Archives of the
Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999

"Air Content Paleo Record in the Vostok Ice Core (Antarctica): A Mixed Record of Climatic and Glaciological Parameters," P. Martinerie (Lab. Glaciol. & Geophys. l'Environ., BP 96, F-38402 St.-Martin-d'Heres Cedex, France), V.Y. Lipenkov et al., J. Geophys. Res., 99(D5), 10,565-10,576, May 20, 1994.

"CO2 and Diatom Mats," L.J. Rothschild (MS 239-12, NASA-Ames, Moffet Field CA 94035), Nature, 368(6474), 817, Apr. 28, 1994.

"No Verification for Milankovitch," J.M. Landwehr (USGS, Natl. Ctr., Reston VA 22092), I.J. Winograd, T.B. Coplen, ibid., 368(6472), Apr. 14, 1994.

"Electrical Response of the Summit-Greenland Ice Core to Ammonium, Sulphuric Acid, and Hydrochloric Acid," J.C. Moore (Arctic Inst., Univ. Lapland, Box 122, SF-96101 Rovaniemi, Fin.), E.W. Wolff et al., Geophys. Res. Lett., 21(7), 565-568, Apr. 1, 1994.

"From 14C/12C Measurements Towards Radiocarbon Dating of Ice," R.S.W. Van de Wal (Inst. Marine & Atmos. Res., Univ. Utrecht, Princetonplein 5, 3584 CC, Utrecht, Neth.), J.J. Van Roijen et al., Tellus, 46B(2), 94-102, Apr. 1994.

Two items from Geophys. Res. Lett., 21(6), Mar. 15, 1994:

"Insoluble Particles in Polar Ice: Identification and Measurement of the Insoluble Background Aerosol," M. Ram (Dept. Phys., State Univ. New York, Buffalo NY 14260), R.I. Gayley, 437-440.

"Bond 13C/12C Ratios Reflect (Palaeo-)Climatic Variations," G.J. Van Klinken (Radiocarbon Accelerator Unit, 6 Keble Rd., Oxford OX1 3QJ, UK), H. Van der Plicht, R.E.M. Hedges, 445-448.

"A Geomagnetic Chronology for Antarctic Ice Accumulation," A. Mazaud (Ctr. Faibles Radioactiv., Lab. Mixte CNRS-CEA, Ave. de la Terrasse, 91198 Gif-sur-Yvette Cedex, France), C. Laj, M. Bender, ibid., 21(5), 337-340, Mar. 1, 1994.

"New Chemical Stratigraphy over the Last Millennium for Byrd Station, Antarctica," C.C. Langway Jr. (Dept. Geol., State Univ. New York, 4240 Ridge Lea Rd., Buffalo NY 14260), K. Osada et al., Tellus, 46B(1), 40-51, Feb. 1994.

"A Continuous Analysis Technique for Trace Species in Ice Cores," A. Sigg (Phys. Inst., Univ. Bern, Sidlerstr. 5, CH-3012 Bern, Switz.), K. Fuhrer et al., Environ. Sci. Technol., 28(2), 204-209, Feb. 1994.

Two items from Geophys. Res. Lett., 20(24), Dec. 23, 1993:

"The North Atlantic Oscillation Signature in Deuterium and Deuterium Excess Signals in the Greenland Ice Sheet Project 2 [GISP2] Ice Core, 1840-1970," L.K. Barlow (Inst. Arctic & Alpine Res., CB 450, Univ. Colorado, Boulder CO 80309), J.W.C. White et al., 2901-2904.

"Speleothems as Proxy for the Carbon Isotope Composition of Atmospheric CO2," M. Baskaran (Dept. Marine Sci., Texas A&M Univ., Galveston TX 77553), R.V. Krishnamurthy, 2905-2908.

"Spatial and Temporal Characterization of Hoar Formation in Central Greenland Using SSM/I Brightness Temperatures," C.A. Shuman (Earth Syst. Sci. Ctr., Pennsylvania State Univ., Univ. Pk. PA 16802), R.B. Alley, ibid., 20(23), 2643-2646, Dec. 14, 1993.

Two items from Nature, 366(6451), Nov. 11, 1993:

"Timing of the Younger Dryas Event in East Africa from Lake-Level Changes," N. Roberts (Dept. Geog., Loughborough Univ. Technol., Leicester LE11 3TU, UK), M. Taleb et al., 146-148.

"Very High Rates of Bedload Sediment Transport by Ephemeral Desert Rivers," J.B. Laronne (Dept. Geog. & Environ. Devel., Ben Gurion Univ. Negev, Beer Sheva 84105, Israel), I. Reid, 148-150. Data suggest that existing sediment transport equations are inadequate for rivers in arid environments.

Discussion on gravitational separation in polar firn, Science, 262(5134), 763-764, Oct. 29, 1993.

"Continental Water Recycling and H218O Concentrations," R.D. Koster (Hydrol. Sci. Br., NASA-Goddard, Greenbelt MD 20771), D.P. de Valpine, J. Jouzel, Geophys. Res. Lett., 20(20), 2215-2218, Oct. 22, 1993. Continental moisture recycling is almost as important as temperature in defining Ù18O distributions during Northern Hemisphere summer.

"A 5000-Year Record of Extreme Floods and Climate Change in the Southwestern United States," L.L. Ely (Earth Sys. Sci. Ctr., Pennsylvania State Univ., Univ. Pk. PA 16802), Y. Enzel et al., Science, 262(5132), 410-412, Oct. 15, 1993.

"A Natural Artifact in Greenland Ice-Core CO2 Measurements," R.J. Delmas (Lab. Glaciol. & Geophys. l'Environ., BP 96, 38402 St.-Martin-d'Heres Cedex, France), Tellus, 45B(4), 391-396, Sep. 1993. Interaction between acid and alkaline impurities, coexisting naturally in ice, could lead to production of excess CO2 in Greenland ice samples, and to erroneously high CO2 values for climatic transitions.

"Influence of Atmospheric CO2 on the Decline of C4 Plants During the Last Deglaciation," D.R. Cole (Chem. & Analyt. Sci. Div., Oak Ridge Natl. Lab., Oak Ridge TN 37831), H.C. Monger, Nature, 368(6471), 533-536, Apr. 7, 1994.

Presents palaeosol carbon isotope ratios that reveal a shift from C4 grasses to C3 shrubs about 7-9 kyr ago in the New Mexico desert, corresponding with an increase in atmospheric CO2 as recorded in Antarctic ice cores. Concludes that carbon isotope ratios of ancient soils can be a proxy for past CO2 changes.

"High Hopes for C4 Plants," P.D. Moore (Div. Life Sci., King's Coll., Campden Hill Rd., London W8 7AH, UK), Nature, 367(6461), 322-323, Jan. 27, 1994. Comments on the following paper and its relevance to the CO2-sensitivity mechanisms of plants:

[title unavailable], V.S. Rama Das (Palamur, India), S.K. Vats, Photosynthetica, 28, 91-97, 1993. C4 plants at high altitudes may be at an advantage under conditions of depleted CO2 (as in certain aquatic environments), because ambient levels of CO2 are lower.

"Ecophysiological Responses of Plants to Global Environmental Change Since the Last Glacial Maximum," D.J. Beerling (Dept. Animal & Plant Sci., Univ. Sheffield, POB 601, Sheffield S10 2UQ, UK), F.I. Woodward, New Phytol., 125(3), 641-648, Nov. 1993.

Data for fossil leaves of Salix herbacea L. show that stomatal conductance is negatively correlated with increases in atmospheric CO2 for the last 16,500 years. This result is the first evidence of long-term response of stomatal conductance to increases in atmospheric CO2.

"Elevated Atmospheric CO2 and Feedback Between Carbon and Nitrogen Cycles," D.R. Zak (Sch. Nat. Resour. & Environ., Univ. Michigan, Ann Arbor MI 48109), K.S. Pregitzer et al., Plant & Soil, 151, 105-117, Apr. 1993.

A study of bigtooth aspen seedlings showed that doubled CO2 caused faster growth, but also increased the carbon level in the soil, which in turn caused an increase in the microbial biomass of the soil and an increase in available nitrogen.