Mark A. Altabet

School for Marine Science and Technology, University of Massachusetts, Dartmouth, 706 S. Rodney French Blvd., New Bedford, MA 0744-1221
508-999-8622, email, web

My research interests focuses on understanding the operation of major marine biogeochemical cycles, as they operated in the past as well as at present, using natural variations in isotopic ratio (e.g. 15N/14N, 13C/12C, and 18O/16O). Emphasis is on  the global N cycle and its interactions with climate change, atmospheric CO2 concentration, and coastal eutrophication.

An example of on-going work is our NSF-ESH funded study of the Peru Margin (collaborative with Tim Herbert at Brown U.).  In the Peru margin upwelling/denitrification zone, biogeochemical cycles are extraordinarily attuned to rapid changes in climate on decadal to orbital scales. The Peru margin is tightly coupled to the globe's largest tropical heat engine, the equatorial Pacific with high sensitivity to ENSO with respect to productivity and denitrification.  We have successfully applied alkenone 14C as a novel dating technique to overcome the lack of carbonate in high accumulation margin sediments.  We have used sediment d15N to both correlate core chronologies and as a record for changes in denitrification that shows a very early maximum upon deglaciation as well as novel late Holocene excursions. Other proxies for productivity, suboxia, SST, and lithogenic source have also been measured to understand the forcings for observed changes in denitrification intensity.  The early deglacial rise appears to be forced remotely, perhaps through changes in SAMW ventilation.

Sigman, D.M., M. A. Altabet, D. C. McCorkle, R. Francois, G. Fisher. The d15N of nitrate in the southern ocean: II. Nitrogen cycling and circulation in the ocean interior. J. Geophys. Res. 105, 19599-19614. 2000

Altabet, M.A. Nitrogen isotopic evidence for micronutrient control of fractional NO3-utilization in the Equatorial Pacific. Limnol. Oceanogr. 46, 368-380. 2001

Altabet, M.A. and R. Francois  The nitrogen isotope biogeochemistry of the Antarctic polar frontal zone along 170°W. Deep Sea Research Part II, 48, 4247-4273, 2001

Altabet, M.A., M.J. Higginson, D.M. Murray The effect of millennial-scale changes in Arabian Sea denitrification on atmospheric CO2.Nature, 415, 15-162, 2002

Higginson, M.J., J.R. Maxwell, and Mark A. Altabet. (2003) Nitrogen isotope and chlorin paleoproductivity records from the northern South China Sea: Remote vs. local forcing of millennial-scale and orbital-scale variability. Marine Geology, 201, 223-250.

Higginson, MJ , MA Altabet, DW Murray, RW Murray, and TD Herbert (2004) Geochemical Evidence for Abrupt Changes in Relative Strength of the Arabian Monsoons During a Stadial/Interstadial Climate Transition. Geochim. Cosmochim. Acta 68, 3807-3826, doi:10.1016/j.gca.2004.03.015

Coale, KH, KS Johnson, FP Chavez, KO Buesseler, RT Barber, MA Brzezinski, WP Cochlan, FJ Millero, PG. Falkowski, JE. Bauer, RH Wanninkhof, RM Kudela, MA Altabet, BE Hales, T Takahashi, MR Landry, RR Bidigare, Z Chase, PG Strutton, GE Friederich, MY Gorbunov, VP Lance, AK Hilting, MR Hiscock, M Demerest, WT Hiscock, KA Sullivan, SJ Tanner, RM Gordon, CL Hunter, VA Elrod, SE Fitzwater, S Tozzi, M Koblizek, AE Roberts, J Herndon, D Timothy, SL Brown, KE Selph, CC Sheridan, BS Twining and ZI Johnson (2004) Southern Ocean Iron Enrichment Experiment  (SOFeX): Iron, Silicon and Light Interactions in Antarctic Waters. Science 304, 408-414,DOI: 10.1126/science.1089778

Higginson, M. J., and Altabet, M. A. (2004) Initial test of the silicic acid leakage hypothesis using sedimentary biomarkers. Geophys. Res. Lett. 31, L18303, doi:10.1029/2004GL020511

Higginson, M.J. , M.A. Altabet, L. Wincze, T.D. Herbert, and D.W. Murray (2004) A solar (irradiance) trigger for millennial-scale abrupt changes in the southwest monsoon? Paleoceanogr. 19; PA3015, doi:10.1029/2004PA001031

McIlvin, M. R. and M. A. Altabet (2005) Chemical conversion of nitrate and nitrite to nitrous oxide for nitrogen and oxygen isotopic analysis in freshwater and seawater. Anal. Chem. 77, 5589-5595 http://dx.doi.org/10.1021/ac050528s

Liu, Z., M. A. Altabet, and T. D. Herbert (2005), Glacial-interglacial modulation of eastern tropical North Pacific denitrification over the last 1.8-Myr, Geophys. Res. Lett., 32, L23607, doi:10.1029/2005GL024439.

Altabet, M.A. (2005) Isotopic tracers of the marine nitrogen cycle, In: Marine Organic Matter: Chemical and Biological Markers edited by J. Volkman, vol. 2 of  "The Handbook of Environmental Chemistry", Editor-in-Chief: O. Hutzinger, DOI: 10.1007/698_2_008.

David M. Anderson

NOAA Paleoclimatology Program, 325 Broadway, E/CC23, Boulder, CO, 80305
303-497-6237, email, web

I head the Paleoclimatology Branch of NOAA's National Climatic Data Center and the World Data Center for Paleoclimatology (www.ncdc.noaa.gov/paleo), and am an Associate Professor Adjoint at the University of Colorado. Since 1992 I have dedicated much of my energy to the development of a public archive of paleo data, with two goals. My first goal is to help our field increase its impact and relevance to global climate change research by producing organized, widely accessible data sets. My second goal is to help you benefit from accessible data sets that can be re-calibrated, analyzed, and synthesized (recalibrating age models and C14 ages being one example), enabling you to improving the quality and impact of the paleoclimate record.

My research interests lie in the reconstruction of ENSO, the monsoons, and other aspects of ocean-atmosphere interaction. Our research has revealed long-term trends, as well as abrupt changes in the Asian monsoon that are likely to persist in the future. We were the first to identify the link in the paleo record between monsoon strength and recent warming, and we have illuminated in paleo records the monsoon-ENSO link observed in the instrumental record. I am also interested the ocean's role in changing atmospheric carbon dioxide. Together with David Archer, our research has shown how the carbonate ion concentration in the deep sea changes through glacial cycles. Our research shows how carbonate buffering and carbonate compensation maintain a constant level of carbonate ion (and total carbon dioxide) in the deep sea, implicating changes in upper ocean (<1000 m) circulation and the biological pump in controlling atmospheric carbon dioxide over thousands of years.

Gupta, A. K., Das, M., and D. M. Anderson, 2005. Solar influence on the Indian summer monsoon during the Holocene, Geophysical Research Letters, 32(7), L17703, 10.1029/2005GL022685.

Gupta, A. K., Anderson, D. M., and J. T. Overpeck, 2003. Abrupt Changes in the Holocene Asian Southwest Monsoon and Their Links to the North Atlantic. Nature, 421:354-357.

Moy, C. M., Seltzer, G. O., Rodbell, D. T., and D. M. Anderson, 2002. Oscillation in ENSO Activity at Millennial Time Scales During the Holocene. Nature, 420:162-165.

Anderson, D. M., and Overpeck, J. T., and A. K. Gupta, 2002. Increase in the Asian SW Monsoon During the Past Four Centuries. Science, 297:596-599.

Anderson, D. M., and Archer, D. 2002. Glacial-intergacial stability of ocean pH inferred from foraminifer dissolution rates. Nature, 416:70-73.

Anthony J. Broccoli

Associate Professor, Department of Environmental Sciences, Cook College, Rutgers University, 14 College Farm Road, New Brunswick, NJ 08901-8551
732-932-9817, email, web

My research interest is climate modeling, with particular emphasis on the simulation of past climates and climate change. Climate models are powerful tools for improving our fundamental understanding of the climate system and predicting its future behavior. The value of climate models depends on their credibility, so careful comparison with the observed climate record is essential. My research involves the design and analysis of climate model experiments intended to facilitate such comparisons, and thereby add to our understanding of fundamental climate processes.

The instrumental record of global climate is no more than 150 years long, so there are limitations in focusing solely on this relatively recent period. Changes in climate forcing during this time have been modest, particularly when compared to projected 21st century changes due to human activities. The instrumental climate record is also too short to unambiguously identify low-frequency climate variability. To address both of these limitations, much of my research involves comparisons of climate model simulations with the paleoclimate record, which contains abundant evidence of large changes in climate in the more distant past. My research has involved a broad range of topics including the climate of the last ice age, the effects of mountains on regional aridity, the response of climate to changes in the earth's orbit, and the response of the tropical circulation to high-latitude climate forcing.

Some of my research has also focused on the analysis of simulations of climate variations during the period of instrumental records, when climate data are most abundant and comprehensive. For instance, I have attempted to identify the roles of natural and anthropogenic forcing in the changes in climate that have been observed during the 20th century. Thus my efforts to compare climate model simulations with the climate record proceed from two complementary approaches: modeling the distant past, in which climate changes are relatively large but data are uncertain, and modeling the more recent era, in which climate changes are more modest but more precise data are available. Over the next ten to twenty years, distinctions between these two approaches will diminish as more sophisticated methods are used to extend the climate record backward in time using paleoclimatic and paleoceanographic data.

Hewitt, C. D., A. J. Broccoli, M. Crucifix, J. M. Gregory, J. F. B. Mitchell, R. J. Stouffer, 2006: The effect of a large freshwater perturbation on the glacial North Atlantic Ocean using a coupled general circulation model. J. Climate, in press.

Broccoli, A. J., K. A. Dahl, and R. J. Stouffer, 2006: The Response of the ITCZ to Northern Hemisphere cooling. Geophys. Res. Lett., 33, L01702, doi:10.1029/2005GL024546.

Hall A., A. C. Clement, A. J. Broccoli, C. S. Jackson, 2005: The importance of atmospheric dynamics in the northern hemisphere wintertime climate response to changes in earth's orbit, J. Climate, 18, 1315-1325, DOI 10.1175/JCLI3327.1.

Dahl, K. A., A. J. Broccoli, and R. J. Stouffer, 2005: Assessing the role of North Atlantic freshwater forcing in millennial scale climate variability: A tropical Atlantic perspective, Clim. Dynamics, 24, 325-346.

Rosenthal, Y., and A. J. Broccoli, 2004: In search of paleo-ENSO, Science, 304, 219-221.

Clement, A. C., A. Hall, and A. J. Broccoli, 2004: The importance of precessional signals in the tropical climate, Climate Dynamics, 22, 327-341, DOI: 10.1007/s00382-003-0375-8.

Jackson, C. S., and A. J. Broccoli, 2003: Orbital forcing of Arctic climate: Mechanisms of climate response and implications for continental glaciation, Climate Dynamics, 21, 539-557, DOI 10.1007/s00382-003-0351-3.

Hewitt, C. D., R. J. Stouffer, A. J. Broccoli, J. F. B. Mitchell, and P. J. Valdes, 2003: The effect of ocean dynamics in a coupled GCM simulation of the Last Glacial Maximum. Climate Dynamics, 20, 203-218. DOI: 10.1007/s00382-002-0272-6.

Andreasen, D. H., A. C. Ravelo, and A. J. Broccoli, 2001: Remote forcing at the Last Glacial Maximum in the tropical Pacific Ocean. Journal of Geophysical Research, 106(C1), 879-897.

Hewitt, C. D., A. J. Broccoli, J. F. B. Mitchell, and R. J. Stouffer, 2001: A coupled model study of the last glacial maximum: Was part of the North Atlantic relatively warm? Geophysical Research Letters, 28(8), 1571-1574.

Broccoli, A. J., 2000: Tropical cooling at the Last Glacial Maximum: An atmosphere-mixed layer ocean model simulation. Journal of Climate, 13(5), 951-976.

Amy C. Clement

RSMAS/MPO, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149
305-421-4846, email, web

My research interests focus on some fundamental questions about the behavior of the climate system. How sensitive is the Earth's climate to external forcing? Is abrupt change a characteristic of the climate? What are the mechanisms of climate change? Several of these questions arise out of the paleoclimate record. In addition to observed major swings in global ice volume over the past 600,000 years (the so-called "Ice Ages"), there are superimposed abrupt changes that can happen on the order of decades. The paleoclimate record gives us an idea of the dramatic range of climate behavior that is "natural." It is essential to understand the mechanisms behind these changes in order to put our present climate into the proper context, and to understand and predict how the climate may change in the future as anthropogenic greenhouse gases increase.

To address these questions, I use mathematical models of the climate. These range in complexity from one-dimensional approximations of the climate to global, three-dimensional models (general circulation models- GCMs). My focus has generally been on the tropical coupled ocean-atmosphere system, and in particular on the El Niño/Southern Oscillation (ENSO). As the largest mode of variability in the modern climate, understanding the whys and hows of past changes in (ENSO) are essential in answering fundamental questions about the behavior of the climate system, and are highly relevant for addressing the problem of how climate may change in the future.

Clement, A.C. and B. Soden, 2005: The Sensitivity of the Tropical-mean Radiation Budget. J. Climate, Vol. 18, No. 16, pages 2909-2923.

Herweijer, C., R. Seager, M. Winton and A. Clement, 2005: Why ocean heat transport warms the global mean climate. Tellus A, 57 (4), 662-675.

Hall, A. , A. Clement, D. W. J. Thompson, A. J. Broccoli and C. Jackson. 2005: The Importance of Atmospheric Dynamics in the Northern Hemisphere Wintertime Climate Response to Changes in the Earth's Orbit. Journal of Climate: Vol. 18, No. 9, pp. 1315-1325.

Michael E. Mann, Mark A. Cane, Stephen E. Zebiak and Amy Clement. 2005: Volcanic and Solar Forcing of the Tropical Pacific over the Past 1000 Years. Journal of Climate: Vol. 18, No. 3, pp. 447-456.

Mitas, C. M. and A Clement, 2005: Has the Hadley cell been strengthening in recent decades?Geophys. Res. Letts., Vol. 32, No. 3, doi 10.1029/2004GL021765.

Rosanne D. D'Arrigo

Senior Research Scientist, Tree-Ring Laboratory, Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964
845-365-8517, email, web

My research interests include...

D'Arrigo, R., R. Wilson, J. Palmer, P. Krusic, A. Curtis, J. Sakulich S. Bijaksana, S. Zulaikah and O. Ngkoimani. Monsoon drought over Java, Indonesia during the past two centuries. In press, Geophys. Res. Lett.

D'Arrigo, R., E. R. Cook, R. J. Wilson, R. Allan, and M. E. Mann. 2005. On the variability of ENSO over the past six centuries, Geophys. Res. Lett., 32, L03711, doi:10.1029/2004GL022055.

D'Arrigo, R., E. Mashig, D. Frank, R. Wilson and G. Jacoby. 2005. Temperature variability over the past millennium inferred from northwestern Alaska tree rings. Climate Dynamics 10.1007/s00382-004-0502-1.

D'Arrigo, R. , G. Jacoby, R. Wilson and F. Panagiotopoulos. 2005. A reconstruction of the Siberian high since AD1599 from Eurasian and North American tree rings. Geophys. Res. Lett. 32, L05705 10.1029/2004GL022271.

D'Arrigo, R., R. Wilson, C. Deser, G. Wiles, E. Cook, R. Villalba, S.Tudhope, J. Cole and B. Linsley. 2005. Tropical-North Pacific climate linkages over the past four centuries. Journal of Climate 18 (24): 5253-5265, Dec 15, 2005.

D'Arrigo, R., R. Wilson, F. Panagiotopoulos and B. Wu. 2005. On the long-term Interannual variability of the East Asian Winter Monsoon. Geophys. Res. Lett. Vol. 32, No. 21, L21706, 10.1029/2005GL023235.

D'Arrigo, R., R. Wilson, and G. Jacoby. 2006. On the long-term context for late twentieth century warming, J. Geophys. Res. 111, D03103, doi:10.1029/2005JD006352.

D'Arrigo, R., R. Wilson and G. Jacoby. On the Asian expression of the PDO. in press, Int. J. Climatology.

Driscoll, W., G. Wiles, R. D'Arrigo and M. Wilmking. . 2005. Dendroclimatic evidence of changing environmental stresses on tree growth, Lake Clark National Park and Preserve, Alaska. Geophys. Res. Lett. Vol. 32, No. 20, L20703 10.1029/2005GL024258.

Wilmking, M. R. D'Arrigo, G. Jacoby and G. Juday. 2005. Divergent growth responses in circumpolar boreal forests. Geophys. Res. Lett 32, L15715, 10.1029/2005GLO23331.

Wu, B., R. Zhang and R. D'Arrigo. Distinct modes of the East Asian winter monsoon. In press, Mon. Weath. Rev.

Jeffrey P. Donnelly

Associate Scientist, Geology & Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543
508-289-2994, email, web

The overarching goal of my research program is to understand how changes in climate have altered terrestrial and coastal systems in the recent geological past, to explore how landscape changes may have in turn impacted the climate system, and through this understanding improve our ability to project how coastal landforms and embayments will respond to future changes in these forcings. Primarily I use sedimentary and other natural archives to reconstruct past environmental conditions in order to develop a process oriented understanding of the causes and consequences of environmental change. For example, sea-level fluctuations, storms, and changing freshwater inputs play key roles in driving changes in many coastal systems, yet we know very little about how these environments respond to these multi-variant forcing mechanisms. Fortunately, all of these phenomena leave markers in the sedimentary record that we can sample and use to understand their impact through the late Holocene.

Shuman, B., and J.P. Donnelly, 2005, The influence of seasonal precipitation and Temperature Regimes on Lake Levels in the Northeastern United States during the Holocene: Quaternary Research, (in press).

Donnelly, J.P., 2005, A Revised Late Holocene Sea-Level Record for Northern Massachusetts, USA: Journal of Coastal Research (in press).

Donnelly, J.P., 2005, Evidence of Past Intense Tropical Cyclones from Backbarrier Salt Pond Sediments: A Case Study from Isla de Culebrita, Puerto Rico, USA: Journal of Coastal Research, SI42, p. 201-210.

Giosan, L., Donnelly, J.P., Vespremeanu, E., Bhattacharya, J.P., Olariu, C., Buonaiuto, F.S., 2005, River delta morphodynamics: Examples from Danube delta, in Giosan, L., and Bhattacharya, J.P. (Eds.), River Deltas: Concepts, Models and Examples, SEPM Special Publication 83, p. 391-410.

Shuman, B., P. Newby, J.P. Donnelly, A. Tarbox, and T. Webb III, 2005, A Record of Late-Quaternary Moisture-Balance Change and Vegetation Response from the White Mountains, New Hampshire: Annals of American Association of Geographers, v. 95, p. 237-248.

Donnelly, J.P., Driscoll, N., Uchupi, E., Keigwin, L., Schwab, W., Thieler, E.R., Swift, S., 2005, Catastrophic Meltwater Discharge down the Hudson River Valley: A Potential Trigger for the Intra-AllerØd Cold Period: Geology v. 33, p. 89-92.

William F. Ruddiman

Professor Emeritus, Department of Environmental Sciences, University of Virginia, Clark Hall, 291 McCormick Rd, PO Box 400123, Charlottesville, VA 22904-4123
434-924-7964, email, web

My research focuses on ocean sediments that contain diverse indicators of Earth's climate change over time scales ranging from thousands to tens of millions of years. Examples include records of regional aridity (windblown desert dust), oceanic productivity (fluxes of calcareous and siliceous planktonic organisms), and ice volume and temperature (stable-isotopic measurements). In addition, through co-operative experiments using numerical models of the earth's atmospheric and oceanic circulation, we devise and test hypotheses about the driving forces behind climatic changes, both longer-term tectonic changes (uplift of plateaus) and shorter-term variations in the earth-sun geometry ("orbital" changes).

What is the Timing of Orbital-Scale Monsoon Changes? W.F. Ruddiman, Quaternary Science Reviews 25, [April], (2006).

Comment on "A note on the relationship between ice core methane concentrations and insolation" by G. A. Schmidt et al. W.F. Ruddiman. Geophysical Research Letters 32, doi:10.1029/2005GL022599 (2005).

The early anthropogenic hypothesis a year later (and editorial reply). W.F. Ruddiman, Climatic Change 69, 427-434(2005).

How did humans first alter global climate? W.F. Ruddiman. Scientific American March, 46-53 (2005).

Cold climate during the closest stage 11 analog to recent millennia. W.F. Ruddiman. Quaternary Science Reviews 24, 1111-1121 (2005).

Test of the "overdue glaciation" hypothesis. W.F. Ruddiman, S.J. Vavrus, and J.E. Kutzbach. Quaternary Science Reviews, 24, 1-10 (2005).

Early anthropogenic overprints on Holocene climate. W.F. Ruddiman, PAGES News 12, 18-19 (2004).

Gavin A. Schmidt

NASA Goddard Institute for Space Studies and Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025
212-678-5627, email, web

My main research interest lies in understanding the variability of the climate, both its internal variability and the response to external forcing. In particular, how changes related to varying forcings relate to variations due to intrinsic (unforced) climate variability such as oscillations in the ocean's deep thermohaline circulation that affect ocean heat transports. I mainly use large-scale general circulation models for the atmosphere, and fully coupled ocean-atmosphere models to investigate these questions.

The evidence of long term paleo-climate variability exists primarily in the form of proxy data recorded in deep sea cores, ice cores, tree rings and other proxies such as the the skeletal remains of corals. Recently, my work has focussed on ways to reconcile the paleo-data with models. The main difficulty is that the proxy data are records of multiple processes and hence, it is difficult to unambiguously ascribe a climatic cause to any particular recorded event.

Field, C.V., G.A. Schmidt, D. Koch, and C. Salyk 2006. Modeling production and climate-related impacts on 10Be concentration in ice cores. J. Geophys. Res., in press.

LeGrande, A.N., G.A. Schmidt, D.T. Shindell, C.V. Field, R.L. Miller, D.M. Koch, G. Faluvegi, and G. Hoffmann 2006. Consistent simulations of multiple proxy responses to an abrupt climate change event. Proc. Natl. Acad. Sci. 103, 837-842, doi:10.1073pnas.0510095103.

J. Curt Stager

Natural Resources Division, Paul Smith's College, Paul Smiths, NY 12970, USA
518-327-3561, email, web

My research involves reconstructing patterns and causes of climate change, biological evolution, and human impacts on lakes, using diatoms and other bio/geological materials preserved in sediment cores. I have been working most recently on Lakes Victoria and Tanganyika (East Africa), Lakes Sibaya and Fundudzi (South Africa), and several Adirondack lakes near my home base at Paul Smith's College, NY. High-quality, experiential undergraduate education is the main focus of faculty here at this small, rural college, and students always play a major role in my investigations.

2002 Stager, J.C., P.A. Mayewski, and L.D. Meeker. Cooling cycles, Heinrich Event 1, and the desiccation of Lake Victoria. Palaeo-3: 183:169-178.

2003 Stager, J.C., B. Cumming, and L.D. Meeker. A 10,200 year high-resolution diatom record from Pilkington Bay, Lake Victoria, Uganda. Quat. Res. 59:172-181.

2004 Stager, J.C., J.J. Day, and S. Santini. Comment on "Origin of the superflock of cichlid fishes from Lake Victoria, East Africa." Science 304:963.

2004 Mayewski, P.A., E. Rohling, J.C. Stager, and 13 others. Holocene climate variability. Quat. Res. 62:243-255.

2005 Stager, J.C., J. Westwood*, D. Grzesik*, and B.F. Cumming. A 5500 year environmental history of Lake Nabugabo, Uganda. Palaeo-3 218:347-354.

2005 Stager, J.C., Ryves D., Cumming B.F., Meeker L.D., and Beer J. Solar variability and the levels of Lake Victoria, East Africa, during the last millennium. J. Paleolimnol. 33:243-251.

Lowell D. Stott

Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089-0740
213-740-5120, email, web

My research includes...

2005 Sinha, A., Cannariato, K. G., Stott, L. D., Li, H.-C., You, C.-F., Cheng, H., Edwards, R. L., and Singh, I. B., 2005, Variability of Southwest Indian summer monsoon precipitation during the Bolling-Allerod: Geology, v. 33, p. 813-816.

2004 Stott, L., Cannariato, K., Thunell, R., Haug, G.H., Koutavas, A., and Lund, S., 2004, Decline of surface temperature and salinity in the western tropical Pacific Ocean in the Holocene epoch: Nature, v. 431, p. 56-59.

2004 Broecker, Wallace, Barker, S., Clark, E., Hajdas, I, Bonani, G. and Stott, L. Ventilation of the Glacial Deep Pacific Ocean, Science, 306, 1169-1172.

2004 Holsten, J., Stott, L., and Berelson, W., Reconstructing Benthic Carbon Oxidation Rates Using d13C of Benthic Foraminifers. Marine Micropaleontology 53 (2004) 117Ð132

2004 Cannariato, K., and Stott, L. D. High-resolution bulk organic carbon d13C values argue against brief catastrophic releases of sedimentary methane to the surface waters of Santa Barbara Basin Geochemistry, Geophysics, Geosystems 5(5), doi: 10.1029/2003GC000600.

Ramzi Touchan

Associate Research Professor, Laboratory of Tree-Research and Joint Associate Professor, School of Natural Resources, University of Arizona
520-621-2992, email, web

I am an experienced dendrochronologist, dendroclimatologist, dendroecologist, and watershed and natural resources manager. Current research programs that are supported by NSF-ESH include establishing a multi-century network of climate records for the eastern Mediterranean, Near East, and North Africa based on tree rings by extending and enhancing existing tree-ring datasets, and by developing new tree-ring chronologies geographically and temporally. This network is being, and will continue to be, used to study interannual to century scale climate fluctuations in the region and their links to large-scale patterns of climate variability.

Touchan, R.; Funkhouser, G.; Hughes M.K.; Erkan, N. Standardized precipitation index reconstructed from Turkish tree-ring widths. Climatic Change, 72 (3):339-353 (2005).

Touchan, R., Xoplaki, E., Funkhouser, G., Luterbacher, J., Hughes, M.K., Erkan, N., Akkemik, †., and Stephan, J., Reconstructions of Spring/Summer Precipitation for the Eastern Mediterranean from Tree-Ring Widths and its Connection to Large-Scale Atmospheric Circulation , Climate Dynamics, 25:75-98 (2005).

Touchan, R.; Garfin, G.M.; Meko, D.M.; Funkhouser, G.; Erkan, N.; Hughes M.K.; Wallin, B.S. Preliminary reconstructions of spring precipitation in southwestern turkey from tree-ring width. International Journal of Climatology, 23:157-171 (2003).

Touchan, R. and Hughes, M.K. The role of dendrochronology in natural resource management. USDA Forest Service Proceedings RMRS-P-13:277-281 (2000).

Touchan, R., Meko, D.M., and Hughes, M.K. A 396-year reconstruction of precipitation in southern Jordan. Journal of the American Water Resources Association 35 (1): 45-55 (1999).

Touchan, R. and Hughes, M.K. Dendrochronology in Jordan. Journal of Arid Environments 42:291-303 (1999).