Spatio-temporal assessment of Gridded precipitation products across topographic and climatic gradients in Colombia

Valencia, Santiago; Marín, Diver E.; Gómez, Derly; Hoyos, Natalia; Salazar, Juan F.; Villegas, Juan

doi:10.1016/j.atmosres.2023.106643

Cited by 12 publications

(1 citation statement)

References 60 publications

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“…The convective scheme in ERA‐5 comes from the Integrated Forecast System (IFS) which allows convection at smaller scales than the cell. Some studies have verified precipitation from both ERA‐Interim and ERA‐5 in Colombia, including the CA region, and have found that it tends to be less accurate, particularly at higher elevations (Valencia et al., 2023). Besides acknowledging precipitation biases in ERA‐5, it is important to consider their potential impact on ρ C and ϵ C estimates.…”

Section: Datamentioning

confidence: 99%

Moisture Recycling in the Colombian Andes

Bedoya‐Soto,

Poveda

2024

Water Resources Research

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The Colombian Andes (CA) are located over the northwestern corner of tropical South America (NW‐TropSA), where land and atmosphere interchange moisture and energy in a complex way owing to the orographic influence on the recycling of moisture over land. We aim to understand where and when water vapor evaporated from land turns into rainfall through moisture recycling, using the Water Accounting Model‐2layers (WAM‐2), an offline model to track atmospheric moisture forced with data from ERA‐5 at its native 0.25° resolution during 1980–2020. We define the spatiotemporal distribution of sources (high evaporation recycle ratios, ϵC) and receptors (high precipitation recycle ratios, ρC) of continental moisture at diverse timescales, including monthly, seasonal, annual and interannual (ENSO). Referring to the regional runs of WAM‐2 over NW‐TropSA (4°S–12°N/80°W–66°W), at elevations above 1,000 m.a.s.l., the CA has a mean annual ρC of 11% (ranging 6%–16%) and a mean annual ϵC of 35% (ranging 27%–40%). Moisture recycling in the CA exhibits a strong annual cycle over the region. The seasonal dynamic of moisture recycling shows two clear‐cut sources of moisture: the eastern foothills of the Eastern and Central ranges of the CA. Both foothills are also regions of high rainfall, although moisture recycling mechanisms differ. Sources of continental moisture grow spatially during September‐October‐November and March‐April‐May. The seasonal availability of moisture recycled coincides with regions where orography interacts with low level jets sourcing humidity. At interannual timescales, sources and receptors of continental moisture in the CA are modulated by the extreme phases of ENSO.

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Section: Datamentioning

confidence: 99%

Moisture Recycling in the Colombian Andes

Bedoya‐Soto,

Poveda

2024

Water Resources Research

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Current Forest–Savanna Transition in Northern South America Departs from Typical Climatic Thresholds

Valencia,

Salazar,

Hoyos

et al. 2023

Ecosystems

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The forest–savanna transition is the most widespread ecotone in the tropics, with important ecological, climatic, and biogeochemical implications at local to global scales. However, the factors and mechanisms that control this transition vary among continents and regions. Here, we analyzed which factors best explain the transition in northern South America (Llanos ecoregion and northwestern Amazon), where common thresholds on typical environmental factors (for example, mean annual precipitation (MAP), wet season precipitation) fail to predict it. For instance, savannas in the Llanos occur at MAP levels (> 1500 mm) which are typical of forests in other tropical regions. We examined the transition’s climate features, soils, and disturbance (fire frequency) spaces using remotely sensed data. We used logistic generalized linear models to assess the effect of seasonal (season length) and intra-seasonal (daily precipitation frequency and intensity) precipitation metrics during the dry season, soil silt content, and fire frequency, on the transition using canopy cover, tree cover, and the maximum Plant Area Volume Density as vegetation structure descriptor variables. Fire frequency and precipitation frequency were the most important variables explaining the transition. Although most fires occur in savannas, we found that a significant percentage of savanna pixels (46%) had no fires. This study indicates that the transition should be characterized regionally in response to biogeographic differences (for example, climatic space) among regions and continents. Our results highlight the importance of fire frequency and intra-seasonal precipitation in determining the transition in northern South America. Furthermore, future studies should consider regional differences in the climatic space of forest and savanna to improve projections of global change impacts on these highly diverse ecosystems.

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Trend analysis of extreme rainfall indices from CHIRPS precipitation estimates over the Lake Tana sub-basin, Abbay Basin of Ethiopia

Mohammed

2024

Environ Monit Assess

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Spatio-temporal assessment of Gridded precipitation products across topographic and climatic gradients in Colombia

Cited by 12 publications

References 60 publications

Moisture Recycling in the Colombian Andes

Moisture Recycling in the Colombian Andes

Current Forest–Savanna Transition in Northern South America Departs from Typical Climatic Thresholds

Trend analysis of extreme rainfall indices from CHIRPS precipitation estimates over the Lake Tana sub-basin, Abbay Basin of Ethiopia

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