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Associate Professor

Khatri Pradeep

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Profile

Faculty of Science and Engineering Department of Green Technology
Faculty of Science and Engineering Department of Science and Engineering for Sustainable Innovation
Graduate School of Science and Engineering Environmental Engineering for Symbiosis Major
Specialized Field

Atmospheric science, atmospheric remote sensing
Research theme
  1. Elucidation of the dynamics of aerosols and clouds and their impact on climate using remote sensing data
  2. Development of ground-based remote sensing methods for aerosols and clouds and their application analysis
  3. Accuracy assessment and improvement of aerosol and cloud products based on satellite observations
research content

Aerosols are fine particles of anthropogenic or natural origin suspended in the atmosphere. They directly affect the radiation field by scattering and absorbing solar radiation, while indirectly affecting the climate by changing the number and reflectance of cloud particles and precipitation. However, scientific understanding of the climate impact of aerosols, which vary greatly geographically and spatially and have a short life span, is limited compared to greenhouse gases such as carbon dioxide. To solve these problems, we are working to clarify the climate impact of aerosols and clouds using remote sensing techniques. As part of this, we are conducting research on ground-based observation of aerosols and clouds, developing new remote sensing methods, analyzing ground and satellite remote sensing data, and evaluating and improving the accuracy of satellite observation products using ground observation data. We are also working on interdisciplinary research with other fields closely related to the atmosphere, such as renewable energy, health hazards, air purification, and sustainable agriculture.
Subjects in charge

Geochemistry, Environmental Science, Introduction to Earth Science, Topics in Advanced Science and Engineering, Case Study II: Science and Engineering, Earth Science Experiments, Environmental Analytical Chemistry Experiments, Special Seminar on Environmental Symbiotic Engineering I-IV, Special Research on Environmental Symbiotic Engineering I-IV
Specialized Field

Atmospheric science, atmospheric remote sensing
Research theme
  1. Elucidation of the dynamics of aerosols and clouds and their impact on climate using remote sensing data
  2. Development of ground-based remote sensing methods for aerosols and clouds and their application analysis
  3. Accuracy assessment and improvement of aerosol and cloud products based on satellite observations
research content Aerosols are fine particles of anthropogenic or natural origin suspended in the atmosphere. They directly affect the radiation field by scattering and absorbing solar radiation, while indirectly affecting the climate by changing the number and reflectance of cloud particles and precipitation. However, scientific understanding of the climate impact of aerosols, which vary greatly geographically and spatially and have a short life span, is limited compared to greenhouse gases such as carbon dioxide. To solve these problems, we are working to clarify the climate impact of aerosols and clouds using remote sensing techniques. As part of this, we are conducting research on ground-based observation of aerosols and clouds, developing new remote sensing methods, analyzing ground and satellite remote sensing data, and evaluating and improving the accuracy of satellite observation products using ground observation data. We are also working on interdisciplinary research with other fields closely related to the atmosphere, such as renewable energy, health hazards, air purification, and sustainable agriculture.
Subjects in charge

Geochemistry, Environmental Science, Introduction to Earth Science, Topics in Advanced Science and Engineering, Case Study II: Science and Engineering, Earth Science Experiments, Environmental Analytical Chemistry Experiments, Special Seminar on Environmental Symbiotic Engineering I-IV, Special Research on Environmental Symbiotic Engineering I-IV
Main career, work history, and academic background

July 2001 Graduated from School of Environmental Engineering, Zhejiang University, China

September 2003: Completed Master's course at the Graduate School of Environmental Studies, Nagoya University

March 2007: Completed doctoral course at the Graduate School of Environmental Studies, Nagoya University

March 2007 - September 2007 Part-time Lecturer at the Faculty of Liberal Arts, Aichi Gakuin University

October 2007 - September 2009: Foreign Research Fellow, Center for Environmental Remote Sensing, Chiba University

October 2009 - March 2010 Assistant, Center for Environmental Remote Sensing, Chiba University

April 2010 - March 2011 Specially Appointed Assistant Lecturer, Center for Environmental Remote Sensing, Chiba University

April 2011 - September 2011: Researcher at the Center for Environmental Remote Sensing, Chiba University

October 2011 - March 2016 Specially Appointed Assistant Lecturer, Center for Environmental Remote Sensing, Chiba University

April 2016 - January 2017 Education and Research Supporter, Center for Environmental Remote Sensing, Chiba University

February 2017 - December 2019: Assistant Lecturer Graduate School of Science, Northeastern University University

January 2020 - March 2024 Lecturer Graduate School of Science, Northeastern University University

April 2024 ~ Associate Professor, Department Department of Science and Engineering for Sustainable Innovation Faculty of Science and Engineering Soka University
Affiliated academic societies and organizations
  • American Geophysical Union (AGU)
  • Japan Geoscience Union (JpGU)
  • Meteorological Society of Japan (MSJ)
Main Papers and Publications
  1. Ningombam, S. S., Larson, E. J. L., Indira, G., Madhavan, B. L., and Khatri, P.: Aerosol classification by application of machine learning spectral clustering algorithm, Atmospheric Pollution Research, 15, 10.1016/j.apr.2023.102026, 2024.
  2. Khatri, P., Yoshida, K., and Hayasaka, T.: Aerosol Effects on Water Cloud Properties in Different Atmospheric Regimes, Journal of Geophysical Research: Atmospheres, 128, 10.1029/2023jd039729, 2023.
  3. Letu, H., Ma, R., Nakajima, T. Y., Shi, C., Hashimoto, M., Nagao, T. M., Baran, A. J., Nakajima, T., Xu, J., Wang, T., Tana, G., Bilige, S., Shang, H., Chen, L., Ji, D., Lei, Y., Wei, L., Zhang, P., Li, J., Li, L., Zheng, Y., Khatri, P., and Shi, J.: Surface Solar Radiation Compositions Observed from Himawari-8/9 and Fengyun-4 Series, Bulletin of the American Meteorological Society, 104, E1772-E1789, 10.1175/bams-d-22-0154.1, 2023.
  4. Singh, T., Y. Matsumi, T. Nakayama, S. Hayashida, P. K. Patra, N. Yasutomi, M. Kajino, K. Yamaji, P. Khatri, M. Takigawa, H. Araki, Y. Kurogi, K. Kuji, K. Muramatsu, R. Imasu, A. Ananda, A. A. Arbain, R. Khaiwal, S. Bhardwaj, S. Kumar, S. Mor, S. K. Dhaka, A. P. Dimri, A. Sharma, N. Singh, M. S. Bhatti, R. Yadav, K. Vatta, and S. Mor, Very high particulate pollution over northwest India captured by a high-density in situ sensor network, Sci Rep,doi: 10.1038/s41598-023-39471-1, 2023.
  5. Kobayashi, H., H. Irie, M. Momoi, T. Ohno, H. Yamamoto, P. Khatri, I. Sano, H. Okumura, H. Kobayashi, Development and classification of Japanese-region-specific aerosol modes based on 10-year sky radiometer observations, Sola, doi:10.2151/sola.2023-027,2023.
  6. Khatri, P., and T. Hayasaka, Comparison of Cloud Properties between SGLI Aboard GCOM-C Satellite and MODIS Aboard Terra Satellite, Remote Sensing, 15(4), doi:10.3390/rs15041075,2023.
  7. Ningombam, S. S., P. Khatri, E. J. L. Larson, U. C. Dumka, C. Sarangi, and R. Vineeth, Classification of MODIS fire emission data based on aerosol absorption Angstrom exponent retrieved from AERONET data, Sci Total Environ, 858(Pt 2), 159898, doi:10.1016/j.scitotenv.2022.159898,2023.
  8. Patra, P. K., and P. Khatri, Atmospheric Mixing Ratio of Greenhouse Gases and Radiative Forcing. In: Handbook of Air Quality and Climate Change, Akimoto, H., and H. Tanimoto (eds), Springer, Singapore. doi: 10.1007/978-981-15-2527-8_29-1,2022.
  9. Dumka, U. C., D. G. Kaskaoutis, P. Khatri, S. S. Ningombam, R. Sheoran, S. Jade, T. S. Shrungeshwara, and M. Rupakheti, Water vapour characteristics and radiative effects at high-altitude Himalayan sites, Atmospheric Pollution Research, 13(2), doi:10.1016/j.apr.2021.101303,2022.
  10. Khatri, P., T. Hayasaka, H. Irie, H. Letu, T. Y. Nakajima, H. Ishimoto, and T. Takamura, Quality assessment of Second-generation Global Imager (SGLI)-observed cloud properties using SKYNET surface observation data, Atmospheric Measurement Techniques, 15(6), 1967-1982, doi:10.5194/amt-15-1967-2022,2022a.
  11. Khatri, P., T. Hayasaka, B. N. Holben, R. P. Singh, H. Letu, and S. N. Tripathi, Increased aerosols can reverse Twomey effect in water clouds through radiative pathway, Sci Rep, 12(1), 20666, doi:10.1038/s41598-022-25241-y,2022b.
  12. Kajino, M., M. Deushi, T. T. Sekiyama, N. Oshima, K. Yumimoto, T. Y. Tanaka, J. Ching, A. Hashimoto, T. Yamamoto, M. Ikegami,A. Kamada, M. Miyashita, Y. Inomata, S. Shima, P. Khatri, A. Shimizu,H. Irie, K. Adachi, Y. Zaizen, Y. Igarashi, H. Ueda, T. Maki, and M. Mikami, Comparison of three aerosol representations of NHM-Chem (v1.0) for the simulations of air quality and climate-relevant variables, Geoscientific Model Development, 14(4), 2235-2264, doi:10.5194/gmd-14-2235-2021,2021.
  13. Khatri, P., and T. Hayasaka, Impacts of COVID-19 on Air Quality over China: Links with Meteorological Factors and Energy Consumption, Aerosol and Air Quality Research, 21(10), doi:10.4209/aaqr.200668,2021.
  14. Khatri, P., T. Hayasaka, B. Holben, S. N. Tripathi, P. Misra, P. K. Patra, S. Hayashida, and U. C. Dumka, Aerosol Loading and Radiation Budget Perturbations in Densely Populated and Highly Polluted Indo‐Gangetic Plain by COVID‐19: Influences on Cloud Properties and Air Temperature, Geophysical Research Letters, 48(20), doi:10.1029/2021gl093796,2021.
  15. Letu, H., T. Y. Nakajima, T. Wang, H. Shang, R. Ma, K. Yang, A. J. Baran, J. Riedi, H. Ishimoto, M. Yoshida, C. Shi, P. Khatri, Y. Du, L. Chen, and J. Shi, A new benchmark for surface radiation products over the East Asia-Pacific region retrieved from the Himawari-8/AHI next-generation geostationary satellite, Bulletin of the American Meteorological Society, 1-40, doi:10.1175/bams-d-20-0148.1,2021.
  16. Misra, P., M. Takigawa, P. Khatri, S. K. Dhaka, A. P. Dimri, K. Yamaji, M. Kajino, W. Takeuchi, R. Imasu, K. Nitta, P. K. Patra, and S. Hayashida, Nitrogen oxides concentration and emission change detection during COVID-19 restrictions in North India, Sci Rep, 11(1), 9800, doi:10.1038/s41598-021-87673-2,2021.
  17. Takamura, T., and P. Khatri, Uncertainties in Radiation Measurement Using a Rotating Shadow-Band Spectroradiometer, Journal of the Meteorological Society of Japan. Ser. II, 99(6), 1547-1561, doi:10.2151/jmsj.2021-075,2021.
  18. Wetchayont, P., T. Hayasaka, and P. Khatri, Air Quality Improvement during COVID-19 Lockdown in Bangkok Metropolitan, Thailand: Effect of the Long-range Transport of Air Pollutants, Aerosol and Air Quality Research, 21(7), doi:10.4209/aaqr.200662,2021.
  19. Letu, H., K. Yang, T. Y. Nakajima, H. Ishimoto, T. M. Nagao, J. Riedi, A. J. Baran, R. Ma, T. Wang, H. Shang, P. Khatri, L. Chen, C. Shi, and J. Shi, High-resolution retrieval of cloud microphysical properties and surface solar radiation using Himawari-8/AHI next-generation geostationary satellite, Remote Sensing of Environment, 239, doi:10.1016/j.rse.2019.111583,2020.
  20. Khatri, P., H. Ooashi, and H. Iwabuchi, Investigating Aerosol Effects on Maritime Deep Convective Clouds Using Satellite and Reanalysis Data, Sola, 16(0), 228-232, doi:10.2151/sola.2020-038,2020.
  21. Nakajima, T., M. Campanelli, H. Che, V. Estellés, H. Irie, S.-W. Kim, J. Kim, D. Liu, T. Nishizawa, G., V.  K. Soni, B. Thana, N.-U. Tugjsurn, K. Aoki, S. Go, M. Hashimoto, A. Higurashi, S. Kazadzis, P. Khatri, N. Kouremeti, R. Kudo, F. Marenco, M. Momoi, S. S. Ningombam, C. L. Ryder, A. Uchiyama, and A. Yamazaki, An overview of and issues with sky radiometer technology and SKYNET, Atmospheric Measurement Techniques, 13(8), 4195-4218, doi:10.5194/amt-13-4195-2020,2020.
  22. Damiani, A., H. Irie, T. Takamura, R. Kudo, P. Khatri, H. Iwabuchi, R. Masuda, and T. Nagao, An Intensive Campaign-Based Intercomparison of Cloud Optical Depth from Ground and Satellite Instruments under Overcast Conditions, Sola, 15(0), 198-204, doi:10.2151/sola.2019-036,2019.
  23. Irie, H., H. M. S. Hoque, A. Damiani, H. Okamoto, A. M. Fatmi, P. Khatri, T. Takamura, and T. Jarupongsakul, Simultaneous observations by sky radiometer and MAX-DOAS for characterization of biomass burning plumes in central Thailand in January–April 2016, Atmospheric Measurement Techniques, 12(1), 599-606, doi:10.5194/amt-12-599-2019,2019.
  24. Khatri, P., H. Iwabuchi, T. Hayasaka, H. Irie, T. Takamura, A. Yamazaki, A. Damiani, H. Letu, and Q. Kai, Retrieval of cloud properties from spectral zenith radiances observed by sky radiometers, Atmospheric Measurement Techniques, 12(11), 6037-6047, doi:10.5194/amt-12-6037-2019,2019.
  25. Damiani, A., H. Irie, T. Horio, T. Takamura, P. Khatri, H. Takenaka, T. Nagao, T. Y. Nakajima, and R. R. Cordero, Evaluation of Himawari-8 surface downwelling solar radiation by ground-based measurements, Atmospheric Measurement Techniques, 11(4), 2501-2521, doi:10.5194/amt-11-2501-2018,2018.
  26. Mok, J., N. A. Krotkov, O. Torres, H. Jethva, Z. Li, J. Kim, J.-H. Koo, S. Go, H. Irie, G. Labow, T. F. Eck, B. N. Holben, J. Herman, R. P. Loughman, E. Spinei, S. Soo Lee, P. Khatri, and M. Campanelli, Comparisons of spectral aerosol single scattering albedo in Seoul, South Korea, Atmospheric Measurement Techniques, 11(4), 2295-2311, doi:10.5194/amt-11-2295-2018,2018.
  27. Khatri, P., T. Hayasaka, H. Iwabuchi, T. Takamura, H. Irie, and T. Y. Nakajima, Validation of MODIS and AHI Observed Water Cloud Properties Using Surface Radiation Data, Journal of the Meteorological Society of Japan. Ser. II, 96B(0), 151-172, doi:10.2151/jmsj.2018-036,2018a.
  28. Khatri, P., H. Iwabuchi, and M. Saito, Vertical Profiles of Ice Cloud Microphysical Properties and Their Impacts on Cloud Retrieval Using Thermal Infrared Measurements, Journal of Geophysical Research: Atmospheres, 123(10), 5301-5319, doi:10.1029/2017jd028165,2018b.
  29. Irie, H., T. Horio, A. Damiani, Y. T. Nakajima, H. Takenaka, M. Kikuchi, P. Khatri, and K. Yumimoto, Importance of Himawari-8 Aerosol Products for Energy Management System, Earozoru Kenkyu, 32, 95-100, doi:10.11203/jar.32.95,2017.
  30. Khatri, P., T. Takamura, T. Nakajima, V. Estellés, H. Irie, H. Kuze, M. Campanelli, A. Sinyuk, S. -M. Lee, B. J. Sohn, G. Padhithurai, S. -W.Kim, S. C. Yoon, J. A. M. Lozano, M. Hashimoto, P. C. S. Devara , and N. Manago, Factors for inconsistent aerosol single scattering albedo between SKYNET and AERONET, Journal of Geophysical Research: Atmospheres, 121(4), 1859-1877, doi:10.1002/2015jd023976,2016a.
  31. Khatri, P., H. Irie, T. Takamura, and H. Letu, Optical characteristics of aerosols and clouds studied by using ground-based SKYNET and satellite remote sensing data, IEEE International Geoscience and Remote Sensing, 377-380, doi:10.1109/IGARSS.2016.7729092,2016b.
  32. Yumimoto, K., T. M. Nagao, M. Kikuchi, T. T. Sekiyama, H. Murakami, T. Y. Tanaka, A. Ogi, H. Irie, P. Khatri, H. Okamura, K. Arai, I. Morino, O. Uchino, and T. Maki, Aerosol data assimilation using data from Himawari‐8, a next‐generation geostationary meteorological satellite, Geophysical Research Letters, 43(11), 5886-5894, doi:10.1002/2016gl069298,2016.
  33. Nakajima, T. Y., T. Nakajima, H. Irie, Y. Shimoda, Y. Iwafune, K. Hidaka, Y. Yamamoto, H. Takenaka, T. Watanabe, P. Khatri, J. Uchida, T. Inoue, A. Higurashi, S. Nishikori, M. Tsujimoto, and K. Aramaki, Earth science and demand science for the energy management system, Journal of the society of instruments and control engineers, 55, 585-591, doi:10.11499/sicejl.55.585,2016.
  34. Ningombam, S. S., S. P. Bagare, P. Khatri, B. J. Sohn, and H. J. Song, Estimation of aerosol radiative forcing over an aged-background aerosol feature during advection and non-advection events using a ground-based data obtained from a Prede Skyradiometer observation, Atmospheric Research, 164-165, 76-83, doi:10.1016/j.atmosres.2015.05.001,2015.
  35. Sugimoto, N., A. Shimizu, T. Nishizawa, I. Matsui, Y. Jin, P. Khatri, H. Irie, T. Takamura, K. Aoki, and B. Thana, Aerosol characteristics in Phimai, Thailand determined by continuous observation with a polarization sensitive Mie–Raman lidar and a sky radiometer, Environmental Research Letters, 10(6), doi:10.1088/1748-9326/10/6/065003,2015.
  36. Bi, J., J. Shi, Y. Xie, Y. Liu, T. Takamura, and P. Khatri, Dust Aerosol Characteristics and Shortwave Radiative Impact at a Gobi Desert of Northwest China during the Spring of 2012, Journal of the Meteorological Society of Japan. Ser. II, 92A(0), 33-56, doi:10.2151/jmsj.2014-A03,2014.
  37. Campanelli, M., T. Nakajima, P. Khatri, T. Takamura, A. Uchiyama, V. Estelles, G. L. Liberti, and V. Malvestuto, Retrieval of characteristic parameters for water vapour transmittance in the development of ground-based sun–sky radiometric measurements of columnar water vapour, Atmospheric Measurement Techniques, 7(4), 1075-1087, doi:10.5194/amt-7-1075-2014,2014.
  38. Che, H., G. Shi, H. Zhao, T. Nakajima, P. Khatri, T. Takamura, H. Wang, Y. Wang, J. Sun, and X. Zhang, Aerosol Optical Properties Retrieved from a Prede Sky Radiometer over an Urban Site of Beijing, China, Journal of the Meteorological Society of Japan. Ser. II, 92A(0), 17-31, doi:10.2151/jmsj.2014-A02,2014.
  39. Koike, M., N. Moteki, P. Khatri, T. Takamura, N. Takegawa, Y. Kondo, H. Hashioka, H. Matsui, A. Shimizu, and N. Sugimoto, Case study of absorption aerosol optical depth closure of black carbon over the East China Sea, Journal of Geophysical Research: Atmospheres, 119(1), 122-136, doi:10.1002/2013jd020163,2014.
  40. Khatri, P., T. Takamura, A. Shimizu, and N. Sugimoto, Observation of low single scattering albedo of aerosols in the downwind of the East Asian desert and urban areas during the inflow of dust aerosols, Journal of Geophysical Research: Atmospheres, 119(2), 787-802, doi:10.1002/2013jd019961,2014a.
  41. Khatri, P., T. Takamura, A. Yamazaki, and A. Uchiyama, Use of 315 nm Channel Data of the Sky Radiometer to Estimate the Columnar Ozone Concentration: A Preliminary Study, Journal of the Meteorological Society of Japan. Ser. II, 92A(0), 185-194, doi:10.2151/jmsj.2014-A12,2014b.
  42. Ningombam, S. S., S. P. Bagare, R. B. Singh, M. Campanelli, P. Khatri, and N. Dorjey, Calibration of a Sky radiometer (Prede) using observations obtained from Hanle and Merak high-altitude stations in Ladakh, Atmospheric Research, 143, 118-128, doi:10.1016/j.atmosres.2014.02.009,2014.
  43. Wang, Z., D. Liu, Z. Wang, Y. Wang, P. Khatri, J. Zhou, T. Takamura, and G. Shi, Seasonal characteristics of aerosol optical properties at the SKYNET Hefei site (31.90°N, 117.17°E) from 2007 to 2013, Journal of Geophysical Research: Atmospheres, 119(10), 6128-6139, doi:10.1002/2014jd021500,2014.
  44. Dim, J. R., T. Takamura, A. Higurashi, P. Khatri, N. Kikuchi, and T. Y. Nakajima, Validation of Two MODIS Aerosols Algorithms with SKYNET and Prospects for Future Climate Satellites Such as the GCOM-C/SGLI, Advances in Meteorology, 2013, 1-16, doi:10.1155/2013/508064,2013.
  45. Hashimoto, M., T. Nakajima, O. Dubovik, M. Campanelli, H. Che, P. Khatri, T. Takamura, and G. Pandithurai, Development of a new data-processing method for SKYNET sky radiometer observations, Atmospheric Measurement Techniques, 5(11), 2723-2737, doi:10.5194/amt-5-2723-2012,2012.
  46. Khatri, P., T. Takamura, A. Yamazaki, and Y. Kondo, Retrieval of Key Aerosol Optical Parameters from Spectral Direct and Diffuse Irradiances Observed by a Radiometer with Nonideal Cosine Response Characteristic, Journal of Atmospheric and Oceanic Technology, 29(5), 683-696, doi:10.1175/jtech-d-11-00111.1,2012.
  47. Liu, Y., J. Huang, G. Shi, T. Takamura, P. Khatri, J. Bi, J. Shi, T. Wang, X. Wang, and B. Zhang, Aerosol optical properties and radiative effect determined from sky-radiometer over Loess Plateau of Northwest China, Atmospheric Chemistry and Physics, 11(22), 11455-11463, doi:10.5194/acp-11-11455-2011,2011.
  48. Khatri, P., T. Takamura, A. Shimizu, and N. Sugimoto, Spectral Dependency of Aerosol Light-Absorption over the East China Sea Region, Sola, 6, 1-4, doi:10.2151/sola.2010-001,2010.
  49. Khatri, P., and T. Takamura, An Algorithm to Screen Cloud-Affected Data for Sky Radiometer Data Analysis, Journal of the Meteorological Society of Japan, 87(1), 189-204, doi:10.2151/jmsj.87.189,2009.
  50. Khatri, P., Y. Ishizaka, and T. Takamura, A Study on Aerosol Optical Properties in an Urban Atmosphere of Nagoya, Japan, Journal of the Meteorological Society of Japan, 87(1), 19-38, doi:10.2151/jmsj.87.19,2009.
  51. Khatri, P., and Y. Ishizaka, Effects of Continentally Polluted Airmass on Aerosol Optical Properties over the East China Sea, Journal of the Meteorological Society of Japan, 85, 47-68, doi:https://doi.org/10.2151/jmsj.85.47,2007.
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