Simultaneous assimilation of Fengyun-4A and Himawari-8 aerosol optical depth retrieval to improve air quality simulations during one storm event over East Asia

Abstract

Aerosols are the main components of air pollutants, which are closely related to haze, dust storm and air pollution. In this study, an aerosol data assimilation system was developed using Gridpoint Statistical Interpolation (GSI) system to assimilate the Aerosol Optical Depth (AOD) observations from FY4 and Himawari-8 for the first time and applied in the heavy dust case over east Asia in March 2018. Three parallel experiments assimilated AOD from FY4, Himawari-8 and both the FY4 and Himawari-8 respectively and a control experiment which did not employ DA were performed. The hourly aerosol analyses and forecasts are compared with the assimilated FY-4 AOD, Himawari-8 AOD and independent AOD from Aerosol Robotic Network (AERONET). The results showed that all forms of DA experiments improved a low Bias and the RMSE reduced about 20%. The aerosol data assimilation with observations from both the FY-4 and Himawari-8 satellites substantially improved aerosol analyses and subsequent forecasts with more abundant aerosol observation information, especially over the northwest of China. This study indicates that the new generation geostationary meteorological satellites have potential to dramatically contribute to air quality forecasting.

1 Introduction

With rapid economic growth and accelerated urbanization, subsequent air pollution is becoming increasingly serious (Zhao et al., 2020). Aerosols are the main components of air pollutants, are closely related to haze, dust storms, and air pollution, and are present in very small amounts in the composition of the earth’s atmosphere. However, atmospheric aerosols have a direct impact on climate, including the energy budget of atmospheric radiation, changes in the microscopic and macroscopic characteristics of clouds, and indirect effects of atmospheric chemical processes (Hansen et al., 1997; Koren et al., 2004; Rosenfeld et al., 2008; Wilcox, 2012). Not only can they worsen air quality and reduce visibility, but they can also have an impact on human health, the environment, and climate change (Tie et al., 2009; Chen et al., 2017; Sicard et al., 2017; Liu et al., 2018; Zhao et al., 2018).

With continuous progress in satellite detection technology, satellite remote sensing can play a vital role in the study of atmospheric aerosols. Satellite observation can partly make up for the deficiency of conventional observation. Many studies have found that data assimilation can improve the level of model prediction (e.g., Zhang and Reid, 2006; Shen et al., 2022; Xu et al., 2022). Meteorological satellites are usually classified as geostationary (in geosynchronous orbit) or polar-orbiting (in sun-synchronous orbit) according to their orbits (Zou et al., 2011; Xu et al., 2013; Yang et al., 2017; Wang et al., 2020). Polar orbit meteorological satellites orbit the earth’s polar regions at an altitude of about 1,000 km. They are low-orbit satellites with an operating period of approximately 115 min. Polar-orbit satellites can monitor the global atmosphere and provide high-resolution products. However, they can only observe the same area twice a day and thus may miss rapidly developing dust storms. Conversely, geostationary satellites are high-orbit satellites, with an operational height of at least 35,786 km. Geostationary satellites have a large monitoring range and high temporal resolution, which are necessary for monitoring the development of rapidly evolving weather systems (Stengel et al., 2009; Yumimoto, 2013; Shen and Min, 2015; Li and Zou, 2017; Yang et al., 2017; Xia et al., 2019a). Many studies have found that meteorological data from geostationary satellites play an increasingly significant role in many weather applications, including monitoring heavy rain, severe weather, typhoons, and air pollution as a result of the high temporal resolution (Stuhlmann et al., 2005; Schmit et al., 2008; Yu et al., 2009; Goodman et al., 2012; Greenwald et al., 2016; Min et al., 2017).

In recent years, geostationary satellite data have been increasingly applied to air pollution and have had a positive influence on aerosol prediction. Yumimoto et al. (2016), Dai et al. (2019), and Xia et al. (2019b) presented data assimilation experiments, including aerosol optical depth (AOD), from the Himawari-8 satellite. Their results showed that data assimilation with rapid-update Himawari-8 observations improves aerosol analyses better than polar satellite observations. Niu et al. (2008) used the three-dimensional variational method (3DVAR) to assimilate the dust retrieval from the Fengyun-2 satellite (FY-2C). The results found that the dust aerosol data assimilation system could effectively improve the short-term prediction of dust weather. Wang et al. (2004) and Lee et al. (2016) employed AOD from the Goddard Earth Observing System-8 (GEOS-8) and the Geostationary Ocean Color Imager (GOCI) into a data assimilation (DA) system to evaluate efficiency, obtaining some significantly positive results.

The Fengyun-4 satellite (FY-4), which was successfully launched on 11 December 2016, is a new generation of geostationary orbit meteorological satellites for quantitative application to China. FY-4 is the realization of the upgrading and technological leap forward of China's geostationary orbit (GEO) meteorological satellites, with an overall performance reaching an internationally advanced level. FY-4 carries an advanced geosynchronous radiation imager (AGRI), a geostationary interferometric infrared sounder (GIIRS), and a lightning mapping imager (LMI) that can provide full-disk images for 14 spectral bands, with a temporal resolution of 15-min intervals and a spatial resolution of 0.5–4.0 km (Zhang et al., 2015; Min et al., 2017; Wang et al., 2019). The Japanese Himawari-8, a next-generation GEO satellite, was successfully launched in October 2014. In comparison with conventional geostationary satellites, the advanced Himawari imager (AHI) carried by Himawari-8 can provide more frequent observations and more aerosol-detectable channels (Bessho et al., 2016; Zhuge et al., 2017; Wang et al., 2018). Both FY-4 and the Himawari-8 belong to a new generation of advanced meteorological weather satellites. The effect of the Himawari-8 aerosol data assimilation system has been reported as mentioned previously. However, in regions such as northwest China, where Himawari-8 has little data coverage, it is necessary to assimilate both FY-4 and Himawari-8 aerosol data and conduct full research and analysis to improve the capability of air quality prediction.

In this study, we constructed a rapid-update aerosol data assimilation system to assimilate both FY-4 and Himawari-8 aerosol observations. This study is the first attempt to assimilate both these satellites’ aerosol observations using Gridpoint Statistical Interpolation (GSI).

This study used the three-dimensional variational method (3DVAR) within a GSI system as a follow-up to the work of Liu et al. (2011), who assimilated the MODIS AOD observations with the GSI system; the impact of MODIS AOD data assimilation was demonstrated by its application to a dust storm of 17–24 March 2010 over East Asia. Yumimoto et al. (2016) showed the first application of AOD derived from Himawari-8 data to aerosol data assimilation that targeted transboundary pollutants and dust outflows over East Asia over 14–17 April 2011. Wang et al. (2012) presented a new method for the combined use of satellite-measured radiances and inverse modeling to spatially constrain the amount and location of dust emissions. The technique was illustrated by a case study in May 2008. As shown in the work of Peng et al. (2018), an ensemble Kalman filter data assimilation (DA) system was developed to improve air quality forecasts. This DA system was applied to simultaneously adjust the chemical initial conditions (ICs) during an extreme haze episode that occurred in early October 2014 over East Asia. Their results showed the positive impact of their assimilation approach on air quality prediction through its application to one dust event. In this study, the added value of assimilating AHI and AGRI aerosol data was applied to a severe dust case over East Asia in March 2018 to assess the effectiveness of analysis and prediction.

The remaining sections of this article are arranged as follows. The AOD data used in this study are introduced in the following section. Section 3 presents the dust storm case, the details of the aerosol DA system, the experimental design, and the background error covariance. The results are discussed in Section 4. The summary and discussion are given in Section 5.

2 Observation data

FY-4 was successfully launched on 11 December 2016 by the Satellite Meteorological Center of China Meteorological Agency. FY-4 has realized the upgrading and technological leap forward of China’s GEO meteorological satellites. It can provide geostationary images over a large area from 24.1°E to 174.7°W between 80.6°N and 80.6°S. FY-4 is equipped with four optical instruments: an advanced geosynchronous radiation imager (AGRI), a geostationary interferometric infrared sounder (GIIRS), a lightning mapping imager (LMI), and a Solar X-EUV Imaging Telescope (SXEIT). The highly improved AGRI onboard FY-4 has 14 spectral bands from visible to infrared and provides full-disk images with a temporal resolution of 15-min intervals and spatial resolutions of 1 km for nadir channels, 2 km for near-infrared channels, and 4 km for the rest of the infrared channels (Zhang et al., 2015; Min et al., 2017; Yang et al., 2017).

In this study, AOD observations from FY-4 were selected for the newly developed data assimilation system. The FY-4 AOD products are provided by the National Satellite Meteorological Center with 4 km resolution and were then refined to the same resolution as the initial grid of the model—25km. The total observation error for AOD was suggested by Zhang et al. (2008), in which observation errors were estimated to be the retrieval uncertainty attached to the FY-4A AOD products plus a standard deviation calculated as the representative error in the re-gridding. The assimilation time window is 1 h, and all the observation data in the assimilation time window are included in the assimilation system. Furthermore, only FY-4 AOD marked as the best quality control flag with values less than 2.5 could be assimilated, as suggested by Saide et al. (2014).

The latest version of the Himawari-8 AOD (Kikuchi et al., 2018; Yoshida, et al., 2018; Dai et al., 2019) was used for comparison in this study; it can be downloaded free from the internet (http://www.eorc.jaxa.jp/ptree/index.html) and was then processed to the same resolution as our model. Furthermore, the AErosol RObotic NETwork (AERONET) AOD observations were used for the validation; these are freely available at the website (http://aeronet.gsfc.nasa.gov/) (Holben et al., 1998). The locations of AERONET sites employed in this study are presented in Figure 1.

FIGURE 1

3 Aerosol data assimilation system and experimental setup

3.1 The severe dust storm case

A dust storm affecting most regions of East Asia during 26–30 March 2018 was selected for this study. On 26 March 2018, a severe dust storm arrived in northeast Asia, with sand-blowing and flowing-dust weather appearing in central and eastern Inner Mongolia, northern Shanxi, central and northern Hebei, Beijing, Tianjin, and northeast China. The dust storm covered large regions, appeared in a concentrated time, and caused serious air pollution—visibility in the Beijing area was less than 400 m, accompanied by strong winds.

3.2 Aerosol data assimilation system

NCEP’s Gridpoint Statistical Interpolation (GSI) 3DVAR DA system—explained by Wu et al. (2002) and Kleist et al. (2009)—was expanded to assimilate FY-4A and Himawari-8 aerosol observations. The AOD observation operator was described by Liu et al. (2011). In this study, we added a new interface for the AOD observations from FY-4A and Himawari-8 to the GSI system as a follow-up to Liu et al. (2011) and Schwartz et al. (2012). Generally, the 3DVAR algorithm obtains an optimal analysis field by minimizing the deviation between the background and the observations. It constantly adjusts the weight ratio between the background and the observation by minimizing the given cost function so that the analysis field reaches optimal fit. The 3DVAR method is a problem of minimizing the cost function, and expression of the 3DVAR cost function J(x) could be expressed as follows (Lorenc, 1986; Ide et al., 1997; Chin, et al., 2000; Lorenc et al., 2000):where x represents the n-dimensional analysis vector to minimize the cost function J(x), is the m-dimensional observation operation, denotes the n-dimensional background variable vector, is the background error covariance matrix of dimensions , and R denotes the observation error covariance matrix of dimensions .

In this study, the WRF-Chem model was selected for aerosol transport prediction. The gaseous chemical mechanism was produced by the Goddard Chemistry Aerosol Radiation and Transport (GOCART) aerosol scheme (Ginoux et al., 2001; Chin et al., 2002), which simulated 14 aerosol types, including sulfate, dust, organic carbon (OC) hydrophobic and hydrophilic, black carbon (BC), and sea salt. The static background error covariance (BEC) matrix of aerosol variables is constructed by using the National Meteorological Center (NMC) method (Parrish and Derber, 2002). At present, this method is widely used for statistical analysis of model background error covariance. We took the differences of 24 and 12 h WRF-Chem forecasts of the aerosol species valid at the common time for 62 pairs valid from 25 February to 25 March 2018.

3.3 Model and experimental design

In this study, the WRF-Chem model was selected for aerosol transport prediction over the domain spanning east Asia (Figure 1) with a 25-km horizontal grid spacing. There were 250 × 160 grid points and 40 vertical levels. The top pressure was 50 hPa. The physical parameterizations were concluded in this study: the rapid radiative transfer model longwave radiation scheme (Mlawer et al., 1997), the Dudhia shortwave radiation scheme (Dudhia, 1989), the Mellor–Yamada–Janjic (MYJ) boundary layer scheme, the Noah land surface model, and the Yonsei University (YSU) planetary boundary layer scheme (Hong and Lim, 2006).

The data assimilation system to assimilate the FY-4A and Himawari-8 aerosol observations was constructed within the GSI. We designed four parallel experiments to assess the performance of the newly developed data assimilation system for this severe dust storm case of 26–30 March 2018 over East Asia. The WRF-Chem settings and physical parameterizations were uniform in all experiments and were the same as those introduced in the previous section. One experiment (CNT) did not employ any DA, while AOD DA was performed in the other three experiments. The other three experiments were all performed based on the GSI using the 3DVAR DA system, but they assimilated different satellite AOD observations: one assimilating FY-4A AOD (FY DA), another assimilating Himawari-8 AOD (Hima DA), and the last assimilating both FY-4A and Himawari-8 AOD (FY + Hima DA). As in Houtekamer et al. (2005), Pagowski et al. (2010), Schwartz et al. (2012), and Pang et al. (2018), the first 5 days’ aerosol forecast was used for spin-up, and then, the four experiments began with the same initial fields. In each experiment, a new aerosol forecast simulated by WRF-Chem was initialized at 1-h intervals from 00 UTC on 26 March to 12 UTC on 30 March 2018. For every initialization, the meteorological fields were updated by inserting the final reanalysis data (FNL) analysis into the research domain as a background in all experiments. For the three experiments that employed DA, the observations within each assimilation time window (±0.5) were assimilated. The 1-h prediction initiated by the previous periodic analysis was the background, and the analysis results were then updated hourly. Note that Himawari-8 AODs were only present during the daytime, for 11–12 h data available in East Asia (Yumimoto et al., 2016); therefore, the DA experiments only cycled during daylight hours when the aerosol data were available.

4 Results

In this section, the evaluations of aerosol analysis and prediction of all four experiments by comparing to AOD observations from FY-4, Himawari-8, and independent AERONET are presented.

4.1 Comparison to Himawari AOD and FY-4 AOD

The root-mean-square error (RMSE) and mean bias, as statistical indicators which were calculated from models and observations, were used to evaluate the effectiveness of the assimilation systems. Figure 2 presents the distribution of bias (Figures 2A, C, E) and RMSE (Figures 2B, D, E) of the simulation of AOD compared to the satellite observations in the FY (Figures 2A, B), Hima (Figures 2C, D), and FY + Hima DA systems (Figures 2E, F) over 26–30 March 2018. These statistics were employed to evaluate the effectiveness of the newly developed aerosol DA system. The X-axis represents the month and day in March 2018, and the Y-axis represents the value of averaged bias and RMSE. We also display the statistical analysis of the comparisons between simulation and observation AOD in the four experiments over 26–30 March 2018 in Tables 1, 2, 3, 4, and 5.

FIGURE 2

Figure 2 and Tables 1–5 show the results from the four simulations performed. In general, after assimilating AOD, the analysis results are more consistent with the observed AOD than the background; the DA system has good calibration of aerosol simulation, with the bias and RMSE reduced by about 20% in all three DA experiments (Hong and Lim, 2006). The CNT experiment did not perform very well, and the AOD was underpredicted (biases of −0.4 to −0.6). After AOD DA, the model low bias and RMSE were dramatically reduced to near −0.1 and 0.2, respectively, indicating that the assimilation of the AOD observations is beneficial for adjusting the background field. It is interesting that the assimilation employing both FY-4 and Himawari-8 reduced more than the other three DA experiments. This may mainly be because more abundant observation information on the dust storm was involved, so the assimilation analysis field was better adjusted to the background field.

The analysis and forecast impacts were then separately compared with the assimilated FY-4 and Himawari-8 AODs, which can directly show the effects of different satellite aerosol data assimilation on model simulation results (Benedetti et al., 2009). In the FY4 DA experiment (Figure 3), the CNT experiment (Figure 3C) failed to simulate the pollution, whereas the DA analysis field successfully presented the pollution over southern China (Figure 3B); however, very few adjustments were provided around Beijing and northeast China—particularly due to a lack of observations. The CNT experiment captured the main features of the dust storm in southeastern China, but the value was greatly underestimated, and then, the DA analysis reduced the underestimation of the aerosol loadings. The results in AOD derived from the Himawari-8 data assimilation system are displayed in Figure 4. Like Figure 3, Himawari-8 AOD data assimilation improved the low bias, and the analysis field was more consistent with the observed AOD distribution than the background field, which also verified the assimilation impact. Furthermore, the analysis fields presented a more abundant dust storm over Inner Mongolia and northeast China. However, little dust information was provided for northwest China due to a lack of observation data. The AOD derived from FY-4 and Himawari-8 were then included in the last aerosol data assimilation. As shown in Figure 5, the simulation of the dust storm in the CNT experiment was inadequate and the DA simulation improved the AOD values, which were much closer to the satellite observations. The analysis field contained many details of the dust storm system, and the addition of observation data strengthened the distribution of large AOD values in Beijing, Inner Mongolia, and the northeast China region, and especially in northwest China, can make up for the underestimation of CNT.

FIGURE 3

FIGURE 4

FIGURE 5

In general, the results suggest that the newly rapid-update aerosol data assimilation system which assimilates both the FY-4 and Himawari-8 aerosol observations in this study can significantly improve the forecast field, especially in northwest China where Himawari-8 has little data coverage. Data assimilation complemented related aerosol information, which is more conducive to accurately describing the formation and development process of pollution events.

4.2 Comparison with AERONET AOD

AERONET is an aerosol monitoring network of hundreds of solar photometers around the world, organized by the US National Aeronautics and Space Administration (NASA) and France’s National Center for Scientific Research (CNRS) (Holben et al., 1998). The ground AOD data obtained from AERONET were used to assess the impact of the assimilation results. This plays an important role in the study of global and regional aerosol optical properties, environmental and radiation effects, validation and evaluation of satellite remote sensing, and numerical model products (Schutgens et al., 2012). In this section, AOD data retrieved by six AERONET sites (See Figure 1) that were affected by the dust storm were selected for comparison with the analysis fields in the four experiments. As shown in Figure 6, the dust storm from 26 March to 30 March 2018 was detected by AERONET at the Anmyon, Beijing, Hong_Kong, Kanpur, Thimphu, and Xuzhou sites. In general, AOD values were underestimated in the control experiment (black line), the data assimilation greatly adjusted the aerosol analysis field, and the intensity is more consistent with AERONET stations. At all sites, the improved effect of the AOD values in the analysis was obvious after assimilating, and the overall variation trend of AOD prediction is more consistent with the ground AERONET data (Figures 6A, C, E, F). However, at the Beijing site (Figure 6B), DA experiments sometimes led to underpredictions, such as on 28 March. Moreover, at the Kanpur site (Figure 6D), where observations were insufficient, all DA experiments always underestimated the AOD values. At the Anmyon and Beijing sites, the Hima DA experiment (blue line) was more prominent, in which the simulated AOD values were closer to AERONET observations than the FY-4 DA experiment (green line). The FY-4 DA experiment performed better than the Hima DA experiment over the Hong Kong and Kanpur sites, likely because of the different coverage of satellite observations. It is interesting to point out that the analysis results in the assimilation experiment involving FY4 and Himawari-8 can better reflect the variation trend of AOD in the dust storm. The AOD values from the FY + Hima DA experiment (purple line) usually performed better than observations in the other three experiments. During the middle of the dust storm period, AOD values at the Beijing and Thimphu sites did not capture the extreme event even with AOD DA, when the air pollution reached a high level and the observed AOD value exceeded 1.0. In general, the assimilation achieved improvements at all six sites and the results showed that aerosol data assimilation could significantly improve the accuracy of forecasting dust storm events.

FIGURE 6

5 Summary and discussion

This study used a GSI-3DVAR data assimilation system to assimilate the hourly FY-4 and Himawari-8 AOD data. A dust storm in March 2018 was selected as an application to access the impact of the DA system. Three parallel experiments assimilated AOD from FY-4, Himawari-8, both FY-4 and Himawari-8, and a control experiment that did not employ DA. The results of analysis and forecasting were evaluated against AOD observations from FY-4, the Himawari-8 satellite, and the AERONET. In general, the experiment without data assimilation always underestimated the AOD values during the dust storm. All forms of DA experiments improved a low bias, and the RMSE was reduced by approximately 20%. Assimilation of satellite AOD data improved the initial field of the model obviously when compared with the control experiment and had an especially positive effect on the analysis and forecast fields. It is interesting to note that the assimilation employing both FY-4 and Himawari-8 provided the analysis field with more abundant aerosol observation information and a more accurate description of the model's initial field and had much better consistency with satellite observations than the other experiments. The comparison with AOD retrieved from AERONET also proved the ability of the newly developed data assimilation system to improve aerosol prediction.

These results show the potential improvement of air quality prediction systems through the assimilation of FY-4 and Himawari-8 AOD data, which indicates that the new generation geostationary meteorological satellites have the potential to greatly contribute to air quality forecasting. Further improvements could be made in the future by employing more advanced DA techniques and more accurate estimations of emissions. These will be further investigated in our future work.

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