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The Role of Nearshore Air‐Sea Interactions for Landfalling Atmospheric Rivers on the U.S. West Coast
Author(s) -
Bartusek Samuel T.,
Seo Hyodae,
Ummenhofer Caroline C.,
Steffen John
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl091388
Subject(s) - environmental science , climatology , latent heat , sea surface temperature , oceanography , humidity , landfall , air temperature , flux (metallurgy) , sea breeze , forcing (mathematics) , atmospheric sciences , meteorology , geology , geography , tropical cyclone , materials science , metallurgy
Research on Atmospheric Rivers (ARs) has focused primarily on AR (thermo)dynamics and hydrological impacts over land. However, the evolution and potential role of nearshore air‐sea fluxes during landfalling ARs are not well documented. Here, we examine synoptic evolutions of nearshore latent heat flux (LHF) during strong late‐winter landfalling ARs (1979–2017) using 138 overshelf buoys along the U. S. west coast. Composite evolutions show that ARs typically receive upward (absolute) LHF from the coastal ocean. LHF is small during landfall due to weak air‐sea humidity gradients but is strongest (30–50 W/m 2 along the coast) 1–3 days before/after landfall. During El Niño winters, southern‐coastal LHF strengthens, coincident with stronger ARs. A decomposition of LHF reveals that sea surface temperature (SST) anomalies modulated by the El Niño Southern Oscillation dominate interannual LHF variations under ARs, suggesting a potential role for nearshore SST and LHF influencing the intensity of landfalling ARs.