Hydro-climatic variability over the Andes of Colombia associated with ENSO: a review of climatic processes and their impact on one of the Earth’s most important biodiversity hotspots

Poveda, Germán; Álvarez, Diana Milena; Rueda, Oscar

doi:10.1007/s00382-010-0931-y

Cited by 217 publications

(208 citation statements)

References 74 publications

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“…On the other hand, the process variables (PRC and EVP) are the most complex in the region HPREC= 0.76 and HEVP= 0.71. This result confirms the diversity of factors that make part of the hydro-climatic variance at interannual timescale, thus reflecting the implicit complexity of the linkages between these two processes over TropSA [44,46,59,[70][71][72]. The high entropy of EVP can be also explained in terms of the multivariate influence of water and energy fluxes in TropSA [22,47,73].…”

Section: Svd Noise Reduction and Entropysupporting

confidence: 71%

<strong>New insights on land surface-atmosphere feedbacks over tropical South America at interannual timescales</strong>

Bedoya-Soto

Poveda

2017

Proceedings of First International Electronic Conference on the Hydrological Cycle

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Abstract:Using monthly data for the period 1979-2010, we study the dynamics and strength of land surface-atmosphere feedbacks (LAFs) among variables involved in the heat and moisture fluxes, at interannual timescales in Tropical South America (TropSA). The variables include precipitation, surface air temperature, specific humidity at 925 hPa, evaporation, and estimates of volumetric soil water content. We use a Maximum Covariance Analysis (MCA) to reduce the dimensionality and to rank the relative contributions to LAFs and group the time series into Maximum Covariance States (MCS) with common mechanisms among variables. We estimate linear (Pearson correlations) and non-linear association (information transfer or causality) metrics among pairs of variables to configure the structure of linkages. The main MCS associated with LAFs over TropSA are strongly influenced by ENSO, and the meridional and equatorial SSTs modes over the Atlantic and Indian Oceans. ENSO favors a unimodal behavior, with center of action in the Amazon River basin, while the SSTs mode over the Tropical North Atlantic (TNA) results in a dipole between northern and southern TropSA. Our results show that soil moisture plays a leading role in regulating heat and water anomalies, and provides the memory of the LAFs and their subsequent influence. Thus, volumetric soil water becomes a fundamental variable leading up to 9 month-lags. ENSO enhances the interannual connectivity and memory inside LAF mechanisms with respect to other modes. Within the identified multivariate structure, evaporation and soil moisture enhance the interannual connectivity of the whole set of variables since both variables exhibit more frequent two-way feedbacks with the remaining variables.

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Section: Svd Noise Reduction and Entropysupporting

confidence: 71%

<strong>New insights on land surface-atmosphere feedbacks over tropical South America at interannual timescales</strong>

Bedoya-Soto

Poveda

2017

Proceedings of First International Electronic Conference on the Hydrological Cycle

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“…The discharge pattern of the Magdalena to the Mompós Depression is largely determined by the Inter Tropical Convergence Zone (ITCZ), which annually oscillates from the Equator to the northern Andes and back, resulting in two rainy seasons: April-May and September-November (Poveda et al, 2011). This weather pattern typically results in predictable bimodal discharge peaks in April-May and October-November (Poveda et al, 2001;Smith, 1986).…”

Section: System Descriptionmentioning

confidence: 99%

“…This weather pattern typically results in predictable bimodal discharge peaks in April-May and October-November (Poveda et al, 2001;Smith, 1986). The roles of topography, soil-atmosphere interactions, the Atlantic Ocean, and the Amazon also influence temporal and spatial rainfall patterns, resulting in the bimodal character not being equally strong across the basin (Poveda et al, 2011). The lower basin near the Caribbean coast -including the Mompós Depression -is often suggested to be unimodal in character, and the southeastern portion of the basin (approximately below 2 • N) is characterized by a distinct unimodal pattern, with a June-August wet season (IDEAM, 2014).…”

Section: System Descriptionmentioning

confidence: 99%

Basin-scale impacts of hydropower development on the Mompós Depression wetlands, Colombia

Angarita

Wickel

Sieber

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. A number of large hydropower dams are currently under development or in an advanced stage of planning in the Magdalena River basin, Colombia, spelling uncertainty for the Mompós Depression wetlands, one of the largest wetland systems in South America at 3400 km 2 . Annual large-scale inundation of floodplains and their associated wetlands regulates water, nutrient, and sediment cycles, which in turn sustain a wealth of ecological processes and ecosystem services, including critical food supplies. In this study, we implemented an integrated approach focused on key attributes of ecologically functional floodplains: (1) hydrologic connectivity between the river and the floodplain, and between upstream and downstream sections; (2) hydrologic variability patterns and their links to local and regional processes; and (3) the spatial scale required to sustain floodplain-associated processes and benefits, like migratory fish biodiversity. The implemented framework provides an explicit quantification of the nonlinear or direct response relationship of those considerations with hydropower development. The proposed framework was used to develop a comparative analysis of the potential effects of the hydropower expansion necessary to meet projected 2050 electricity requirements. As part of this study, we developed an enhancement of the Water Evaluation and Planning system (WEAP) that allows resolution of the floodplains water balance at a medium scale (∼ 1000 to 10 000 km 2 ) and evaluation of the potential impacts of upstream water management practices. In the case of the Mompós Depression wetlands, our results indicate that the potential additional impacts of new hydropower infrastructure with respect to baseline conditions can range up to one order of magnitude between scenarios that are comparable in terms of energy capacity. Fragmentation of connectivity corridors between lowland floodplains and upstream spawning habitats and reduction of sediment loads show the greatest impacts, with potential reductions of up to 97.6 and 80 %, respectively, from pre-dam conditions. In some development scenarios, the amount of water regulated and withheld by upstream infrastructure is of similar magnitude to existing fluxes involved in the episodic inundation of the floodplain during dry years and, thus, can also induce substantial changes in floodplain seasonal dynamics of average-to-dry years in some areas of the Mompós Depression.

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“…LXXVI, 279, pp. 557-578, julio-diciembre 2015ISSN: 0014-1496, eISSN: 1988 571 ÍNDICE ESTANDARIZADO DE PRECIPITACIÓN (SPI) PARA LA CARACTERIZACIÓN... asociar la serie trimestral las series del ONI con el SPI trimestral; el ONI es un índice que relaciona las temperaturas superficiales del Océano Pacifico en la región conocida como Niño 3-4, que es la que tiene mayor asociación con la climatología Colombiana, según estudios precedentes (Poveda et al, 2010;Mesa, 2008;Carvajal, 2004); las correlaciones significativas del ONI con el SPI, alcanzaron valores entre -0,28 y -0,40 en las estaciones; el signo negativo indica que la temperatura del Océano en ésta región del Pacífico es inversamente proporcional al valor del SPI. Similares resultados, se obtuvieron, correlacionando las series del MEI con el SPI, índice basado en 6 variables principales sobre el Océano Pacífico Tropical, que monitorean el comportamiento del ENOS; estas 6 variables son presión al nivel del océano, componentes zonales y meridionales del viento superficial, temperatura superficial del océano, temperatura del aire superficial, y la fracción total de nubosidad del cielo, (Wolter, 1987).…”

Section: Metodologíaunclassified

Índice estandarizado de precipitación (SPI) para la caracterización de sequías meteorológicas en la cuenca del río Dagua-Colombia

Cerón¹,

Escobar²,

Montoya³

2015

Estud. geogr.

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Índice estandarizado de precipitación (SPI) para la caracterización de sequías meteorológicas en la cuenca del río Dagua-Colombia 1 Standardized precipitation index (SPI) for meteorological drought characterization in the Dagua river basin-ColombiaWilmar Loaiza Cerón * , Yesid Carvajal Escobar ** y Olga Lucia Baquero Montoya *** INTRODUCCIÓNHistóricamente, la sequía ha sido uno de los «desastres» de origen hidrometeorológico que más afecta la actividad agrícola, el bienestar y la soberanía alimentaria de la sociedad. Las comunidades ancestrales adquirieron conciencia de los estrechos vínculos entre los cultivos y las condiciones meteorológi-cas; implementando medidas de adaptación para buscar cultivos alimentarios alternativos. Sin embargo, un solo año agrícola marcado por una intensa sequía se traducía en la reducción de la producción en las cosechas, que general-

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Hydro-climatic variability over the Andes of Colombia associated with ENSO: a review of climatic processes and their impact on one of the Earth’s most important biodiversity hotspots

Cited by 217 publications

References 74 publications

<strong>New insights on land surface-atmosphere feedbacks over tropical South America at interannual timescales</strong>

<strong>New insights on land surface-atmosphere feedbacks over tropical South America at interannual timescales</strong>

Basin-scale impacts of hydropower development on the Mompós Depression wetlands, Colombia

Índice estandarizado de precipitación (SPI) para la caracterización de sequías meteorológicas en la cuenca del río Dagua-Colombia

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