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个人简介
Yaga’s areas of expertise and scientific interests include gravity waves and their parameterizations in global climate models, middle atmospheric dynamics, quasi-biennial oscillation (QBO), whole atmosphere climate modeling, subseasonal-to-seasonal prediction, and geoengineering. Yaga has developed the first source spectrum parameterization of convectively generated gravity waves for climate models and has changed the parameterization of gravity waves in the Whole Atmosphere Community Climate Model (WACCM) to be entirely source-based. Yaga implemented a convective momentum transport parameterization in the Community Atmosphere Model (CAM) which has significantly improved the representation of El Nino Southern Oscillation, and with her work on gravity waves and vertical resolution, she was able to obtain a very realistic QBO in the NCAR CAM and WACCM.
Yaga has pioneered the development of the subseasonal-to-seasonal (S2S) prediction research framework with the Community Earth System Model (CESM) and co-leads the CESM Earth System Prediction Working Group (ESPWG). The first study utilizing two versions of CESM1 (one with and one without a well-resolved stratosphere) showed surprisingly that overall surface prediction skill on the subseasonal time-scale was not improved by the inclusion of a better-resolved stratosphere. The surface prediction skill of CESM2(WACCM) is also very similar to that of CESM2(CAM), suggesting that on subseasonal time-scales other factors might be more important to surface prediction than the stratosphere, or because models underestimate teleconnections, the benefits of a well-resolved stratosphere are not realized. S2S prediction systems with CESM2(CAM6) and CESM2(WACCM6) run now in real-time and contribute the week 3-4 forecast to the NOAA experimental weeks 3-4 outlook.
Yaga has led or co-led climate intervention or geoengineering research efforts at NCAR since 2015. The efforts have been centered on examining the effects of sulfur dioxide (SO2) injections on the troposphere and stratosphere in CESM with WACCM as it’s atmospheric component. This research has led to the development of the Geoengineering Large Ensemble (GLENS) which provides a community dataset for evaluation of impacts of geoengineering using stratospheric aerosols. In 2021, Yaga began leading a new set of climate intervention simulations with CESM2(WACCM) in support of the Solar Climate Research Initiative supported by SilverLining NGO.
Yaga is the co-Pi of the DOE-NCAR Cooperative Agreement Cooperative Agreement To AnaLyze variability, change and predictabilitY in the earth SysTem (CATALYST). The CATALYST team performs foundational coordinated research in a team-oriented collaborative environment aimed at advancing a robust understanding of modes of Earth system variability and change using models, observations.
Current Research Projects
CATALYST: Cooperative Agreement To AnaLyze variability, change and predictabilitY in the earth SysTem
Sources of subseasonal-to-seasonal predictability
Climate intervention/geoengineering research using stratospheric aerosols
QBO-MJO connection
High vertical resolution modeling with CAM and WACCM
Quasi-biennial Oscillation Initiative (QBOi)
CESM (WACCM) development
Education & Outreach
Yaga has a longstanding passion for education and outreach to audiences of all levels. In graduate school, she was the outreach coordinator for the Department of Atmospheric Sciences at the University of Washington. While an ASP Postdoctoral Fellow she developed the “Climate and Weather: The Two Go Together” Girl Scouts program at NCAR, which a few years later became a part of the UCAR Center for Science Education. During this time she also taught Weather and Climate for teachers. Yaga also designed a “WeatherWise” badge program and kit for Girl Scouts while at CIRES/University of Colorado. More recently, Yaga led the development of the NCAR Explorer Series which now continues as an integral part of the NCAR Education and Outreach offerings.
Field of Expertise
Atmospheric Dynamics
Climate Science
Subseasonal prediction
Geoengineering/Climate Intervention
Specialty
Dynamics
Dynamics: Middle Atmosphere
Modeling: Global
Yaga has pioneered the development of the subseasonal-to-seasonal (S2S) prediction research framework with the Community Earth System Model (CESM) and co-leads the CESM Earth System Prediction Working Group (ESPWG). The first study utilizing two versions of CESM1 (one with and one without a well-resolved stratosphere) showed surprisingly that overall surface prediction skill on the subseasonal time-scale was not improved by the inclusion of a better-resolved stratosphere. The surface prediction skill of CESM2(WACCM) is also very similar to that of CESM2(CAM), suggesting that on subseasonal time-scales other factors might be more important to surface prediction than the stratosphere, or because models underestimate teleconnections, the benefits of a well-resolved stratosphere are not realized. S2S prediction systems with CESM2(CAM6) and CESM2(WACCM6) run now in real-time and contribute the week 3-4 forecast to the NOAA experimental weeks 3-4 outlook.
Yaga has led or co-led climate intervention or geoengineering research efforts at NCAR since 2015. The efforts have been centered on examining the effects of sulfur dioxide (SO2) injections on the troposphere and stratosphere in CESM with WACCM as it’s atmospheric component. This research has led to the development of the Geoengineering Large Ensemble (GLENS) which provides a community dataset for evaluation of impacts of geoengineering using stratospheric aerosols. In 2021, Yaga began leading a new set of climate intervention simulations with CESM2(WACCM) in support of the Solar Climate Research Initiative supported by SilverLining NGO.
Yaga is the co-Pi of the DOE-NCAR Cooperative Agreement Cooperative Agreement To AnaLyze variability, change and predictabilitY in the earth SysTem (CATALYST). The CATALYST team performs foundational coordinated research in a team-oriented collaborative environment aimed at advancing a robust understanding of modes of Earth system variability and change using models, observations.
Current Research Projects
CATALYST: Cooperative Agreement To AnaLyze variability, change and predictabilitY in the earth SysTem
Sources of subseasonal-to-seasonal predictability
Climate intervention/geoengineering research using stratospheric aerosols
QBO-MJO connection
High vertical resolution modeling with CAM and WACCM
Quasi-biennial Oscillation Initiative (QBOi)
CESM (WACCM) development
Education & Outreach
Yaga has a longstanding passion for education and outreach to audiences of all levels. In graduate school, she was the outreach coordinator for the Department of Atmospheric Sciences at the University of Washington. While an ASP Postdoctoral Fellow she developed the “Climate and Weather: The Two Go Together” Girl Scouts program at NCAR, which a few years later became a part of the UCAR Center for Science Education. During this time she also taught Weather and Climate for teachers. Yaga also designed a “WeatherWise” badge program and kit for Girl Scouts while at CIRES/University of Colorado. More recently, Yaga led the development of the NCAR Explorer Series which now continues as an integral part of the NCAR Education and Outreach offerings.
Field of Expertise
Atmospheric Dynamics
Climate Science
Subseasonal prediction
Geoengineering/Climate Intervention
Specialty
Dynamics
Dynamics: Middle Atmosphere
Modeling: Global
研究兴趣
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Stefanie Kremser,Andrew Charlton-Perez,Jadwiga H. Richter, Jose Santos,Julia Danzer, Stefanie Hoelbling
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETYno. 1 (2024): E2336-E2346
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Atmospheric Chemistry and Physicsno. 1 (2023): 687-709
GEOPHYSICAL RESEARCH LETTERSno. 8 (2023)
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