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Land and Ocean Contributions to United States Summertime Precipitation Variability
Land and Ocean Contributions to United States Summertime Precipitation Variability
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104733
- ISBN
- 9798290649122
- DDC
- 551.57
- 서명/저자
- Land and Ocean Contributions to United States Summertime Precipitation Variability
- 발행사항
- [Sl] : The Pennsylvania State University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 171 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Li, Laifang.
- 학위논문주기
- Thesis (Ph.D.)--The Pennsylvania State University, 2025.
- 초록/해제
- 요약Variability of summertime contiguous United States (US) precipitation is among the most important contributors to the environment, ecology, and economy of the country. As such, understanding the processes that govern precipitation variability is necessary to increase seasonal-to-subseasonal forecasting skill and future climate projections to make science-informed policy decisions. The dominant mode of this precipitation variability is a dipole pattern of opposing hydrological extremes between the Midwest (MW) and Southeast (SE) US. Years of increased MW precipitation coincide with years of decreased SE precipitation, and vice versa. This relationship has been well explored on interannual time scales but remains to be fully elucidated on intraseasonal time scales. Using a Bayesian statistical model, daily summertime precipitation in the MW and SE are independently classified as light, moderate, and heavy categories and then backtracked using a moisture tracking algorithm to determine the moisture origin points for the precipitation events. Results indicate that both regions are experiencing increasing trends in moderate and heavy precipitation event frequency, with light events becoming less frequent from 1970 to 2019. Light precipitation events rely on local moisture recycling and land-based moisture to fuel the events, whereas heavier precipitation events are supplemented by oceanic moisture pathways dynamically regulated by the North Atlantic Subtropical High (NASH) Western Ridge (WR). As the NASH WR shifts northwest of the climatological position, Atlantic Ocean moisture travels along the southern flank of the NASH, through the Caribbean Sea, into the Gulf of Mexico and funneled into the Great Plains Low-Level Jet (GPLLJ). The bolstered GPLLJ transports oceanic moisture to the MW US, which concurrently receives Pacific Ocean moisture through geopotential height anomalies that create favorable conditions for MW precipitation and unfavorable conditions for SE precipitation. The northwest expansion of the NASH WR reduces ocean moisture to the SE US, resulting in light precipitation events. Heavier SE US precipitation events occur as the NASH WR recedes southeast of climatology, resulting in the redirection of moisture from the GPLLJ and MW to the SE. Simultaneously, geopotential height anomalies create unfavorable conditions for MW precipitation and favorable conditions for SE precipitation events. The geopotential height anomalies that affect MW and SE US precipitation events are approximately 12-day impressions of the Asia-North America teleconnection pattern that yields anomalous barotropic wave trains from East Asian Summer Monsoon latent heating anomalies.
- 일반주제명
- Precipitation
- 일반주제명
- Drought
- 일반주제명
- Wind
- 일반주제명
- Floods
- 일반주제명
- Seasons
- 일반주제명
- Weather
- 일반주제명
- Regions
- 일반주제명
- Hydrology
- 일반주제명
- Eigenvalues
- 일반주제명
- 21st century
- 일반주제명
- Statistical significance
- 일반주제명
- Sampling error
- 일반주제명
- Summer
- 일반주제명
- Climate science
- 일반주제명
- Climate change
- 일반주제명
- Student's t-test
- 일반주제명
- Rain
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798290649122
■035 ▼a(MiAaPQ)AAI32148963
■035 ▼a(MiAaPQ)PennState29651cms8477
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.57
■1001 ▼aSala, Christopher M.
■24510▼aLand and Ocean Contributions to United States Summertime Precipitation Variability
■260 ▼a[Sl]▼bThe Pennsylvania State University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a171 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Li, Laifang.
■5021 ▼aThesis (Ph.D.)--The Pennsylvania State University, 2025.
■520 ▼aVariability of summertime contiguous United States (US) precipitation is among the most important contributors to the environment, ecology, and economy of the country. As such, understanding the processes that govern precipitation variability is necessary to increase seasonal-to-subseasonal forecasting skill and future climate projections to make science-informed policy decisions. The dominant mode of this precipitation variability is a dipole pattern of opposing hydrological extremes between the Midwest (MW) and Southeast (SE) US. Years of increased MW precipitation coincide with years of decreased SE precipitation, and vice versa. This relationship has been well explored on interannual time scales but remains to be fully elucidated on intraseasonal time scales. Using a Bayesian statistical model, daily summertime precipitation in the MW and SE are independently classified as light, moderate, and heavy categories and then backtracked using a moisture tracking algorithm to determine the moisture origin points for the precipitation events. Results indicate that both regions are experiencing increasing trends in moderate and heavy precipitation event frequency, with light events becoming less frequent from 1970 to 2019. Light precipitation events rely on local moisture recycling and land-based moisture to fuel the events, whereas heavier precipitation events are supplemented by oceanic moisture pathways dynamically regulated by the North Atlantic Subtropical High (NASH) Western Ridge (WR). As the NASH WR shifts northwest of the climatological position, Atlantic Ocean moisture travels along the southern flank of the NASH, through the Caribbean Sea, into the Gulf of Mexico and funneled into the Great Plains Low-Level Jet (GPLLJ). The bolstered GPLLJ transports oceanic moisture to the MW US, which concurrently receives Pacific Ocean moisture through geopotential height anomalies that create favorable conditions for MW precipitation and unfavorable conditions for SE precipitation. The northwest expansion of the NASH WR reduces ocean moisture to the SE US, resulting in light precipitation events. Heavier SE US precipitation events occur as the NASH WR recedes southeast of climatology, resulting in the redirection of moisture from the GPLLJ and MW to the SE. Simultaneously, geopotential height anomalies create unfavorable conditions for MW precipitation and favorable conditions for SE precipitation events. The geopotential height anomalies that affect MW and SE US precipitation events are approximately 12-day impressions of the Asia-North America teleconnection pattern that yields anomalous barotropic wave trains from East Asian Summer Monsoon latent heating anomalies.
■590 ▼aSchool code: 0176.
■650 4▼aPrecipitation
■650 4▼aDrought
■650 4▼aWind
■650 4▼aFloods
■650 4▼aSeasons
■650 4▼aWeather
■650 4▼aRegions
■650 4▼aHydrology
■650 4▼aEigenvalues
■650 4▼a21st century
■650 4▼aStatistical significance
■650 4▼aSampling error
■650 4▼aSummer
■650 4▼aClimate science
■650 4▼aClimate change
■650 4▼aGeneral circulation models
■650 4▼aStudent's t-test
■650 4▼aRain
■690 ▼a0404
■71020▼aThe Pennsylvania State University.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0176
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358659▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


