Chang Yun

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Chang
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Yun
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  • Dataset
    Long-term, quality-controlled observations of near-shore wind momentum and heat flux at the Martha’s Vineyard Coastal Observatory’s Air-Sea Interaction Tower
    (Woods Hole Oceanographic Institution, 2024-01-05) Chang, Yun ; Kirincich, Anthony R.
    Quality-controlled atmospheric and oceanic observations of the wind momentum flux and heat flux in the surface layer above the ocean are provided based on data collected at Martha’s Vineyard Coastal Observatory (MVCO). The main dataset consists of wind speed, momentum flux, and heat flux observations made in 16 years over a 20 year period at measurement heights of 20 m above mean sea level. Ancillary data for comparison with bulk formula such as coare 3.5 (Edson et al. (2013)) include air temperature, relative humidity, air pressure, ocean surface temperature, ocean current speed, and solar radia- tion. MVCO is composed of three main elements, an Air-Sea Interaction Tower (ASIT, 3 km south of Martha’s Vineyard in 17-m water; Figure 1a), a Meteorological Mast (Met, 4 km northeast of ASIT), and an 12-m underwater node (UN, 1.6 km northeast of ASIT in 12-m water). The majority of the observations were collected at ASIT, while the ancillary data are from a combination of ASIT, Met, and UN.
  • Dataset
    Long-term, quality-controlled observations of near-shore wind momentum and heat flux at the Martha’s Vineyard Coastal Observatory’s Air-Sea Interaction Tower
    (Woods Hole Oceanographic Institution, 2024-06-12) Chang, Yun ; Kirincich, Anthony R.
    Quality-controlled atmospheric and oceanic observations of the wind momentum flux and heat flux in the surface layer above the ocean are provided based on data collected at Martha’s Vineyard Coastal Observatory (MVCO). The main dataset consists of wind speed, momentum flux, and heat flux observations made in 16 years over a 20 year period at measurement heights of mainly 18.4 m above mean sea level, as well as wave characteristics observed over a 4 year period. Ancillary data for comparison with bulk formula such as coare 3.5 (Edson et al. (2013)) include air temperature, relative humidity, air pressure, ocean surface temperature, ocean current speed, and solar radia- tion. MVCO is composed of three main elements, an Air-Sea Interaction Tower (ASIT, 3 km south of Martha’s Vineyard in 17-m water; Figure 1a), a Meteorological Mast (Met, 4 km northeast of ASIT), and an 12-m underwater node (UN, 1.6 km northeast of ASIT in 12-m water). The majority of the observations were collected at ASIT, while the ancillary data are from a combination of ASIT, Met, and UN. This version replaces doi:10.26025/1912/67490
  • Article
    Characteristic scales during the onset of radiatively driven convection: Linear analysis and simulations
    (Cambridge University Press, 2023-10-16) Chang, Yun ; Scotti, Alberto
    This paper considers the initial stage of radiatively driven convection, when the perturbations from a quiescent but time-dependent background state are small. Radiation intensity is assumed to decay exponentially away from the surface, and we consider parameter regimes in which the depth of the water is greater than the decay scale of 𝑒 of the radiation intensity. Both time-independent and time-periodic radiation are considered. In both cases, the background temperature profile of the water column is time-dependent. A linear analysis of the system is performed based on these time-dependent profiles. We find that the perturbations grow in time according to exp[(𝜎(𝑡)𝑡)], where 𝜎(𝑡) is a time-dependent growth rate. An appropriately defined Reynolds number is the primary dimensionless number characterising the system, determining the wavelength, vertical structure and growth rate of the perturbations. Simulations using a Boussinesq model (the Stratified Ocean Model with Adaptive Refinement) confirm the linear analysis.