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Global Climate Change DigestArchives of the
Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999


OZONE DEPLETION: Ozone Distribution and Trends

Item #d98mar53

"Total Ozone Trends at Sixteen NOAA/CMDL and Cooperative Dobson Spectrophotometer Observatories During 1979-1996," W.D. Komhyr (EN-SCI Corp., POB 3234, Boulder CO 80307; e-mail:, G.C. Reinsel et al.,Geophys. Res. Lett., 24(24), 3225-3228, Dec. 15, 1997.

Trends determined at five U.S. mainland midlatitude stations for winter, spring, summer, fall and the entire year averaged -3.4, -4.9, -2.6, -1.9, and -3.3% per decade, respectively. Comparison with an earlier period shows that this reflects a 6.7% decrease since the mid-1960s. Results are also given for Antarctica and other locations.

Item #d98mar54

"Anomalously Low Ozone over the Arctic," P.A. Newman (Code 916, NASA-Goddard, Greenbelt MD 20771; e-mail:, G.F. Gleason et al.,Geophys. Res. Lett., 24(22), 2689-2692, Nov. 15, 1997.

Total Ozone Mapping Spectrometer measurements showed an extensive region of low column densities near the north pole in March 1997, 30% lower than the March average for the 1979-1982 period.

Item #d98mar55

"Long-Term Ozone Decline over the Canadian Arctic to Early 1997 from Ground-Based and Balloon Observations," V.E. Fioletov (Atmos. Environ. Serv., 4905 Dufferin St., Downsview ON M3H 5T4, Can.; e-mail:, J.B. Kerr et al.,Geophys. Res. Lett., 24(22), 2705-2708, Nov. 15, 1997.

Column ozone values over the High Arctic were as much as 45% below normal for some days in March 1997. The vortex wind pattern was unusual then, and similar to the Antarctic spring vortex.

Item #d98mar56

"Decadal Evolution of Total Ozone Decline: Observations and Model Results," K. Tourpali (Lab. Atmos. Phys., Aristotle Univ., POB 149, 54006 Thessaloniki, Greece; e-mail:, X.X. Tie et al.,J. Geophys. Res., 102(D20), 23,955-23,962, Oct. 27, 1997.

Examines the rate of change in total ozone decline over both the Northern and Southern Hemispheres for 1964-1993, with the aid of a 2-D chemical-transport model of the middle atmosphere. Model calculations indicate that the ozone depletion at high latitudes in both hemispheres is caused mainly by heterogeneous reactions on the surface of polar stratospheric clouds, but losses at northern midlatitudes are related to sulfate aerosols.

Item #d98mar57

Three related items in Nature, 389(6653), Oct. 1997:

"A Bad Winter for Arctic Ozone," R. Stolarski (Lab. Atmos., NASA-Goddard, Greenbelt MD 20771), 788-789. Comments on the following two papers and on prospects for predicting future ozone levels in the Arctic.

"Prolonged Stratospheric Ozone Loss in the 1995-96 Arctic Winter," M. Rex (Wegener Inst. for Polar & Marine Res., POB 60 01 49, D-14401 Potsdam, Ger; e-mail: N.R.P. Harris et al., 835-838. Reports the occurrence of the highest recorded chemical ozone loss over the Arctic region. If the apparent cooling trend in the Arctic stratosphere is real, more dramatic losses may occur in the future.

"Severe Chemical Ozone Loss in the Arctic During the Winter of 1995-96," R. Müller (Forschungszentrum Jülich, Inst. Stratospheric Chem. ICG-1, 52425 Jülich, Ger.; e-mail:, P.J. Crutzen et al., 709-712. Uses the correlation between CH4 and ozone in the Arctic polar vortex to discriminate between changes in ozone concentration due to chemical and dynamical effects.

Item #d98mar58

"Midwinter Start to Antarctic Ozone Depletion: Evidence from Observations and Models," H.K. Roscoe (British Antarctic Survey, High Cross, Madingley Rd., Cambridge CB3 0ET, UK; e-mail:, A.E. Jones, A.M. Lee,Science, 278(5335), 93-96, Oct. 3, 1997.

New observations with an instrument that permits winter measurements of ozone, combined with 3-D model calculations, show that the 1994 ozone depletion began in June at the sunlit vortex edge, and became substantial by late July.

Item #d98mar59

"Observations of the 1995 Ozone Hole over Punta Arenas, Chile," V.W.J.H. Kirchoff (Inst. Nacional Pesquisas Espaciais, C.P. 515, 12201-970 Sao José dos Campos, Sao Paulo, Brazil; e-mail:, Y. Sahai et al.,J. Geophys. Res., 102(D13), 16,109-16,120, July 20, 1997.

Examines the appearance of the ozone hole over a populated area with more than 100,000 inhabitants. The strongest depletion over Punta Arenas in 1995 occurred on Oct. 13, when the ozone column decreased from a "normal" value of about 325 Dobson units to 200.

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