Role of Ocean Dynamics in the Seasonal Hadley Cell: A Response to Idealized Arctic Amplification

Dai, Haijin; Yao, Qiang

doi:10.1007/s00376-022-2057-7

Cited by 2 publications

(4 citation statements)

References 32 publications

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“…This mechanism is also verified by numerical results (CTRL and 0.1 A experiments), which have been analyzed in summer, autumn and winter in previous studies (H. Dai, 2021;Dai & Yao, 2023;Dai et al, 2021Dai et al, , 2022. Climate anomalies in the Arctic region of the sensitivity experiment are comparable with those in the observation, although they are much larger in magnitude.…”

Section: Horizontal Temperature Advection and Synoptic Systemsupporting

confidence: 85%

Role of Horizontal Heat Advection in Arctic Surface Warming During Early Spring

Dai

2023

Geophysical Research Letters

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Reanalysis data and numerical model are employed to uncover the mechanisms of spring (March–April) Arctic surface warming. Different from other seasons, little additional solar radiation absorption or seasonal heat storage release contributes to Arctic surface warming in spring. Both observation and numerical results suggest that horizontal heat advection dominates Arctic surface air warming. However, horizontal advection originates from lower latitudes instead of local energy redistribution as in other seasons. Furthermore, Arctic warming weakens the meridional potential vorticity gradient, which strengthens the synoptic atmospheric blocking event. As a result, more warm (cold) air is transported to higher (lower) latitudes along the edge of high pressure, which is an accumulation of atmospheric blocking events. The results suggest that anomalous meridional heat transport plays more important roles in Arctic surface warming when the anomalous radiative forcing is weak. Without being absorbed by the ocean, additional available energy induces strong Arctic springtime surface warming.

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Section: Horizontal Temperature Advection and Synoptic Systemsupporting

confidence: 85%

Role of Horizontal Heat Advection in Arctic Surface Warming During Early Spring

Dai

2023

Geophysical Research Letters

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“…Nevertheless, meridional heat transport cannot increase this much, because the atmospheric circulation or temperature cannot increase by 10 times that in recent years. Instead, the AHT decreases because Hadley cell shrinks at lower latitudes (Dai & Yao, 2023). In this case, the surface energy budget anomaly over the Antarctic results from local forcing and feedback.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Most surface energy budget anomalies over the Antarctic, which are stored in the Southern Ocean, are considered to be the reason for recent Southern Ocean warming. However, a recent timescale analysis (Dai & Yao, 2023) suggested that the timescale of ocean temperature spin up in idealized numerical experiments (0.1A) is mainly determined by variations in northward meridional ocean heat transport, which is controlled by the strength of the Atlantic meridional overturning circulation. It would be interesting to find out how local surface forcing and ocean circulation adjustment compete or collaborate to reach equilibrium in the ocean temperature field in a future study.…”

Section: Journal Of Geophysical Research: Atmospheresmentioning

confidence: 99%

“…In the atmosphere, tropical warming (due to the positive phase of the IPO) leads to stronger vertical convection, which induces stationary Rossby waves (Eayrs et al., 2021), as well as stronger Hadley cell (Figure 2a, shading). On the other hand, the temperature gradient between the SH midlatitudes (less warming) and tropics (stronger warming) increases, leading to an increase in the width of the Hadley cell (Dai & Yao, 2023; Lu et al., 2007). A stronger subsidence branch also strengthens the Ferrel cell (Figure 2a, shading), and more energy is transported equatorward.…”

Section: Seasonal Surface Warming Over Antarctica Formulation and Var...mentioning

confidence: 99%

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Surface Albedo Feedback, Seasonal Heat Storage and Meridional Heat Transport Determine the Seasonality of Recent Warming in Antarctica

Dai

2024

JGR Atmospheres

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The reanalysis data suggest that recent surface warming over Antarctica start in 2016. In this study, using reanalysis data and numerical simulations, I attempt to determine the important mechanisms accounting for seasonal surface warming in Antarctica. The results suggested that seasonal surface warming in Antarctica is mainly determined by the surface energy budget over the Antarctic via horizontal heat advection. The surface energy budget anomaly over the Antarctic, which is mainly determined by anomalous solar radiation absorption, anomalous ocean heat content, and anomalous meridional atmospheric heat transport (AHT), is triggered by Antarctic sea‐ice loss and thus determines the observational seasonality of recent warming in Antarctica via surface horizontal heat advection. In austral summer (December–January–February), additional solar radiation absorption induced by sea‐ice loss and additional AHT from lower latitudes increase the energy budget over the Antarctic. Surface warming, more longwave radiation, and additional energy stored in the upper (deeper) ocean for short (long) time periods explain the additional energy sinks. During austral autumn‐winter (March–August), additional seasonal heat storage (SHS; mainly stored in the upper ocean) is released to the atmosphere and warms the surface. Although the AHT anomaly contributes similarly to the solar radiation absorption/SHS anomaly during April–August, the poleward AHT largely decreased in June due to the weaker eddy activity induced by strong warming at Southern Hemisphere midlatitudes, which counteracts the additional SHS release and cools the Antarctic(a).

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Role of Ocean Dynamics in the Seasonal Hadley Cell: A Response to Idealized Arctic Amplification

Cited by 2 publications

References 32 publications

Role of Horizontal Heat Advection in Arctic Surface Warming During Early Spring

Role of Horizontal Heat Advection in Arctic Surface Warming During Early Spring

Surface Albedo Feedback, Seasonal Heat Storage and Meridional Heat Transport Determine the Seasonality of Recent Warming in Antarctica

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