Atmospheric Ozone Dynamics: Observations in the by Peter Borrell, Peter Builtjes, Peringe Grennfelt, Øystein

By Peter Borrell, Peter Builtjes, Peringe Grennfelt, Øystein Hov (auth.), Costas Varotsos (eds.)

An expanding allllo~/allce as a result of anthropogenically caused ozone depletion and appropriate illcrca5e of the skin ultraviolet (UV) radiation (including erythemal a part of the UV spectrum) has ended in the expansion of curiosity to overall ozone (TOZ) floor and satellite tv for pc observations, floor UV measurements (with an emphasis on UV -B) and. the translation of remark effects to evaluate power affects of the UV radiation enhancement on guy and biosphere. the importance of this phenomenon is diJIcrent in numerous cowltries. unique awareness has been paid, for example, to ozone depletion and UV radiation elevate at excessive latitudes (this challenge has additionally been mentioned through the Workshop). it's both transparent, besides the fact that, that low and mid-latitude environmental dynamics calls for carefuU tracking and evaluate of environm(:ntal tendencies to boot. the sort of end is principally precise for the Mediterranean area the place quite a few hotel locations can be found and topic to over the top degrees of sunlight Ultraviolet Radiation. the reason for this is that the NATO complicated Rcsearch Workshop "Ground-Level and satellite tv for pc Ozone Observations: adjustments within the Mediterranean quarter" was once geared up and happened in Athens (Grcccc) through the Lime interval 31 October -4 November 1995. it may be mentioned, although, that shows mentioned throughout the Workshop went some distance past the local scale of attention. This has been vitally important, since it opened an opportwlity to examine the Mediterrane:an environmental scenario within the broader contcx1 of the eu worldwide changes.

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In particular, the lower boundary condition is FZi = FD, + FE, (2) where FZi is the total vertical flux at the earth's surface, FDi the flux due to dry deposition and FEi the emission at or close to the surface. The mesoscale meteorological model MM5 drives the EURAD-CTM by providing the necessary meteorological fields calculated off-line. MM5 can be run in a hydrostatic and non-hydrostatic mode. , 1995). 68 degrees; global data sets every 6 hours). The nudging technique is employed for lower layer temperature and horizontal wind (Stauffer and Seaman, 1990).

The month-to-month changes in the ozone-temperature correlation may suggest the significant role of largescale transport of ozone connected with the polar vortex build-up, displacement or breakdown. 3. Conclusions The behaviour of the polar vortex (characterized by a considerable interannual variability) has strong implication to the northern hemisphere total ozone distribution. The occurrence of major warmings is connected with relatively high total ozone'winter-spring average. The strongest ozone depletions have occurred during the winters with the minor stratospheric warmings, especially when the polar vortex is displaced towards the ozone measuring station.

2. --. ~ '-" -4 - ~ ~ ~ -6 t3 0 ~ b f--; -8 -10 -12 - --1--1--1--1-----1--1--1---1--1--1--1 Jan Feb Mar Apr May Jun Jul Aug Sep Ocl Nov Dec MONTHS Fig. 3. 'nle trend of TOMS total aLOne versus month of the year for Berlin during the period 1979-1992_ 21 o - -2 ~ U ~ -4 - ~ if ,-.. f. 4. The trend of TOMS total ozone versus month of the year for London during the period 1979-1992. 22 References WMO and UNEP, 1995, The changing ozone layer, by Bojkov RD .. A, 1995, Recent trends of the total column ozone: implications for the Mediterranean region.

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