Impacts of Convergence on Structure Functions from Surface Drifters in the Gulf of Mexico SCIE SCOPUS

Cited 19 time in WEB OF SCIENCE Cited 17 time in Scopus
Title
Impacts of Convergence on Structure Functions from Surface Drifters in the Gulf of Mexico
Author(s)
Pearson, Jenna; Fox-Kemper, Baylor; Barkan, Roy; Choi, Jun; Bracco, Annalisa; McWilliams, James C.
Alternative Author(s)
최준명
Publication Year
2019-03
Abstract
There are limitations in approximating Eulerian statistics from surface drifters, due to biases from surface convergences. By contrasting second- and third-order Eulerian and surface drifter structure functions obtained from a model of the Gulf of Mexico, the consequences of the semi-Lagrangian nature of observations during the summer Grand Lagrangian Deployment (GLAD) and winter Lagrangian Submesoscale Experiment (LASER) are estimated. By varying launch pattern and location, the robustness and sensitivity of these statistics are evaluated. Over scales less than 10 km, second-order structure functions of surface drifters consistently have shallower slopes (similar to r(2/3)) than Eulerian statistics (similar to r), suggesting that surface drifter structure functions differ systematically and do not reproduce the scalings of the Eulerian fields. Medians of Eulerian and cluster release second-order statistics are also significantly different across all scales. Synthetic cluster release statistics depend on launch location and weakly on launch pattern. The observations suggest little seasonal difference in the second-order statistics, but the LASER third-order structure function shows a sign change around 1 km, while GLAD and the synthetic cluster releases show a third-order structure function sign change around 10 km. Further, synthetic surface drifter cluster releases (and therefore likely the GLAD observations) show robust biases in the negative third-order structure functions, which may lead to significant overestimation of the spectral energy flux and underestimation of the transition scale to a forward energy cascade. The Helmholtz decomposition, and curl and divergence statistics, of Eulerian and cluster releases differ, particularly on scales less than 10 km, in agreement with observations of drifters preferentially sampling convergences in coherent structures.
ISSN
0022-3670
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38866
DOI
10.1175/JPO-D-18-0029.1
Bibliographic Citation
JOURNAL OF PHYSICAL OCEANOGRAPHY, v.49, no.3, pp.675 - 690, 2019
Publisher
AMER METEOROLOGICAL SOC
Subject
NORTHERN GULF; SUBMESOSCALE DYNAMICS; PART I; TURBULENCE; STATISTICS; DISPERSION; VELOCITY; ENERGY; CLIMATOLOGY; SPECTRUM
Keywords
Ocean; Seas/gulfs/bays; Energy transport; Statistics; Oceanic variability
Type
Article
Language
English
Document Type
Article
Publisher
AMER METEOROLOGICAL SOC
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