A PRELIMINARY REPORT ON OZONE OBSERVATIONS AT LITTLE AMERICA, ANTARCTICA
Summaries of ozone measurements made at Little America, Antarctica during 1957 and 1958 are presented. Data include both total ozone observations made with a Dobson Ozone Spectrophotometer and surface ozone concentrations measured with the automatic ozone recorder developed by Regeller. Wind and ozo...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
1959
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.395.2625 http://docs.lib.noaa.gov/rescue/mwr/088/mwr-088-02-0043.pdf |
| Summary: | Summaries of ozone measurements made at Little America, Antarctica during 1957 and 1958 are presented. Data include both total ozone observations made with a Dobson Ozone Spectrophotometer and surface ozone concentrations measured with the automatic ozone recorder developed by Regeller. Wind and ozone roses were constructed to examine the variation of surface ozone with wind direction, and in addition the net meridional transport of surface ozone was computed for each month for a year. The computed northward transport of surface ozone during the winter months of June through September suggests a model for atmospheric circulation in the Antarctic. Assuming no ozone is created or destroyed by photochemical or other means during this dark period and that Little America is representative of its latitude, steady-state conditions require that the low-level outflow of ozone be compensated by inflow at ot'her levels. Both the lower stratospheric circumpolar jet inhibiting meridional transport and the stability of the Antarctic stratosphere inhibiting downward vertical transport lead us to ascribe the principal OZOIIC influx to the troposphere above the surface layer. Computations of the tropospheric ozone concentrations required to replace the low-level loss of ozone, using Itubin's values for the vertical distribution of the tropospheric mass transports, are in good agreement with the observations made by ozonesonde at Halley Bay. It thus appears that some of the ozone manufactured in the sunlit stratosphere of lower latitudes which enters the troposphere through the tropopause gap associated with the mid-latitude jet stream is transported into the Antarctic by winds of the vigorous winter storms which move around and into the continent, and finally sinks and then flows northward again as part of the 2- to 3-km. thick surface layer. 1. |
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