مطالعه موردی نقش گرمایش ناگهانی پوشنسپهر در تغییرات ازن کلی نیمکره شمالی | ||
| پژوهشهای دانش زمین | ||
| مقاله 7، دوره 14، شماره 1 - شماره پیاپی 53، 1402، صفحه 102-118 اصل مقاله (1.37 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.48308/esrj.2023.103141 | ||
| نویسنده | ||
| محمد مرادی* | ||
| پژوهشگاه هواشناسی، تهران، ایران | ||
| چکیده | ||
| در این پژوهش با استفاده از دادههای باز تحلیلی MERR2، اثر گرمایش ناگهانی پوشنسپهر بر تغییرات ازن کلی کلاهک قطبی در برخی زمستانهای نیمکره شمالی بررسی شد. برای این منظور یک سال بدون گرمایش ناگهانی پوشنسپهر(2011-2010)، یک سال با گرمایش ناگهانی فرعی(1992) و چند گرمایش ناگهانی اصلی بر اساس دوره زندگی (2018، 2009، 2013، 1987) انتخاب و ازن کلی کلاهک قطبی در این دورهها بررسی شد. از مقایسه تغییرات میانگین ازن کلی کلاهک قطبی نسبت به میانگین بلند مدت(2020-1979) در سال بدون گرمایش ناگهانی، با گرمایش ناگهانی نوع فرعی و اصلی، دیده شد که میانگین ازن کلی کلاهک قطبی در زمستان بدون گرمایش و با گرمایش نوع فرعی کمتر از میانگین بلند مدت و در زمستان با گرمایش ناگهانی نوع اصلی بیشتر از میانگین بلند مدت میباشد. نتایج نشان داد که بیهنجاری مثبت ازن کلی کلاهک قطبی در دوره رشد و بلوغ گرمایش ناگهانی پوشنسپهر نوع اصلی بیشتر و در دوره پیری آن کمتر است. هر چه طول دوره رشد و بلوغ بیشتر باشد و تغییرات میانگین مداری باد مداری نیز به سرعت کاهش یابد، بیهنجاری مثبت ازن کلی کلاهک قطبی نیز بیشتر است. در دوره رشد و بلوغ گرمایش ناگهانی پوشنسپهر، تاوه قطبی و جت شب قطبی لبه آن به سرعت تضعیف میشود و در نتیجه ازن کلی توسط گردش بروئر-دابسون از پوشنسپهر مناطق استوائی به کلاهک قطبی بهتر منتقل میشوند. همچنین در حین گرمایش ناگهانی پوشنسپهر، سرمایش دررو شاخه فروشارش قطبی گردش بروئر-دابسون تضعیف میشود. این مکانیسم نیز از طریق کاهش سرعت تخریب ازن، سبب افزایش ازن کلاهک قطبی میشود. | ||
| کلیدواژهها | ||
| ازن کلی کلاهک قطبی؛ چرخه زندگی؛ گرمایش ناگهانی پوشنسپهر؛ گردش بروئر-دابسون | ||
| عنوان مقاله [English] | ||
| The role of sudden stratospheric warming events on the total ozone variability in the northern hemisphere | ||
| نویسندگان [English] | ||
| Mohammad Moradi | ||
| Atmospheric Science and Meteorological Research (ASMERC), Tehran, Iran | ||
| چکیده [English] | ||
| Introduction The ozone is produced and destroyed by photochemical reactions between highly energetic ultraviolet photons and some gas species present in the stratosphere, especially the oxygen. Ozone was identified in the atmosphere by Schonbein (1867) and Chapman (1930) formulated the first set of chemical reactions in an attempt to explain the existence of an ozone vertical structure (Madhu, 2016). Ozone formation starts when a highly energetic photon coming from the sun with wavelength shorter than 242 nm dissociates an oxygen molecule resulting in two atoms of monoatomic oxygen (Langematz, 2019). Then given the high reactivity of atomic oxygen, these atoms quickly react between each other to form ozone. The ozone effectively absorbs the highly energetic ultraviolet radiation. The result of this absorption is the dissociation of ozone in molecular and atomic oxygen for wavelength shorter than 325 nm (Castillon, 2014; Douglass et al, 2014). Ozone is also destroyed through the recombination with atomic oxygen. The set of mechanisms presented above represent the Chapman Cycle. Atmospheric dynamics is known to be a major factor in the variability of stratospheric ozone distribution over the tropics from year to year. There is considerable evidence that the atmospheric total ozone amount is strongly influenced by the stratospheric circulation. Ozone is first formed in the tropical troposphere and then transported to the tropical stratosphere using Brewer-Dobson circulation. This circulation, systematically transports ozone from tropics to the middle and high latitudes (Gerber, 2012). Stratospheric sudden warming (SSWs) is a violent phenomenon in the winter polar region (Kodera, 2006). In a minor warming the temperature gradient reverses over a range of altitude at or below 10hPa and zonal wind at 10hPa is weakens but does not change its direction. When a major sudden stratospheric warming’s events occur, the zonal mean temperature at 10hPa around the polar cap for latitudes north of 60°N suddenly rises and increases by the 25K over period of several days and zonal-mean zonal wind reversal at 10hPa and 60oN during the winter from November to March (Moradi,1399). In this paper five major SSWs, one minor SSWs and one year without SSWs events were considered to study the variability of total column ozone over the polar cap region. Materials and methods In this study we have used the daily mean data from the Modern Era Retrospective Analysis for Research and Applications version 2 (MERRA2) and National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) assimilated data. From the MERRA2 data, zonal wind and temperature were obtained at 10hPa and total column ozone from 01 July 1991 to 30 Jun 1992 (1987-1987, 2008-2009, 2010-2011, 2012-20113, 2016-2017 and 2017-2018). The zonal mean temperature (total column ozone) averaged around the polar cap for latitudes north of 60°N (63°N). This is a good measure of the overall temperature and total column ozone content in the polar vortex. The average east-west (zonal) wind speed for 60°N. This is near the peak of the polar jet maximum. The study region covers 0.0° to 357.5° geographical longitudes and 60°N to 90°N geographical latitudes. From the NCEP/NCAR data, zonal wind and temperature daily were presented by a horizontal resolution of 2.5° ×2.5° at 10hPa in region study at different case studies and averaged from 0.0 to 357.5o geographical longitudes around the 60°N to 90°N geographical latitudes. To study the distribution of total column ozone during the sudden stratospheric warming events, five major SSWs, one minor SSWs and one year without SSWs events were identified (Table 1). To represent the total column ozone variations during the sudden stratospheric warming; the daily total column ozone in this cases are analyzed. Table 1. Characteristics of sudden stratospheric warming Row Year tYPE Duration (days) growth (day) maturation (day) decline (day) 1 2010-2011 Without SSWs - - - - 2 1991-1992 Minor 18 - - - 3 1986-1987 Major 66 37 17 12 4 2016-2017 12 11 0 1 5 2012-2013 29 6 12 10 6 2017-2018 29 12 2 15 7 2008-2009 46 16 4 26 Results and discussion The results showed that the during the five major SSWs events (one minor SSWs and one year without SSWs evens), total ozone column over polar cap region is increases (decrease) and the anomaly of this quantity is always positive (negative) compared to the long-term average. Furthermore, in during major SSWs events there observed an increase of 29-70 DU in total ozone column from the average value over the pole cap and if the major SSWs is strong total ozone is found to rise by 99-104 DU. The positive anomaly total column ozone in the polar cap is more in growth and maturation of the major SSWs and less in the period of decline. The longer the growth and maturation period and the faster of reduce of the zonal mean zonal flow, the positive anomaly total column ozone is higher. During the period of growth and maturation of major SSWs, the polar vortex and night jet are rapidly weakened, and total column ozone is better transferred from the equatorial stratosphere to the polar cap by the Brewer-Dobson circulation. During the major SSWs that warming of stratosphere, diabetic cooling on the Brewer-Dobson extra tropical down welling branch also weakens. This mechanism also increases the ozone of the polar cap by reducing the rate of ozone depletion. Conclusion In this study, the variation of polar cap total column ozone during one minor SSWs case (1991-1992), five major SSWs cases (1987-1987, 2008-2009, 2012-20113, 2016-2017, 2017-2018) and one year without SSWs events (2010-2011) was analyzed over the polar cap region. The results showed that the during the five major SSWs events (one minor SSWs and one year without SSWs evens), total ozone column over polar cap region is increases (decrease) and the anomaly of this quantity is always positive (negative) compared to the long-term average. During the major SSWs that warming of stratosphere, diabetic cooling on the Brewer-Dobson extra tropical down welling branch also weakens. This mechanism also increases the ozone of the polar cap by reducing the rate of ozone depletion. | ||
| کلیدواژهها [English] | ||
| Polar cap total column ozone, Life cycle, Major sudden stratospheric warnings, Brewer-Dobson circulation | ||
| مراجع | ||
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-شرعی پور، ز. و علی اکبری بیدختی، ع.ا.، 1393. بررسی افت و خیز زمستانی ازن کلی جو مربوط به امواج مقیاس همدیدی در منطقه ایران، مجله فیزیک زمین فضا، شماره 4، ص 139-154.
-مرادی، م.، 1399. ارتباط گرمایش ناگهانی پوشنسپهر نوع اصلی با تغییرات تاوه قطبی در دوره آماری 2019-1979، مجله فیزیک زمین فضا، شماره 3، ص 603-620.
-مرادی، م.، 1399. بررسی دوره زندگی گرمایش ناگهانی پوشنسپهر نوع اصلی در نیمکره شمالی، مجله جغرافیا و مخاطرات محیطی، شماره 4، ص 12-21.
-Ageyeva, V., Gruzdev, A.N., Elokhov, A.S., Mokhov, I.I. and Zueva, N.E., 2017. Sudden Stratospheric Warmings: Statistical Character is tics and Influence on NO2 and O3 Total Contents, Atmospheric and Oceanic Physics: 2017, v. 53(5), p. 477-486. -Ahrens, C.D., 2009. Meteorology Today: An Introduction to Weather, Climate, and the Environment, Ninth Edition. 2009, 2007 Brooks/Cole, Cengage Learning, 620 p. -Brewer, A.W., 1949. Evidence for a world circulation provided by measurements of helium and water vapor distribution in the strato-sphere: Q. J. Roy. Meteorol. Soc., v. 75, p. 351-363. -Castilllon, A.O., 2014. The evolution of the Brewer-Dobson circulation and the ozone layer during the last three decades: Thesis to get the degree of a doctor of philosophy. Universitat de Barcelona, 104 p. -Castanheira, J.M., Peevey, T.R., Marques, C.A.F. and Olsen, M.A., 2012. Relationships between Brewer-Dobson circulation, double tropopauses, ozone and stratospheric water vapour: Atmos. Chem. Phys., v. 12, p. 10195-10208. -Chapman, S., 1930. A theory of upper atmospheric ozone: Mem. Roy. Meteorol. Soc., v. 3, 103 p. -Chalapathi, G.V., Eswaraiah, S., Prasanth, P.V., Lee, J., Kumar, K.N. and Kim, Y.H, 2018. Unusual Changes in Stratospheric Ozone and Water Vapor Over Antarctica and its Relation to Mesosphere Dynamics during a Minor Sudden Stratosphere Warming: International Journal of Current Research and Review, v. 10, p. 53-58. -Dobson, G.M., 1956. Origin and distribution of the polyatomic molecules in the atmosphere: Proc. Roy. Soc. Ldn., A236, p. 187-193. -Douglass, A.R., Newman, P.A. and Solomon, S., 2014.The antractic ozone hole: An update: Physics Today, v. 67, p. 42-48. -Gerber, E.P., 2012. Stratospheric versus Tropospheric Control of the Strength and Structure of the Brewer–Dobson Circulation: Journal of atmospheric sciences, v. 69, p. 2857-2877. -Hong, H.J. and Reichler, T., 2020. Local and Remote Response of Ozone to Arctic Stratospheric Circulation Extremes: Atmospheric Chemistry and Physics. https://doi.org/10.5194/acp-2020-790. -Holton, J.R., Haynes, P.H., McIntyre, M.E., Douglass, A.R., Rood, R.B. and Pfister, L., 1995. Stratosphere-troposphere exchange: Rev. Geophys., v. 33, p. 403-439. -Limpasuvan, V., Thompson, D.W.J. and Hartmann, D.L., 2004. The life cycle of the northern hemisphere sudden stratospheric warmings: Journal of climate, v. 17, p. 2584-2596. -Linz, M., Abalos, M., Glanville, A.S., Kinnison, D.E, Ming, A. and Neu, J.L., 2019. The global diabatic circulation of the stratosphere as a metric forthe Brewer–Dobson circulation. Atmos: Chem. Phys., v. 19, p. 5069-5090. -Longematz, U., 2019. Stratospheric ozone: down and up through the Anthropocene: ChemTexts https://doi.org/10.1007/s40828-019-0082-7 -Madhu, V., 2016. Effects of Sudden Stratospheric Warming Events on the Distribution of Total Column Ozone over Polar and Middle Latitude Regions: Open Journal of Marine Science, v. 6, p. 302-316. -Rao, J., Ren, R., Chen, H., Yu, Y. and Zhou, Y., 2018. The stratospheric sudden warming event in February 2018 and its prediction by a climate system model: Journal of geophysics research atmospheric, v. 123, p. 13332-13345. -Shin, D., Song, S., Ryoo, S.B. and Lee, S.S, 2020. Variations in Ozone Concentration over the Mid-Latitude Region Revealed by Ozonesonde Observations in Pohang: South Korea. Atmosphere, v. 11, 746 p. -Tweedy, O.V., Limpasuvan, V., orsolini, Y.J., Smith, A.K., Garcia, R.R., Kinnison, D., Randall, C.E., Kvissel, O.K., Stordal, F., Harvey, L. and Chandran, A., 2013. Nighttime secondary ozone layer during major stratospheric sudden warming’s in specified-dynamics WACCM: Journal of geophysical research atmospheres, v. 118, p. 8346-8358. -Weber, M., Dikty, S., Burrows, J.P., Garnt, H., Dameris, M., Kubin, A., Abalichin, L. and Langematz, U., 2011. The Brewer-Dobson circulation and total ozone from seasonal to decadal time scales: Atmos. Chem. Phys., v. 11, p. 11221-11235. -Weber, M., Coldewey-Egbers, M., Fioletov, V.E., Frith, S.M., Wild, J.D., Burrows, J.P., Long, C.S. and Loyola, D., 2018. Total ozone trends from 1979 to 2016 derived from five merged observational datasets–the emergence into ozone recovery: Atmos. Chem. Phys., v. 18, p. 2097-2117. -Yamazaki, Y. and Matthias, V., 2019. Large-amplitude quasi-10-day waves in the middle atmosphere during final warming’s: Journal of Geophysical Research: Atmospheres, v. 124(17-18), p. 9874-9892. | ||
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