Assessing the diurnal evolution of surface radiation balance over the western region of Tropical Atlantic Ocean using <i>in situ</i> measurements carried out during the FluTuA Project

Bacellar, Sarasvati; Oliveira, Amauri Pereira de; Soares, Jacyra Ramos; Servain, Jacques

doi:10.1002/met.111

Cited by 3 publications

(1 citation statement)

References 28 publications

(37 reference statements)

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“…The sky conditions can be classified into three categories according to the values of the atmospheric transmittance, β, that is, clear, mixed, and cloudy skies, and sky conditions of the same category have similar features (Li & Lam, 2001). Combined with previous studies (e.g., Bacellar et al, 2009;Sinnett & Feddersen, 2016), the skies are defined as clear skies when β ≥ 0.55, cloudy skies when β < 0.25, and mixed skies (or partly cloudy skies) when 0.25 ≤ β < 0.55. The valid data indicated that our valid observations were composed of 52% clear skies, 33% mixed skies, and 15% cloudy skies.…”

Section: Journal Of Geophysical Research: Oceansmentioning

confidence: 96%

Observation and Parameterization of Broadband Sea Surface Albedo

et al. 2019

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The broadband sea surface albedo (SSA) was observed from a fixed sea platform in the South China Sea. This observation period lasted approximately 152 days and included a wide range of atmospheric and oceanic conditions. Under clear‐sky conditions, the observed SSA increased significantly with the increase in the solar zenith angle at low solar altitudes, while the SSA changed little under high Sun. Under cloudy skies, however, the SSA was negligibly dependent on the solar zenith angle. The observed SSA was also influenced by atmospheric and oceanic conditions, in which it increased with increasing winds or surface waves and decreased with increasing water vapor pressure at the sea surface. An empirical parameterization of the broadband SSA was proposed based on these observations, in which the SSA was a function of the solar zenith angle, wind speed or significant wave height, and water vapor pressure. The correlation coefficients between the predicted SSA and the observations reached 0.95, 0.94, and 0.88 in clear skies, mixed skies, and cloudy skies, respectively. Finally, the root‐mean‐square deviations were only 0.009, 0.015, and 0.011 in these three sky conditions, respectively.

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Section: Journal Of Geophysical Research: Oceansmentioning

confidence: 96%

Observation and Parameterization of Broadband Sea Surface Albedo

et al. 2019

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An effective parameterization of broadband ocean surface albedo applicable to all skies

Huang,

Wang,

Chen

et al. 2024

Ocean Modelling

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Restratification of the Upper Ocean after the Passage of a Tropical Cyclone: A Numerical Study

Mei

Pasquero

2012

Journal of Physical Oceanography

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The role of baroclinic instability in the restratification of the upper ocean after the passage of a tropical cyclone (TC) is determined by means of numerical simulations. Using a regional ocean model, the Regional Ocean Modeling System (ROMS), a high-resolution three-dimensional simulation that includes the process of baroclinic instability and is initialized with moderate-amplitude eddy structures reproduces the satellite-observed decay rate of the TC-induced sea surface temperature (SST) anomaly and is also in qualitative agreement with published observations after the passage of Hurricane Fabian in 2003 that showed decaying cold and warm anomalies located in the climatological mixed layer (CML) and upper thermocline, respectively. The model ocean is restratified after approximately one month with a net heat gain in the water column due to anomalous air–sea heat fluxes. The model shows, however, that vertical heat fluxes associated with baroclinic instability dominate over air–sea heat fluxes in restoring the CML heat content during the first month. A comparison with two-dimensional simulations that exclude baroclinic adjustment further highlights the importance of baroclinic instability: it can not only input a considerable amount of heat into the CML, but also establish strong stratification there, inhibiting the downward penetration of heat contributed by diabatic heating at the surface; both effects hasten the recovery of the SST. Additional experiments were performed to examine the sensitivity of the model results to changes in Newtonian cooling rate, changes in the magnitude of the eddy structures used to initialize the simulation, and changes in poststorm wind strength; the results indicate that, although some of them may have a significant effect on the recovery time of the SST, their influence on the contribution of baroclinic instability to the recovery of the CML heat content is modest. However, the contribution of baroclinic instability exhibits pronounced positive dependence on the depth of the mixing layer relative to the CML depth and the relative size of the area with unperturbed water. Its dependence on the shape of the spatial variation of the mixing depth is relatively weak but in a more complicated manner. These dependencies are consistent with those predicted by a simple front adjustment model, whereas the latter also suggest that the contribution of baroclinic instability is independent of the prestorm stratification below the CML. Overall, the idealized simulations in this study suggest that, for a typical situation in the real ocean, baroclinic instability can account for approximately 50% of the full recovery of the CML heat content, whereas under specific conditions the contribution can be significantly smaller. Those estimates provide a limit to the maximum net warming of the water column after the initial mixing event and thus have important implications regarding estimating the long-term effect of TCs on the upper-ocean heat budget.

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Assessing the diurnal evolution of surface radiation balance over the western region of Tropical Atlantic Ocean using in situ measurements carried out during the FluTuA Project

Cited by 3 publications

References 28 publications

Observation and Parameterization of Broadband Sea Surface Albedo

Observation and Parameterization of Broadband Sea Surface Albedo

An effective parameterization of broadband ocean surface albedo applicable to all skies

Restratification of the Upper Ocean after the Passage of a Tropical Cyclone: A Numerical Study

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