An extraordinary dry season precipitation event in the subtropical Andes: Drivers, impacts and predictability

Valenzuela, Raúl A.; Garreaud, René D.; Vergara, Iván; Campos, Diego Antunes; Viale, Maximiliano; Rondanelli, Roberto

doi:10.1016/j.wace.2022.100472

Cited by 12 publications

(10 citation statements)

References 42 publications

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“…The cold air behind the surface front is a region of extremely dry air, also explaining the decrease of PW near the continent in the climatological sense. Some individual storms can even produce precipitation without the need for the atmospheric river to land over the continent, for instance, in the recent case of 2021, where most of the precipitation occurred after the IVT maximum near the coast, where water vapor previously transported by an atmospheric river was organized by convective instability due to a cut-off low (Valenzuela et al, 2022). Regarding the source of water vapor, Langhamer et al ( 2018) used a Lagrangian approach and found that the main source of moisture for precipitation in the Patagonia icefields is located along a diagonal parallel to the SPCZ.…”

Section: Discussionmentioning

confidence: 99%

ENSO‐Related Precipitation Variability in Central Chile: The Role of Large Scale Moisture Transport

Campos,

Rondanelli

2023

JGR Atmospheres

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Interannual variability of precipitation in Central Chile has long been associated with changes in the dry atmospheric dynamics of the Southern Pacific. This is due to the interaction between the extratropical storm track and the polar anticyclonic circulations established by the Pacific South American (PSA) teleconnection mode, which results from changes in tropical convection. Here, we show that an enhanced subtropical moisture transport during the warm ENSO phase leads to an increase in the frequency of atmospheric rivers, larger values of precipitable water, and heightened zonal integrated water vapor transport. This occurs in a region of the Southern Pacific situated between the tropical high and the subtropical low of the PSA mode. These increases in zonal water vapor transport result in greater precipitation and moister, long‐lived atmospheric rivers making landfall in Central Chile

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Section: Discussionmentioning

confidence: 99%

ENSO‐Related Precipitation Variability in Central Chile: The Role of Large Scale Moisture Transport

Campos,

Rondanelli

2023

JGR Atmospheres

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show abstract

“…Some individual storms can even produce precipitation without the need for the atmospheric river to land over the continent, for instance, in the recent case of 2021, where most of the precipitation occurred after the IVT maximum near the coast, where water vapor was organized by convective instability (Valenzuela et al, 2022). In many cases, water vapor is transported near the continent and further organized by a system that could be different from the original atmospheric river (a cut-off low, for example).…”

Section: Discussionmentioning

confidence: 99%

ENSO-related precipitation variability in Central Chile: the role of large scale moisture transport.

Campos

Rondanelli

2023

Preprint

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Interannual variability of precipitation in Central Chile has long been associated with changes in the Southern Pacific dry atmospheric dynamics, due to the interaction of the extratropical storm track with the polar anticyclonic circulations established by the Pacific South American (PSA) teleconnection mode, which results from changes in tropical convection. Here we show that subtropical moisture transport, enhanced during the warm ENSO phase, results in an increase in the frequency of atmospheric rivers, larger values of precipitable water, and enhanced zonal integrated water vapor transport in a region of the Southern Pacific in between the tropical high and the subtropical low of the PSA mode. These increases in zonal water vapor transport result in larger precipitation, and moister and longer-lived atmospheric rivers landfalling in Central Chile.

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“…The shift in latitude for this ARgenesis event to the climatological moisture for this AR is obvious, at about 15°equatorward. This event became remarkable when it flooded Central Chile during the dry season (Valenzuela et al, 2022). As it comes onshore in Chile, some moisture continues to be sourced (Fig.…”

Section: Moisture Fluxes From Further Upwind and Equatorward Not Dire...mentioning

confidence: 99%

Just how river-like are Atmospheric Rivers?

LeGrande,

Booth,

Naud

et al. 2024

Preprint

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An extraordinary dry season precipitation event in the subtropical Andes: Drivers, impacts and predictability

Cited by 12 publications

References 42 publications

ENSO‐Related Precipitation Variability in Central Chile: The Role of Large Scale Moisture Transport

ENSO‐Related Precipitation Variability in Central Chile: The Role of Large Scale Moisture Transport

ENSO-related precipitation variability in Central Chile: the role of large scale moisture transport.

Just how river-like are Atmospheric Rivers?

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