Revisiting Online and Offline Data Assimilation Comparison for Paleoclimate Reconstruction: An Idealized OSSE Study

Atsushi Okazaki, Takemasa Miyoshi, Kei Yoshimura, Steven J. Greybush, Fuqing Zhang

Journal of Geophysical Research: Atmospheres   126 ( 16 )   2021.8

Oversampling Reflectivity Observations From a Geostationary Precipitation Radar Satellite: Impact on Typhoon Forecasts Within a Perfect Model OSSE Framework

James Taylor, Atsushi Okazaki, Takumi Honda, Shunji Kotsuki, Moeka Yamaji, Takuji Kubota, Riko Oki, Toshio Iguchi, Takemasa Miyoshi

Journal of Advances in Modeling Earth Systems   13 ( 7 )   2021.7

Activity report of the research group on evolving socio-hydrological studies in Japan

Kimura Masaomi, Nakamura Shinichiro, Okazaki Atsushi, Doi Sachiko, Nishihara Yukinaga, Yamazaki Dai, Watanabe Satoshi

Proceeding of Annual Conference   34 ( 0 )   146   2021

Weight structure of the Local Ensemble Transform Kalman Filter: A case with an intermediate atmospheric general circulation model

Shunji Kotsuki, Andrew Pensoneault, Atsushi Okazaki, Takemasa Miyoshi

Quarterly Journal of the Royal Meteorological Society   2020.8

COMPARATIVE STUDY TOWARDS MILLENNIUM REANALYSIS BY DATA ASSIMILATION USING ISOTOPE RATIOS OF PROXIES

Satoru SHOJI, Atsushi OKAZAKI, Kei YOSHIMURA

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   76 ( 2 )   I_121 - I_126   2020

Global Evaluation of Proxy System Models for Stable Water Isotopes With Realistic Atmospheric Forcing

Atsushi Okazaki, Kei Yoshimura

Journal of Geophysical Research: Atmospheres   124 ( 16 )   8972 - 8993   2019.8

Simulating precipitation radar observations from a geostationary satellite

Atsushi Okazaki, Takumi Honda, Shunji Kotsuki, Moeka Yamaji, Takuji Kubota, Riko Oki, Toshio Iguchi, Takemasa Miyoshi

Atmospheric Measurement Techniques   12 ( 7 )   3985 - 3996   2019.7

STUDY ON SPATIOTEMPORAL CHARACTERISTIC OF OBSERVATION IMPACT IN PROXY DATA ASSIMILATION

Satoru SHOJI, Atsushi OKAZAKI, Kei YOSHIMURA

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   74 ( 5 )   I_49 - I_54   2018

Comparing proxy and model estimates of hydroclimate variability and change over the Common Era

Jason E. Smerdon, Juerg Luterbacher, Steven J. Phipps, Kevin J. Anchukaitis, Toby Ault, Sloan Coats, Kim M. Cobb, Benjamin I. Cook, Chris Colose, Thomas Felis, Ailie Gallant, Johann H. Jungclaus, Bronwen Konecky, Allegra LeGrande, Sophie Lewis, Alex S. Lopatka, Wenmin Man, Justin S. Mankin, Justin T. Maxwell, Bette L. Otto-Bliesner, Judson W. Partin, Deepti Singh, Nathan J. Steiger, Samantha Stevenson, Jessica E. Tierney, Davide Zanchettin, Huan Zhang, Alyssa R. Atwood, Laia Andreu-Hayles, Seung H. Baek, Brendan Buckley, Edward R. Cook, Rosanne D'Arrigo, Sylvia G. Dee, Michael L. Griffiths, Charuta Kulkarni, Yochanan Kushnir, Flavio Lehner, Caroline Leland, Hans W. Linderholm, Atsushi Okazaki, Jonathan Palmer, Eduardo Piovano, Christoph C. Raible, Mukund P. Rao, Jacob Scheff, Gavin A. Schmidt, Richard Seager, Martin Widmann, A. Park Williams, Elena Xoplaki

CLIMATE OF THE PAST   13 ( 12 )   1851 - 1900   2017.12

Development and evaluation of a system of proxy data assimilation for paleoclimate reconstruction

Atsushi Okazaki, Kei Yoshimura

CLIMATE OF THE PAST   13 ( 4 )   379 - 393   2017.4

Understanding the variability of water isotopologues in near-surface atmospheric moisture over a humid subtropical rice paddy in Tsukuba, Japan

Wei Zhongwang, Kei Yoshimura, Atsushi Okazaki, Keisuke Ono, Wonsik Kim, Masaharu Yokoi, Chun-Ta Lai

JOURNAL OF HYDROLOGY   533   91 - 102   2016.2

Partitioning of evapotranspiration using high-frequency water vapor isotopic measurement over a rice paddy field

Zhongwang Wei, Kei Yoshimura, Atsushi Okazaki, Wonsik Kim, Zhongfang Liu, Masaharu Yokoi

WATER RESOURCES RESEARCH   51 ( 5 )   3716 - 3729   2015.5

Interannual variability of isotopic composition in water vapor over western Africa and its relationship to ENSO

A. Okazaki, Y. Satoh, G. Tremoy, F. Vimeux, R. Scheepmaker, K. Yoshimura

ATMOSPHERIC CHEMISTRY AND PHYSICS   15 ( 6 )   3193 - 3204   2015

INVESTIGATING VEGETATION-ATMOSPHERE WATER EXCHANGE BY USING HIGH FREQUENCY SPECTROSCOPY VAPOR ISOTOPE OBSERVATIONS

Zhongwang WEI, Atsushi OKAZAKI, Hidetoshi MAEDA, Yusuke SATOH, Masashi KIGUCHI, Keigo NODA, Masahiro KOIKE, Wonsik KIM, Zhongfang LIU, Kei YOSHIMURA

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   70 ( 4 )   I_181 - I_186   2014

Development of isotope enabled general circulation model and its response to the surface isotopic condition

OKAZAKI ATSUSHI, YOSHIMURA KEI

Proceeding of Annual Conference   27   100002 - 100002   2014

Changes in Flood Risk under Global Warming Estimated Using MIROC5 and the Discharge Probability Index

Atsushi Okazaki, Pat J. -F. Yeh, Kei Yoshimura, Masahiro Watanabe, Masahide Kimoto, Taikan Oki

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN   90 ( 4 )   509 - 524   2012.8