Hydrologic Sensitivities and ENSO Variability Across Hydrological Regimes in Central Chile (28°–41°S)

Hernandez, Diego; Mendoza, Pablo; Boisier, Juan Pablo; Ricchetti, Franco

doi:10.1029/2021wr031860

Cited by 6 publications

(2 citation statements)

References 85 publications

(131 reference statements)

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“…This aligns with earlier findings of an increase in storm duration during El Niño, irrespective of frequency, as documented by Hernández et al. (2022).…”

Section: Discussionsupporting

confidence: 93%

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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“…This aligns with earlier findings of an increase in storm duration during El Niño, irrespective of frequency, as documented by Hernández et al. (2022).…”

Section: Discussionsupporting

confidence: 93%

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

Campos,

Rondanelli

2023

JGR Atmospheres

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“…Different from satellitebased climate products, ERA5-Land derives from data assimilation algorithms combining forecasts with available observations to estimate different climatic variables (Muñoz-Sabater, 2019). Previous studies have indicated that the gridded ERA5-Land reanalysis data set has better performance than satellite-based precipitation products Water Resources Research 10.1029/2024WR037339 HOU AND WEI in comparison with in situ data and representation of precipitation and evapotranspiration (ET) seasonality (Hernandez et al, 2022;Jiang et al, 2021;Tarek et al, 2020;Teo et al, 2022). Watershed-scale data were summarized as the average value of all grids based on watershed boundaries.…”

Section: Datamentioning

confidence: 99%

Forest Disturbance Thresholds and Cumulative Hydrological Impacts

Hou,

Wei

2024

Water Resources Research

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Forest disturbance threshold is defined as a critical disturbance level (e.g., % of forest cover change) in forested landscapes above which significant hydrological impacts are detected. Determining disturbance thresholds is critically important for supporting forest management to ensure the sustaining of ecological and hydrological functions. However, there are very few quantitative evaluations of forest disturbance thresholds globally. In this study, we applied a well‐tested methodology (the modified double mass curve) to derive the long‐term, continuous hydrological response curves and then to quantify forest disturbance thresholds on annual streamflow in 42 forested watersheds in British Columbia, Canada. The results show that forest disturbance thresholds for significant and cumulative hydrological impacts vary from 7% to 52% of cumulative equivalent clear‐cut area with an average of 17% or from 8% to 52% of disturbed area with an average of 19%. Climate (inter‐annual and intra‐annual) and watershed properties exert critical controls on forest disturbance thresholds. Watersheds with greater snowfall proportions (more annual precipitation falling as snow), more desynchronizations (temporal mismatching) of energy demand and water supply at the intra‐annual scale, less diverse ecosystems, and larger watershed sizes have lower forest disturbance thresholds. Given the present forest disturbance levels in the central interior of British Columbia, about half (53%) of the forested watersheds have already crossed the average disturbance threshold. These results highlight that watershed planning and management using forest disturbance thresholds must carefully consider local climate and watershed properties. The methodology can be effectively and robustly extended elsewhere around the globe.

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