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Land and Ocean Contributions to United States Summertime Precipitation Variability
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
저자명  
Sala, Christopher M.
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  
General circulation models
일반주제명  
Student's t-test
일반주제명  
Rain
기타저자  
The Pennsylvania State University.
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI32148963
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■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.

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