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A Machine Learning Approach to the Observation Operator for Satellite Radiance Data Assimilation 卫星辐射数据同化观测算子的机器学习方法
4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2023-01-01 DOI: 10.2151/jmsj.2023-005
Jianyu LIANG, Koji TERASAKI, Takemasa MIYOSHI
{"title":"A Machine Learning Approach to the Observation Operator for Satellite Radiance Data Assimilation","authors":"Jianyu LIANG, Koji TERASAKI, Takemasa MIYOSHI","doi":"10.2151/jmsj.2023-005","DOIUrl":"https://doi.org/10.2151/jmsj.2023-005","url":null,"abstract":"The observation operator (OO) is essential in data assimilation (DA) to derive the model equivalent of observations from the model variables. In the satellite DA, the OO for satellite microwave brightness temperature (BT) is usually based on the radiative transfer model (RTM) with a bias correction procedure. To explore the possibility to obtain OO without using physically based RTM, this study applied machine learning (ML) as OO (MLOO) to assimilate BT from Advanced Microwave Sounding Unit-A (AMSU-A) channels 6 and 7 over oceans and channel 8 over both land and oceans under clear-sky conditions. We used a reference system, consisting of the nonhydrostatic icosahedral atmospheric model (NICAM) and the local ensemble transform Kalman filter (LETKF). The radiative transfer for TOVS (RTTOV) was implemented in the system as OO, combined with a separate bias correction procedure (RTTOV-OO). The DA experiment was performed for 1 month to assimilate conventional observations and BT using the reference system. Model forecasts from the experiment were paired with observations for training the ML models to obtain ML-OO. In addition, three DA experiments were conducted, which revealed that DA of the conventional observations and BT using ML-OO was slightly inferior, compared to that of RTTOV-OO, but it was better than the assimilation based on only conventional observations. Moreover, ML-OO treated bias internally, thereby simplifying the overall system framework. The proposed ML-OO has limitations due to (1) the inability to treat bias realistically when a significant change is present in the satellite characteristics, (2) inapplicability for many channels, (3) deteriorated performance, compared with that of RTTOV-OO with respect to accuracy and computational speed, and (4) physically based RTM is still used to train the ML-OO. Future studies can alleviate these drawbacks, thereby improving the proposed ML-OO.","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136367735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Predictability Associated with High-Latitude Retrograde Waves in the 1979-80 Winter Season 1979- 1980年冬季高纬度逆行波的可预测性
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2022-01-01 DOI: 10.2151/JMSJ.2022-012
Huang Huei-Ping, Raghunathan Girish Nigamanth
{"title":"Predictability Associated with High-Latitude Retrograde Waves in the 1979-80 Winter Season","authors":"Huang Huei-Ping, Raghunathan Girish Nigamanth","doi":"10.2151/JMSJ.2022-012","DOIUrl":"https://doi.org/10.2151/JMSJ.2022-012","url":null,"abstract":"Retrograde long waves in the higher latitudes of the Northern Hemisphere can episodically attain large amplitudes and sustain coherent phase propagation for 2 – 3 weeks. The potential influence of such waves on extended-range weather forecast has been conjectured but not systematically quantified. Using a set of ensemble reforecast data, this study examined the predictability associated with an extraordinary retrograde-wave episode in the 1979 – 80 winter. Quantified by the anomaly correlation of the 500 hPa geopotential height in the 40 – 70°N latitudi nal band, increased week-2 predictability was found within the subperiod with the presence of coherent retrograde waves. Some individual forecasts made within the retrograde-wave event exhibited the behavior of “return of skills”. The results suggest a future investigation into the relation between the elevated level of anomaly correlation in week-2 and detailed dynamics of the retrograde waves.","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68296285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Different Future Changes between Early and Late Summer Monsoon Precipitation in East Asia 东亚夏初和夏末风降水的未来变化
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-09-01 DOI: 10.2151/JMSJ.2021-073
H. Endo, A. Kitoh, R. Mizuta, T. Ose
{"title":"Different Future Changes between Early and Late Summer Monsoon Precipitation in East Asia","authors":"H. Endo, A. Kitoh, R. Mizuta, T. Ose","doi":"10.2151/JMSJ.2021-073","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-073","url":null,"abstract":"","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42011282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Application of a Nudged General Circulation Model to the Interpretation of the Mean Age of Air Derived from Stratospheric Samples in the Tropics Nudged环流模型在解释热带平流层样本空气平均年龄中的应用
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-05-20 DOI: 10.2151/JMSJ.2021-056
T. H. Nguyen, K. Ishijima, S. Sugawara, F. Hasebe
{"title":"Application of a Nudged General Circulation Model to the Interpretation of the Mean Age of Air Derived from Stratospheric Samples in the Tropics","authors":"T. H. Nguyen, K. Ishijima, S. Sugawara, F. Hasebe","doi":"10.2151/JMSJ.2021-056","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-056","url":null,"abstract":"","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47633819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A 1D Bayesian Inversion Applied to GPM Microwave Imager Observations: Sensitivity Studies 一维贝叶斯反演应用于GPM微波成像仪观测:灵敏度研究
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-04-30 DOI: 10.2151/JMSJ.2021-050
Marylis Barreyat, P. Chambon, J. Mahfouf, G. Faure, Yasutaka Ikuta
{"title":"A 1D Bayesian Inversion Applied to GPM Microwave Imager Observations: Sensitivity Studies","authors":"Marylis Barreyat, P. Chambon, J. Mahfouf, G. Faure, Yasutaka Ikuta","doi":"10.2151/JMSJ.2021-050","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-050","url":null,"abstract":"","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43922808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Precipitation Processes of a Thunderstorm Occurred on 19 August 2014 in Northern Taiwan Documented by Using a High Resolution 4DVar Data Assimilation System 利用高分辨率4DVar同化系统记录2014年8月19日台湾北部一次雷暴降水过程
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-04-20 DOI: 10.2151/JMSJ.2021-049
Yinglu Wu, Yu‐Chieng Liou, Yi-Chuan Lo, S. Tai, Shao-Fan Chang, Juanzhen Sun
{"title":"Precipitation Processes of a Thunderstorm Occurred on 19 August 2014 in Northern Taiwan Documented by Using a High Resolution 4DVar Data Assimilation System","authors":"Yinglu Wu, Yu‐Chieng Liou, Yi-Chuan Lo, S. Tai, Shao-Fan Chang, Juanzhen Sun","doi":"10.2151/JMSJ.2021-049","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-049","url":null,"abstract":"","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46489927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Statistical Intercomparison of Similarity Metrics in Sea Level Pressure Pattern Classification 海平面压力模式分类中相似度量的统计相互比较
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-04-14 DOI: 10.2151/JMSJ.2021-047
Takuto Sato, H. Kusaka
{"title":"Statistical Intercomparison of Similarity Metrics in Sea Level Pressure Pattern Classification","authors":"Takuto Sato, H. Kusaka","doi":"10.2151/JMSJ.2021-047","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-047","url":null,"abstract":"","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45749996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Prediction Skill of the Boreal Summer Intra-Seasonal Oscillation in Global Non-hydrostatic Atmospheric Model Simulations with Explicit Cloud Microphysics 显式云微物理全球非静力大气模式模拟中北夏季季内振荡的预测技巧
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-04-08 DOI: 10.2151/JMSJ.2021-046
R. Shibuya, M. Nakano, C. Kodama, T. Nasuno, K. Kikuchi, M. Satoh, H. Miura, T. Miyakawa
{"title":"Prediction Skill of the Boreal Summer Intra-Seasonal Oscillation in Global Non-hydrostatic Atmospheric Model Simulations with Explicit Cloud Microphysics","authors":"R. Shibuya, M. Nakano, C. Kodama, T. Nasuno, K. Kikuchi, M. Satoh, H. Miura, T. Miyakawa","doi":"10.2151/JMSJ.2021-046","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-046","url":null,"abstract":"","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44191107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
The Boreal Summer Intraseasonal Oscillation (BSISO): A Review 北方夏季季内振荡(BSISO):综述
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-03-30 DOI: 10.2151/JMSJ.2021-045
K. Kikuchi
{"title":"The Boreal Summer Intraseasonal Oscillation (BSISO): A Review","authors":"K. Kikuchi","doi":"10.2151/JMSJ.2021-045","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-045","url":null,"abstract":"The boreal summer intraseasonal oscillation (BSISO) is among the most pronounced subseasonal variability in the tropics during boreal summer. Compared with its wintertime counterpart, the so-called Madden–Julian oscillation (MJO), the BSISO convection displays more complicated spatiotemporal evolution, characterized by northward propagation over the northern Indian Ocean and western North Pacific as well as eastward propagation along the equator. It exerts a strong effect on a broad range of tropical weather and climate phenomena, such as tropical cyclogenesis, monsoon onset, and active/break cycles, among others. Our fundamental understanding of the BSISO has steadily advanced: so far various aspects of the BSISO have been described, and several theories that aim to elucidate its northward propagation have been proposed. Yet, our skill to simulate the BSISO by gen - eral circulation models remains unsatisfactory, though it has been improved. This paper reviews some fundamen - tal aspects of the BSISO from the viewpoint of observation, theory, and modeling.","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47351028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
Kuroshio-Enhanced Convective Rainband Associated with an Extratropical Cyclone in the Cold Season 寒冷季节黑潮增强的对流雨带与一个温带气旋有关
IF 3.1 4区 地球科学
Journal of the Meteorological Society of Japan Pub Date : 2021-03-25 DOI: 10.2151/JMSJ.2021-043
Hidetaka Hirata, R. Kawamura, M. Nonaka, K. Tsuboki
{"title":"Kuroshio-Enhanced Convective Rainband Associated with an Extratropical Cyclone in the Cold Season","authors":"Hidetaka Hirata, R. Kawamura, M. Nonaka, K. Tsuboki","doi":"10.2151/JMSJ.2021-043","DOIUrl":"https://doi.org/10.2151/JMSJ.2021-043","url":null,"abstract":"","PeriodicalId":17476,"journal":{"name":"Journal of the Meteorological Society of Japan","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2021-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47736409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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