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Southern Hemisphere Mid- and High-Latitudinal AOD, CO, NO2, And Ahn et al. Progress in Earth and Planetary Science (2019) 6:34 Progress in Earth and https://doi.org/10.1186/s40645-019-0277-y Planetary Science RESEARCH ARTICLE Open Access Southern Hemisphere mid- and high- latitudinal AOD, CO, NO2, and HCHO: spatiotemporal patterns revealed by satellite observations Dha Hyun Ahn1, Taejin Choi2, Jhoon Kim1, Sang Seo Park3, Yun Gon Lee4, Seong-Joong Kim2 and Ja-Ho Koo1* Abstract To assess air pollution emitted in Southern Hemisphere mid-latitudes and transported to Antarctica, we investigate the climatological mean and temporal trends in aerosol optical depth (AOD), carbon monoxide (CO), nitrogen dioxide (NO2), and formaldehyde (HCHO) columns using satellite observations. Generally, all these measurements exhibit sharp peaks over and near the three nearby inhabited continents: South America, Africa, and Australia. This pattern indicates the large emission effect of anthropogenic activities and biomass burning processes. High AOD is also found over the Southern Atlantic Ocean, probably because of the sea salt production driven by strong winds. Since the pristine Antarctic atmosphere can be polluted by transport of air pollutants from the mid-latitudes, we analyze the 10-day back trajectories that arrive at Antarctic ground stations in consideration of the spatial distribution of mid-latitudinal AOD, CO, NO2, and HCHO. We find that the influence of mid-latitudinal emission differs across Antarctic regions: western Antarctic regions show relatively more back trajectories from the mid-latitudes, while the eastern Antarctic regions do not show large intrusions of mid-latitudinal air masses. Finally, we estimate the long-term trends in AOD, CO, NO2, and HCHO during the past decade (2005–2016). While CO shows a significant negative trend, the others show overall positive trends. Seasonal and regional differences in trends are also discussed. Keywords: Climatology, Aerosol optical depth, Carbon monoxide, Nitrogen dioxide, Formaldehyde, Southern Hemisphere Introduction Antarctic research stations can be attributed to the Antarctica is known as an isolated region due to its long-range transport from mid-latitudinal source re- geographical distance from human activity, as well as gions in South America and Africa. Gorodetskaya et the surrounding polar vortex hindering meridional al. (2014)coinedthephrase“atmospheric river” to exchange. However, some studies indicated the describe this transport pathway between subtropical effective transport of air pollutants from the latitudes and Antarctica. In terms of atmospheric dy- mid-latitudes to Antarctica in recent decades. For namics, the relationship between the mid-latitudinal example, Pereira et al. (2004) and Neff and Bertler and Antarctic atmospheric phenomena has been also (2015) found that mineral aerosols can be trans- examined (Gettelman et al. 2011). ported from Patagonia to West Antarctica by a cyc- Although these and several other studies have sug- lonic system. Fiebig et al. (2009) and Hara et al. gested a connection between the atmospheric environ- (2010) also suggested that observed aerosols at ment in Antarctica and that in the mid-latitudes (Pereira et al. 2004; Fiebig et al. 2009; Hara et al. 2010), a detailed * Correspondence: [email protected] understanding is still poor, particularly for climatological 1Department of Atmospheric Sciences, Yonsei University, Seoul, Republic of variables. Since atmospheric compositional change in Korea the polar region induces shifts in climatological patterns Full list of author information is available at the end of the article © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Ahn et al. Progress in Earth and Planetary Science (2019) 6:34 Page 2 of 16 (e.g., radiative forcing), the transport effects of air Methods/Experimental pollutants from the mid-latitudes should be further in- Data vestigated. In fact, some simulations indicate that the Moderate resolution imaging spectrometer, aerosol optical polar region can experience a substantial change in at- depth, and fire count mospheric radiative forcing due to the impact of pollu- The Aqua satellite, launched in 2002, crosses the equa- tant emissions from densely populated areas in the tor at 13:30 local time (LT) on a sun-synchronous orbit. mid-latitudes (e.g., Streets et al. 2013). In addition, sur- The Moderate Resolution Imaging Spectrometer face observations have revealed changes in polar physi- (MODIS), a 36-channel radiometer aboard the Aqua sat- cochemical properties: carbon-based materials and even ellite, observes irradiance with a spatial resolution of dust in the Antarctic region increased due to meridional 250 m to 1 km in nadir viewing. Using this observation, transport (Li et al. 2008; Stohl and Sodemann 2010). AOD is retrieved based on dark target (DT) and deep Certainly, there are also some local anthropogenic emis- blue (DB) algorithms, where DT is used for the meas- sions resulting in Antarctic pollution; for example, Ant- urement on dark surfaces such as the vegetative land arctic power generation, trash burning, and vehicle, ship, and dark ocean, and DB is used for measurement on and airplane transportation (Shirsat and Graf 2009; Graf bright surfaces (Sayer et al. 2014). Surface condition is et al. 2010). Nevertheless, a long-term background obtained from the MODIS climatology normalized dif- change over the broad Antarctic area is driven more by ference vegetation index (NDVI) (Huete et al. 2010). In the influence of external air masses from the each algorithm, total AOD is estimated when the ob- mid-latitudes. Therefore, determining the spatial distri- served TOA reflectance matches TOA from the combin- bution of air pollutants in the Southern Hemisphere and ation of the fine-mode-dominated aerosol model and the the typical transport routes to Antarctica is important coarse-mode-dominated aerosol model at two wave- (Bargagli 2008; McConnell et al. 2014). lengths. Final AOD product is produced by averaging Unfortunately, analysis based on ground-based ob- the results from DB and DT algorithms over land or servations in the Antarctic region is insufficient, to from the DT algorithm over the ocean. investigate the properties of pollutants in the South- For this study’s analysis, we use this final product, ern Hemisphere, due to spatial coverage limitations. called the MODIS-Aqua Combined DT and DB AOD at Installation of new ground-based stations is also not 550 nm for the land and ocean (MYD08_M3_v6), which an easy task because the Southern Hemisphere in- contains the high-quality assurance confidence flag cludes broader oceanic areas than the Northern (QAC) for each condition (Levy et al. 2013). The QAC Hemisphere. Application of model simulations could value is determined by the number of valid pixels with be an alternative way to overcome such limitations. screening cloud perturbations. Monthly mean values are However, ensuring reliable analysis is difficult because generated based solely on data having reliable QAC of the difficulty in performing validation, again due to values, meaning that our analysis is free from the cloud the paucity of in situ measurements. In such a situ- effect. Thus, this product can be used in this study with- ation, satellite measurements seem to be quite useful out additional screening tasks. Most aerosols are pro- for surmounting these limitations, but satellite data duced near the surface and transported in the lower have their own uncertainty issues in the Southern troposphere (Ocko and Ginoux 2017), hence AOD data Hemisphere, requiring careful application (McKenzie can be used to investigate tropospheric characteristics in et al. 2001; Nazaryan et al. 2008). If we focus on the general. median pattern, which is free from outlier influence, then analysis of long-term satellite observations can Measurements of pollution in the troposphere: carbon assist in the investigation of climatological patterns monoxide and temporal trends. Measurements of Pollution in the Troposphere (MOPITT), For this purpose, we use long-term satellite measure- a module aboard the Terra satellite, launched in 1999, has ments of aerosol optical depth (AOD), carbon monoxide offered an observation dataset since 2000. The Terra satel- (CO), nitrogen dioxide (NO2), and formaldehyde (HCHO) lite crosses the Equator at 10:30 and 22:30 LT on a to investigate climatological mean patterns, particularly sun-synchronous orbit, and MOPITT observes CO and me- spatiotemporal distributions and the long-term trends. thane (CH4) with a field of view of 22 km × 22 km in nadir Additionally, the back trajectory model results are used to viewing (Deeter et al. 2003). MOPITT CO total column investigate how mid-latitudinal particles and trace gases data are retrieved by three algorithms: TIR-only (exploiting are transported to Antarctica. Through this analysis, we the 4.7 μm thermal-infrared channel only), NIR-only expect to diagnose whether changes in the mid-latitudinal (exploiting the 2.3 μm near-infrared channel only), and atmospheric composition in the Southern Hemisphere multispectral TIR-NIR (exploiting both thermal-infrared tend to increase Antarctic air pollution.
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