- and totalsky spectra simulated from...
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Vaishali Naik, Denise L. Mauzerall, Larry W. Horowitz, M. Daniel Schwarzkopf, V. Ramaswamy, D. L. Mauzerall, ...
On the sensitivity of radiative forcing from biomass burning aerosols and ozone to emission location
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Paul Ginoux, Larry W. Horowitz, V. Ramaswamy, Igor V. Geogdzhayev
coupled model CM2.1 for present climate
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Xianglei Huang, Wenze Yang, Norman G. Loeb, V. Ramaswamy
Spectrally resolved fluxes derived from collocated AIRS and CERES measurements and their application in model evaluation: Clear sky over the tropical oceans
Carynelisa Erlick, V. Ramaswamy, Lynn M. Russell
[1] In this study we perform an idealized experiment to investigate the effect of solar absorption in clouds on climate using a general circulation model with prescribed sea surface temperatures,...
The impact of aerosols on simulated ocean temperature and heat content in the 20th century (2009)
Thomas L. Delworth, V. Ramaswamy, Georgiy L. Stenchikov
[1] Observational analyses have documented increases in global ocean temperature, heat content, and sea level in the 20th century. Previous studies argued that the observed ocean warming is a...
Carynelisa Erlick, V. Ramaswamy
[1] Previous radiative-convective model studies of the radiative forcing due to absorbing aerosols such as soot and dust have revealed a strong dependence on the vertical distribution of the...
Note on the definition of clear sky in calculations of shortwave cloud forcing (2009)
Carynelisa Erlick, V. Ramaswamy
[1] An important item to distinguish in estimations of cloud forcing is the characteristics of the ‘‘clear sky.’ ’ In this study we investigate the influence of the composition of the clear...
C. A. Randles, L. M. Russell, V. Ramaswamy
[1] Scattering of incoming solar radiation by sea salt aerosol is strongly dependent on relative humidity (RH) since hygroscopic particles take up water at high RH. Organic compounds may constitute...
V. Ramaswamy, S. M. Freidenreich
The complete available spectral features (iine-by-line, or LBL) of the water vapor molecule in the solar spectrum and a precise treatment of particulate scattering are employed to obtain and analyze...
M. D. Schwarzkopf, V. Ramaswamy
[1] Monthly and seasonal stratospheric zonal-mean temperature trends arising from recent changes in stratospheric ozone and well-mixed greenhouse gases (WMGGs) are simulated using a general...
T. Kiehl, M. W. Moncrieff, J. J. Hack, W. Grabowski, V. Ramaswamy
Improved parameterization of clouds for general circulation models will require both ARM observations and the use of more detailed cloud models. We have adopted a parallel implementation approach to...
N. Pradeep, B. B. Shankaragowda, V. Ramaswamy
Breast cancer is caused due to uncontrolled growth of cells in the breast. Cancer has the potential to break through normal breast tissue barriers and spreads to other parts of the body. While cancer...
Rapid serodiagnosis of leptospirosis by latex agglutination test and flow-through assay (2008)
Senthilkumar, T.M.A., Subathra, M., Phil, M., Ramadass, P., Ramaswamy, V.
Purpose: Diagnosis of leptospirosis facilitates patient management and initiation of therapy. The microscopic agglutination test (MAT) is the serological test used in reference laboratories because...
Rapid serodiagnosis of leptospirosis by latex agglutination test and flow-through assay (2008)
Senthilkumar, T, Subathra, M, Phil, M, Ramadass, P, Ramaswamy, V
Kurian, S., Nath, B.N., Ramaswamy, V., Naman, D., Rao, T.G., KameshRaju, K.A., ...
Three sediment cores near the spreading axis in the Andaman backarc basin (ABB) were studied for bulk and clay mineralogy, major, trace and rare earth element (REE) geochemistry in bulk and three...
Nath, B.N., Borole, D.V., Aldahan, A., Patil, S.K., Possnert, G., ...
Isotopic (sup(210)Pb, sup(238)U-sup(230)Th, sup(10)Be), major and trace elements, and micromorphological and microchemical data, were used to identify recent (approx. 100 yrs) hydrothermal alteration...
Ramaswamy, V., Gaye, B., Shirodkar, P.V., Rao, P.S., Chivas, A.R., Wheeler, D., ...
Total organic carbon (TOC), total nitrogen (TN) and their delta sup(13) C and delta sup (15) N values were determined from 110 sediment samples from the Ayeyarwady (Irrawaddy) continental shelf,...
Bay of Bengal Process Studies (BOBPS) Final Report (2007)
PrasannaKumar, S., Sardessai, S., Ramaiah, N., Bhosle, N.B., Ramaswamy, V., Ramesh, R., ...
The Bay of Bengal Process Studies (BOBPS) was conceived in early 1997 as a sequel to the JGOFS (Joint Global Ocean Flux Study) India - Arabian Sea Process Study. Soon after the completion of the...
Source and dispersal of suspended sediment in the macro-tidal Gulf of Kachchh (2007)
Ramaswamy, V., Nath, B.N., Vethamony, P., Ilangovan, D.
The macro-tidal Gulf of Kachchh, covering nearly 7000 km sup(2), is located about 150 km south of the Indus River mouth. In spite of semi-arid climate and lack of major rivers flowing into it, the...
Solomon, S, Hegerl, GC, Heimann, M, Hewitson, B, Hoskins, BJ, Joos, F, ...
In the six years since the IPCe's Third Assessment Report (TAR), significant progress has been made in understanding past and recent climate change and in projecting future changes. These advances...
Summary for policymakers (2007)
Alley, RB, Hewitson, B, Hoskins, BJ, Joos, F, Jouzel, J, Kattsov, V, ...
The Working Group I contribution to the IPCC Fourth Assessment Report describes progress in understanding of the human and natural drivers of climate change, observed climate change, climate...
Summary for policymakers (2007)
Alley, RB, Hewitson, B, Hoskins, BJ, Joos, F, Jouzel, J, Kattsov, V, ...
The Working Group I contribution to the IPCC Fourth Assessment Report describes progress in understanding of the human and natural drivers of climate change, observed climate change, climate...
Summary for Policymakers (2007)
Alley, RB, Berntsen, T, Bindoff, NL, Chen, Z, Chidthaisong, A, Friedlingstein, P, ...
Solomon, S, Hegerl, GC, Heimann, M, Hewitson, B, Hoskins, BJ, Joos, F, ...
In the six years since the IPCe's Third Assessment Report (TAR), significant progress has been made in understanding past and recent climate change and in projecting future changes. These advances...
Solomon, S, Hegerl, GC, Heimann, M, Hewitson, B, Hoskins, BJ, Joos, F, ...
In the six years since the IPCe's Third Assessment Report (TAR), significant progress has been made in understanding past and recent climate change and in projecting future changes. These advances...
Summary for policymakers (2007)
Alley, RB, Hewitson, B, Hoskins, BJ, Joos, F, Jouzel, J, Kattsov, V, ...
The Working Group I contribution to the IPCC Fourth Assessment Report describes progress in understanding of the human and natural drivers of climate change, observed climate change, climate...
Effect of the temperature dependence of gas absorption in climate feedback (2007)
In the context of climate feedback associated with temperature change, there exist two potential mechanisms that affect the outgoing longwave radiation (OLR) and the downward longwave radiation...
A comparison has been made of sand, silt, and clay percentage of 118 samples from the Ayeyarwady continental shelf, northern Andaman Sea, measured by the sieve-laser diffraction technique and by...
Mass fluxes of diatom opal, planktonic foraminifera carbonate and coccolithophorid carbonate were measured with time-series sediment traps at six sites in the Arabian Sea, Bay of Bengal and...
Amplification of surface temperature trends and variability in the tropical atmosphere (2005)
Santer, B.D., Wigley, T.M.L., Mears, C., Wentz, F.J., Klein, S.A., Seidel, D.J., ...
Ramaswamy, V., Sarin, M.M., Rengarajan, R.
A drifting sediment trap was deployed and sup(234)Th activity in the water column was measured to calculate export flux of carbon at a time-series station in the northern Arabian Sea (lat. 21 degrees...
Radionuclide fluxes in the Arabian Sea: The role of particle composition (2005)
Scholten, J.C., Fietzke, J., Mangini, A., Stoffers, P., Rixen, T., Gaye-Haake, B., ...
The influence of the composition of the vertical particle flux on the removal of particle reactive natural radionuclides (sup(230)Th and sup(231)Pa) from the water column to the sediments is...
Gaye-Haake, G., Lahajnar, N., Emeis, K.-Ch., Unger, D., Rixen, T., Suthhof, A., ...
Delta sup(15)N values in modern sediments of the northern Indian Ocean range from less than 4 ppt in the northern Bay of Bengal to greater than 11 ppt in the central Arabian Sea due to the strong...
Sediment texture, distribution and transport on the Ayeyarwady continental shelf, Andaman Sea (2005)
Rao, P.S., Ramaswamy, V., Thwin, S.
The Ayeyarwady continental shelf is a complex sedimentary system characterized by large sediment influx (N360 million ton/yr), a wide shelf (N170 km), a strong tidal regime (7 m maximum tidal range),...
T. R. Knutson, T. L. Delworth, K. W. Dixon, I. M. Held, J. Lu, V. Ramaswamy, ...
Historical climate simulations of the period 1861–2000 using two new Geophysical Fluid Dynamics Laboratory (GFDL) global climate models (CM2.0 and CM2.1) are compared with observed surface...
Direct radiative forcing of anthropogenic organic aerosol (2005)
Yi Ming, V. Ramaswamy, Paul A. Ginoux, Larry H. Horowitz
[1] This study simulates the direct radiative forcing of organic aerosol using the GFDL AM2 GCM. The aerosol climatology is provided by the MOZART chemical transport model (CTM). The approach to...
Yi Ming, V. Ramaswamy, Leo J. Donner, Stephen A. Klein, Paul A. Ginoux, ...
To model aerosol–cloud interactions in general circulation models (GCMs), a prognostic cloud scheme of cloud liquid water and amount is expanded to include droplet number concentration (Nd) in a...
Randles, C A, Russell, L M, Ramaswamy, V
Scattering of incoming solar radiation by sea salt aerosol is strongly dependent on relative humidity ( RH) since hygroscopic particles take up water at high RH. Organic compounds may constitute up...
Ramaswamy, V., Rao, P.S., Rao, K.H., Thwin, S., Rao, N.S., Raiker, V.
Surface and water column profiles of suspended matter collected during April-May 2002, and satellite images were used to study factors influencing suspended sediment concentrations (SSCs) and...
Yi Ming, V. Ramaswamy, Leo J. Donner
A new parameterization is proposed to link the droplet number concentration to the size distribution and chemical composition of aerosol and updraft velocity. Except for an empirical assumption of...
VERTICAL PROFILES OF TEMPERATURE TRENDS (2004)
W. Thorne, Thomas R. Karl, Holly Coleman, Chris K. Folland, Bill Murray, David E. Parker, ...
This workshop aimed to further our understanding of observed changes in upper-air temperatures and their relationship to observed surface and boundary layer climate evolution by considering where...
Polar Stratospheric Ozone (2003)
Newman, P., Pyle, J.A., Austin, J., Braathen, G., Canzini, P., Carslaw, K., ...
A Comparison of Model Simulated Trends in Stratospheric Temperatures (2003)
Shine, K.P., Bourqui, M.S., Forster, P.M. De, Hare, S.H.E., Langematz, U., Braesicke, P., ...
Carbon budget in the eastern and central Arabian Sea: An Indian JGOFS synthesis (2003)
Swathi, P.S., DileepKumar, M., PrasannaKumar, S., Bhattathiri, P.M.A., Madhupratap, M., ...
The carbon budget for the eastern and central Arabian Sea was constructed using results from the Modular Ocean Model and biogeochemical data collected largely under the Indian Joint Global Ocean Flux...
Affiliation Noaa/gfdl, New Jersey, Thomas L. Delworth, Keith W. Dixon, Leo J. Donner, Stuart M. Freidenreich, ...
JDSGFJDSGFK JIM ANGELL’S CONTRIBUTIONS TO METEOROLOGY (2003)
Dian Seidel, James Angell, Alan Robock, Bruce Hicks, Karin Labitzke, John Lanzante, ...
pioneering contributions to meteorology, especially to our understanding of climate variability, stratospheric processes, and the ozone layer. On 4 November 2003, many colleagues and friends gathered...
A general circulation model study of the global carbonaceous aerosol (2002)
W. F. Cooke, V. Ramaswamy, P. Kasibhatla
distribution
[1] We compare European Centre for Medium-Range Weather Forecasts 15-year (2002)
Richard P. Allan, A. Slingo, Hadley Centre, Met Office, V. Ramaswamy
reanalysis (ERA-15) moisture over the tropical oceans with satellite observations and the
Summary for Policymakers. (2001)
Houghton, J. T., Albritton, D. L., Allen, M. R., Baede, A. P. M., Church, J. A., Cubasch, U., ...
Solid state 13C-NMR spectroscopy and XRD studies of commercial and pyrolytic carbon blacks (2000)
Darmstadt, H., Roy, C., Kaliaguine, S., Xu, G., Auger, M., Tuel, A., ...
Sarin, M.M., Krishnaswami, S., Dalai, T.K., Ramaswamy, V., Ittekkot, V.
A two-year (1990-1991) collection of sediment trap samples from three locations in the Bay of Bengal was analyzed for Al, Ca and U- and Th-series nuclides to obtain their annual fluxes and pattern of...
Seasonal and spatial variations in settling manganese fluxes in the northern Arabian Sea (1999)
Nair, T.M.B., Ramaswamy, V., Shankar, R., Ittekkot, V.
Particulate manganese (Mn) fluxes measured with six time series sediment traps showed that the annual settling fluxes were 3-6 times higher in the west compared to those in the east and central...
Factors controlling vertical fluxes of prrticles in the Arabian Sea (1999)
Nair, T.M.B., Ramaswamy, V., Parthiban, G., Shankar, R.
Particle fluxes were measured using six time-series sediment traps at three sites in the western (16 degrees 20'N; 60 degrees 30'E), central (14 degrees 31'N; 64 degrees 46'E) and eastern (15 degrees...
M. Daniel Schwarzkopf, V. Ramaswamy
Abstract. The simplified exchange approximation (SEA) method for calculation of infrared radiative transfer, used for general circulation model (GCM) climate simulations at the Geophysical Fluid...
Hydrogen Sulphide Resistance of High Sulphur Microalloyed Steels. (1998)
Ravi, K., Ramaswamy, V., Namboodhiri, T. K. G.
Sulfide stress cracking (SCC) and hydrogen-induced blister cracking (HIBC) studies were conducted on a set of seven microalloyed steels to determine the effects of alloy additions and sulfide shape...
Recent Studies in Thermo-Mechanical Processing of Microalloyed Steels. (1998)
Ramaswamy, V., Datta, R., Chaudhuri, S. K., Mishra, S.
Development of high strength steel constitutes a major r&d programme at the steel authority of india limited (sail). the first phase of activity, involving controlled rolling (1975-80) resulted...
Lithogenic fluxes in the Bay of Bengal measured by sediment traps (1997)
Ramaswamy, V., VijayKumar, B., Parthiban, G., Ittekkot, V., Nair, R.R.
sup(234) Th scavenging and particle export fluxes from the upper 100 m of the Arabian Sea (1996)
Sarin, M.M., Rengarajan, R., Ramaswamy, V.
We have determined the particle scavenging rates, export fluxes of sup(234) Th and settling particles from the upper 100 m of the Arabian Sea as a part of the JGOFS (India) Programme. The spatial and...
A line-by-line investigation of solar radiative effects in vertically inhomogeneous low clouds
A rehabilitated submerged village in Karnataka
Lithogenic fluxes to the northern Indian Ocean - An overview (1993)
Lithogenic fluxes to the northern Indian Ocean, measurEd. by time-series sediment traps, exhibit a strong seasonality with the bulk of the material (40 to 80 %) being deposited during the southwest...
Seasonality and interannual variability of particle-fluxes to the deep Arabian Sea (1993)
Haake, B., Ittekkot, V., Rixen, T., Ramaswamy, V., Nair, R.R., Curry, W.B.
Long-term sediment trap studies have been carried out since 1986 at three locations in the western, central and eastern Arabian Sea. Total and bulk component fluxes measured for 3 years at the...
Organic carbon removal in the sea: the continental connection (1992)
Ittekkot, V., Haake, B., Bartsch, M., Nair, R.R., Ramaswamy, V.
Time series sediment traps have been deployed since May 1986 in the Arabian Sea and since October 1987 in the Bay of Bengal. The results of one and a half years from the western, central, and eastern...
Particle fluxes in the Bay of Bengal measurEd. by sediment traps (1992)
Particle fluxes were measured between October, 1987 and March, 1988 using six automated time series sediment traps at three locations in the northern, central and southern Bay of Bengal. Particle...
Fluxes of amino acids and hexosamines to the deep Arabian sea (1992)
Haake, B., Ittekkot, V., Ramaswamy, V., Nair, R.R., Honjo, S.
Results of organic carbon, total nitrogen, amino acid and hexosamine of samples collected during time-series sediment trap in investigations in the Arabian Sea are presented. Samples were taken over...
Monsoons are familiar elements of tropical life, bringing rain to the crops that feed millions. The effects do not stop there, in the Arabian Sea, the twice-yearly monsoon winds enrich the fishing...
Development of Rolling Textures in an Austenitic Stainless Steel (1992)
C. D. Singh, V. Ramaswamy, C. Suryanarayana
Three dimensional texture analysis by means of orientation distribution functions (ODF) was used to examine the texture development during rolling at 473 K in an austenitic stainless steel. With the...
Enhanced particle fluxes in Bay of Bengal inducEd. by injection of freshwater (1991)
Ittekkot, V., Nair, R.R., Honjo, S., Ramaswamy, V., Bartsch, M., Manganini, S.J., ...
The melting of ice sheets during deglaciation results in the injection of large amounts of fresh water into the oceans. To investigate how such injections might influence particle fluxes in the...
Lithogenic fluxes to the deep Arabian Sea measurEd. by sediment traps (1991)
Ramaswamy, V., Nair, R.R., Manganini, S.J., Haake, B., Ittekkot, V.
Particle fluxes measured continuously for one year at three locations in the Arabian Sea using time-series sediment traps show that lithogenic sedimentation processes are strongly coupled to...
Texture Evolution in a Hot Rolled Austenitic Stainless Steel (1991)
C. D. Singh, V. Ramaswamy, C. Suryanarayana
The ODF analysis of the surface texture of the hot band of austenitic stainless steel reveals the presence of orientations of shear texture. These orientation elements are mainly distributed along...
Wedel, M., De Sarbo, W.S., Bult, J.R., Ramaswamy, V.
regression analysis ; economic models
ON A NEW CLASS OF LOAD BALANCING NETWORK PROTOCOLS
S. EIDENBENZ, A. Ã HANSSON, V. RAMASWAMY, C. M. REIDYS
In this paper we study a new class of generic, parametrized, locally load-sensing (LLS) network-routing protocols over simple graphs, Y. These protocols are Y-"local" in the sense that they transmit...