Atmospheric conditions during the spring and fall transitions in the coastal ocean off western United States

作者: P. Ted Strub , Corinne James

DOI: 10.1029/JC093IC12P15561

关键词: Wind stressGeologyTrough (meteorology)Sea levelSpatial ecologyClimatologyStormEmpirical orthogonal functionsOceanographySpring (hydrology)West coastEarth-Surface ProcessesEcology (disciplines)Earth and Planetary Sciences (miscellaneous)Space and Planetary SciencePalaeontologyForestryAquatic scienceAtmospheric ScienceSoil scienceGeochemistry and PetrologyGeophysicsWater Science and Technology

摘要: We examine large-scale atmospheric behavior around the time of spring and fall transitions in coastal ocean off west coast North America. Records adjusted sea level (ASL), wind stress, pressure (SLP), 500-mbar heights for years 1971–1975 1980–1983 are analyzed. The records cover periods 91 days, centered on dates as determined from data. Empirical orthogonal functions obtained ASL, SLP records. two dominant modes ASL stress similar times both transitions, series these highly correlated with one another. Transitionlike is evident first fall, but transition more pronounced. Principal estimator patterns, formed empirical show spatial patterns which force during transitions. pattern coincides formation a high-pressure system at 45°N 140°W along development low-pressure cell over southwest continental United States. Inspection height composites days surrounding 9 reveals ridging diffluent flow western States transition; following transition, relaxes continent remains duration 45 examined here. characterized by rise particularly north 40°N, change southward to northward stress. involves appearance America 50°N 140°W, representing passage synoptic storms through region. Prior somewhat trough southwestern States; after northeast Pacific nearly zonal.

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