Simultaneous retrievals of aerosols and clouds, aerosol indirect effect investigation, and validation of Himawari 8 products

• Project/Area Number: 17K05650
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Tohoku University
• Principal Investigator: KHATRI PRADEEP 東北大学, 理学研究科, 講師 (80377986)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 雲 / エアロゾル / 光学的厚さ / 有効半径 / アルゴリズム開発 / 衛星雲プロダクット検証 / 地上観測 / 検証 / ひまわり８号 / スカイラジオメーター / 衛星雲プロダクトの検証 / 衛星観測 / 衛星 / アルゴリズム / 間接効果 / ひまわり8号

Outline of Final Research Achievements

An algorithm to retrieve cloud optical thickness (COD) and cloud-particle effective radius (CER) for both water and ice clouds from surface observed spectral zenith radiance by a ground-based sky radiometer was developed. The effects of several factors, including aerosols, on retrieved parameters were evaluated. Except for thin clouds (COD < 15), the retrieval errors are very small for both COD and CER. The proposed algorithm was used to estimate COD and CER of high temporal resolution. Those data were then used to study cloud properties of different sites and seasons of different aerosol backgrounds as well as to validate satellite cloud products.

Academic Significance and Societal Importance of the Research Achievements

雲は気候システムに重要な役割を果たしています。しかし、その雲の時空間変動が大きく、気候変動に関する政府間パネル（IPCC）第６次報告書等にも明記されているように、その雲は気候変動予測における最大の不確実要素の一つとなっている。このような中、本研究の成果は特に、地上測機による新規な雲観測技術の開発とその地上観測資料を用いた衛星雲プロダクットの精度評価は、雲特性のより正確な理解のため波及効果をもたらすことを期待される。

Research Products

• [Journal Article] Air Quality Improvement during COVID-19 Lockdown in Bangkok Metropolitan, Thailand: Effect of the Long-range Transport of Air Pollutants (2021)
  • Author(s): Parchichat W.、T. Hayaska、and P. Khatri
  • Journal Title: Aerosol and Air Quality Research Volume: 21 Issue: 7 Pages: 200662-200662
  • DOI: 10.4209/aaqr.200662
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Nitrogen Oxides Concentration and Emission change detection during COVID-19 restrictions in North India (2021)
  • Author(s): Misra et al.
  • Journal Title: Scientific Reports Volume: - Issue: 1
  • DOI: 10.1038/s41598-021-87673-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An overview of and issues with sky radiometer technology and SKYNET (2020)
  • Author(s): Nakajima T., Campanelli M., Che H., Estells V., Irie H., Kim S., Kim J., Liu D., Nishizawa T., Pandithurai G., Soni V. K., Thana B., Tugjsurn N., Aoki K., Go S., Higurashi A., Kazadzis S., Khatri P., Kouremeti N., Kudo R., Marenco F., Momoi M., Ningombam S. S., Ryder C. L., Uchiyama A
  • Journal Title: Atmos. Meas. Tech. Volume: 13 Issue: 8 Pages: 4195-4218
  • DOI: 10.5194/amt-13-4195-2020
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Investigating Aerosol Effects on Maritime Deep Convective Clouds Using Satellite and Reanalysis Data (2020)
  • Author(s): Khatri P., H. Ooashi, and H. Iwabuchi
  • Journal Title: SOLA Volume: 16 Issue: 0 Pages: 228-232
  • DOI: 10.2151/sola.2020-038
  • NAID: 130007950587
• [Journal Article] Comparison of three aerosol representations of NHM-Chem (v1.0) for the simulations of air quality and climate-relevant variables (2020)
  • Author(s): Kajino Mizuo、Deushi Makoto、Sekiyama Tsuyoshi Thomas、and co-authors
  • Journal Title: Geoscientific Model Development Volume: 14 Pages: 225-2264
  • DOI: 10.5194/gmd-2020-229
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High-resolution retrieval of cloud microphysical properties and surface solar radiation using Himawari-8/AHI next-generation geostationary satellite (2020)
  • Author(s): 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
  • Journal Title: Remote Sensing of Environment Volume: 239 Pages: 111583-111583
  • DOI: 10.1016/j.rse.2019.111583
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Retrieval of cloud properties from spectral zenith radiances observed by sky radiometers (2019)
  • Author(s): Pradeep Khatri, Hironobu Iwabuchi, Tadahiro Hayasaka, Hitoshi Irie, Tamio Takamura, Akihiro Yamazaki, Alessandro Damiani, Husi Letu, and Qin Kai
  • Journal Title: Atmospheric Measurement Techniques Volume: 12 Issue: 11 Pages: 6037-6047
  • DOI: 10.5194/amt-12-6037-2019
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An Intensive Campaign-Based Intercomparison of Cloud Optical Depth from Ground and Satellite Instruments under Overcast Conditions (2019)
  • Author(s): Alessandro Damiani, Hitoshi Irie, Tamio Takamura, Rei Kudo, Pradeep Khatri, Hironobu Iwabuchi, Ryosuke Masuda, and Takashi Nagao
  • Journal Title: SOLA Volume: 15 Issue: 0 Pages: 198-204
  • DOI: 10.2151/sola.2019-036
  • NAID: 130007719630
  • ISSN: 1349-6476
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Simultaneous observations by sky radiometer and MAX-DOAS for characterization of biomass burning plumes in central Thailand in January-April 2016 (2019)
  • Author(s): Hitoshi Irie, Hossain Mohammed Syedul Hoque, Alessandro Damiani, Hiroshi Okamoto, Al Mashroor Fatmi, Pradeep Khatri, Tamio Takamura, and Thanawat Jarupongsaku
  • Journal Title: Atmospheric Measurement Techniques Volume: 12 Issue: 1 Pages: 599-606
  • DOI: 10.5194/amt-12-599-2019
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Vertical Profiles of Ice Cloud Microphysical Properties and Their Impacts on Cloud Retrieval Using Thermal Infrared Measurements (2018)
  • Author(s): Pradeep Khatri, Hironobu Iwabuchi, and Masanori Saito
  • Journal Title: Journal of Geophysical Research:Atmospheres Volume: 123 Issue: 10 Pages: 5301-5319
  • DOI: 10.1029/2017jd028165
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Validation of MODIS and AHI Observed Water Cloud Properties Using Surface Radiation Data (2018)
  • Author(s): Pradeep Khatri, Tadahiro Hayasaka, Hironobu Iwabuchi, Tamio Takamura, Hitoshi Irie, Takashi Y. Nakajima
  • Journal Title: Journal of the Meteorological Society of Japan. Ser. II Volume: 96B Issue: 0 Pages: 151-172
  • DOI: 10.2151/jmsj.2018-036
  • NAID: 130007485220
  • ISSN: 0026-1165, 2186-9057
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Evaluation of Himawari-8 surface downwelling solar radiation by SKYNET observations (2018)
  • Author(s): Alessandro Damiani, Hitoshi Irie, Takashi Horio, Tamio Takamura, Pradeep Khatri, Hideki Takenaka, Takashi Nagao, Takashi Y. Nakajima, and Raul R. Cordero
  • Journal Title: Atmospheric Measurement Techniques Volume: -
  • DOI: 10.5194/amt-2017-440
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Comparisons of spectral aerosol absorption in Seoul, South Korea (2018)
  • Author(s): Jungbin Mok, Nickolay A. Krotkov, Omar Torres, Hiren Jethva, Zhanqing Li, Jhoon Kim, Ja-Ho Koo, Sujung Go, Hitoshi Irie, Gordon Labow, Thomas F. Eck, Brent N. Holben, Jay Herman, Robert P. Loughman, Elena Spinei, Seoung Soo Lee, Pradeep Khatri, and Monica Campanelli
  • Journal Title: Atmospheric Measurement Techniques Volume: -
  • DOI: 10.5194/amt-2017-380
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Validation results of SGLI cloud and radiation budget products (2021)
  • Author(s): Khatri, P., T. Hayasaka, H. Irie, and T. Takamura
  • Organizer: Joint PI Meeting of Global Environment Observation Mission
  • Int'l Joint Research
• [Presentation] Facts learned from COVID-19 lockdown; which pollution sector is affected the most?, (2020)
  • Author(s): Khatri, P.
  • Organizer: 5th International conference on mountains in the changing world
  • Int'l Joint Research / Invited
• [Presentation] Studies of aerosols, ozone, and clouds from sky radiometer: Algorithms and observation results (2020)
  • Author(s): Khatri, P
  • Organizer: Aerosol air quality, climate change and impact on water resources and livelihoods in greater Himalaya
  • Int'l Joint Research / Invited
• [Presentation] Air pollution status over China during lockdown caused by COVID-19 (2020)
  • Author(s): Khatri, P. and T. Hayasaka
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] Quality assessment of SGLI/GCOM-C observed cloud properties by surface observation data (2020)
  • Author(s): Khatri, P., T. Hayasaka, H. Irie, and T. Takamura
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] Kodai Yamaguchi, Hitoshi Irie, Pradeep Khatri, Toshihiko Takemura, Hirokazu Yamamoto (2019)
  • Author(s): Kodai Yamaguchi, Hitoshi Irie, Pradeep Khatri, Toshihiko Takemura, Hirokazu Yamamoto
  • Organizer: Japan Geosience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Observations of aerosol optical properties by sky radiometers at SKYNET Southeast and South Asian sites (2019)
  • Author(s): Al Mashroor Fatmi, Hitoshi Irie, Hossain Mohammed Syedul Hoque, Alessandro Damiani, Pradeep Khatri, Tamio Takamura, Thanawat Jurupongsaku, Govindan Pandithurai
  • Organizer: Japan Geosience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Cloud optical properties from various ground and satellite instruments evaluated during an intensive campaign (2019)
  • Author(s): Alessandro Damiani, Hitoshi Irie, Takashi Horio, Tamio Takamura, Rei Kudo, Pradeep Khatri, Hironobu Iwabuchi, Ryosuke Masuda, Takashi M. Nagao
  • Organizer: Japan Geosience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] スカイラジオメーターを用いた日本におけるエアロゾルの光吸収オ ングストローム指数の変動要因の解析 (2019)
  • Author(s): 山口航大, 入江仁士, P. Khatri, 竹村俊彦、山本浩万
  • Organizer: 気象学会2019年度秋季大会
• [Presentation] Cloud remote sensing using ground-based sky radiometer: Towards generating high-resolution data and satellite product validation (2019)
  • Author(s): P.Khatri, H. Iwabuchi, T Hayasaka, H. Irie, T. Takamura, A. Yamazaki, A. Damiani, H. Letu, and Q. Kai
  • Organizer: P.Khatri, H. Iwabuchi, T Hayasaka, H. Irie, T. Takamura, A. Yamazaki, A. Damiani, H. Letu, and Q. Kai
  • Int'l Joint Research / Invited
• [Presentation] Aerosol and cloud properties over Japan studied by using a ground-based sky radiometer (2019)
  • Author(s): Pradeep Khatri
  • Organizer: International Symposium on Surveying and Big Remote Sensing Data
• [Presentation] 不均質に分布した雲の地上リモートセンシング手法の開発 (2019)
  • Author(s): 工藤玲, 岩渕弘信,鷹野敏明, 入江仁士, Alessandro Damiani, Pradeep Khatri
  • Organizer: 気象学会2019年度秋季大会
• [Presentation] Analysis of factors causing variations in the Absorption Angstrom Exponent of aerosols in Japan using (2019)
  • Author(s): Kodai Yamaguchi, Hitoshi Irie, Toshihiko Takemura, Pradeep Khatri, Hirokazu Yamamoto
  • Organizer: AGU Fall meeting 2019
  • Int'l Joint Research
• [Presentation] Cloud Retrieval from SKYNET Sky Radiometer (2019)
  • Author(s): Pradeep Khatri, Hironobu Iwabuchi, Tadahiro Hayasaka, Hitoshi Irie, Tamio Takamura, Akihiro Yamazaki, and Alessandro Damiani
  • Organizer: 5th International SKYNET workshop
  • Int'l Joint Research
• [Presentation] Long-term trends of aerosol characteristics observed in south-western islands of Japan (2019)
  • Author(s): Tamio Takamura, Hitoshi Irie, and Pradeep Khatri
  • Organizer: 5th International SKYNET workshop
  • Int'l Joint Research
• [Presentation] Ice cloud vertical profiles and their roles on cloud retrievals using thermal infrared (2018)
  • Author(s): Pradeep Khatri, Hironobu Iwabuchi, and Masanori Saito
  • Organizer: 日本気象学会 2018年度秋季大会
• [Presentation] Inferring surface PM2.5 from satellite observation (2018)
  • Author(s): Pradeep Khatri and Tadahiro Hayasaka
  • Organizer: 日本気象学会 2018年度秋季大会
• [Presentation] Remote sensing of clouds from surface (2018)
  • Author(s): Pradeep Khatri
  • Organizer: 2018 ISPRS Workshop on Remote Sensing and Synergic Analysis on Atmospheric Environment
  • Int'l Joint Research
• [Presentation] Feasibility study of the predictions about the cross-border transport of aerosols/PM2.5 using the data assimilation with Himawari 8 data and NICAM-Chem model (2018)
  • Author(s): Takeshi Kuroda, Yasuko Kasai, Pradeep Khatri, Tadahiro Hayasaka, Daisuke Goto, Koji Zettsu
  • Organizer: 42nd COSPAR Scientific Assembly
  • Int'l Joint Research
• [Presentation] Data assimilation of the cross-border transport of aerosols/PM2.5 using Himawari 8 data and NICAM-Chem model (2018)
  • Author(s): Takeshi Kuroda, Pradeep Khatri, Tadahiro Hayasaka, Daisuke Goto, Yasuko Kasai, and Koji Zettsu,
  • Organizer: 2018 joint 14th iCACGP Symposium and 15th IGAC Science Conference
  • Int'l Joint Research
• [Presentation] Long-term trend of aerosol radiative effects in the SKYNET observation using monthly mean AOT and SSA at the sites of Chiba, Fukue-jima, Cape Hedo and Miyako-jima (2018)
  • Author(s): Tamio Takamura, Hitoshi Irie, and Pradeep Khatri
  • Organizer: 国立環境研究所シンポジウム「東アジアの越境大気汚染」
• [Presentation] Evaluation of AMATERASS surface solar radiation with ground-based observations in Japan (2018)
  • Author(s): Alessandro Damiani, Hitoshi Irie, Horio T., T. Takamura, P. Khatri, H. Takenaka, T. Nagao, T. Y. Nakajima, and R. R. Cordero
  • Organizer: 日本地球惑星科学連合大会
• [Presentation] Ground-based pyranometer observations and their application through Himawari-8 validation toward EMS (2018)
  • Author(s): Horio, T., H. Irie, A. Damiani, T. Nakajima, H. Takenaka, P. Khatri, and T. Takamura
  • Organizer: 日本 地球惑星科学連合大会
• [Presentation] Multi-component observations of biomass burning plumes by MAX-DOAS and sky radiometer at Phimai, Thailand in the dry season of 2016 (2018)
  • Author(s): Irie, H., H. M. S. Hoque, A. Damiani, H. Okamoto, A. M. Fatmi, P. Khatri, K. Sudo, and T. Takamura
  • Organizer: 2018 joint 14th iCACGP Quadrennial Symposium and 15th IGAC Science Conference
  • Int'l Joint Research
• [Presentation] Parameterization of Cirrus Cloud Vertical Profiles and Geometrical Thickness Using CALIPSO and CloudSat Data (2017)
  • Author(s): Pradeep Khatri, Hironobu Iwabuchi, and Masanori Saito
  • Organizer: American Geophysical Union 2017
  • Int'l Joint Research
• [Presentation] An improved cloud properties retrieval method from the sky radiometer (2017)
  • Author(s): Pradeep Khatri, Tadahiro Hayasaka,Hironobu Iwabuchi, Hitoshi Irie, and Tamio Takamura
  • Organizer: 日本気象学会 2017 年度秋季大会
• [Presentation] Validation of Himawari-8 and MODIS observed water cloud microphysical and optical properties using ground-based observation data (2017)
  • Author(s): Pradeep Khatri, Tadahiro Hayasaka,Hironobu Iwabuchi, Hitoshi Irie, and Kazuaki Kawamoto
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research