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An inner-shelf (IS) dye plume that formed following a 3.84-h early morning surfzone (SZ) dye release off of Imperial Beach, California, is analyzed with in situ and aerial remotely sensed observations. Midmorning, 5 h after release start, the IS plume extended 800 m offshore (or ~8Lsz, where Lsz is the surfzone width) and was surface intensified. Over the next ~2 h, the IS plume deformed (narrowed) cross-shore with the offshore front progressing onshore at ~5 cm/s, deepened by up to 3 m, and elongated alongshore at ~4.5 cm/s/km (at ~2.5Lsz). Coincident with IS plume deformation and deepening, IS isotherms also deepened, with relatively stable IS plume joint dye and temperature statistics. Offshore tracer transport and subsequent IS plume deformation and deepening likely resulted from two phases of the diurnal internal tide (DIT). During and after deformation, the IS plume did not reenter the warm surfzone, which potentially acted as a thermal barrier. High-frequency internal waves (HF IWs) propagated through the IS plume at ~9 cm/s and dissipated onshore of 4Lsz. Surface HF IW signal was elevated in the plume elongation region, suggesting a linkage between plume elongation and either the DIT or HF IW. This IS plume evolution differs from previous SZ tracer releases, highlighting the effects of release timing relative to the solar cycle or the internal tide. This work was funded under the CSIDE grant by the National Science Foundation (NSF OCE-1459389), and through the NSF Graduate Research Fellowship Program. Data were made available in part by SIO CDIP and the Tijuana River National Estuary Research Reserve and are available through the CSIDE web page (https://scripps.ucsd.edu/projects/cside/) or by contacting the corresponding author. The U.S. Navy provided access to Navy property for data collection. We thank Ken Melville, Luc Lenain, Nick Statom, and Stephen Holleman for acquisition and preliminary processing of MASS data. We thank YMCA: Camp Surf for providing a base of operations; the cities of Imperial Beach and Coronado, the U.S. Navy and CA State Parks for accommodating our research activities; and the numerous Imperial Beach lifeguards, UCSD/SIO students, and volunteers for efforts to keep beachgoers safe and monitor surfzone instrumentation. Research Data Curation Program, UC San Diego, La Jolla, 92093-0175 (https://lib.ucsd.edu/rdcp) Grimes, Derek J.; Feddersen, Falk; Giddings, Sarah N.; Pawlak, Eugene (2021). Data From: Cross-shore deformation of a surfzone-released dye plume by an internal tide on the inner shelf. In The Cross-Surfzone/Inner-shelf Dye Exchange (CSIDE) Study. UC San Diego Library Digital Collections. https://doi.org/10.6075/J0PZ590X
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